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Message-Id: <20220927003927.1942170-1-keescook@chromium.org> Date: Mon, 26 Sep 2022 17:39:27 -0700 From: Kees Cook <keescook@...omium.org> To: Evgeniy Polyakov <zbr@...emap.net> Cc: Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] w1: Split memcpy() of struct cn_msg 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: Evgeniy Polyakov <zbr@...emap.net> Signed-off-by: Kees Cook <keescook@...omium.org> --- drivers/w1/w1_netlink.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c index fa490aa4407c..db110cc442b1 100644 --- a/drivers/w1/w1_netlink.c +++ b/drivers/w1/w1_netlink.c @@ -611,7 +611,8 @@ static void w1_cn_callback(struct cn_msg *cn, struct netlink_skb_parms *nsp) } atomic_set(&block->refcnt, 1); block->portid = nsp->portid; - memcpy(&block->request_cn, cn, sizeof(*cn) + cn->len); + block->request_cn = *cn; + memcpy(block->request_cn.data, cn->data, cn->len); node = (struct w1_cb_node *)(block->request_cn.data + cn->len); /* Sneeky, when not bundling, reply_size is the allocated space -- 2.34.1
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