NULL Pointer Dereference Affecting kernel-devel-azure package, versions <5.14.21-150500.33.57.1
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Start learning- Snyk IDSNYK-SLES155-KERNELDEVELAZURE-7253450
- published14 Jun 2024
- disclosed13 Jun 2024
Introduced: 13 Jun 2024
CVE-2023-52738 (opens in a new tab)How to fix?
Upgrade SLES:15.5 kernel-devel-azure to version 5.14.21-150500.33.57.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-devel-azure package and not the kernel-devel-azure package as distributed by SLES.
See How to fix? for SLES:15.5 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu/fence: Fix oops due to non-matching drm_sched init/fini
Currently amdgpu calls drm_sched_fini() from the fence driver sw fini routine - such function is expected to be called only after the respective init function - drm_sched_init() - was executed successfully.
Happens that we faced a driver probe failure in the Steam Deck recently, and the function drm_sched_fini() was called even without its counter-part had been previously called, causing the following oops:
amdgpu: probe of 0000:04:00.0 failed with error -110 BUG: kernel NULL pointer dereference, address: 0000000000000090 PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 609 Comm: systemd-udevd Not tainted 6.2.0-rc3-gpiccoli #338 Hardware name: Valve Jupiter/Jupiter, BIOS F7A0113 11/04/2022 RIP: 0010:drm_sched_fini+0x84/0xa0 [gpu_sched] [...] Call Trace: <TASK> amdgpu_fence_driver_sw_fini+0xc8/0xd0 [amdgpu] amdgpu_device_fini_sw+0x2b/0x3b0 [amdgpu] amdgpu_driver_release_kms+0x16/0x30 [amdgpu] devm_drm_dev_init_release+0x49/0x70 [...]
To prevent that, check if the drm_sched was properly initialized for a given ring before calling its fini counter-part.
Notice ideally we'd use sched.ready for that; such field is set as the latest thing on drm_sched_init(). But amdgpu seems to "override" the meaning of such field - in the above oops for example, it was a GFX ring causing the crash, and the sched.ready field was set to true in the ring init routine, regardless of the state of the DRM scheduler. Hence, we ended-up using sched.ops as per Christian's suggestion [0], and also removed the no_scheduler check [1].
[0] https://lore.kernel.org/amd-gfx/984ee981-2906-0eaf-ccec-9f80975cb136@amd.com/ [1] https://lore.kernel.org/amd-gfx/cd0e2994-f85f-d837-609f-7056d5fb7231@amd.com/
References
- https://www.suse.com/security/cve/CVE-2023-52738.html
- https://bugzilla.suse.com/1225005
- https://git.kernel.org/stable/c/2bcbbef9cace772f5b7128b11401c515982de34b
- https://git.kernel.org/stable/c/2e557c8ca2c585bdef591b8503ba83b85f5d0afd
- https://git.kernel.org/stable/c/5ad7bbf3dba5c4a684338df1f285080f2588b535