1 | /* Copyright (C) 2009-2024 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 <errno.h> |
19 | #include <sysdep.h> |
20 | #include <setjmp.h> |
21 | #include <bits/setjmp.h> |
22 | #include <stdlib.h> |
23 | #include <unistd.h> |
24 | #include <stdio.h> |
25 | #include <stdint.h> |
26 | #include <signal.h> |
27 | #include <sys/syscall.h> |
28 | |
29 | #define __longjmp ____longjmp_chk |
30 | |
31 | #define CHECK_SP(env, guard) \ |
32 | do \ |
33 | { \ |
34 | uintptr_t cur_sp; \ |
35 | uintptr_t new_sp = env->__gregs[9]; \ |
36 | __asm__ ("lgr %0, %%r15" : "=r" (cur_sp)); \ |
37 | new_sp ^= guard; \ |
38 | if (new_sp < cur_sp) \ |
39 | { \ |
40 | stack_t oss; \ |
41 | int res = INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &oss); \ |
42 | if (!INTERNAL_SYSCALL_ERROR_P (res)) \ |
43 | { \ |
44 | if ((oss.ss_flags & SS_ONSTACK) == 0 \ |
45 | || ((uintptr_t) (oss.ss_sp + oss.ss_size) - new_sp \ |
46 | < oss.ss_size)) \ |
47 | __fortify_fail ("longjmp causes uninitialized stack frame");\ |
48 | } \ |
49 | } \ |
50 | } while (0) |
51 | |
52 | #include "__longjmp.c" |
53 | |