From a90e1948efb648f567444f87f3c19b2a0787affd Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin Date: Tue, 5 Mar 2019 11:04:08 +0000 Subject: [PATCH] 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 Fixes: 5c4604e757ba ("drm/i915: Prevent a race during I915_GEM_MMAP ioctl with WC set") Reported-by: Guenter Roeck Cc: Adam Zabrocki Cc: Joonas Lahtinen Cc: # v4.0+ Cc: Akash Goel Cc: Chris Wilson Cc: Jani Nikula Cc: Rodrigo Vivi Cc: intel-gfx@lists.freedesktop.org Reviewed-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20190305110409.28633-1-tvrtko.ursulin@linux.intel.com --- drivers/gpu/drm/i915/i915_gem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index c67369bd145b..0b23cf3be718 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1593,7 +1593,8 @@ __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); } /** -- 2.20.1