Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc() kasan_populate_vmalloc() and its helpers ignore the caller's gfp_mask and always allocate memory using the hardcoded GFP_KERNEL flag. This makes them inconsistent with vmalloc(), which was recently extended to support GFP_NOFS and GFP_NOIO allocations. Page table allocations performed during shadow population also ignore the external gfp_mask. To preserve the intended semantics of GFP_NOFS and GFP_NOIO, wrap the apply_to_page_range() calls into the appropriate memalloc scope. xfs calls vmalloc with GFP_NOFS, so this bug could lead to deadlock. There was a report here https://lkml.kernel.org/r/686ea951.050a0220.385921.0016.GAE@google.com This patch: - Extends kasan_populate_vmalloc() and helpers to take gfp_mask; - Passes gfp_mask down to alloc_pages_bulk() and __get_free_page(); - Enforces GFP_NOFS/NOIO semantics with memalloc_*_save()/restore() around apply_to_page_range(); - Updates vmalloc.c and percpu allocator call sites accordingly.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 451769ebb7e792c3404db53b3c2a422990de654e before 9598c83a50a5f9d57fd0c12fc08d9425c1ce9537; affected 451769ebb7e792c3404db53b3c2a422990de654e before aa1b4b7a1b92743297f9da741424df4703a8e11b; affected 451769ebb7e792c3404db53b3c2a422990de654e before 33b95d90427cb4babf32059e323a6d0c027610fe; affected 451769ebb7e792c3404db53b3c2a422990de654e before 79357cd06d41d0f5a11b17d7c86176e395d10ef2 |
| Linux / Linux | affected 5.17; unaffected 0 before 5.17; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.16.8 through 6.16.*; unaffected 6.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/9598c83a50a5f9d57fd0c12fc08d9425c1ce9537
- https://git.kernel.org/stable/c/aa1b4b7a1b92743297f9da741424df4703a8e11b
- https://git.kernel.org/stable/c/33b95d90427cb4babf32059e323a6d0c027610fe
- https://git.kernel.org/stable/c/79357cd06d41d0f5a11b17d7c86176e395d10ef2
ADP enrichment
No English description supplied.
No references supplied.