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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1fa0949bed
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2011 Nokia Corporation
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* Copyright (C) 2011 Intel Corporation
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*
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* Author:
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* Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
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* <dmitry.kasatkin@intel.com>
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*/
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#ifndef _DIGSIG_H
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#define _DIGSIG_H
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#include <linux/key.h>
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enum pubkey_algo {
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PUBKEY_ALGO_RSA,
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PUBKEY_ALGO_MAX,
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};
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enum digest_algo {
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DIGEST_ALGO_SHA1,
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DIGEST_ALGO_SHA256,
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DIGEST_ALGO_MAX
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};
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struct pubkey_hdr {
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uint8_t version; /* key format version */
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uint32_t timestamp; /* key made, always 0 for now */
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uint8_t algo;
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uint8_t nmpi;
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char mpi[];
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} __packed;
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struct signature_hdr {
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uint8_t version; /* signature format version */
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uint32_t timestamp; /* signature made */
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uint8_t algo;
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uint8_t hash;
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uint8_t keyid[8];
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uint8_t nmpi;
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char mpi[];
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} __packed;
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#if defined(CONFIG_SIGNATURE) || defined(CONFIG_SIGNATURE_MODULE)
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int digsig_verify(struct key *keyring, const char *sig, int siglen,
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const char *digest, int digestlen);
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#else
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static inline int digsig_verify(struct key *keyring, const char *sig,
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int siglen, const char *digest, int digestlen)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_SIGNATURE */
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#endif /* _DIGSIG_H */
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