From 7d9642311b6d9d319a6948581244561d2a0890a1 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Mon, 21 Aug 2023 10:40:09 -0300 Subject: [PATCH] perf bpf augmented_raw_syscalls: Add an assert to make sure sizeof(augmented_arg->value) is a power of two. Similar to what was done in the previous cset for sizeof(saddr), we need to make sure sizeof(augmented_arg->value) is a power of two to do bounds checking using &=: augmented_len &= sizeof(augmented_arg->value) - 1; Suggested-by: Ian Rogers Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/lkml/ZONrPo0NSqdbXiGx@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c index 43549b63b433d..90ce22f9c1a94 100644 --- a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c +++ b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c @@ -160,6 +160,7 @@ unsigned int augmented_arg__read_str(struct augmented_arg *augmented_arg, const */ if (string_len > 0) { augmented_len -= sizeof(augmented_arg->value) - string_len; + _Static_assert(is_power_of_2(sizeof(augmented_arg->value)), "sizeof(augmented_arg->value) needs to be a power of two"); augmented_len &= sizeof(augmented_arg->value) - 1; augmented_arg->size = string_len; } else { -- 2.30.2