| Summary: |
VUL-0: CVE-2021-46945: kernel-source,kernel-source-azure,kernel-source-rt: ext4: inconsistent behavior when errors=panic is specified |
| Product: |
[Novell Products] SUSE Security Incidents
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Reporter: |
SMASH SMASH <smash_bz> |
| Component: |
Incidents | Assignee: |
Kernel Bugs <kernel-bugs> |
| Status: |
RESOLVED
FIXED
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QA Contact: |
Security Team bot <security-team> |
| Severity: |
Normal
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| Priority: |
P5 - None
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CC: |
carlos.lopez, jack, mhocko
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| Version: |
unspecified | |
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| Target Milestone: |
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| Hardware: |
Other | |
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| OS: |
Other | |
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| URL: |
https://smash.suse.de/issue/395352/
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| Whiteboard: |
CVSSv3.1:SUSE:CVE-2021-46945:4.4:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L) |
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Found By:
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Security Response Team
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Services Priority:
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Business Priority:
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Blocker:
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---
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Marketing QA Status:
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IT Deployment:
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In the Linux kernel, the following vulnerability has been resolved: ext4: always panic when errors=panic is specified Before commit 014c9caa29d3 ("ext4: make ext4_abort() use __ext4_error()"), the following series of commands would trigger a panic: 1. mount /dev/sda -o ro,errors=panic test 2. mount /dev/sda -o remount,abort test After commit 014c9caa29d3, remounting a file system using the test mount option "abort" will no longer trigger a panic. This commit will restore the behaviour immediately before commit 014c9caa29d3. (However, note that the Linux kernel's behavior has not been consistent; some previous kernel versions, including 5.4 and 4.19 similarly did not panic after using the mount option "abort".) This also makes a change to long-standing behaviour; namely, the following series commands will now cause a panic, when previously it did not: 1. mount /dev/sda -o ro,errors=panic test 2. echo test > /sys/fs/ext4/sda/trigger_fs_error However, this makes ext4's behaviour much more consistent, so this is a good thing. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-46945 https://www.cve.org/CVERecord?id=CVE-2021-46945 https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4 https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995