CVE-2023-53337

Summary

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

nilfs2: do not write dirty data after degenerating to read-only

According to syzbot's report, mark_buffer_dirty() called from nilfs_segctor_do_construct() outputs a warning with some patterns after nilfs2 detects metadata corruption and degrades to read-only mode.

After such read-only degeneration, page cache data may be cleared through nilfs_clear_dirty_page() which may also clear the uptodate flag for their buffer heads. However, even after the degeneration, log writes are still performed by unmount processing etc., which causes mark_buffer_dirty() to be called for buffer heads without the "uptodate" flag and causes the warning.

Since any writes should not be done to a read-only file system in the first place, this fixes the warning in mark_buffer_dirty() by letting nilfs_segctor_do_construct() abort early if in read-only mode.

This also changes the retry check of nilfs_segctor_write_out() to avoid unnecessary log write retries if it detects -EROFS that nilfs_segctor_do_construct() returned.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < bd89073fc7a5d03b1d06b372addbe405e5a925f4affected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < e9c5412c5972124776c1b873533eb39e287a4dfaaffected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < 4569a292a84e340e97d178898ad1cfe1a3080a61affected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < 7c3e662048053802f6b0db3a78e97f4e1f7edc4faffected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < 13f73ef77baa4764dc1ca4fcbae9cade05b83866affected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < a73201c607d8e506358d60aafddda4246bdd9350affected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < 4005cec6847c06ee191583270b7cdd7e696543ccaffected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < 55f7810632f993cff622a0ddbc7c865892294b61affected
LinuxLinux8c26c4e2694a163d525976e804d81cd955bbb40c < 28a65b49eb53e172d23567005465019658bfdb4daffected
LinuxLinux3.10affected
LinuxLinux0 < 3.10unaffected
LinuxLinux4.14.315 <= 4.14.*unaffected
LinuxLinux4.19.283 <= 4.19.*unaffected
LinuxLinux5.4.243 <= 5.4.*unaffected
LinuxLinux5.10.180 <= 5.10.*unaffected
LinuxLinux5.15.111 <= 5.15.*unaffected
LinuxLinux6.1.28 <= 6.1.*unaffected
LinuxLinux6.2.15 <= 6.2.*unaffected
LinuxLinux6.3.2 <= 6.3.*unaffected
LinuxLinux6.4 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References