From nobody Mon Nov 25 21:38:16 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 27138217916; Thu, 24 Oct 2024 21:14:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729804475; cv=none; b=uuGyawTuCn7fOPPzdoftQuut5thF/p+6394ir9tR0c/hoP110P26OR4kqpAoaIrx0kOOsaxCEc7nUUKnZZG2utcS6OzogYrZ/Fxfk3qHBmJBz322IO7iARw/TMIaEEpBxDaR1GXwUD4qJqstzBSOV6kn3+Ih1eJB3z5NMnuzhoE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729804475; c=relaxed/simple; bh=RPrXxToPed4P2qJ+35T7mOSrAPsKyzWjCEbw6Myhtug=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=gjeoYLrRjmeXHs+4hKadWKsffcCk+YnQJg3T/vR9sNrHwfGsJ+C7udtSg9aEXhLVYaIzcNRRTkWyIb41dO82S/Oynx4Cc/Um2gbhe9kdqXdIpmL9pELCVOyA4byqJ2On75zVeN9RSgdgM2R4gh5t2s36nimXWBsn6QaPIME0KIc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I+EJiAOG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I+EJiAOG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71E4AC4CEC7; Thu, 24 Oct 2024 21:14:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729804474; bh=RPrXxToPed4P2qJ+35T7mOSrAPsKyzWjCEbw6Myhtug=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=I+EJiAOGA8nDEX1APRxBItQ26lqqHozHlZlKG+URE0XbdSp2SKozjdFYWQlaabPho hJywnb/DsdCog5/XE5CtCySGmzikp5p6cnjqBOEF70YR1sr0aAhax4FKaciHjDBF/N Wd+1C6FHb4b1jumPp/Qks7mTzPPwIf66lYWJzYf92ce+9xM2VKXC0UE9QE9DncA0+t JQY5iKJ8BQOkltMyeHu8E5qFmlMYsR4naQhNBL2Th6lONjoRykC7Uc3yEqAeUVa955 nL5IwuV/PUHOmjS1kz3uYpbTLCiXzBpzC6/IuO1hn+DpioRMqA1ee5Cxzp3+UHywaf qDdVDfqJn6XZw== Date: Thu, 24 Oct 2024 15:14:31 -0600 From: "Gustavo A. R. Silva" To: Andrew Lunn , Johannes Berg , David Ahern , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org, Kees Cook Subject: [PATCH v2 4/4][next] uapi: net: Avoid -Wflex-array-member-not-at-end warnings Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" -Wflex-array-member-not-at-end was introduced in GCC-14, and we are getting ready to enable it, globally. Address the following warnings by changing the type of the middle struct members in a couple of composite structs, which are currently causing trouble, from `struct sockaddr` to `struct __kernel_sockaddr_legacy` in=20 UAPI, and `struct sockaddr_legacy` for the rest of the kernel code. include/uapi/linux/route.h:33:25: warning: structure containing a flexible = array member is not at the end of another structure [-Wflex-array-member-no= t-at-end] include/uapi/linux/route.h:34:25: warning: structure containing a flexible = array member is not at the end of another structure [-Wflex-array-member-no= t-at-end] include/uapi/linux/route.h:35:25: warning: structure containing a flexible = array member is not at the end of another structure [-Wflex-array-member-no= t-at-end include/net/compat.h:34:25: warning: structure containing a flexible array = member is not at the end of another structure [-Wflex-array-member-not-at-e= nd] include/net/compat.h:35:25: warning: structure containing a flexible array = member is not at the end of another structure [-Wflex-array-member-not-at-e= nd] Also, update some related code, accordingly. Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook --- include/net/compat.h | 30 +++++++++++++++--------------- include/uapi/linux/route.h | 28 ++++++++++++++-------------- net/appletalk/ddp.c | 2 +- net/ipv4/af_inet.c | 2 +- net/ipv4/fib_frontend.c | 2 +- 5 files changed, 32 insertions(+), 32 deletions(-) diff --git a/include/net/compat.h b/include/net/compat.h index 84c163f40f38..89e891d8dcf3 100644 --- a/include/net/compat.h +++ b/include/net/compat.h @@ -29,21 +29,21 @@ struct compat_cmsghdr { }; =20 struct compat_rtentry { - u32 rt_pad1; - struct sockaddr rt_dst; /* target address */ - struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ - struct sockaddr rt_genmask; /* target network mask (IP) */ - unsigned short rt_flags; - short rt_pad2; - u32 rt_pad3; - unsigned char rt_tos; - unsigned char rt_class; - short rt_pad4; - short rt_metric; /* +1 for binary compatibility! */ - compat_uptr_t rt_dev; /* forcing the device at add */ - u32 rt_mtu; /* per route MTU/Window */ - u32 rt_window; /* Window clamping */ - unsigned short rt_irtt; /* Initial RTT */ + u32 rt_pad1; + struct sockaddr_legacy rt_dst; /* target address */ + struct sockaddr_legacy rt_gateway; /* gateway addr (RTF_GATEWAY) */ + struct sockaddr_legacy rt_genmask; /* target network mask (IP) */ + unsigned short rt_flags; + short rt_pad2; + u32 rt_pad3; + unsigned char rt_tos; + unsigned char rt_class; + short rt_pad4; + short rt_metric; /* +1 for binary compatibility! */ + compat_uptr_t rt_dev; /* forcing the device at add */ + u32 rt_mtu; /* per route MTU/Window */ + u32 rt_window; /* Window clamping */ + unsigned short rt_irtt; /* Initial RTT */ }; =20 int __get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr *msg, diff --git a/include/uapi/linux/route.h b/include/uapi/linux/route.h index a0de9a7331a2..43fd79f90a47 100644 --- a/include/uapi/linux/route.h +++ b/include/uapi/linux/route.h @@ -29,22 +29,22 @@ =20 /* This structure gets passed by the SIOCADDRT and SIOCDELRT calls. */ struct rtentry { - unsigned long rt_pad1; - struct sockaddr rt_dst; /* target address */ - struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ - struct sockaddr rt_genmask; /* target network mask (IP) */ - unsigned short rt_flags; - short rt_pad2; - unsigned long rt_pad3; - void *rt_pad4; - short rt_metric; /* +1 for binary compatibility! */ - char __user *rt_dev; /* forcing the device at add */ - unsigned long rt_mtu; /* per route MTU/Window */ + unsigned long rt_pad1; + struct __kernel_sockaddr_legacy rt_dst; /* target address */ + struct __kernel_sockaddr_legacy rt_gateway; /* gateway addr (RTF_GATEWAY)= */ + struct __kernel_sockaddr_legacy rt_genmask; /* target network mask (IP) */ + unsigned short rt_flags; + short rt_pad2; + unsigned long rt_pad3; + void *rt_pad4; + short rt_metric; /* +1 for binary compatibility! */ + char __user *rt_dev; /* forcing the device at add */ + unsigned long rt_mtu; /* per route MTU/Window */ #ifndef __KERNEL__ -#define rt_mss rt_mtu /* Compatibility :-( */ +#define rt_mss rt_mtu /* Compatibility :-( */ #endif - unsigned long rt_window; /* Window clamping */ - unsigned short rt_irtt; /* Initial RTT */ + unsigned long rt_window; /* Window clamping */ + unsigned short rt_irtt; /* Initial RTT */ }; =20 =20 diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c index b068651984fe..aac82a4af36f 100644 --- a/net/appletalk/ddp.c +++ b/net/appletalk/ddp.c @@ -1832,7 +1832,7 @@ static int atalk_compat_routing_ioctl(struct sock *sk= , unsigned int cmd, struct rtentry rt; =20 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, - 3 * sizeof(struct sockaddr)) || + 3 * sizeof(struct sockaddr_legacy)) || get_user(rt.rt_flags, &ur->rt_flags) || get_user(rt.rt_metric, &ur->rt_metric) || get_user(rt.rt_mtu, &ur->rt_mtu) || diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 8095e82de808..3beb52261b4b 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1019,7 +1019,7 @@ static int inet_compat_routing_ioctl(struct sock *sk,= unsigned int cmd, struct rtentry rt; =20 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, - 3 * sizeof(struct sockaddr)) || + 3 * sizeof(struct sockaddr_legacy)) || get_user(rt.rt_flags, &ur->rt_flags) || get_user(rt.rt_metric, &ur->rt_metric) || get_user(rt.rt_mtu, &ur->rt_mtu) || diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index 53bd26315df5..88c7a79946f2 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -452,7 +452,7 @@ int fib_validate_source(struct sk_buff *skb, __be32 src= , __be32 dst, itag); } =20 -static inline __be32 sk_extract_addr(struct sockaddr *addr) +static inline __be32 sk_extract_addr(struct sockaddr_legacy *addr) { return ((struct sockaddr_in *) addr)->sin_addr.s_addr; } --=20 2.34.1