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nexthop: Annotate struct nh_res_table 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 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.

Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20231003231813.work.042-kees@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kees Cook 2023-10-03 16:18:13 -07:00 committed by Jakub Kicinski
parent b374d52298
commit 2253bb3ff2
1 changed files with 1 additions and 1 deletions
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2
include/net/nexthop.h
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@ -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 {