Revision e94bd1736f1f60e916a85a80c0b0ebeaae36cce5 authored by Michel Dänzer on 30 November 2016, 08:30:01 UTC, committed by Daniel Vetter on 30 November 2016, 09:13:00 UTC
Fixes oops if userspace calls DRM_IOCTL_GET_CAP for DRM_CAP_PAGE_FLIP_TARGET on a non-KMS device node. (Normal userspace doesn't do that, discovered by syzkaller) Reported-by: Dmitry Vyukov <dvyukov@google.com> Fixes: f837297ad824 ("drm: Add DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags v2") Cc: stable@vger.kernel.org Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161130083002.1520-1-michel@daenzer.net
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Kconfig.ubsan
config ARCH_HAS_UBSAN_SANITIZE_ALL
bool
config ARCH_WANTS_UBSAN_NO_NULL
def_bool n
config UBSAN
bool "Undefined behaviour sanity checker"
help
This option enables undefined behaviour sanity checker
Compile-time instrumentation is used to detect various undefined
behaviours in runtime. Various types of checks may be enabled
via boot parameter ubsan_handle (see: Documentation/ubsan.txt).
config UBSAN_SANITIZE_ALL
bool "Enable instrumentation for the entire kernel"
depends on UBSAN
depends on ARCH_HAS_UBSAN_SANITIZE_ALL
# We build with -Wno-maybe-uninitilzed, but we still want to
# use -Wmaybe-uninitilized in allmodconfig builds.
# So dependsy bellow used to disable this option in allmodconfig
depends on !COMPILE_TEST
default y
help
This option activates instrumentation for the entire kernel.
If you don't enable this option, you have to explicitly specify
UBSAN_SANITIZE := y for the files/directories you want to check for UB.
Enabling this option will get kernel image size increased
significantly.
config UBSAN_ALIGNMENT
bool "Enable checking of pointers alignment"
depends on UBSAN
default y if !HAVE_EFFICIENT_UNALIGNED_ACCESS
help
This option enables detection of unaligned memory accesses.
Enabling this option on architectures that support unaligned
accesses may produce a lot of false positives.
config UBSAN_NULL
bool "Enable checking of null pointers"
depends on UBSAN
default y if !ARCH_WANTS_UBSAN_NO_NULL
help
This option enables detection of memory accesses via a
null pointer.
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