1 /* Copyright (C) 2009-2021 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