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9c6ffdb41f
The kfd_wait_on_events ioctl passes a user-supplied num_events parameter
directly to alloc_event_waiters() which calls kcalloc() without validation.
This allows unprivileged users with /dev/kfd access to trigger large kernel
memory allocations, potentially causing memory exhaustion and denial of
service via the OOM killer.
Add a check to reject num_events values exceeding KFD_SIGNAL_EVENT_LIMIT
(4096), which is the maximum number of events a single process can create.
Signed-off-by: Sunday Clement <Sunday.Clement@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 39eb6da7ac)