Re: [PATCH 02/14] ipv4/igmp: Annotate struct ip_sf_socklist with __counted_by
From: Gustavo A. R. Silva <hidden>
Date: 2023-09-22 17:50:02
Also in:
linux-hardening, linux-hyperv, linux-rdma, lkml, llvm
On 9/22/23 11:28, Kees Cook wrote:
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 ip_sf_socklist. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: "David S. Miller" <davem@davemloft.net> Cc: Martin KaFai Lau <martin.lau@kernel.org> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> Cc: Eric Dumazet <edumazet@google.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Kees Cook <redacted>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Thanks -- Gustavo
quoted hunk ↗ jump to hunk
--- include/linux/igmp.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/include/linux/igmp.h b/include/linux/igmp.h index ebf4349a53af..5171231f70a8 100644 --- a/include/linux/igmp.h +++ b/include/linux/igmp.h@@ -39,7 +39,7 @@ struct ip_sf_socklist { unsigned int sl_max; unsigned int sl_count; struct rcu_head rcu; - __be32 sl_addr[]; + __be32 sl_addr[] __counted_by(sl_max); }; #define IP_SFBLOCK 10 /* allocate this many at once */