Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.
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
d3bec0138bfbe58606fc1d6f57a4cdc1a20218db to < d138ea2fe01c254413d5a6104eb236e0d5c7dd9aaffectedd3bec0138bfbe58606fc1d6f57a4cdc1a20218db to < e19c5ed9f1922a6854073f8651a63fa7be26e9e9affectedd3bec0138bfbe58606fc1d6f57a4cdc1a20218db to < e0378419b0e20178b5d100b27c9cc7e51064202eaffectedd3bec0138bfbe58606fc1d6f57a4cdc1a20218db to < 6086079e6d1c32ba4c4b422612b8aebb1129a96caffectedd3bec0138bfbe58606fc1d6f57a4cdc1a20218db to < 634a793d0e1c822412095d25a1338f8831ad894caffectedd3bec0138bfbe58606fc1d6f57a4cdc1a20218db to < 576afddfee8d1108ee299bf10f581593540d1a36affectedc602ad2b52dcbca5af08e5137bd5575c039b52e3affectedab68b940dd6f7b5f8e2557937162dcb8a0583a05affected5.4.78 to < 5.5affected5.9.9 to < 5.10affected
Linux Linux
Default version status: affected
5.10affected0 to < 5.10unaffected6.1.191 to ≤ 6.1.*unaffected6.6.141 to ≤ 6.6.*unaffected6.12.91 to ≤ 6.12.*unaffected6.18.33 to ≤ 6.18.*unaffected7.0.10 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d138ea2fe01c254413d5a6104eb236e0d5c7dd9a ↗
- https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9 ↗
- https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e ↗
- https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c ↗
- https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c ↗
- https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36 ↗