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drm/xe/ufence: Prefetch ufence addr to catch bogus address

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access_ok() only checks for addr overflow so also try to read the addr
to catch invalid addr sent from userspace.

Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1630
Cc: Francois Dugast <francois.dugast@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016082304.66009-2-nirmoy.das@intel.com
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
(cherry picked from commit 9408c45084)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
This commit is contained in:
Nirmoy Das 2024-10-16 10:23:03 +02:00 committed by Lucas De Marchi
parent 69418db678
commit 9c1813b325
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/xe/xe_sync.c
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@ -54,8 +54,9 @@ static struct xe_user_fence *user_fence_create(struct xe_device *xe, u64 addr,
{
struct xe_user_fence *ufence;
u64 __user *ptr = u64_to_user_ptr(addr);
u64 __maybe_unused prefetch_val;
if (!access_ok(ptr, sizeof(*ptr)))
if (get_user(prefetch_val, ptr))
return ERR_PTR(-EFAULT);
ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);