CVE-2021-47510 (GCVE-0-2021-47510)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2025-05-04 07:12
VLAI?
Title
btrfs: fix re-dirty process of tree-log nodes
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix re-dirty process of tree-log nodes There is a report of a transaction abort of -EAGAIN with the following script. #!/bin/sh for d in sda sdb; do mkfs.btrfs -d single -m single -f /dev/\${d} done mount /dev/sda /mnt/test mount /dev/sdb /mnt/scratch for dir in test scratch; do echo 3 >/proc/sys/vm/drop_caches fio --directory=/mnt/\${dir} --name=fio.\${dir} --rw=read --size=50G --bs=64m \ --numjobs=$(nproc) --time_based --ramp_time=5 --runtime=480 \ --group_reporting |& tee /dev/shm/fio.\${dir} echo 3 >/proc/sys/vm/drop_caches done for d in sda sdb; do umount /dev/\${d} done The stack trace is shown in below. [3310.967991] BTRFS: error (device sda) in btrfs_commit_transaction:2341: errno=-11 unknown (Error while writing out transaction) [3310.968060] BTRFS info (device sda): forced readonly [3310.968064] BTRFS warning (device sda): Skipping commit of aborted transaction. [3310.968065] ------------[ cut here ]------------ [3310.968066] BTRFS: Transaction aborted (error -11) [3310.968074] WARNING: CPU: 14 PID: 1684 at fs/btrfs/transaction.c:1946 btrfs_commit_transaction.cold+0x209/0x2c8 [3310.968131] CPU: 14 PID: 1684 Comm: fio Not tainted 5.14.10-300.fc35.x86_64 #1 [3310.968135] Hardware name: DIAWAY Tartu/Tartu, BIOS V2.01.B10 04/08/2021 [3310.968137] RIP: 0010:btrfs_commit_transaction.cold+0x209/0x2c8 [3310.968144] RSP: 0018:ffffb284ce393e10 EFLAGS: 00010282 [3310.968147] RAX: 0000000000000026 RBX: ffff973f147b0f60 RCX: 0000000000000027 [3310.968149] RDX: ffff974ecf098a08 RSI: 0000000000000001 RDI: ffff974ecf098a00 [3310.968150] RBP: ffff973f147b0f08 R08: 0000000000000000 R09: ffffb284ce393c48 [3310.968151] R10: ffffb284ce393c40 R11: ffffffff84f47468 R12: ffff973f101bfc00 [3310.968153] R13: ffff971f20cf2000 R14: 00000000fffffff5 R15: ffff973f147b0e58 [3310.968154] FS: 00007efe65468740(0000) GS:ffff974ecf080000(0000) knlGS:0000000000000000 [3310.968157] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [3310.968158] CR2: 000055691bcbe260 CR3: 000000105cfa4001 CR4: 0000000000770ee0 [3310.968160] PKRU: 55555554 [3310.968161] Call Trace: [3310.968167] ? dput+0xd4/0x300 [3310.968174] btrfs_sync_file+0x3f1/0x490 [3310.968180] __x64_sys_fsync+0x33/0x60 [3310.968185] do_syscall_64+0x3b/0x90 [3310.968190] entry_SYSCALL_64_after_hwframe+0x44/0xae [3310.968194] RIP: 0033:0x7efe6557329b [3310.968200] RSP: 002b:00007ffe0236ebc0 EFLAGS: 00000293 ORIG_RAX: 000000000000004a [3310.968203] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efe6557329b [3310.968204] RDX: 0000000000000000 RSI: 00007efe58d77010 RDI: 0000000000000006 [3310.968205] RBP: 0000000004000000 R08: 0000000000000000 R09: 00007efe58d77010 [3310.968207] R10: 0000000016cacc0c R11: 0000000000000293 R12: 00007efe5ce95980 [3310.968208] R13: 0000000000000000 R14: 00007efe6447c790 R15: 0000000c80000000 [3310.968212] ---[ end trace 1a346f4d3c0d96ba ]--- [3310.968214] BTRFS: error (device sda) in cleanup_transaction:1946: errno=-11 unknown The abort occurs because of a write hole while writing out freeing tree nodes of a tree-log tree. For zoned btrfs, we re-dirty a freed tree node to ensure btrfs can write the region and does not leave a hole on write on a zoned device. The current code fails to re-dirty a node when the tree-log tree's depth is greater or equal to 2. That leads to a transaction abort with -EAGAIN. Fix the issue by properly re-dirtying a node on walking up the tree.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d3575156f6623eecf086a20bcf99a63f1598109c , < 477675049ca803aa95ff77468ffbddd966b415b0 (git)
Affected: d3575156f6623eecf086a20bcf99a63f1598109c , < 84c25448929942edacba905cecc0474e91114e7a (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.8 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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do\\n          mkfs.btrfs -d single -m single -f /dev/\\\\${d}\\n  done\\n\\n  mount /dev/sda /mnt/test\\n  mount /dev/sdb /mnt/scratch\\n\\n  for dir in test scratch; do\\n          echo 3 \u003e/proc/sys/vm/drop_caches\\n          fio --directory=/mnt/\\\\${dir} --name=fio.\\\\${dir} --rw=read --size=50G --bs=64m \\\\\\n                  --numjobs=$(nproc) --time_based --ramp_time=5 --runtime=480 \\\\\\n                  --group_reporting |\u0026 tee /dev/shm/fio.\\\\${dir}\\n          echo 3 \u003e/proc/sys/vm/drop_caches\\n  done\\n\\n  for d in sda sdb; do\\n          umount /dev/\\\\${d}\\n  done\\n\\nThe stack trace is shown in below.\\n\\n  [3310.967991] BTRFS: error (device sda) in btrfs_commit_transaction:2341: errno=-11 unknown (Error while writing out transaction)\\n  [3310.968060] BTRFS info (device sda): forced readonly\\n  [3310.968064] BTRFS warning (device sda): Skipping commit of aborted transaction.\\n  [3310.968065] ------------[ cut here ]------------\\n  [3310.968066] BTRFS: Transaction aborted (error -11)\\n  [3310.968074] WARNING: CPU: 14 PID: 1684 at fs/btrfs/transaction.c:1946 btrfs_commit_transaction.cold+0x209/0x2c8\\n  [3310.968131] CPU: 14 PID: 1684 Comm: fio Not tainted 5.14.10-300.fc35.x86_64 #1\\n  [3310.968135] Hardware name: DIAWAY Tartu/Tartu, BIOS V2.01.B10 04/08/2021\\n  [3310.968137] RIP: 0010:btrfs_commit_transaction.cold+0x209/0x2c8\\n  [3310.968144] RSP: 0018:ffffb284ce393e10 EFLAGS: 00010282\\n  [3310.968147] RAX: 0000000000000026 RBX: ffff973f147b0f60 RCX: 0000000000000027\\n  [3310.968149] RDX: ffff974ecf098a08 RSI: 0000000000000001 RDI: ffff974ecf098a00\\n  [3310.968150] RBP: ffff973f147b0f08 R08: 0000000000000000 R09: ffffb284ce393c48\\n  [3310.968151] R10: ffffb284ce393c40 R11: ffffffff84f47468 R12: ffff973f101bfc00\\n  [3310.968153] R13: ffff971f20cf2000 R14: 00000000fffffff5 R15: ffff973f147b0e58\\n  [3310.968154] FS:  00007efe65468740(0000) GS:ffff974ecf080000(0000) knlGS:0000000000000000\\n  [3310.968157] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n  [3310.968158] CR2: 000055691bcbe260 CR3: 000000105cfa4001 CR4: 0000000000770ee0\\n  [3310.968160] PKRU: 55555554\\n  [3310.968161] Call Trace:\\n  [3310.968167]  ? dput+0xd4/0x300\\n  [3310.968174]  btrfs_sync_file+0x3f1/0x490\\n  [3310.968180]  __x64_sys_fsync+0x33/0x60\\n  [3310.968185]  do_syscall_64+0x3b/0x90\\n  [3310.968190]  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n  [3310.968194] RIP: 0033:0x7efe6557329b\\n  [3310.968200] RSP: 002b:00007ffe0236ebc0 EFLAGS: 00000293 ORIG_RAX: 000000000000004a\\n  [3310.968203] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efe6557329b\\n  [3310.968204] RDX: 0000000000000000 RSI: 00007efe58d77010 RDI: 0000000000000006\\n  [3310.968205] RBP: 0000000004000000 R08: 0000000000000000 R09: 00007efe58d77010\\n  [3310.968207] R10: 0000000016cacc0c R11: 0000000000000293 R12: 00007efe5ce95980\\n  [3310.968208] R13: 0000000000000000 R14: 00007efe6447c790 R15: 0000000c80000000\\n  [3310.968212] ---[ end trace 1a346f4d3c0d96ba ]---\\n  [3310.968214] BTRFS: error (device sda) in cleanup_transaction:1946: errno=-11 unknown\\n\\nThe abort occurs because of a write hole while writing out freeing tree\\nnodes of a tree-log tree. For zoned btrfs, we re-dirty a freed tree\\nnode to ensure btrfs can write the region and does not leave a hole on\\nwrite on a zoned device. The current code fails to re-dirty a node\\nwhen the tree-log tree\u0027s depth is greater or equal to 2. That leads to\\na transaction abort with -EAGAIN.\\n\\nFix the issue by properly re-dirtying a node on walking up the tree.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.8\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:12:34.135Z\"}}}",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.