drm/amdgpu: fix OOB risk parsing virt RAS batch trace replies on the VF

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amdgpu_virt_ras_get_batch_records() indexed batchs[] and records[]
from ras_cmd_batch_trace_record_rsp copied out of shared memory without
fully bounding the cache window or per-batch offset/trace_num. A
tampered or corrupted buffer could set real_batch_num past the array,
make a naive start_batch_id + real_batch_num comparison wrap in
uint64_t, or point offset+trace_num past records[].

Add amdgpu_virt_ras_check_batch_cached() for a subtraction-based window
with a real_batch_num cap, re-run it after GET_BATCH_TRACE_RECORD, and
use an explicit batch index into batchs[]. Consolidate batch_id,
trace_num, and offset+trace_num checks; on any failure memset the cache
and return -EIO so the next call refetches.

Signed-off-by: Chenglei Xie <Chenglei.Xie@amd.com>
Reviewed-by: YiPeng Chai <YiPeng.Chai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Chenglei Xie 2026-05-07 16:16:58 -04:00 • committed by Alex Deucher

parent 3635e1104a

commit c06b6cde2a

1 changed files with 25 additions and 10 deletions

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drivers/gpu/drm/amd/ras/ras_mgr/amdgpu_virt_ras_cmd.c

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