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CVE-2023-52699

sysv: don't call sb_bread() with pointers_lock held

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.312, 5.4.274, 5.10.215, 5.15.155, 6.1.86, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: sysv: don't call sb_bread() with pointers_lock held syzbot is reporting sleep in atomic context in SysV filesystem [1], for sb_bread() is called with rw_spinlock held. A "write_lock(&pointers_lock) => read_lock(&pointers_lock) deadlock" bug and a "sb_bread() with write_lock(&pointers_lock)" bug were introduced by "Replace BKL for chain locking with sysvfs-private rwlock" in Linux 2.5.12. Then, "[PATCH] err1-40: sysvfs locking fix" in Linux 2.6.8 fixed the former bug by moving pointers_lock lock to the callers, but instead introduced a "sb_bread() with read_lock(&pointers_lock)" bug (which made this problem easier to hit). Al Viro suggested that why not to do like get_branch()/get_block()/ find_shared() in Minix filesystem does. And doing like that is almost a revert of "[PATCH] err1-40: sysvfs locking fix" except that get_branch() from with find_shared() is called without write_lock(&pointers_lock).

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 13b33feb2ebddc2b1aa607f553566b18a4af1d76; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 1b4fe801b5bedec2b622ddb18e5c9bf26c63d79f; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 674c1c4229e743070e09db63a23442950ff000d1; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in fd203d2c671bdee9ab77090ff394d3b71b627927; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 53cb1e52c9db618c08335984d1ca80db220ccf09; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 89e8524135a3902e7563a5a59b7b5ec1bf4904ac; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in a69224223746ab96d43e5db9d22d136827b7e2d3; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in f123dc86388cb669c3d6322702dc441abc35c31e

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 4.19.312; From 4.20.0 · fixed in 5.4.274; From 5.5.0 · fixed in 5.10.215; From 5.11.0 · fixed in 5.15.155; From 5.16.0 · fixed in 6.1.86; From 6.2.0 · fixed in 6.6.27; From 6.7.0 · fixed in 6.8.6

References 8

git.kernel.org