From: Kees Cook <keescook@chromium.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: Kees Cook <keescook@chromium.org>,
Jakub Kicinski <kuba@kernel.org>,
Justin Iurman <justin.iurman@uliege.be>,
Eric Dumazet <edumazet@google.com>,
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] ipv6: ioam: Replace 0-length array with flexible array
Date: Thu, 5 Jan 2023 14:21:16 -0800 [thread overview]
Message-ID: <20230105222115.never.661-kees@kernel.org> (raw)
Zero-length arrays are deprecated[1]. Replace struct ioam6_trace_hdr's
"data" 0-length array with a flexible array. Detected with GCC 13,
using -fstrict-flex-arrays=3:
net/ipv6/ioam6_iptunnel.c: In function 'ioam6_build_state':
net/ipv6/ioam6_iptunnel.c:194:37: warning: array subscript <unknown> is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=]
194 | tuninfo->traceh.data[trace->remlen * 4] = IPV6_TLV_PADN;
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
In file included from include/linux/ioam6.h:11,
from net/ipv6/ioam6_iptunnel.c:13:
include/uapi/linux/ioam6.h:130:17: note: while referencing 'data'
130 | __u8 data[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: Jakub Kicinski <kuba@kernel.org>
Cc: Justin Iurman <justin.iurman@uliege.be>
Cc: Eric Dumazet <edumazet@google.com>
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/ioam6.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/uapi/linux/ioam6.h b/include/uapi/linux/ioam6.h
index ac4de376f0ce..8f72b24fefb3 100644
--- a/include/uapi/linux/ioam6.h
+++ b/include/uapi/linux/ioam6.h
@@ -127,7 +127,7 @@ struct ioam6_trace_hdr {
#endif
#define IOAM6_TRACE_DATA_SIZE_MAX 244
- __u8 data[0];
+ __u8 data[];
} __attribute__((packed));
#endif /* _UAPI_LINUX_IOAM6_H */
--
2.34.1
next reply other threads:[~2023-01-05 22:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-05 22:21 Kees Cook [this message]
2023-01-06 16:03 ` [PATCH] ipv6: ioam: Replace 0-length array with flexible array Gustavo A. R. Silva
2023-01-06 20:22 ` Justin Iurman
2023-01-07 3:40 ` patchwork-bot+netdevbpf
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