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a334319f | 1 | /* Copyright (C) 1998, 2000, 2003, 2004 Free Software Foundation, Inc. |
9ffbb612 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
9ffbb612 UD |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
9ffbb612 | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
9ffbb612 UD |
18 | |
19 | #include <errno.h> | |
9ffbb612 | 20 | #include <unistd.h> |
85bd6331 | 21 | #include <setxid.h> |
d5ef95c8 | 22 | #include <linux/posix_types.h> |
a334319f | 23 | #include "kernel-features.h" |
2edb61e3 | 24 | |
9ffbb612 | 25 | |
313fed01 | 26 | #ifdef __NR_setuid32 |
313fed01 UD |
27 | # if __ASSUME_32BITUIDS == 0 |
28 | /* This variable is shared with all files that need to check for 32bit | |
29 | uids. */ | |
30 | extern int __libc_missing_32bit_uids; | |
31 | # endif | |
32 | #endif /* __NR_setuid32 */ | |
33 | ||
9ffbb612 UD |
34 | int |
35 | __setuid (uid_t uid) | |
36 | { | |
2edb61e3 UD |
37 | int result; |
38 | ||
39 | #if __ASSUME_32BITUIDS > 0 && defined __NR_setuid32 | |
85bd6331 | 40 | result = INLINE_SETXID_SYSCALL (setuid32, 1, uid); |
313fed01 UD |
41 | #else |
42 | # ifdef __NR_setuid32 | |
cd090f71 | 43 | if (__libc_missing_32bit_uids <= 0) |
313fed01 | 44 | { |
313fed01 UD |
45 | int saved_errno = errno; |
46 | ||
85bd6331 | 47 | result = INLINE_SETXID_SYSCALL (setuid32, 1, uid); |
2edb61e3 UD |
48 | if (result == 0) |
49 | goto out; | |
50 | if (errno != ENOSYS) | |
313fed01 UD |
51 | return result; |
52 | ||
53 | __set_errno (saved_errno); | |
54 | __libc_missing_32bit_uids = 1; | |
55 | } | |
56 | # endif /* __NR_setuid32 */ | |
57 | ||
9ffbb612 UD |
58 | if (uid == (uid_t) ~0 |
59 | || uid != (uid_t) ((__kernel_uid_t) uid)) | |
60 | { | |
61 | __set_errno (EINVAL); | |
62 | return -1; | |
63 | } | |
64 | ||
85bd6331 | 65 | result = INLINE_SETXID_SYSCALL (setuid, 1, uid); |
2edb61e3 UD |
66 | # ifdef __NR_setuid32 |
67 | out: | |
68 | # endif | |
69 | #endif | |
70 | ||
2edb61e3 | 71 | return result; |
9ffbb612 | 72 | } |
2edb61e3 | 73 | #ifndef __setuid |
9ffbb612 | 74 | weak_alias (__setuid, setuid) |
2edb61e3 | 75 | #endif |