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Message-Id: <20220927004033.1942992-1-keescook@chromium.org> Date: Mon, 26 Sep 2022 17:40:33 -0700 From: Kees Cook <keescook@...omium.org> To: Ido Schimmel <idosch@...dia.com> Cc: Kees Cook <keescook@...omium.org>, Petr Machata <petrm@...dia.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] mlxsw: core_acl_flex_actions: Split memcpy() of struct flow_action_cookie flexible array To work around a misbehavior of the compiler's ability to see into composite flexible array structs (as detailed in the coming memcpy() hardening series[1]), split the memcpy() of the header and the payload so no false positive run-time overflow warning will be generated. [1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org Cc: Ido Schimmel <idosch@...dia.com> Cc: Petr Machata <petrm@...dia.com> Cc: "David S. Miller" <davem@...emloft.net> Cc: Eric Dumazet <edumazet@...gle.com> Cc: Jakub Kicinski <kuba@...nel.org> Cc: Paolo Abeni <pabeni@...hat.com> Cc: netdev@...r.kernel.org Signed-off-by: Kees Cook <keescook@...omium.org> --- drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c index 636db9a87457..9dfe7148199f 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c +++ b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c @@ -737,8 +737,9 @@ mlxsw_afa_cookie_create(struct mlxsw_afa *mlxsw_afa, if (!cookie) return ERR_PTR(-ENOMEM); refcount_set(&cookie->ref_count, 1); - memcpy(&cookie->fa_cookie, fa_cookie, - sizeof(*fa_cookie) + fa_cookie->cookie_len); + cookie->fa_cookie = *fa_cookie; + memcpy(cookie->fa_cookie.cookie, fa_cookie->cookie, + fa_cookie->cookie_len); err = rhashtable_insert_fast(&mlxsw_afa->cookie_ht, &cookie->ht_node, mlxsw_afa_cookie_ht_params); -- 2.34.1
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