Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: drm/xe/guc: Fix buffer overflow in steered register list allocation The size calculation for the steered register extarray uses only the geometry DSS mask (g_dss_mask) to determine the number of entries to allocate: total = bitmap_weight(gt->fuse_topo.g_dss_mask, ...) * steer_reg_num; However, the filling loop uses for_each_dss_steering(), which iterates over for_each_dss(), defined as the union of g_dss_mask and c_dss_mask (geometry + compute DSS). On platforms with compute-only DSS bits, the loop writes past the allocated buffer, corrupting adjacent slab objects. This manifests as list_del corruption and SLUB redzone overwrites during drm_managed_release on device unbind, since the overflow corrupts the drmres list_head of neighboring allocations. Fix by computing the allocation size using the union of both DSS masks, matching the iteration pattern of for_each_dss_steering(). -- v2: - use bitmap_weighted_or() (Zhanjun) (cherry picked from commit 0a78a44f4901aa6c9263e66be7fce02282f1109f)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b170d696c1e2226713471d810c63b1162335079f before b485bfb45555163bfa5f565d6a3415fcb3035b02; affected b170d696c1e2226713471d810c63b1162335079f before a9a020f3c11eba6573b699f9cf9245a51b025ade; affected b170d696c1e2226713471d810c63b1162335079f before 632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0 |
| Linux / Linux | affected 6.13; unaffected 0 before 6.13; unaffected 6.18.44 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/b485bfb45555163bfa5f565d6a3415fcb3035b02
- https://git.kernel.org/stable/c/a9a020f3c11eba6573b699f9cf9245a51b025ade
- https://git.kernel.org/stable/c/632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0
ADP enrichment
No English description supplied.
No references supplied.