* [PATCH 4.9 085/118] drm/i915: Relax mmap VMA check
[not found] <20190322111215.873964544@linuxfoundation.org>
@ 2019-03-22 11:15 ` Greg Kroah-Hartman
0 siblings, 0 replies; only message in thread
From: Greg Kroah-Hartman @ 2019-03-22 11:15 UTC (permalink / raw)
To: linux-kernel
Cc: Sasha Levin, Greg Kroah-Hartman, intel-gfx, stable, Akash Goel,
Guenter Roeck, Adam Zabrocki
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit ca22f32a6296cbfa29de56328c8505560a18cfa8 ]
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: 5c4604e757ba ("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 a90e1948efb648f567444f87f3c19b2a0787affd)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/i915/i915_gem.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1600,7 +1600,8 @@ __vma_matches(struct vm_area_struct *vma
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);
}
/**
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