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Pavel Roskin reported that DRM_IOCTL_MODE_GETCONNECTOR was overwritting the 4 bytes beyond the end of its structure with a 32-bit userspace running on a 64-bit kernel. This is due to the padding gcc inserts as the drm_mode_get_connector struct includes a u64 and its size is not a natural multiple of u64s. 64-bit kernel: sizeof(drm_mode_get_connector)=80, alignof=8 sizeof(drm_mode_get_encoder)=20, alignof=4 sizeof(drm_mode_modeinfo)=68, alignof=4 32-bit userspace: sizeof(drm_mode_get_connector)=76, alignof=4 sizeof(drm_mode_get_encoder)=20, alignof=4 sizeof(drm_mode_modeinfo)=68, alignof=4 Fortuituously we can insert explicit padding to the tail of our structures without breaking ABI. Reported-by: Pavel Roskin <proski@gnu.org> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Dave Airlie <airlied@redhat.com> Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com> |
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drm_fourcc.h | ||
drm_mode.h | ||
drm_sarea.h | ||
drm.h | ||
exynos_drm.h | ||
i810_drm.h | ||
i915_drm.h | ||
Kbuild | ||
mga_drm.h | ||
msm_drm.h | ||
nouveau_drm.h | ||
omap_drm.h | ||
qxl_drm.h | ||
r128_drm.h | ||
radeon_drm.h | ||
savage_drm.h | ||
sis_drm.h | ||
tegra_drm.h | ||
via_drm.h | ||
vmwgfx_drm.h |