| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-56652: drm/xe/reg_sr: Remove register pool |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/xe/reg_sr: Remove register pool |
| |
| That pool implementation doesn't really work: if the krealloc happens to |
| move the memory and return another address, the entries in the xarray |
| become invalid, leading to use-after-free later: |
| |
| BUG: KASAN: slab-use-after-free in xe_reg_sr_apply_mmio+0x570/0x760 [xe] |
| Read of size 4 at addr ffff8881244b2590 by task modprobe/2753 |
| |
| Allocated by task 2753: |
| kasan_save_stack+0x39/0x70 |
| kasan_save_track+0x14/0x40 |
| kasan_save_alloc_info+0x37/0x60 |
| __kasan_kmalloc+0xc3/0xd0 |
| __kmalloc_node_track_caller_noprof+0x200/0x6d0 |
| krealloc_noprof+0x229/0x380 |
| |
| Simplify the code to fix the bug. A better pooling strategy may be added |
| back later if needed. |
| |
| (cherry picked from commit e5283bd4dfecbd3335f43b62a68e24dae23f59e4) |
| |
| The Linux kernel CVE team has assigned CVE-2024-56652 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit dd08ebf6c3525a7ea2186e636df064ea47281987 and fixed in 6.12.6 with commit b0193a31a0ca5a0f9e60bb4a86537d46b98111b8 |
| Issue introduced in 6.8 with commit dd08ebf6c3525a7ea2186e636df064ea47281987 and fixed in 6.13 with commit d7b028656c29b22fcde1c6ee1df5b28fbba987b5 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-56652 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/gpu/drm/xe/xe_reg_sr.c |
| drivers/gpu/drm/xe/xe_reg_sr_types.h |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/b0193a31a0ca5a0f9e60bb4a86537d46b98111b8 |
| https://git.kernel.org/stable/c/d7b028656c29b22fcde1c6ee1df5b28fbba987b5 |
