[ Upstream commit 000c4f90e3f0194eef218ff2c6a8fd8ca1de4313 ]
We assumed that vm_mmap() would reject an attempt to mmap past the end of the filp (our object), but we were wrong.
Applications that tried to use the mmap beyond the end of the object would be greeted by a SIGBUS. After this patch, those applications will be told about the error on creating the mmap, rather than at a random moment on later access.
Reported-by: Antonio Argenziano antonio.argenziano@intel.com Testcase: igt/gem_mmap/bad-size Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Antonio Argenziano antonio.argenziano@intel.com Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: Tvrtko Ursulin tvrtko.ursulin@intel.com Cc: stable@vger.kernel.org Reviewed-by: Tvrtko Ursulin tvrtko.ursulin@intel.com Reviewed-by: Joonas Lahtinen joonas.lahtinen@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20190314075829.16838-1-chris@c... (cherry picked from commit 794a11cb67201ad1bb61af510bb8460280feb3f3) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/i915/i915_gem.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 9634d3adb8d01..9372877100420 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1874,8 +1874,13 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data, * pages from. */ if (!obj->base.filp) { - i915_gem_object_put(obj); - return -ENXIO; + addr = -ENXIO; + goto err; + } + + if (range_overflows(args->offset, args->size, (u64)obj->base.size)) { + addr = -EINVAL; + goto err; }
addr = vm_mmap(obj->base.filp, 0, args->size, @@ -1889,8 +1894,8 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data, struct vm_area_struct *vma;
if (down_write_killable(&mm->mmap_sem)) { - i915_gem_object_put(obj); - return -EINTR; + addr = -EINTR; + goto err; } vma = find_vma(mm, addr); if (vma && __vma_matches(vma, obj->base.filp, addr, args->size)) @@ -1908,12 +1913,10 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data, i915_gem_object_put(obj);
args->addr_ptr = (uint64_t) addr; - return 0;
err: i915_gem_object_put(obj); - return addr; }