| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix data races when accessing the reserved amount of block reserves\n\nAt space_info.c we have several places where we access the ->reserved\nfield of a block reserve without taking the block reserve's spinlock\nfirst, which makes KCSAN warn about a data race since that field is\nalways updated while holding the spinlock.\n\nThe reports from KCSAN are like the following:\n\n [117.193526] BUG: KCSAN: data-race in btrfs_block_rsv_release [btrfs] / need_preemptive_reclaim [btrfs]\n\n [117.195148] read to 0x000000017f587190 of 8 bytes by task 6303 on cpu 3:\n [117.195172] need_preemptive_reclaim+0x222/0x2f0 [btrfs]\n [117.195992] __reserve_bytes+0xbb0/0xdc8 [btrfs]\n [117.196807] btrfs_reserve_metadata_bytes+0x4c/0x120 [btrfs]\n [117.197620] btrfs_block_rsv_add+0x78/0xa8 [btrfs]\n [117.198434] btrfs_delayed_update_inode+0x154/0x368 [btrfs]\n [117.199300] btrfs_update_inode+0x108/0x1c8 [btrfs]\n [117.200122] btrfs_dirty_inode+0xb4/0x140 [btrfs]\n [117.200937] btrfs_update_time+0x8c/0xb0 [btrfs]\n [117.201754] touch_atime+0x16c/0x1e0\n [117.201789] filemap_read+0x674/0x728\n [117.201823] btrfs_file_read_iter+0xf8/0x410 [btrfs]\n [117.202653] vfs_read+0x2b6/0x498\n [117.203454] ksys_read+0xa2/0x150\n [117.203473] __s390x_sys_read+0x68/0x88\n [117.203495] do_syscall+0x1c6/0x210\n [117.203517] __do_syscall+0xc8/0xf0\n [117.203539] system_call+0x70/0x98\n\n [117.203579] write to 0x000000017f587190 of 8 bytes by task 11 on cpu 0:\n [117.203604] btrfs_block_rsv_release+0x2e8/0x578 [btrfs]\n [117.204432] btrfs_delayed_inode_release_metadata+0x7c/0x1d0 [btrfs]\n [117.205259] __btrfs_update_delayed_inode+0x37c/0x5e0 [btrfs]\n [117.206093] btrfs_async_run_delayed_root+0x356/0x498 [btrfs]\n [117.206917] btrfs_work_helper+0x160/0x7a0 [btrfs]\n [117.207738] process_one_work+0x3b6/0x838\n [117.207768] worker_thread+0x75e/0xb10\n [117.207797] kthread+0x21a/0x230\n [117.207830] __ret_from_fork+0x6c/0xb8\n [117.207861] ret_from_fork+0xa/0x30\n\nSo add a helper to get the reserved amount of a block reserve while\nholding the lock. The value may be not be up to date anymore when used by\nneed_preemptive_reclaim() and btrfs_preempt_reclaim_metadata_space(), but\nthat's ok since the worst it can do is cause more reclaim work do be done\nsooner rather than later. Reading the field while holding the lock instead\nof using the data_race() annotation is used in order to prevent load\ntearing." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/btrfs/block-rsv.h", |
| "fs/btrfs/space-info.c" |
| ], |
| "versions": [ |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "995e91c9556c", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "82220b1835ba", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "c44542093525", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f4", |
| "lessThan": "e06cc89475ed", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/btrfs/block-rsv.h", |
| "fs/btrfs/space-info.c" |
| ], |
| "versions": [ |
| { |
| "version": "6.1.83", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "custom" |
| }, |
| { |
| "version": "6.6.23", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "custom" |
| }, |
| { |
| "version": "6.7.11", |
| "lessThanOrEqual": "6.7.*", |
| "status": "unaffected", |
| "versionType": "custom" |
| }, |
| { |
| "version": "6.8", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/995e91c9556c8fc6028b474145a36e947d1eb6b6" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/82220b1835baaebf4ae2e490f56353a341a09bd2" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/c44542093525699a30c307dae1ea5a1b03b3302f" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/e06cc89475eddc1f3a7a4d471524256152c68166" |
| } |
| ], |
| "title": "btrfs: fix data races when accessing the reserved amount of block reserves", |
| "x_generator": { |
| "engine": "bippy-a5840b7849dd" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-26905", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
