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).
As found with Coccinelle[1], add __counted_by for struct uv_rtc_timer_head. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Steve Wahl <steve.w...@hpe.com> Cc: Mike Travis <mike.tra...@hpe.com> Cc: Dimitri Sivanich <dimitri.sivan...@hpe.com> Cc: Russ Anderson <russ.ander...@hpe.com> Cc: Darren Hart <dvh...@infradead.org> Cc: Andy Shevchenko <a...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Ingo Molnar <mi...@redhat.com> Cc: Borislav Petkov <b...@alien8.de> Cc: Dave Hansen <dave.han...@linux.intel.com> Cc: x...@kernel.org Cc: "H. Peter Anvin" <h...@zytor.com> Cc: platform-driver-...@vger.kernel.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- arch/x86/platform/uv/uv_time.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c index 54663f3e00cb..ff5afc8a5a41 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); }; /* -- 2.34.1
