| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: shmem: fix data-race in shmem_getattr()\n\nI got the following KCSAN report during syzbot testing:\n\n==================================================================\nBUG: KCSAN: data-race in generic_fillattr / inode_set_ctime_current\n\nwrite to 0xffff888102eb3260 of 4 bytes by task 6565 on cpu 1:\n inode_set_ctime_to_ts include/linux/fs.h:1638 [inline]\n inode_set_ctime_current+0x169/0x1d0 fs/inode.c:2626\n shmem_mknod+0x117/0x180 mm/shmem.c:3443\n shmem_create+0x34/0x40 mm/shmem.c:3497\n lookup_open fs/namei.c:3578 [inline]\n open_last_lookups fs/namei.c:3647 [inline]\n path_openat+0xdbc/0x1f00 fs/namei.c:3883\n do_filp_open+0xf7/0x200 fs/namei.c:3913\n do_sys_openat2+0xab/0x120 fs/open.c:1416\n do_sys_open fs/open.c:1431 [inline]\n __do_sys_openat fs/open.c:1447 [inline]\n __se_sys_openat fs/open.c:1442 [inline]\n __x64_sys_openat+0xf3/0x120 fs/open.c:1442\n x64_sys_call+0x1025/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:258\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x54/0x120 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nread to 0xffff888102eb3260 of 4 bytes by task 3498 on cpu 0:\n inode_get_ctime_nsec include/linux/fs.h:1623 [inline]\n inode_get_ctime include/linux/fs.h:1629 [inline]\n generic_fillattr+0x1dd/0x2f0 fs/stat.c:62\n shmem_getattr+0x17b/0x200 mm/shmem.c:1157\n vfs_getattr_nosec fs/stat.c:166 [inline]\n vfs_getattr+0x19b/0x1e0 fs/stat.c:207\n vfs_statx_path fs/stat.c:251 [inline]\n vfs_statx+0x134/0x2f0 fs/stat.c:315\n vfs_fstatat+0xec/0x110 fs/stat.c:341\n __do_sys_newfstatat fs/stat.c:505 [inline]\n __se_sys_newfstatat+0x58/0x260 fs/stat.c:499\n __x64_sys_newfstatat+0x55/0x70 fs/stat.c:499\n x64_sys_call+0x141f/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:263\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x54/0x120 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nvalue changed: 0x2755ae53 -> 0x27ee44d3\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 0 UID: 0 PID: 3498 Comm: udevd Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a-dirty #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\n==================================================================\n\nWhen calling generic_fillattr(), if you don't hold read lock, data-race\nwill occur in inode member variables, which can cause unexpected\nbehavior.\n\nSince there is no special protection when shmem_getattr() calls\ngeneric_fillattr(), data-race occurs by functions such as shmem_unlink()\nor shmem_mknod(). This can cause unexpected results, so commenting it out\nis not enough.\n\nTherefore, when calling generic_fillattr() from shmem_getattr(), it is\nappropriate to protect the inode using inode_lock_shared() and\ninode_unlock_shared() to prevent data-race." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "mm/shmem.c" |
| ], |
| "versions": [ |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "9fb9703cd43e", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "7cc30ada8432", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "bda1a99a0dd6", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "3d9528484480", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "82cae1e30bd9", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "edd1f9050506", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "ffd56612566b", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "44a30220bc0a", |
| "lessThan": "d949d1d14fa2", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "mm/shmem.c" |
| ], |
| "versions": [ |
| { |
| "version": "4.3", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "4.3", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.19.323", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.285", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.229", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.171", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.116", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.60", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.11.7", |
| "lessThanOrEqual": "6.11.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/9fb9703cd43ee20a6de8ccdef991677b7274cec0" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/7cc30ada84323be19395094d567579536e0d187e" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/bda1a99a0dd644f31a87d636ac624eeb975cb65a" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/3d9528484480e8f4979b3a347930ed383be99f89" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/82cae1e30bd940253593c2d4f16d88343d1358f4" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/edd1f905050686fdc4cfe233d818469fdf7d5ff8" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/ffd56612566bc23877c8f45def2801f3324a222a" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/d949d1d14fa281ace388b1de978e8f2cd52875cf" |
| } |
| ], |
| "title": "mm: shmem: fix data-race in shmem_getattr()", |
| "x_generator": { |
| "engine": "bippy-8e903de6a542" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-50228", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
