CVE-2021-47117

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47117
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47117.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47117
Related
Published
2024-03-15T21:15:06Z
Modified
2024-09-18T01:00:21Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix bug on in ext4escacheextent as ext4splitextentat failed

We got follow bugon when run fsstress with injecting IO fault: [130747.323114] kernel BUG at fs/ext4/extentsstatus.c:762! [130747.323117] Internal error: Oops - BUG: 0 [#1] SMP ...... [130747.334329] Call trace: [130747.334553] ext4escacheextent+0x150/0x168 [ext4] [130747.334975] ext4cacheextents+0x64/0xe8 [ext4] [130747.335368] ext4findextent+0x300/0x330 [ext4] [130747.335759] ext4extmapblocks+0x74/0x1178 [ext4] [130747.336179] ext4mapblocks+0x2f4/0x5f0 [ext4] [130747.336567] ext4mpagereadpages+0x4a8/0x7a8 [ext4] [130747.336995] ext4readpage+0x54/0x100 [ext4] [130747.337359] genericfilebufferedread+0x410/0xae8 [130747.337767] genericfilereaditer+0x114/0x190 [130747.338152] ext4filereaditer+0x5c/0x140 [ext4] [130747.338556] _vfsread+0x11c/0x188 [130747.338851] vfsread+0x94/0x150 [130747.339110] ksysread+0x74/0xf0

This patch's modification is according to Jan Kara's suggestion in: https://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/ "I see. Now I understand your patch. Honestly, seeing how fragile is trying to fix extent tree after split has failed in the middle, I would probably go even further and make sure we fix the tree properly in case of ENOSPC and EDQUOT (those are easily user triggerable). Anything else indicates a HW problem or fs corruption so I'd rather leave the extent tree as is and don't try to fix it (which also means we will not create overlapping extents)."

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.46-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.46-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.46-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}