Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak btrfs_ioctl_space_info() has a TOCTOU race between two passes over the block group RAID type lists. The first pass counts entries to determine the allocation size, then the second pass fills the buffer. The groups_sem rwlock is released between passes, allowing concurrent block group removal to reduce the entry count. When the second pass fills fewer entries than the first pass counted, copy_to_user() copies the full alloc_size bytes including trailing uninitialized kmalloc bytes to userspace. Fix by copying only total_spaces entries (the actually-filled count from the second pass) instead of alloc_size bytes, and switch to kzalloc so any future copy size mismatch cannot leak heap data.
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
7fde62bffb576d384ea49a3aed3403d5609ee5bc to < f407aad350bdea4db300c47433573b7a41630d33affected7fde62bffb576d384ea49a3aed3403d5609ee5bc to < d8224b1be6627c6c3b204bfb264508d27c65ac44affected7fde62bffb576d384ea49a3aed3403d5609ee5bc to < d69a4a6813fdba7c4cc3695a7e843842b240790daffected7fde62bffb576d384ea49a3aed3403d5609ee5bc to < f5ee467b56764964027c361641f64953fc0f8f9aaffected7fde62bffb576d384ea49a3aed3403d5609ee5bc to < 4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3affected7fde62bffb576d384ea49a3aed3403d5609ee5bc to < 5d12e0ab009ade48c1bff9324fd9bea2c773d088affected7fde62bffb576d384ea49a3aed3403d5609ee5bc to < d09d67d5de577cedae3de9497dff217e0ac8b641affected7fde62bffb576d384ea49a3aed3403d5609ee5bc to < 973e57c726c1f8e77259d1c8e519519f1e9aea77affected
Linux Linux
Default version status: affected
2.6.34affected0 to < 2.6.34unaffected5.10.259 to ≤ 5.10.*unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.140 to ≤ 6.6.*unaffected6.12.90 to ≤ 6.12.*unaffected6.18.32 to ≤ 6.18.*unaffected7.0.7 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/f407aad350bdea4db300c47433573b7a41630d33 ↗
- https://git.kernel.org/stable/c/d8224b1be6627c6c3b204bfb264508d27c65ac44 ↗
- https://git.kernel.org/stable/c/d69a4a6813fdba7c4cc3695a7e843842b240790d ↗
- https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a ↗
- https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3 ↗
- https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088 ↗
- https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641 ↗
- https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗