Merge tag 'x86_urgent_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / security / keys / compat_dh.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 32-bit compatibility syscall for 64-bit systems for DH operations
3  *
4  * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de>
5  */
6
7 #include <linux/uaccess.h>
8
9 #include "internal.h"
10
11 /*
12  * Perform the DH computation or DH based key derivation.
13  *
14  * If successful, 0 will be returned.
15  */
16 long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
17                               char __user *buffer, size_t buflen,
18                               struct compat_keyctl_kdf_params __user *kdf)
19 {
20         struct keyctl_kdf_params kdfcopy;
21         struct compat_keyctl_kdf_params compat_kdfcopy;
22
23         if (!kdf)
24                 return __keyctl_dh_compute(params, buffer, buflen, NULL);
25
26         if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0)
27                 return -EFAULT;
28
29         kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname);
30         kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo);
31         kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen;
32         memcpy(kdfcopy.__spare, compat_kdfcopy.__spare,
33                sizeof(kdfcopy.__spare));
34
35         return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy);
36 }