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drm/amdkfd: fix SMI event cross-process information leak

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kfd_smi_ev_enabled() skips the suser privilege check when pid=0.
PROCESS_START, PROCESS_END, and VMFAULT events are emitted with
pid=0 while carrying another process's PID and command name, so any
/dev/kfd user in the render group can monitor all GPU workloads.

Pass the target process PID into kfd_smi_event_add() for these events
so the existing per-client filter restricts delivery to the owning
process or CAP_SYS_ADMIN subscribers.

Signed-off-by: Yongqiang Sun <Yongqiang.Sun@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yongqiang Sun 2026-05-27 09:50:47 -04:00 committed by Alex Deucher
parent badcb0896b
commit 92a8dba246
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
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@ -254,8 +254,10 @@ void kfd_smi_event_update_vmfault(struct kfd_node *dev, uint16_t pasid)
if (task_info) {
/* Report VM faults from user applications, not retry from kernel */
if (task_info->task.pid)
kfd_smi_event_add(0, dev, KFD_SMI_EVENT_VMFAULT, KFD_EVENT_FMT_VMFAULT(
task_info->task.pid, task_info->task.comm));
kfd_smi_event_add(task_info->tgid, dev,
KFD_SMI_EVENT_VMFAULT,
KFD_EVENT_FMT_VMFAULT(task_info->task.pid,
task_info->task.comm));
amdgpu_vm_put_task_info(task_info);
}
}
@ -356,7 +358,7 @@ void kfd_smi_event_process(struct kfd_process_device *pdd, bool start)
task_info = amdgpu_vm_get_task_info_vm(avm);
if (task_info) {
kfd_smi_event_add(0, pdd->dev,
kfd_smi_event_add(task_info->tgid, pdd->dev,
start ? KFD_SMI_EVENT_PROCESS_START :
KFD_SMI_EVENT_PROCESS_END,
KFD_EVENT_FMT_PROCESS(task_info->task.pid,