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Message-Id: <20231003231818.work.883-kees@kernel.org> Date: Tue, 3 Oct 2023 16:18:18 -0700 From: Kees Cook <keescook@...omium.org> To: David Ahern <dsahern@...nel.org> Cc: Kees Cook <keescook@...omium.org>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, netdev@...r.kernel.org, llvm@...ts.linux.dev, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] nexthop: Annotate struct nh_notifier_res_table_info 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 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 nh_notifier_res_table_info. Cc: David Ahern <dsahern@...nel.org> Cc: "David S. Miller" <davem@...emloft.net> Cc: Eric Dumazet <edumazet@...gle.com> Cc: Jakub Kicinski <kuba@...nel.org> Cc: Paolo Abeni <pabeni@...hat.com> Cc: Nathan Chancellor <nathan@...nel.org> Cc: Nick Desaulniers <ndesaulniers@...gle.com> Cc: Tom Rix <trix@...hat.com> Cc: netdev@...r.kernel.org Cc: llvm@...ts.linux.dev Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <keescook@...omium.org> --- include/net/nexthop.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/nexthop.h b/include/net/nexthop.h index 09f9a732e640..8f5a2ab45920 100644 --- a/include/net/nexthop.h +++ b/include/net/nexthop.h @@ -200,7 +200,7 @@ struct nh_notifier_res_bucket_info { struct nh_notifier_res_table_info { u16 num_nh_buckets; - struct nh_notifier_single_info nhs[]; + struct nh_notifier_single_info nhs[] __counted_by(num_nh_buckets); }; struct nh_notifier_info { -- 2.34.1
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