| Message ID | ZBSu2QsUJy31kjSE@work (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [next] drm/i915/uapi: Replace fake flex-array with flexible-array member | expand |
On Fri, Mar 17, 2023 at 12:18:01PM -0600, Gustavo A. R. Silva wrote: > Zero-length arrays as fake flexible arrays are deprecated and we are > moving towards adopting C99 flexible-array members instead. > > Address the following warning found with GCC-13 and > -fstrict-flex-arrays=3 enabled: > drivers/gpu/drm/i915/gem/i915_gem_context.c: In function ‘set_proto_ctx_engines.isra’: > drivers/gpu/drm/i915/gem/i915_gem_context.c:769:41: warning: array subscript n is outside array bounds of ‘struct i915_engine_class_instance[0]’ [-Warray-bounds=] > 769 | if (copy_from_user(&ci, &user->engines[n], sizeof(ci))) { > | ^~~~~~~~~~~~~~~~~ > ./include/uapi/drm/i915_drm.h:2494:43: note: while referencing ‘engines’ > 2494 | struct i915_engine_class_instance engines[0]; > > This helps with the ongoing efforts to tighten the FORTIFY_SOURCE > routines on memcpy() and help us make progress towards globally > enabling -fstrict-flex-arrays=3 [1]. > > Link: https://github.com/KSPP/linux/issues/21 > Link: https://github.com/KSPP/linux/issues/271 > Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1] > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org>
On 20/03/2023 17:36, Kees Cook wrote: > On Fri, Mar 17, 2023 at 12:18:01PM -0600, Gustavo A. R. Silva wrote: >> Zero-length arrays as fake flexible arrays are deprecated and we are >> moving towards adopting C99 flexible-array members instead. >> >> Address the following warning found with GCC-13 and >> -fstrict-flex-arrays=3 enabled: >> drivers/gpu/drm/i915/gem/i915_gem_context.c: In function ‘set_proto_ctx_engines.isra’: >> drivers/gpu/drm/i915/gem/i915_gem_context.c:769:41: warning: array subscript n is outside array bounds of ‘struct i915_engine_class_instance[0]’ [-Warray-bounds=] >> 769 | if (copy_from_user(&ci, &user->engines[n], sizeof(ci))) { >> | ^~~~~~~~~~~~~~~~~ >> ./include/uapi/drm/i915_drm.h:2494:43: note: while referencing ‘engines’ >> 2494 | struct i915_engine_class_instance engines[0]; >> >> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE >> routines on memcpy() and help us make progress towards globally >> enabling -fstrict-flex-arrays=3 [1]. >> >> Link: https://github.com/KSPP/linux/issues/21 >> Link: https://github.com/KSPP/linux/issues/271 >> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1] >> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> > > Reviewed-by: Kees Cook <keescook@chromium.org> Flexible array member is even consistent with the rest of our uapi, pushed to drm-intel-gt-next, thanks! Regards, Tvrtko
Hi all, Friendly ping: who can take this, please?
On Thu, 30 Mar 2023, "Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
> Friendly ping: who can take this, please?
On 3/31/23 01:02, Jani Nikula wrote: > On Thu, 30 Mar 2023, "Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote: >> Friendly ping: who can take this, please?
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index 8df261c5ab9b..5e458d6f2895 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -2491,7 +2491,7 @@ struct i915_context_param_engines { #define I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE 0 /* see i915_context_engines_load_balance */ #define I915_CONTEXT_ENGINES_EXT_BOND 1 /* see i915_context_engines_bond */ #define I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT 2 /* see i915_context_engines_parallel_submit */ - struct i915_engine_class_instance engines[0]; + struct i915_engine_class_instance engines[]; } __attribute__((packed)); #define I915_DEFINE_CONTEXT_PARAM_ENGINES(name__, N__) struct { \
Zero-length arrays as fake flexible arrays are deprecated and we are moving towards adopting C99 flexible-array members instead. Address the following warning found with GCC-13 and -fstrict-flex-arrays=3 enabled: drivers/gpu/drm/i915/gem/i915_gem_context.c: In function ‘set_proto_ctx_engines.isra’: drivers/gpu/drm/i915/gem/i915_gem_context.c:769:41: warning: array subscript n is outside array bounds of ‘struct i915_engine_class_instance[0]’ [-Warray-bounds=] 769 | if (copy_from_user(&ci, &user->engines[n], sizeof(ci))) { | ^~~~~~~~~~~~~~~~~ ./include/uapi/drm/i915_drm.h:2494:43: note: while referencing ‘engines’ 2494 | struct i915_engine_class_instance engines[0]; This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines on memcpy() and help us make progress towards globally enabling -fstrict-flex-arrays=3 [1]. Link: https://github.com/KSPP/linux/issues/21 Link: https://github.com/KSPP/linux/issues/271 Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1] Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> --- include/uapi/drm/i915_drm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)