From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Bodo Stroesser <bostroesser@gmail.com>
Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-hardening@vger.kernel.org
Subject: [PATCH][next] uapi: target: Replace fake flex-array with flexible-array member
Date: Fri, 17 Mar 2023 10:59:48 -0600 [thread overview]
Message-ID: <ZBSchMvTdl7VObKI@work> (raw)
Zero-length arrays as fake flexible arrays are deprecated and we are
moving towards adopting C99 flexible-array members instead.
Address the following warning found with GCC-13 and
-fstrict-flex-arrays=3 enabled:
CC drivers/target/target_core_user.o
drivers/target/target_core_user.c: In function ‘queue_cmd_ring’:
drivers/target/target_core_user.c:1096:15: warning: array subscript 0 is outside array bounds of ‘struct iovec[0]’ [-Warray-bounds=]
1096 | iov = &entry->req.iov[0];
| ^~~~~~~~~~~~~~~~~~
In file included from drivers/target/target_core_user.c:31:
./include/uapi/linux/target_core_user.h:122:38: note: while referencing ‘iov’
122 | struct iovec iov[0];
| ^~~
This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].
Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/270
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
include/uapi/linux/target_core_user.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/uapi/linux/target_core_user.h b/include/uapi/linux/target_core_user.h
index fbd8ca67e107..f925a77f19ed 100644
--- a/include/uapi/linux/target_core_user.h
+++ b/include/uapi/linux/target_core_user.h
@@ -119,7 +119,7 @@ struct tcmu_cmd_entry {
__u64 cdb_off;
__u64 __pad1;
__u64 __pad2;
- struct iovec iov[0];
+ __DECLARE_FLEX_ARRAY(struct iovec, iov);
} req;
struct {
__u8 scsi_status;
--
2.34.1
next reply other threads:[~2023-03-17 16:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-17 16:59 Gustavo A. R. Silva [this message]
2023-03-18 13:00 ` [PATCH][next] uapi: target: Replace fake flex-array with flexible-array member Bodo Stroesser
2023-03-20 18:33 ` Kees Cook
2023-03-24 20:59 ` Martin K. Petersen
2023-04-03 2:15 ` Martin K. Petersen
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