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ipv4: Annotate struct fib_info with __counted_by

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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 fib_info.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: David Ahern <dsahern@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922172858.3822653-1-keescook@chromium.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kees Cook 2023-09-22 10:28:43 -07:00 committed by Jakub Kicinski
parent 436e5f758d
commit 5b98fd5dc1
1 changed files with 1 additions and 1 deletions
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2
include/net/ip_fib.h
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@ -156,7 +156,7 @@ struct fib_info {
bool nh_updated;
struct nexthop *nh;
struct rcu_head rcu;
struct fib_nh fib_nh[];
struct fib_nh fib_nh[] __counted_by(fib_nhs);
};