github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-27 17:47:41 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/amdgpu/gfx: fix cleaner shader IB buffer overflow

Browse Source 
The cleaner shader sysfs path allocates a 16-dword (64 byte) IB but
incorrectly fills (align_mask + 1) dwords. On GFX rings align_mask is
0xff, so the loop wrote 256 dwords into a 64-byte buffer, causing a
kernel page fault.

The IB only needs to be a minimal NOP shell to schedule the job; the
cleaner shader itself is emitted on the ring via emit_cleaner_shader().
Fill 16 dwords to match the allocation.

v2: Use ib_size_dw variable (Lijo)

Fixes: d361ad5d2f ("drm/amdgpu: Add sysfs interface for running cleaner shader")
Suggested-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Asad Kamal <asad.kamal@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit bf21af331ebf72d0935fd70c73192414a422c03a)
CC: stable@vger.kernel.org
This commit is contained in:
Asad Kamal 2026-06-05 23:44:08 +08:00 committed by Alex Deucher
parent 3d3372add0
commit 3e864bf2a3
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
View File

@ -1664,12 +1664,13 @@ static int amdgpu_gfx_run_cleaner_shader_job(struct amdgpu_ring *ring)
struct amdgpu_device *adev = ring->adev;
struct drm_gpu_scheduler *sched = &ring->sched;
struct drm_sched_entity entity;
unsigned int ib_size_dw = 16;
static atomic_t counter;
struct dma_fence *f;
struct amdgpu_job *job;
struct amdgpu_ib *ib;
void *owner;
int i, r;
int r;
/* Initialize the scheduler entity */
r = drm_sched_entity_init(&entity, DRM_SCHED_PRIORITY_NORMAL,
@ -1687,7 +1688,7 @@ static int amdgpu_gfx_run_cleaner_shader_job(struct amdgpu_ring *ring)
owner = (void *)(unsigned long)atomic_inc_return(&counter);
r = amdgpu_job_alloc_with_ib(ring->adev, &entity, owner,
64, 0, &job,
ib_size_dw * sizeof(uint32_t), 0, &job,
AMDGPU_KERNEL_JOB_ID_CLEANER_SHADER);
if (r)
goto err;
@ -1697,9 +1698,8 @@ static int amdgpu_gfx_run_cleaner_shader_job(struct amdgpu_ring *ring)
job->run_cleaner_shader = true;
ib = &job->ibs[0];
for (i = 0; i <= ring->funcs->align_mask; ++i)
ib->ptr[i] = ring->funcs->nop;
ib->length_dw = ring->funcs->align_mask + 1;
memset32(ib->ptr, ring->funcs->nop, ib_size_dw);
ib->length_dw = ib_size_dw;
f = amdgpu_job_submit(job);