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flow_offload: Annotate struct flow_action_entry 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 flow_action_entry.

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>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kees Cook 2023-10-03 16:18:33 -07:00 committed by David S. Miller
parent b3783e5efd
commit 99474727d5
1 changed files with 1 additions and 1 deletions
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2
include/net/flow_offload.h
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@ -333,7 +333,7 @@ struct flow_action_entry {
struct flow_action {
unsigned int num_entries;
struct flow_action_entry entries[];
struct flow_action_entry entries[] __counted_by(num_entries);
};
static inline bool flow_action_has_entries(const struct flow_action *action)