AMD DRM driver recursive lock defect in amdgpu_devoce_dump_format

Vulnerability Summary Vulnerability Overview Title: drm/amdgpu: fix recursive mutex acquire in amd_gpu_devoce_dump_format Issue: In , when the dump originates from a hung job, recursively calls , leading to a recursive lock acquisition on the of the , triggering a warning ( ). Root Cause: calls on the of the , while the of the already holds this lock, resulting in recursive locking. Scope of Impact Affected Module: Trigger Condition: When a GPU hung job occurs and triggers , if the of the already holds the , calling again will cause recursive locking. Impact: May cause to report a recursive locking warning, affecting system stability and the output of debugging information. Fix Details Fix Approach: In , when is true, skip the lock acquisition on the of the to avoid recursive locking. Key Changes: - In , when is true, do not attempt to lock the of the . - In , when is true, skip the lock acquisition on the of the . POC/Exploitation Code ```c static void amd_gpu_devoce_dump_format(char buffer, size_t count, struct amd_gpu_core_dump_info coredump) { struct amd_gpu_device adev = coredump->adev; struct drm_printer p; struct drm_printer_iterator iter; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = NULL; struct amd_gpu_bo abo = N

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AMD DRM driver recursive lock defect in amdgpu_devoce_dump_format

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