From: Kees Cook <keescook@chromium•org>
To: David Ahern <dsahern@kernel•org>
Cc: Kees Cook <keescook@chromium•org>,
"David S. Miller" <davem@davemloft•net>,
Eric Dumazet <edumazet@google•com>,
Jakub Kicinski <kuba@kernel•org>, Paolo Abeni <pabeni@redhat•com>,
netdev@vger•kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel•org>,
Nathan Chancellor <nathan@kernel•org>,
Nick Desaulniers <ndesaulniers@google•com>,
Tom Rix <trix@redhat•com>,
linux-kernel@vger•kernel.org, linux-hardening@vger•kernel.org,
llvm@lists•linux.dev
Subject: [PATCH] nexthop: Annotate struct nh_res_table with __counted_by
Date: Tue, 3 Oct 2023 16:18:13 -0700 [thread overview]
Message-ID: <20231003231813.work.042-kees@kernel.org> (raw)
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_res_table.
Cc: David Ahern <dsahern@kernel•org>
Cc: "David S. Miller" <davem@davemloft•net>
Cc: Eric Dumazet <edumazet@google•com>
Cc: Jakub Kicinski <kuba@kernel•org>
Cc: Paolo Abeni <pabeni@redhat•com>
Cc: netdev@vger•kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium•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 5dc4b4bba8a5..09f9a732e640 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h
@@ -92,7 +92,7 @@ struct nh_res_table {
u32 unbalanced_timer;
u16 num_nh_buckets;
- struct nh_res_bucket nh_buckets[];
+ struct nh_res_bucket nh_buckets[] __counted_by(num_nh_buckets);
};
struct nh_grp_entry {
--
2.34.1
next reply other threads:[~2023-10-03 23:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-03 23:18 Kees Cook [this message]
2023-10-03 23:36 ` [PATCH] nexthop: Annotate struct nh_res_table with __counted_by Gustavo A. R. Silva
2023-10-03 23:36 ` David Ahern
2023-10-06 1:40 ` patchwork-bot+netdevbpf
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