Description
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).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 13b33feb2ebddc2b1aa607f553566b18a4af1d76affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1b4fe801b5bedec2b622ddb18e5c9bf26c63d79faffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 674c1c4229e743070e09db63a23442950ff000d1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < fd203d2c671bdee9ab77090ff394d3b71b627927affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 53cb1e52c9db618c08335984d1ca80db220ccf09affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 89e8524135a3902e7563a5a59b7b5ec1bf4904acaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a69224223746ab96d43e5db9d22d136827b7e2d3affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f123dc86388cb669c3d6322702dc441abc35c31eaffected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected4.19.312 to ≤ 4.19.*unaffected5.4.274 to ≤ 5.4.*unaffected5.10.215 to ≤ 5.10.*unaffected5.15.155 to ≤ 5.15.*unaffected6.1.86 to ≤ 6.1.*unaffected6.6.27 to ≤ 6.6.*unaffected6.8.6 to ≤ 6.8.*unaffected6.9 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/13b33feb2ebddc2b1aa607f553566b18a4af1d76 ↗
- https://git.kernel.org/stable/c/1b4fe801b5bedec2b622ddb18e5c9bf26c63d79f ↗
- https://git.kernel.org/stable/c/674c1c4229e743070e09db63a23442950ff000d1 ↗
- https://git.kernel.org/stable/c/fd203d2c671bdee9ab77090ff394d3b71b627927 ↗
- https://git.kernel.org/stable/c/53cb1e52c9db618c08335984d1ca80db220ccf09 ↗
- https://git.kernel.org/stable/c/89e8524135a3902e7563a5a59b7b5ec1bf4904ac ↗
- https://git.kernel.org/stable/c/a69224223746ab96d43e5db9d22d136827b7e2d3 ↗
- https://git.kernel.org/stable/c/f123dc86388cb669c3d6322702dc441abc35c31e ↗
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html ↗
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html ↗