Commit d9a01959 authored by Kees Cook's avatar Kees Cook Committed by Ingo Molnar
Browse files

x86/platform/uv: Annotate struct uv_rtc_timer_head with __counted_by 

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

Found with Coccinelle:

  https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci



Add __counted_by for struct uv_rtc_timer_head.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarGustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175151.work.118-kees@kernel.org
parent ec2f16f1

arch/x86/platform/uv/uv_time.c

+1 −1
Original line number Diff line number Diff line
@@ -53,7 +53,7 @@ struct uv_rtc_timer_head { 
	struct {

		int	lcpu;		/* systemwide logical cpu number */

		u64	expires;	/* next timer expiration for this cpu */

	} cpu[];

	} cpu[] __counted_by(ncpus);

};



/*