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drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()

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The kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8
bytes via memset without checking the buffer size parameter. This allows
unprivileged userspace to trigger an out-of bounds kernel memory write
by passing a small buffer, leading to  potential privilege
escalation.

Signed-off-by: Sunday Clement <Sunday.Clement@amd.com>
Reviewed-by: Alexander Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Sunday Clement
2026-02-02 12:41:39 -05:00
committed by Alex Deucher
parent 56423871e9
commit 8a70a26c9f
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/amdkfd/kfd_events.c
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@@ -331,6 +331,12 @@ static int kfd_event_page_set(struct kfd_process *p, void *kernel_address,
if (p->signal_page)
return -EBUSY;
if (size < KFD_SIGNAL_EVENT_LIMIT * 8) {
pr_err("Event page size %llu is too small, need at least %lu bytes\n",
size, (unsigned long)(KFD_SIGNAL_EVENT_LIMIT * 8));
return -EINVAL;
}
page = kzalloc(sizeof(*page), GFP_KERNEL);
if (!page)
return -ENOMEM;