1 | /* Copyright (C) 2015-2022 Free Software Foundation, Inc. |
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 |
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. |
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 |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <sys/personality.h> |
19 | #include <sysdep.h> |
20 | |
21 | extern __typeof (personality) __personality; |
22 | |
23 | int |
24 | __personality (unsigned long persona) |
25 | { |
26 | #ifdef PERSONALITY_TRUNCATE_ARGUMENT |
27 | /* Starting with kernel commit v2.6.21-3117-g97dc32c, the type of |
28 | task_struct->pesonality is "unsigned int". |
29 | Starting with kernel commit v2.6.35-rc1-372-g485d527, the personality |
30 | syscall accepts "unsigned int" instead of "long unsigned int". |
31 | Inbetween, a personality argument that does not fit into "unsigned int" |
32 | would result to system call returning -EINVAL. |
33 | We explicitly truncate the personality argument to "unsigned int" |
34 | to eliminate the uncertainty. */ |
35 | persona = (unsigned int) persona; |
36 | #endif |
37 | |
38 | long int ret = INTERNAL_SYSCALL_CALL (personality, persona); |
39 | |
40 | /* Starting with kernel commit v2.6.29-6609-g11d06b2, the personality syscall |
41 | never fails. However, 32-bit kernels might flag valid values as errors, so |
42 | we need to reverse the error setting. We can't use the raw result as some |
43 | arches split the return/error values. */ |
44 | if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (ret))) |
45 | ret = -INTERNAL_SYSCALL_ERRNO (ret); |
46 | return ret; |
47 | } |
48 | weak_alias (__personality, personality) |
49 | |