From: Kees Cook Date: Fri, 22 Sep 2023 17:51:51 +0000 (-0700) Subject: x86/platform/uv: Annotate struct uv_rtc_timer_head with __counted_by X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d9a01959d9c954c8fe1d132b52401b0e219e37f6;p=linux.git 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: Kees Cook Signed-off-by: Ingo Molnar Reviewed-by: Gustavo A. R. Silva Link: https://lore.kernel.org/r/20230922175151.work.118-kees@kernel.org --- diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c index 54663f3e00cbd..ff5afc8a5a41e 100644 --- a/arch/x86/platform/uv/uv_time.c +++ b/arch/x86/platform/uv/uv_time.c @@ -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); }; /*