Description
In the Linux kernel, the following vulnerability has been resolved: bpf: avoid holding freeze_mutex during mmap operation We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0]. So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment. [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/
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
fc9702273e2edb90400a34b3be76f7b08fa3344b to < 2ce31c97c219b4fe797749f950274f246eb88c49affectedfc9702273e2edb90400a34b3be76f7b08fa3344b to < 0d90d9e154144a3a80e9fc0eb9b21b7fc990f68faffectedfc9702273e2edb90400a34b3be76f7b08fa3344b to < 4759acbd44d24a69b7b14848012ec4201d6c5501affectedfc9702273e2edb90400a34b3be76f7b08fa3344b to < 29cfda62ab4d92ab94123813db49ab76c1e61b29affectedfc9702273e2edb90400a34b3be76f7b08fa3344b to < d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4affectedfc9702273e2edb90400a34b3be76f7b08fa3344b to < 271e49f8a58edba65bc2b1250a0abaa98c4bfdbeaffectedfc9702273e2edb90400a34b3be76f7b08fa3344b to < bc27c52eea189e8f7492d40739b7746d67b65bebaffected
Linux Linux
Default version status: affected
5.5affected0 to < 5.5unaffected5.10.237 to ≤ 5.10.*unaffected5.15.181 to ≤ 5.15.*unaffected6.1.135 to ≤ 6.1.*unaffected6.6.80 to ≤ 6.6.*unaffected6.12.17 to ≤ 6.12.*unaffected6.13.5 to ≤ 6.13.*unaffected6.14 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/2ce31c97c219b4fe797749f950274f246eb88c49 ↗
- https://git.kernel.org/stable/c/0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f ↗
- https://git.kernel.org/stable/c/4759acbd44d24a69b7b14848012ec4201d6c5501 ↗
- https://git.kernel.org/stable/c/29cfda62ab4d92ab94123813db49ab76c1e61b29 ↗
- https://git.kernel.org/stable/c/d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4 ↗
- https://git.kernel.org/stable/c/271e49f8a58edba65bc2b1250a0abaa98c4bfdbe ↗
- https://git.kernel.org/stable/c/bc27c52eea189e8f7492d40739b7746d67b65beb ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗