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THREATINT
PUBLISHED

CVE-2024-44993

drm/v3d: Fix out-of-bounds read in `v3d_csd_job_run()`



AssignerLinux
Reserved2024-08-21
Published2024-09-04
Updated2024-09-15

Description

In the Linux kernel, the following vulnerability has been resolved: drm/v3d: Fix out-of-bounds read in `v3d_csd_job_run()` When enabling UBSAN on Raspberry Pi 5, we get the following warning: [ 387.894977] UBSAN: array-index-out-of-bounds in drivers/gpu/drm/v3d/v3d_sched.c:320:3 [ 387.903868] index 7 is out of range for type '__u32 [7]' [ 387.909692] CPU: 0 PID: 1207 Comm: kworker/u16:2 Tainted: G WC 6.10.3-v8-16k-numa #151 [ 387.919166] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT) [ 387.925961] Workqueue: v3d_csd drm_sched_run_job_work [gpu_sched] [ 387.932525] Call trace: [ 387.935296] dump_backtrace+0x170/0x1b8 [ 387.939403] show_stack+0x20/0x38 [ 387.942907] dump_stack_lvl+0x90/0xd0 [ 387.946785] dump_stack+0x18/0x28 [ 387.950301] __ubsan_handle_out_of_bounds+0x98/0xd0 [ 387.955383] v3d_csd_job_run+0x3a8/0x438 [v3d] [ 387.960707] drm_sched_run_job_work+0x520/0x6d0 [gpu_sched] [ 387.966862] process_one_work+0x62c/0xb48 [ 387.971296] worker_thread+0x468/0x5b0 [ 387.975317] kthread+0x1c4/0x1e0 [ 387.978818] ret_from_fork+0x10/0x20 [ 387.983014] ---[ end trace ]--- This happens because the UAPI provides only seven configuration registers and we are reading the eighth position of this u32 array. Therefore, fix the out-of-bounds read in `v3d_csd_job_run()` by accessing only seven positions on the '__u32 [7]' array. The eighth register exists indeed on V3D 7.1, but it isn't currently used. That being so, let's guarantee that it remains unused and add a note that it could be set in a future patch.

Product status

Default status
0x4004c6c570

0ad5bc1ce463 before d656b82c4b30
affected

0ad5bc1ce463 before 497d370a644d
affected

Default status
0x4004c6c600

6.8
affected

Any version before 6.8
unaffected

6.10.7
unaffected

6.11
unaffected

References

https://git.kernel.org/stable/c/d656b82c4b30cf12715e6cd129d3df808fde24a7

https://git.kernel.org/stable/c/497d370a644d95a9f04271aa92cb96d32e84c770

cve.org CVE-2024-44993

nvd.nist.gov CVE-2024-44993

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