mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
709b2d03bb
commit 92eb6c3060ebe3adf381fd9899451c5b047bb14d upstream. Commit3f69cc6076("crypto: af_alg - Allow arbitrarily long algorithm names") made the kernel start accepting arbitrarily long algorithm names in sockaddr_alg. However, the actual length of the salg_name field stayed at the original 64 bytes. This is broken because the kernel can access indices >= 64 in salg_name, which is undefined behavior -- even though the memory that is accessed is still located within the sockaddr structure. It would only be defined behavior if the array were properly marked as arbitrary-length (either by making it a flexible array, which is the recommended way these days, or by making it an array of length 0 or 1). We can't simply change salg_name into a flexible array, since that would break source compatibility with userspace programs that embed sockaddr_alg into another struct, or (more commonly) declare a sockaddr_alg like 'struct sockaddr_alg sa = { .salg_name = "foo" };'. One solution would be to change salg_name into a flexible array only when '#ifdef __KERNEL__'. However, that would keep userspace without an easy way to actually use the longer algorithm names. Instead, add a new structure 'sockaddr_alg_new' that has the flexible array field, and expose it to both userspace and the kernel. Make the kernel use it correctly in alg_bind(). This addresses the syzbot report "UBSAN: array-index-out-of-bounds in alg_bind" (https://syzkaller.appspot.com/bug?extid=92ead4eb8e26a26d465e). Reported-by: syzbot+92ead4eb8e26a26d465e@syzkaller.appspotmail.com Fixes:3f69cc6076("crypto: af_alg - Allow arbitrarily long algorithm names") Cc: <stable@vger.kernel.org> # v4.12+ Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
|
|
/*
|
|
* if_alg: User-space algorithm interface
|
|
*
|
|
* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#ifndef _LINUX_IF_ALG_H
|
|
#define _LINUX_IF_ALG_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct sockaddr_alg {
|
|
__u16 salg_family;
|
|
__u8 salg_type[14];
|
|
__u32 salg_feat;
|
|
__u32 salg_mask;
|
|
__u8 salg_name[64];
|
|
};
|
|
|
|
/*
|
|
* Linux v4.12 and later removed the 64-byte limit on salg_name[]; it's now an
|
|
* arbitrary-length field. We had to keep the original struct above for source
|
|
* compatibility with existing userspace programs, though. Use the new struct
|
|
* below if support for very long algorithm names is needed. To do this,
|
|
* allocate 'sizeof(struct sockaddr_alg_new) + strlen(algname) + 1' bytes, and
|
|
* copy algname (including the null terminator) into salg_name.
|
|
*/
|
|
struct sockaddr_alg_new {
|
|
__u16 salg_family;
|
|
__u8 salg_type[14];
|
|
__u32 salg_feat;
|
|
__u32 salg_mask;
|
|
__u8 salg_name[];
|
|
};
|
|
|
|
struct af_alg_iv {
|
|
__u32 ivlen;
|
|
__u8 iv[0];
|
|
};
|
|
|
|
/* Socket options */
|
|
#define ALG_SET_KEY 1
|
|
#define ALG_SET_IV 2
|
|
#define ALG_SET_OP 3
|
|
#define ALG_SET_AEAD_ASSOCLEN 4
|
|
#define ALG_SET_AEAD_AUTHSIZE 5
|
|
#define ALG_SET_DRBG_ENTROPY 6
|
|
|
|
/* Operations */
|
|
#define ALG_OP_DECRYPT 0
|
|
#define ALG_OP_ENCRYPT 1
|
|
|
|
#endif /* _LINUX_IF_ALG_H */
|