In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix potential kernel bug due to lack of writeback flag waiting
Destructive writes to a block device on which nilfs2 is mounted can cause
a kernel bug in the folio/page writeback start routine or writeback end
routine (__folio_start_writeback in the log below):
kernel BUG at mm/page-writeback.c:3070!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
…
RIP: 0010:__folio_start_writeback+0xbaa/0x10e0
Code: 25 ff 0f 00 00 0f 84 18 01 00 00 e8 40 ca c6 ff e9 17 f6 ff ff
e8 36 ca c6 ff 4c 89 f7 48 c7 c6 80 c0 12 84 e8 e7 b3 0f 00 90 <0f>
0b e8 1f ca c6 ff 4c 89 f7 48 c7 c6 a0 c6 12 84 e8 d0 b3 0f 00
…
Call Trace:
<TASK>
nilfs_segctor_do_construct+0x4654/0x69d0 [nilfs2]
nilfs_segctor_construct+0x181/0x6b0 [nilfs2]
nilfs_segctor_thread+0x548/0x11c0 [nilfs2]
kthread+0x2f0/0x390
ret_from_fork+0x4b/0x80
ret_from_fork_asm+0x1a/0x30
</TASK>
This is because when the log writer starts a writeback for segment summary
blocks or a super root block that use the backing device’s page cache, it
does not wait for the ongoing folio/page writeback, resulting in an
inconsistent writeback state.
Fix this issue by waiting for ongoing writebacks when putting
folios/pages on the backing device into writeback state.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/nilfs2/segment.c"
],
"versions": [
{
"version": "9ff05123e3bf",
"lessThan": "95f6f81e50d8",
"status": "affected",
"versionType": "git"
},
{
"version": "9ff05123e3bf",
"lessThan": "a75b8f493dfc",
"status": "affected",
"versionType": "git"
},
{
"version": "9ff05123e3bf",
"lessThan": "0ecfe3a92869",
"status": "affected",
"versionType": "git"
},
{
"version": "9ff05123e3bf",
"lessThan": "33900d7eae61",
"status": "affected",
"versionType": "git"
},
{
"version": "9ff05123e3bf",
"lessThan": "271dcd977ccd",
"status": "affected",
"versionType": "git"
},
{
"version": "9ff05123e3bf",
"lessThan": "614d397be0cf",
"status": "affected",
"versionType": "git"
},
{
"version": "9ff05123e3bf",
"lessThan": "1f3bff69f121",
"status": "affected",
"versionType": "git"
},
{
"version": "9ff05123e3bf",
"lessThan": "a4ca369ca221",
"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/nilfs2/segment.c"
],
"versions": [
{
"version": "2.6.30",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.30",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.317",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.279",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.221",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.162",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.95",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.35",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9.5",
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/0ecfe3a92869a59668d27228dabbd7965e83567f
git.kernel.org/stable/c/1f3bff69f1214fe03a02bc650d5bbfaa6e65ae7d
git.kernel.org/stable/c/271dcd977ccda8c7a26e360425ae7b4db7d2ecc0
git.kernel.org/stable/c/33900d7eae616647e179eee1c66ebe654ee39627
git.kernel.org/stable/c/614d397be0cf43412b3f94a0f6460eddced8ce92
git.kernel.org/stable/c/95f6f81e50d858a7c9aa7c795ec14a0ac3819118
git.kernel.org/stable/c/a4ca369ca221bb7e06c725792ac107f0e48e82e7
git.kernel.org/stable/c/a75b8f493dfc48aa38c518430bd9e03b53bffebe