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ecdeaac0 | 1 | /* Stack executability handling for GNU dynamic linker. Linux version. |
04277e02 | 2 | Copyright (C) 2003-2019 Free Software Foundation, Inc. |
ecdeaac0 RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
ecdeaac0 RM |
18 | |
19 | #include <ldsodefs.h> | |
20 | #include <sys/mman.h> | |
21 | #include <errno.h> | |
eec8b6ca | 22 | #include <libintl.h> |
ecdeaac0 RM |
23 | #include <stdbool.h> |
24 | #include <stackinfo.h> | |
606832e6 | 25 | #include <sysdep.h> |
ecdeaac0 | 26 | |
5cb48b84 | 27 | |
664e7d93 | 28 | extern int __stack_prot attribute_relro attribute_hidden; |
dcca3fe2 UD |
29 | |
30 | ||
ecdeaac0 | 31 | int |
0a182a28 | 32 | _dl_make_stack_executable (void **stack_endp) |
ecdeaac0 | 33 | { |
760bafc5 | 34 | /* This gives us the highest/lowest page that needs to be changed. */ |
eec8b6ca | 35 | uintptr_t page = ((uintptr_t) *stack_endp |
afdca0f2 | 36 | & -(intptr_t) GLRO(dl_pagesize)); |
606832e6 | 37 | int result = 0; |
760bafc5 | 38 | |
93df14ee JM |
39 | if (__builtin_expect (__mprotect ((void *) page, GLRO(dl_pagesize), |
40 | __stack_prot) == 0, 1)) | |
41 | goto return_success; | |
42 | result = errno; | |
43 | goto out; | |
ecdeaac0 | 44 | |
5cb48b84 | 45 | return_success: |
eec8b6ca UD |
46 | /* Clear the address. */ |
47 | *stack_endp = NULL; | |
48 | ||
69c9fa04 UD |
49 | /* Remember that we changed the permission. */ |
50 | GL(dl_stack_flags) |= PF_X; | |
51 | ||
606832e6 UD |
52 | out: |
53 | #ifdef check_consistency | |
54 | check_consistency (); | |
55 | #endif | |
56 | ||
57 | return result; | |
ecdeaac0 RM |
58 | } |
59 | rtld_hidden_def (_dl_make_stack_executable) |