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From: Kees Cook <keescook@chromium.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: Kees Cook <keescook@chromium.org>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	David Ahern <dsahern@kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-hardening@vger.kernel.org
Subject: [PATCH] net: ipv6: rpl_iptunnel: Replace 0-length arrays with flexible arrays
Date: Thu,  5 Jan 2023 14:15:37 -0800	[thread overview]
Message-ID: <20230105221533.never.711-kees@kernel.org> (raw)

Zero-length arrays are deprecated[1]. Replace struct ipv6_rpl_sr_hdr's
"segments" union of 0-length arrays with flexible arrays. Detected with
GCC 13, using -fstrict-flex-arrays=3:

In function 'rpl_validate_srh',
    inlined from 'rpl_build_state' at ../net/ipv6/rpl_iptunnel.c:96:7:
../net/ipv6/rpl_iptunnel.c:60:28: warning: array subscript <unknown> is outside array bounds of 'struct in6_addr[0]' [-Warray-bounds=]
   60 |         if (ipv6_addr_type(&srh->rpl_segaddr[srh->segments_left - 1]) &
      |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../include/net/rpl.h:12,
                 from ../net/ipv6/rpl_iptunnel.c:13:
../include/uapi/linux/rpl.h: In function 'rpl_build_state':
../include/uapi/linux/rpl.h:40:33: note: while referencing 'addr'
   40 |                 struct in6_addr addr[0];
      |                                 ^~~~

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: David Ahern <dsahern@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 include/uapi/linux/rpl.h | 4 ++--
 net/ipv6/rpl_iptunnel.c  | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/rpl.h b/include/uapi/linux/rpl.h
index 708adddf9f13..7c8970e5b84b 100644
--- a/include/uapi/linux/rpl.h
+++ b/include/uapi/linux/rpl.h
@@ -37,8 +37,8 @@ struct ipv6_rpl_sr_hdr {
 #endif
 
 	union {
-		struct in6_addr addr[0];
-		__u8 data[0];
+		__DECLARE_FLEX_ARRAY(struct in6_addr, addr);
+		__DECLARE_FLEX_ARRAY(__u8, data);
 	} segments;
 } __attribute__((packed));
 
diff --git a/net/ipv6/rpl_iptunnel.c b/net/ipv6/rpl_iptunnel.c
index ff691d9f4a04..b1c028df686e 100644
--- a/net/ipv6/rpl_iptunnel.c
+++ b/net/ipv6/rpl_iptunnel.c
@@ -13,7 +13,7 @@
 #include <net/rpl.h>
 
 struct rpl_iptunnel_encap {
-	struct ipv6_rpl_sr_hdr srh[0];
+	DECLARE_FLEX_ARRAY(struct ipv6_rpl_sr_hdr, srh);
 };
 
 struct rpl_lwt {
-- 
2.34.1


             reply	other threads:[~2023-01-05 22:15 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-05 22:15 Kees Cook [this message]
2023-01-06 16:00 ` [PATCH] net: ipv6: rpl_iptunnel: Replace 0-length arrays with flexible arrays Gustavo A. R. Silva
2023-01-06 16:16 ` David Ahern
2023-01-07  3:40 ` patchwork-bot+netdevbpf

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