| 1 | /* Copyright (C) 2009-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 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 |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <errno.h> |
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| 19 | #include <sysdep.h> |
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| 20 | #include <setjmp.h> |
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| 21 | #include <bits/setjmp.h> |
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| 22 | #include <stdlib.h> |
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| 23 | #include <unistd.h> |
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| 24 | #include <stdio.h> |
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| 25 | #include <stdint.h> |
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| 26 | #include <signal.h> |
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| 27 | #include <sys/syscall.h> |
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| 28 | |
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| 29 | #define __longjmp ____longjmp_chk |
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| 30 | |
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| 31 | #define CHECK_SP(env, guard) \ |
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| 32 | do \ |
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| 33 | { \ |
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| 34 | uintptr_t cur_sp; \ |
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| 35 | uintptr_t new_sp = env->__gregs[9]; \ |
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| 36 | __asm__ ("lgr %0, %%r15" : "=r" (cur_sp)); \ |
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| 37 | new_sp ^= guard; \ |
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| 38 | if (new_sp < cur_sp) \ |
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| 39 | { \ |
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| 40 | stack_t oss; \ |
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| 41 | int res = INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &oss); \ |
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| 42 | if (!INTERNAL_SYSCALL_ERROR_P (res)) \ |
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| 43 | { \ |
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| 44 | if ((oss.ss_flags & SS_ONSTACK) == 0 \ |
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| 45 | || ((uintptr_t) (oss.ss_sp + oss.ss_size) - new_sp \ |
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| 46 | < oss.ss_size)) \ |
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| 47 | __fortify_fail ("longjmp causes uninitialized stack frame");\ |
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| 48 | } \ |
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| 49 | } \ |
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| 50 | } while (0) |
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| 51 | |
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| 52 | #include "__longjmp.c" |
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| 53 | |
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