diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-03-14 07:58:29 +0000 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2019-03-18 13:59:42 -0700 |
| commit | 000c4f90e3f0194eef218ff2c6a8fd8ca1de4313 (patch) | |
| tree | 4bed2fed5f66dbd28c42f7039844489cc27f9a28 | |
| parent | 65f26e978d7c55c3c3d04296058d95cf7b6e3f14 (diff) | |
drm/i915: Sanity check mmap length against object sizedrm-intel-fixes-2019-03-20
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@chris-wilson.co.uk
(cherry picked from commit 794a11cb67201ad1bb61af510bb8460280feb3f3)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 30d516e975c6..8558e81fdc2a 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1734,8 +1734,13 @@ 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, @@ -1749,8 +1754,8 @@ 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)) @@ -1768,12 +1773,10 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data, i915_gem_object_put(obj); args->addr_ptr = (u64)addr; - return 0; err: i915_gem_object_put(obj); - return addr; } |