CVE-2021-47145: btrfs: do not BUG_ON in link_to_fixup_dir
First published: Mon Mar 25 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not BUG_ON in link_to_fixup_dir While doing error injection testing I got the following panic kernel BUG at fs/btrfs/tree-log.c:1862! invalid opcode: 0000 [#1] SMP NOPTI CPU: 1 PID: 7836 Comm: mount Not tainted 5.13.0-rc1+ #305 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014 RIP: 0010:link_to_fixup_dir+0xd5/0xe0 RSP: 0018:ffffb5800180fa30 EFLAGS: 00010216 RAX: fffffffffffffffb RBX: 00000000fffffffb RCX: ffff8f595287faf0 RDX: ffffb5800180fa37 RSI: ffff8f5954978800 RDI: 0000000000000000 RBP: ffff8f5953af9450 R08: 0000000000000019 R09: 0000000000000001 R10: 000151f408682970 R11: 0000000120021001 R12: ffff8f5954978800 R13: ffff8f595287faf0 R14: ffff8f5953c77dd0 R15: 0000000000000065 FS: 00007fc5284c8c40(0000) GS:ffff8f59bbd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc5287f47c0 CR3: 000000011275e002 CR4: 0000000000370ee0 Call Trace: replay_one_buffer+0x409/0x470 ? btree_read_extent_buffer_pages+0xd0/0x110 walk_up_log_tree+0x157/0x1e0 walk_log_tree+0xa6/0x1d0 btrfs_recover_log_trees+0x1da/0x360 ? replay_one_extent+0x7b0/0x7b0 open_ctree+0x1486/0x1720 btrfs_mount_root.cold+0x12/0xea ? __kmalloc_track_caller+0x12f/0x240 legacy_get_tree+0x24/0x40 vfs_get_tree+0x22/0xb0 vfs_kern_mount.part.0+0x71/0xb0 btrfs_mount+0x10d/0x380 ? vfs_parse_fs_string+0x4d/0x90 legacy_get_tree+0x24/0x40 vfs_get_tree+0x22/0xb0 path_mount+0x433/0xa10 __x64_sys_mount+0xe3/0x120 do_syscall_64+0x3d/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae We can get -EIO or any number of legitimate errors from btrfs_search_slot(), panicing here is not the appropriate response. The error path for this code handles errors properly, simply return the error.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <4.4.271 | |
| Linux Linux kernel | >=4.5<4.9.271 | |
| Linux Linux kernel | >=4.10<4.14.235 | |
| Linux Linux kernel | >=4.15<4.19.193 | |
| Linux Linux kernel | >=4.20<5.4.124 | |
| Linux Linux kernel | >=5.5<5.10.42 | |
| Linux Linux kernel | >=5.11<5.12.9 | |
| Linux Linux kernel | =5.13-rc1 | |
| Linux Linux kernel | =5.13-rc2 |
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Reference Links
- https://git.kernel.org/stable/c/76bfd8ac20bebeae599452a03dfc5724c0475dcf
- https://git.kernel.org/stable/c/e934c4ee17b33bafb0444f2f9766cda7166d3c40
- https://git.kernel.org/stable/c/0eaf383c6a4a83c09f60fd07a1bea9f1a9181611
- https://git.kernel.org/stable/c/6eccfb28f8dca70c9b1b3bb3194ca54cbe73a9fa
- https://git.kernel.org/stable/c/0ed102453aa1cd12fefde8f6b60b9519b0b1f003
- https://git.kernel.org/stable/c/7e13db503918820e6333811cdc6f151dcea5090a
- https://git.kernel.org/stable/c/b545442133580dcb2f2496133bf850824d41255c
- https://git.kernel.org/stable/c/91df99a6eb50d5a1bc70fff4a09a0b7ae6aab96d
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