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drm/i915: Relax mmap VMA check 

Legacy behaviour was to allow non-page-aligned mmap requests, as does the
linux mmap(2) implementation by virtue of automatically rounding up for
the caller.

To avoid breaking legacy userspace relax the newly introduced fix.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 5c4604e757 ("drm/i915: Prevent a race during I915_GEM_MMAP ioctl with WC set")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Cc: Adam Zabrocki <adamza@microsoft.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.0+
Cc: Akash Goel <akash.goel@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190305110409.28633-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit a90e1948ef)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Tvrtko Ursulin 2019-03-05 11:04:08 +00:00 committed by Rodrigo Vivi
parent c8c16f59b3
commit ca22f32a62
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_gem.c
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@ -1688,7 +1688,8 @@ __vma_matches(struct vm_area_struct *vma, struct file *filp,
if (vma->vm_file != filp)
return false;
return vma->vm_start == addr && (vma->vm_end - vma->vm_start) == size;
return vma->vm_start == addr &&
(vma->vm_end - vma->vm_start) == PAGE_ALIGN(size);
}
/**