In the Linux kernel, the following vulnerability has been resolved:
btrfs: prevent copying too big compressed lzo segment
Compressed length can be corrupted to be a lot larger than memory
we have allocated for buffer.
This will cause memcpy in copy_compressed_segment to write outside
of allocated memory.
This mostly results in stuck read syscall but sometimes when using
btrfs send can get #GP
0:* 48 8b 06 mov (%rsi),%rax <-- trapping instruction
3: 48 8d 79 08 lea 0x8(%rcx),%rdi
7: 48 83 e7 f8 and $0xfffffffffffffff8,%rdi
b: 48 89 01 mov %rax,(%rcx)
e: 44 89 f0 mov %r14d,%eax
11: 48 8b 54 06 f8 mov -0x8(%rsi,%rax,1),%rdx
kernel: RSP: 0018:ffffb110812efd50 EFLAGS: 00010212
kernel: RAX: 0000000000001000 RBX: 000000009ca264c8 RCX: ffff98996e6d8ff8
kernel: RDX: 0000000000000064 RSI: 000841551d5c1000 RDI: ffffffff9500435d
kernel: RBP: ffff989a3be856c0 R08: 0000000000000000 R09: 0000000000000000
kernel: R10: 0000000000000000 R11: 0000000000001000 R12: ffff98996e6d8000
kernel: R13: 0000000000000008 R14: 0000000000001000 R15: 000841551d5c1000
kernel: FS: 0000000000000000(0000) GS:ffff98a09d640000(0000) knlGS:0000000000000000
kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 00001e9f984d9ea8 CR3: 000000014971a000 CR4: 00000000003506e0
kernel: Call Trace:
kernel: <TASK>
kernel: end_compressed_bio_read (fs/btrfs/compression.c:104 fs/btrfs/compression.c:1363 fs/btrfs/compression.c:323) btrfs
kernel: end_workqueue_fn (fs/btrfs/disk-io.c:1923) btrfs
kernel: btrfs_work_helper (fs/btrfs/async-thread.c:326) btrfs
kernel: process_one_work (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:212 ./include/trace/events/workqueue.h:108 kernel/workqueue.c:2312)
kernel: worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2455)
kernel: ? process_one_work (kernel/workqueue.c:2397)
kernel: kthread (kernel/kthread.c:377)
kernel: ? kthread_complete_and_exit (kernel/kthread.c:332)
kernel: ret_from_fork (arch/x86/entry/entry_64.S:301)
kernel: </TASK>
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/btrfs/lzo.c"
],
"versions": [
{
"version": "1da177e4c3f4",
"lessThan": "8df508b7a44c",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "e326bd06cdde",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "741b23a970a7",
"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/lzo.c"
],
"versions": [
{
"version": "5.15.26",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.16.12",
"lessThanOrEqual": "5.16.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]