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drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise

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When user provides a bogus pat_index value through the madvise IOCTL, the
xe_pat_index_get_coh_mode() function performs an array access without
validating bounds. This allows a malicious user to trigger an out-of-bounds
kernel read from the xe->pat.table array.

The vulnerability exists because the validation in madvise_args_are_sane()
directly calls xe_pat_index_get_coh_mode(xe, args->pat_index.val) without
first checking if pat_index is within [0, xe->pat.n_entries).

Although xe_pat_index_get_coh_mode() has a WARN_ON to catch this in debug
builds, it still performs the unsafe array access in production kernels.

v2(Matthew Auld)
- Using array_index_nospec() to mitigate spectre attacks when the value
is used

v3(Matthew Auld)
- Put the declarations at the start of the block

Fixes: ada7486c56 ("drm/xe: Implement madvise ioctl for xe")
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Cc: <stable@vger.kernel.org> # v6.18+
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Jia Yao <jia.yao@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20260205161529.1819276-1-jia.yao@intel.com
(cherry picked from commit 944a3329b0)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Jia Yao 2026-02-05 16:15:29 +00:00 committed by Rodrigo Vivi
parent 2a673fb4d7
commit fbbe32618e
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GPG Key ID: FA625F640EEB13CA
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/xe/xe_vm_madvise.c
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@ -291,8 +291,13 @@ static bool madvise_args_are_sane(struct xe_device *xe, const struct drm_xe_madv
break;
case DRM_XE_MEM_RANGE_ATTR_PAT:
{
u16 coh_mode = xe_pat_index_get_coh_mode(xe, args->pat_index.val);
u16 pat_index, coh_mode;
if (XE_IOCTL_DBG(xe, args->pat_index.val >= xe->pat.n_entries))
return false;
pat_index = array_index_nospec(args->pat_index.val, xe->pat.n_entries);
coh_mode = xe_pat_index_get_coh_mode(xe, pat_index);
if (XE_IOCTL_DBG(xe, !coh_mode))
return false;