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a334319f | 1 | /* Copyright (C) 1998, 2000, 2003 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
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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. */ | |
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18 | |
19 | #include <errno.h> | |
0dee6738 | 20 | #include <sys/types.h> |
348ed515 | 21 | #include <sys/fsuid.h> |
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22 | |
23 | #include <sysdep.h> | |
24 | #include <sys/syscall.h> | |
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25 | |
26 | #include <linux/posix_types.h> | |
a334319f | 27 | #include "kernel-features.h" |
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28 | |
29 | #ifdef __NR_setfsuid | |
313fed01 | 30 | |
313fed01 | 31 | # ifdef __NR_setfsuid32 |
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32 | # if __ASSUME_32BITUIDS == 0 |
33 | /* This variable is shared with all files that need to check for 32bit | |
34 | uids. */ | |
359b695d | 35 | extern int __libc_missing_32bit_uids attribute_hidden; |
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36 | # endif |
37 | # endif /* __NR_setfsuid32 */ | |
38 | ||
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39 | int |
40 | setfsuid (uid_t uid) | |
41 | { | |
359b695d | 42 | INTERNAL_SYSCALL_DECL (err); |
313fed01 | 43 | # if __ASSUME_32BITUIDS > 0 |
359b695d | 44 | /* No error checking. */ |
fd54683c | 45 | return INTERNAL_SYSCALL (setfsuid32, err, 1, uid); |
359b695d | 46 | # else |
313fed01 | 47 | # ifdef __NR_setfsuid32 |
cd090f71 | 48 | if (__libc_missing_32bit_uids <= 0) |
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49 | { |
50 | int result; | |
313fed01 | 51 | |
fd54683c | 52 | result = INTERNAL_SYSCALL (setfsuid32, err, 1, uid); |
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53 | if (! INTERNAL_SYSCALL_ERROR_P (result, err) |
54 | || INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS) | |
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55 | return result; |
56 | ||
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57 | __libc_missing_32bit_uids = 1; |
58 | } | |
59 | # endif /* __NR_setfsuid32 */ | |
60 | ||
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61 | if (uid != (uid_t) ((__kernel_uid_t) uid)) |
62 | { | |
63 | __set_errno (EINVAL); | |
64 | return -1; | |
65 | } | |
66 | ||
359b695d | 67 | /* No error checking. */ |
fd54683c | 68 | return INTERNAL_SYSCALL (setfsuid, err, 1, uid); |
313fed01 | 69 | # endif |
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70 | } |
71 | #endif |