#include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*siz*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse <pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize <pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsizennblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsizennblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ {\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n{\nif (!mod->num_ei_funcs)\nreturn;\n\npopulate_error_injection_list(mod->ei_funcs,\nmod->ei_funcs + mod->num_ei_funcs, mod);\n}\n\nstatic void module_unload_ei_list(struct module *mod)\n{\nstruct ei_entry *ent, *n;\n\nif (!mod->num_ei_funcs)\nreturn;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry_safe(ent, n, &error_injection_list, list) {\nif (ent->priv == mod){\nlist_del_init(&ent->list);\nkfree(ent);\n}\n}\nmutex_unlock(&ei_mutex);\n}\n\nstatic int ei_module_callback(struct notifier_block *nb,\nunsigned long val, void *data)\n{\nstruct module *mod = data;\n\nif (val == MODULE_STATE_COMING)\nmodule_load_ei_list(mod);\nelse if (val == MODULE_STATE_GOING)\nmodule_unload_ei_list(mod);\n\nreturn NOTIFY_DONE;\n}\n\nstatic struct notifier_block ei_module_nb = {\n.notifier_call = ei_module_callback,\n.priority = 0\n};\n\nstatic __init int module_ei_init(void)\n{\nreturn register_module_notifier(&ei_module_nb);\n}\n#else /* !CONFIG_MODULES */\n#define module_ei_init() (0)\n#endif\n\nstatic void *ei_seq_start(struct seq_file *m, loff_t *pos)\n{\nmutex_lock(&ei_mutex);\nreturn seq_list_start(&error_injection_list, *pos);\n}\n\nstatic void ei_seq_stop(struct seq_file *m, void *v)\n{\nmutex_unlock(&ei_mutex);\n}\n\nstatic void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos)\n{\nreturn seq_list_next(v, &error_injection_list, pos);\n}\n\nstatic const char *error_type_string(int etype)\n{\nswitch (etype) {\ncase EI_ETYPE_NULL:\nreturn "NULL";\ncase EI_ETYPE_ERRNO:\nreturn "ERRNO";\ncase EI_ETYPE_ERRNO_NULL:\nreturn "ERRNO_NULL";\ncase EI_ETYPE_TRUE:\nreturn "TRUE";\ndefault:\nreturn "(unknown)";\n}\n}\n\nstatic int ei_seq_show(struct seq_file *m, void *v)\n{\nstruct ei_entry *ent = list_entry(v, struct ei_entry, list);\n\nseq_printf(m, "%ps\t%s\n", (void *)ent->start_addr,\nerror_type_string(ent->etype));\nreturn 0;\n}\n\nstatic const struct seq_operations ei_sops = {\n.start = ei_seq_start,\n.next = ei_seq_next,\n.stop = ei_seq_stop,\n.show = ei_seq_show,\n};\n\nDEFINE_SEQ_ATTRIBUTE(ei);\n\nstatic int __init ei_debugfs_init(void)\n{\nstruct dentry *dir, *file;\n\ndir = debugfs_create_dir("error_injection", NULL);\n\nfile = debugfs_create_file("list", 0444, dir, NULL, &ei_fops);\nif (!file) {\ndebugfs_remove(dir);\nreturn -ENOMEM;\n}\n\nreturn 0;\n}\n\nstatic int __init init_error_injection(void)\n{\npopulate_kernel_ei_list();\n\nif (!module_ei_init())\nei_debugfs_init();\n\nreturn 0;\n}\nlate_initcall(init_error_injection); nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),Gnnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocnnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocsmall_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n {\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n{\nif (!mod->num_ei_funcs)\nreturn;\n\npopulate_error_injection_list(mod->ei_funcs,\nmod->ei_funcs + mod->num_ei_funcs, mod);\n}\n\nstatic void module_unload_ei_list(struct module *mod)\n{\nstruct ei_entry *ent, *n;\n\nif (!mod->num_ei_funcs)\nreturn;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry_safe(ent, n, &error_injection_list, list) {\nif (ent->priv == mod){\nlist_del_init(&ent->list);\nkfree(ent);\n}\n}\nmutex_unlock(&ei_mutex);\n}\n\nstatic int ei_module_callback(struct notifier_block *nb,\nunsigned long val, void *data)\n{\nstruct module *mod = data;\n\nif (val == MODULE_STATE_COMING)\nmodule_load_ei_list(mod);\nelse if (val == MODULE_STATE_GOING)\nmodule_unload_ei_list(mod);\n\nreturn NOTIFY_DONE;\n}\n\nstatic struct notifier_block ei_module_nb = {\n.notifier_call = ei_module_callback,\n.priority = 0\n};\n\nstatic __init int module_ei_init(void)\n{\nreturn register_module_notifier(&ei_module_nb);\n}\n#else /* !CONFIG_MODULES */\n#define module_ei_init() (0)\n#endif\n\nstatic void *ei_seq_start(struct seq_file *m, loff_t *pos)\n{\nmutex_lock(&ei_mutex);\nreturn seq_list_start(&error_injection_list, *pos);\n}\n\nstatic void ei_seq_stop(struct seq_file *m, void *v)\n{\nmutex_unlock(&ei_mutex);\n}\n\nstatic void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos)\n{\nreturn seq_list_next(v, &error_injection_list, pos);\n}\n\nstatic const char *error_type_string(int etype)\n{\nswitch (etype) {\ncase EI_ETYPE_NULL:\nreturn "NULL";\ncase EI_ETYPE_ERRNO:\nreturn "ERRNO";\ncase EI_ETYPE_ERRNO_NULL:\nreturn "ERRNO_NULL";\ncase EI_ETYPE_TRUE:\nreturn "TRUE";\ndefault:\nreturn "(unknown)";\n}\n}\n\nstatic int ei_seq_show(struct seq_file *m, void *v)\n{\nstruct ei_entry *ent = list_entry(v, struct ei_entry, list);\n\nseq_printf(m, "%ps\t%s\n", (void *)ent->start_addr,\nerror_type_string(ent->etype));\nreturn 0;\n}\n\nstatic const struct seq_operations ei_sops = {\n.start = ei_seq_start,\n.next = ei_seq_next,\n.stop = ei_seq_stop,\n.show = ei_seq_show,\n};\n\nDEFINE_SEQ_ATTRIBUTE(ei);\n\nstatic int __init ei_debugfs_init(void)\n{\nstruct dentry *dir, *file;\n\ndir = debugfs_create_dir("error_injection", NULL);\n\nfile = debugfs_create_file("list", 0444, dir, NULL, &ei_fops);\nif (!file) {\ndebugfs_remove(dir);\nreturn -ENOMEM;\n}\n\nreturn 0;\n}\n\nstatic int __init init_error_injection(void)\n{\npopulate_kernel_ei_list();\n\nif (!module_ei_init())\nei_debugfs_init();\n\nreturn 0;\n}\nlate_initcall(init_error_injection); nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocnnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocsmall_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocsmall_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*siz*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse <pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize <pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsizennblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n {\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n{\nif (!mod->num_ei_funcs)\nreturn;\n\npopulate_error_injection_list(mod->ei_funcs,\nmod->ei_funcs + mod->num_ei_funcs, mod);\n}\n\nstatic void module_unload_ei_list(struct module *mod)\n{\nstruct ei_entry *ent, *n;\n\nif (!mod->num_ei_funcs)\nreturn;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry_safe(ent, n, &error_injection_list, list) {\nif (ent->priv == mod){\nlist_del_init(&ent->list);\nkfree(ent);\n}\n}\nmutex_unlock(&ei_mutex);\n}\n\nstatic int ei_module_callback(struct notifier_block *nb,\nunsigned long val, void *data)\n{\nstruct module *mod = data;\n\nif (val == MODULE_STATE_COMING)\nmodule_load_ei_list(mod);\nelse if (val == MODULE_STATE_GOING)\nmodule_unload_ei_list(mod);\n\nreturn NOTIFY_DONE;\n}\n\nstatic struct notifier_block ei_module_nb = {\n.notifier_call = ei_module_callback,\n.priority = 0\n};\n\nstatic __init int module_ei_init(void)\n{\nreturn register_module_notifier(&ei_module_nb);\n}\n#else /* !CONFIG_MODULES */\n#define module_ei_init() (0)\n#endif\n\nstatic void *ei_seq_start(struct seq_file *m, loff_t *pos)\n{\nmutex_lock(&ei_mutex);\nreturn seq_list_start(&error_injection_list, *pos);\n}\n\nstatic void ei_seq_stop(struct seq_file *m, void *v)\n{\nmutex_unlock(&ei_mutex);\n}\n\nstatic void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos)\n{\nreturn seq_list_next(v, &error_injection_list, pos);\n}\n\nstatic const char *error_type_string(int etype)\n{\nswitch (etype) {\ncase EI_ETYPE_NULL:\nreturn "NULL";\ncase EI_ETYPE_ERRNO:\nreturn "ERRNO";\ncase EI_ETYPE_ERRNO_NULL:\nreturn "ERRNO_NULL";\ncase EI_ETYPE_TRUE:\nreturn "TRUE";\ndefault:\nreturn "(unknown)";\n}\n}\n\nstatic int ei_seq_show(struct seq_file *m, void *v)\n{\nstruct ei_entry *ent = list_entry(v, struct ei_entry, list);\n\nseq_printf(m, "%ps\t%s\n", (void *)ent->start_addr,\nerror_type_string(ent->etype));\nreturn 0;\n}\n\nstatic const struct seq_operations ei_sops = {\n.start = ei_seq_start,\n.next = ei_seq_next,\n.stop = ei_seq_stop,\n.show = ei_seq_show,\n};\n\nDEFINE_SEQ_ATTRIBUTE(ei);\n\nstatic int __init ei_debugfs_init(void)\n{\nstruct dentry *dir, *file;\n\ndir = debugfs_create_dir("error_injection", NULL);\n\nfile = debugfs_create_file("list", 0444, dir, NULL, &ei_fops);\nif (!file) {\ndebugfs_remove(dir);\nreturn -ENOMEM;\n}\n\nreturn 0;\n}\n\nstatic int __init init_error_injection(void)\n{\npopulate_kernel_ei_list();\n\nif (!module_ei_init())\nei_debugfs_init();\n\nreturn 0;\n}\nlate_initcall(init_error_injection); nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsizennblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc {\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n{\nif (!mod->num_ei_funcs)\nreturn;\n\npopulate_error_injection_list(mod->ei_funcs,\nmod->ei_funcs + mod->num_ei_funcs, mod);\n}\n\nstatic void module_unload_ei_list(struct module *mod)\n{\nstruct ei_entry *ent, *n;\n\nif (!mod->num_ei_funcs)\nreturn;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry_safe(ent, n, &error_injection_list, list) {\nif (ent->priv == mod){\nlist_del_init(&ent->list);\nkfree(ent);\n}\n}\nmutex_unlock(&ei_mutex);\n}\n\nstatic int ei_module_callback(struct notifier_block *nb,\nunsigned long val, void *data)\n{\nstruct module *mod = data;\n\nif (val == MODULE_STATE_COMING)\nmodule_load_ei_list(mod);\nelse if (val == MODULE_STATE_GOING)\nmodule_unload_ei_list(mod);\n\nreturn NOTIFY_DONE;\n}\n\nstatic struct notifier_block ei_module_nb = {\n.notifier_call = ei_module_callback,\n.priority = 0\n};\n\nstatic __init int module_ei_init(void)\n{\nreturn register_module_notifier(&ei_module_nb);\n}\n#else /* !CONFIG_MODULES */\n#define module_ei_init() (0)\n#endif\n\nstatic void *ei_seq_start(struct seq_file *m, loff_t *pos)\n{\nmutex_lock(&ei_mutex);\nreturn seq_list_start(&error_injection_list, *pos);\n}\n\nstatic void ei_seq_stop(struct seq_file *m, void *v)\n{\nmutex_unlock(&ei_mutex);\n}\n\nstatic void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos)\n{\nreturn seq_list_next(v, &error_injection_list, pos);\n}\n\nstatic const char *error_type_string(int etype)\n{\nswitch (etype) {\ncase EI_ETYPE_NULL:\nreturn "NULL";\ncase EI_ETYPE_ERRNO:\nreturn "ERRNO";\ncase EI_ETYPE_ERRNO_NULL:\nreturn "ERRNO_NULL";\ncase EI_ETYPE_TRUE:\nreturn "TRUE";\ndefault:\nreturn "(unknown)";\n}\n}\n\nstatic int ei_seq_show(struct seq_file *m, void *v)\n{\nstruct ei_entry *ent = list_entry(v, struct ei_entry, list);\n\nseq_printf(m, "%ps\t%s\n", (void *)ent->start_addr,\nerror_type_string(ent->etype));\nreturn 0;\n}\n\nstatic const struct seq_operations ei_sops = {\n.start = ei_seq_start,\n.next = ei_seq_next,\n.stop = ei_seq_stop,\n.show = ei_seq_show,\n};\n\nDEFINE_SEQ_ATTRIBUTE(ei);\n\nstatic int __init ei_debugfs_init(void)\n{\nstruct dentry *dir, *file;\n\ndir = debugfs_create_dir("error_injection", NULL);\n\nfile = debugfs_create_file("list", 0444, dir, NULL, &ei_fops);\nif (!file) {\ndebugfs_remove(dir);\nreturn -ENOMEM;\n}\n\nreturn 0;\n}\n\nstatic int __init init_error_injection(void)\n{\npopulate_kernel_ei_list();\n\nif (!module_ei_init())\nei_debugfs_init();\n\nreturn 0;\n}\nlate_initcall(init_error_injection); nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),Gnnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocnnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocsmall_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocnnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocsmall_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ {\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n{\nif (!mod->num_ei_funcs)\nreturn;\n\npopulate_error_injection_list(mod->ei_funcs,\nmod->ei_funcs + mod->num_ei_funcs, mod);\n}\n\nstatic void module_unload_ei_list(struct module *mod)\n{\nstruct ei_entry *ent, *n;\n\nif (!mod->num_ei_funcs)\nreturn;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry_safe(ent, n, &error_injection_list, list) {\nif (ent->priv == mod){\nlist_del_init(&ent->list);\nkfree(ent);\n}\n}\nmutex_unlock(&ei_mutex);\n}\n\nstatic int ei_module_callback(struct notifier_block *nb,\nunsigned long val, void *data)\n{\nstruct module *mod = data;\n\nif (val == MODULE_STATE_COMING)\nmodule_load_ei_list(mod);\nelse if (val == MODULE_STATE_GOING)\nmodule_unload_ei_list(mod);\n\nreturn NOTIFY_DONE;\n}\n\nstatic struct notifier_block ei_module_nb = {\n.notifier_call = ei_module_callback,\n.priority = 0\n};\n\nstatic __init int module_ei_init(void)\n{\nreturn register_module_notifier(&ei_module_nb);\n}\n#else /* !CONFIG_MODULES */\n#define module_ei_init() (0)\n#endif\n\nstatic void *ei_seq_start(struct seq_file *m, loff_t *pos)\n{\nmutex_lock(&ei_mutex);\nreturn seq_list_start(&error_injection_list, *pos);\n}\n\nstatic void ei_seq_stop(struct seq_file *m, void *v)\n{\nmutex_unlock(&ei_mutex);\n}\n\nstatic void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos)\n{\nreturn seq_list_next(v, &error_injection_list, pos);\n}\n\nstatic const char *error_type_string(int etype)\n{\nswitch (etype) {\ncase EI_ETYPE_NULL:\nreturn "NULL";\ncase EI_ETYPE_ERRNO:\nreturn "ERRNO";\ncase EI_ETYPE_ERRNO_NULL:\nreturn "ERRNO_NULL";\ncase EI_ETYPE_TRUE:\nreturn "TRUE";\ndefault:\nreturn "(unknown)";\n}\n}\n\nstatic int ei_seq_show(struct seq_file *m, void *v)\n{\nstruct ei_entry *ent = list_entry(v, struct ei_entry, list);\n\nseq_printf(m, "%ps\t%s\n", (void *)ent->start_addr,\nerror_type_string(ent->etype));\nreturn 0;\n}\n\nstatic const struct seq_operations ei_sops = {\n.start = ei_seq_start,\n.next = ei_seq_next,\n.stop = ei_seq_stop,\n.show = ei_seq_show,\n};\n\nDEFINE_SEQ_ATTRIBUTE(ei);\n\nstatic int __init ei_debugfs_init(void)\n{\nstruct dentry *dir, *file;\n\ndir = debugfs_create_dir("error_injection", NULL);\n\nfile = debugfs_create_file("list", 0444, dir, NULL, &ei_fops);\nif (!file) {\ndebugfs_remove(dir);\nreturn -ENOMEM;\n}\n\nreturn 0;\n}\n\nstatic int __init init_error_injection(void)\n{\npopulate_kernel_ei_list();\n\nif (!module_ei_init())\nei_debugfs_init();\n\nreturn 0;\n}\nlate_initcall(init_error_injection); #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocsmall_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*siz*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse <pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize <pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsizennblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCKnblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsizennblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ {\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n{\nif (!mod->num_ei_funcs)\nreturn;\n\npopulate_error_injection_list(mod->ei_funcs,\nmod->ei_funcs + mod->num_ei_funcs, mod);\n}\n\nstatic void module_unload_ei_list(struct module *mod)\n{\nstruct ei_entry *ent, *n;\n\nif (!mod->num_ei_funcs)\nreturn;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry_safe(ent, n, &error_injection_list, list) {\nif (ent->priv == mod){\nlist_del_init(&ent->list);\nkfree(ent);\n}\n}\nmutex_unlock(&ei_mutex);\n}\n\nstatic int ei_module_callback(struct notifier_block *nb,\nunsigned long val, void *data)\n{\nstruct module *mod = data;\n\nif (val == MODULE_STATE_COMING)\nmodule_load_ei_list(mod);\nelse if (val == MODULE_STATE_GOING)\nmodule_unload_ei_list(mod);\n\nreturn NOTIFY_DONE;\n}\n\nstatic struct notifier_block ei_module_nb = {\n.notifier_call = ei_module_callback,\n.priority = 0\n};\n\nstatic __init int module_ei_init(void)\n{\nreturn register_module_notifier(&ei_module_nb);\n}\n#else /* !CONFIG_MODULES */\n#define module_ei_init() (0)\n#endif\n\nstatic void *ei_seq_start(struct seq_file *m, loff_t *pos)\n{\nmutex_lock(&ei_mutex);\nreturn seq_list_start(&error_injection_list, *pos);\n}\n\nstatic void ei_seq_stop(struct seq_file *m, void *v)\n{\nmutex_unlock(&ei_mutex);\n}\n\nstatic void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos)\n{\nreturn seq_list_next(v, &error_injection_list, pos);\n}\n\nstatic const char *error_type_string(int etype)\n{\nswitch (etype) {\ncase EI_ETYPE_NULL:\nreturn "NULL";\ncase EI_ETYPE_ERRNO:\nreturn "ERRNO";\ncase EI_ETYPE_ERRNO_NULL:\nreturn "ERRNO_NULL";\ncase EI_ETYPE_TRUE:\nreturn "TRUE";\ndefault:\nreturn "(unknown)";\n}\n}\n\nstatic int ei_seq_show(struct seq_file *m, void *v)\n{\nstruct ei_entry *ent = list_entry(v, struct ei_entry, list);\n\nseq_printf(m, "%ps\t%s\n", (void *)ent->start_addr,\nerror_type_string(ent->etype));\nreturn 0;\n}\n\nstatic const struct seq_operations ei_sops = {\n.start = ei_seq_start,\n.next = ei_seq_next,\n.stop = ei_seq_stop,\n.show = ei_seq_show,\n};\n\nDEFINE_SEQ_ATTRIBUTE(ei);\n\nstatic int __init ei_debugfs_init(void)\n{\nstruct dentry *dir, *file;\n\ndir = debugfs_create_dir("error_injection", NULL);\n\nfile = debugfs_create_file("list", 0444, dir, NULL, &ei_fops);\nif (!file) {\ndebugfs_remove(dir);\nreturn -ENOMEM;\n}\n\nreturn 0;\n}\n\nstatic int __init init_error_injection(void)\n{\npopulate_kernel_ei_list();\n\nif (!module_ei_init())\nei_debugfs_init();\n\nreturn 0;\n}\nlate_initcall(init_error_injection); nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc {\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n{\nif (!mod->num_ei_funcs)\nreturn;\n\npopulate_error_injection_list(mod->ei_funcs,\nmod->ei_funcs + mod->num_ei_funcs, mod);\n}\n\nstatic void module_unload_ei_list(struct module *mod)\n{\nstruct ei_entry *ent, *n;\n\nif (!mod->num_ei_funcs)\nreturn;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry_safe(ent, n, &error_injection_list, list) {\nif (ent->priv == mod){\nlist_del_init(&ent->list);\nkfree(ent);\n}\n}\nmutex_unlock(&ei_mutex);\n}\n\nstatic int ei_module_callback(struct notifier_block *nb,\nunsigned long val, void *data)\n{\nstruct module *mod = data;\n\nif (val == MODULE_STATE_COMING)\nmodule_load_ei_list(mod);\nelse if (val == MODULE_STATE_GOING)\nmodule_unload_ei_list(mod);\n\nreturn NOTIFY_DONE;\n}\n\nstatic struct notifier_block ei_module_nb = {\n.notifier_call = ei_module_callback,\n.priority = 0\n};\n\nstatic __init int module_ei_init(void)\n{\nreturn register_module_notifier(&ei_module_nb);\n}\n#else /* !CONFIG_MODULES */\n#define module_ei_init() (0)\n#endif\n\nstatic void *ei_seq_start(struct seq_file *m, loff_t *pos)\n{\nmutex_lock(&ei_mutex);\nreturn seq_list_start(&error_injection_list, *pos);\n}\n\nstatic void ei_seq_stop(struct seq_file *m, void *v)\n{\nmutex_unlock(&ei_mutex);\n}\n\nstatic void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos)\n{\nreturn seq_list_next(v, &error_injection_list, pos);\n}\n\nstatic const char *error_type_string(int etype)\n{\nswitch (etype) {\ncase EI_ETYPE_NULL:\nreturn "NULL";\ncase EI_ETYPE_ERRNO:\nreturn "ERRNO";\ncase EI_ETYPE_ERRNO_NULL:\nreturn "ERRNO_NULL";\ncase EI_ETYPE_TRUE:\nreturn "TRUE";\ndefault:\nreturn "(unknown)";\n}\n}\n\nstatic int ei_seq_show(struct seq_file *m, void *v)\n{\nstruct ei_entry *ent = list_entry(v, struct ei_entry, list);\n\nseq_printf(m, "%ps\t%s\n", (void *)ent->start_addr,\nerror_type_string(ent->etype));\nreturn 0;\n}\n\nstatic const struct seq_operations ei_sops = {\n.start = ei_seq_start,\n.next = ei_seq_next,\n.stop = ei_seq_stop,\n.show = ei_seq_show,\n};\n\nDEFINE_SEQ_ATTRIBUTE(ei);\n\nstatic int __init ei_debugfs_init(void)\n{\nstruct dentry *dir, *file;\n\ndir = debugfs_create_dir("error_injection", NULL);\n\nfile = debugfs_create_file("list", 0444, dir, NULL, &ei_fops);\nif (!file) {\ndebugfs_remove(dir);\nreturn -ENOMEM;\n}\n\nreturn 0;\n}\n\nstatic int __init init_error_injection(void)\n{\npopulate_kernel_ei_list();\n\nif (!module_ei_init())\nei_debugfs_init();\n\nreturn 0;\n}\nlate_initcall(init_error_injection); #include <linux/error-injection.h>\n#include <linux/debugfs.h>\n#include>#include <linux/kallsyms.h>\n#include <linux/kprobes.h>\n#include <linux/module.h>\n#include <linux/mutex.h>\n#include <linux/list.h>\n#include <linux/slab.h>\n#include <asm/sections.h>\n\nstatic LIST_HEAD(error_injection_list);\nstatic DEFINE_MUTEX(ei_mutex);\nstruct ei_entry {\nstruct list_head list;\nunsigned long start_addr;\nunsigned long end_addr;\nint etype;\nvoid *priv;\n};\n\nbool within_error_injection_list(unsigned long addr)\n{\nstruct ei_entry *ent;\nbool ret = false;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nret = true;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\nreturn ret;\n}\n\nint get_injectable_error_type(unsigned long addr)\n{\nstruct ei_entry *ent;\nint ei_type = -EINVAL;\n\nmutex_lock(&ei_mutex);\nlist_for_each_entry(ent, &error_injection_list, list) {\nif (addr >= ent->start_addr && addr < ent->end_addr) {\nei_type = ent->etype;\nbreak;\n}\n}\nmutex_unlock(&ei_mutex);\n\nreturn ei_type;\n}\n\nstatic voidpopulate_error_injection_list(struct error_injection_entry*start,\nstruct error_injection_entry*end,\nvoid *priv)\n{\nstruct error_injection_entry *iter;\nstruct ei_entry *ent;\nunsigned long entry, offset = 0, size = 0;\n\nmutex_lock(&ei_mutex);\nfor (iter = start; iter < end; iter++) {\nentry = (unsigned long)dereference_symbol_descriptor((void *)iter->addr);\n\nif (!kernel_text_address(entry) ||\n!kallsyms_lookup_size_offset(entry, &size, &offset)) {\npr_err("%p\n",\n(void *)entry);\ncontinue;\n}\n\nent = kmalloc(sizeof(*ent), GFP_KERNEL);\nif (!ent)\nbreak;\nent->start_addr = entry;\nent->end_addr = entry + size;\nent->etype = iter->etype;\nent->priv = priv;\nINIT_LIST_HEAD(&ent->list);\nlist_add_tail(&ent->list, &error_injection_list);\n}\nmutex_unlock(&ei_mutex);\n}\n\nextern struct error_injection_entry__start_error_injection_whitelist[];\nextern struct error_injection_entry__stop_error_injection_whitelist[];\n\nstatic void __init populate_kernel_ei_list(void)\n{\npopulate_error_injection_list(__start_error_injection_whitelist,\n__stop_error_injection_whitelist,\nNULL);\n}\n\n#ifdef CONFIG_MODULES\nstatic void module_load_ei_list(struct module *mod)\n nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_undo_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_undo_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocnnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmallocsmall_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_ >/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/ngotoout_partial_alloc;/ngroup_info->blocks[i]=b;/n}/n}/nreturngroup_info;/n/n/nout_partial_alloc:/n/nwhile(--i>=0){/n/nfree_page((unsignedlong)group_info->blocks[i]);/n/n}/n/nkfree(group_info);/n/nreturnNULL;/n/n}/n/n/n/nEXPORT_SYMBOL(groups_alloc);/n/n/n/nvoidgroups_free(structgroup_info*group_info)/n/n{/n/nif(group_info->blocks[0]!=group_info->small_block){/n/ninti;/n/nfor(i=0;i<group_info->nblocks;i++)/n/n/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),GFP_USER);/nif(!group_info)/nreturnNULL;/n/ngroup_info->ngroups=gidsetsize;/ngroup_info->nblocks=nblocks;/natomic_set(&group_info->usage,1);/n/nif(gidsetsize<=NGROUPS_SMALL)/ngroup_info->blocks[0]=group_info->;small_block;/nelse{/nfor(i=0;i<nblocks;i++){/ngid_t*b;/nb=(void*)__get_free_page(GFP_USER);/nif(!b)/<pclass="text"data-text="/nstructgroup_infoinit_groups={.usage=ATOMIC_INIT(2)};/n/nstructgroup_info*groups_alloc(intgidsetsize){/nstructgroup_info*group_info;/nintnblocks;/ninti;/n/n/nnblocks=(gidsetsize+NGROUPS_PER_BLOCK-1)>/NGROUPS_PER_BLOCK;/n/*Makesurewealwaysallocateatleastoneindirectblockpointer*//nnblocks=nblocks?:1;/ngroup_info=kmalloc(sizeof(*group_info)+nblocks*sizeof(gid_t*),G