diff options
| author | Sunday Clement <Sunday.Clement@amd.com> | 2026-02-02 12:41:39 -0500 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 07:21:15 -0500 |
| commit | 4857c37c7ba9aa38b9a4c694e8bd8d0091c87940 (patch) | |
| tree | 44149b3902eeda59b00bfc9e017dba4465063aa1 | |
| parent | 7a4fd19c567fe740fe137b371fa072845f2fc63e (diff) | |
drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()
[ Upstream commit 8a70a26c9f34baea6c3199a9862ddaff4554a96d ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_events.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c index 2b07c0000df6..c98a08c269ae 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c @@ -330,6 +330,12 @@ 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; |