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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,114 @@ | ||
| /* Test case mostly written by Paolo Bonzini <pbonzini@redhat.com>. */ | ||
| #include <assert.h> | ||
| #include <setjmp.h> | ||
| #include <signal.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <sys/types.h> | ||
| #include <sys/time.h> | ||
| #include <sys/resource.h> | ||
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| static jmp_buf mainloop; | ||
| static sigset_t mainsigset; | ||
| static int pass; | ||
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| static void | ||
| stackoverflow_handler (int sig) | ||
| { | ||
| stack_t altstack; | ||
| pass++; | ||
| sigaltstack (NULL, &altstack); | ||
| /* Using printf is not really kosher in signal handlers but we know | ||
| it will work. */ | ||
| printf ("%*sin signal handler\n", pass, ""); | ||
| if (altstack.ss_flags & SS_ONSTACK) | ||
| printf ("%*son alternate stack\n", pass, ""); | ||
| siglongjmp (mainloop, pass); | ||
| } | ||
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| static volatile int * | ||
| recurse_1 (int n, volatile int *p) | ||
| { | ||
| if (n >= 0) | ||
| *recurse_1 (n + 1, p) += n; | ||
| return p; | ||
| } | ||
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| static int | ||
| recurse (int n) | ||
| { | ||
| int sum = 0; | ||
| return *recurse_1 (n, &sum); | ||
| } | ||
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| static int | ||
| do_test (void) | ||
| { | ||
| char mystack[SIGSTKSZ]; | ||
| stack_t altstack; | ||
| struct sigaction action; | ||
| sigset_t emptyset; | ||
| /* Before starting the endless recursion, try to be friendly to the user's | ||
| machine. On some Linux 2.2.x systems, there is no stack limit for user | ||
| processes at all. We don't want to kill such systems. */ | ||
| struct rlimit rl; | ||
| rl.rlim_cur = rl.rlim_max = 0x100000; /* 1 MB */ | ||
| setrlimit (RLIMIT_STACK, &rl); | ||
| /* Install the alternate stack. */ | ||
| altstack.ss_sp = mystack; | ||
| altstack.ss_size = sizeof (mystack); | ||
| altstack.ss_flags = 0; /* no SS_DISABLE */ | ||
| if (sigaltstack (&altstack, NULL) < 0) | ||
| { | ||
| puts ("first sigaltstack failed"); | ||
| return 0; | ||
| } | ||
| /* Install the SIGSEGV handler. */ | ||
| sigemptyset (&action.sa_mask); | ||
| action.sa_handler = &stackoverflow_handler; | ||
| action.sa_flags = SA_ONSTACK; | ||
| sigaction (SIGSEGV, &action, (struct sigaction *) NULL); | ||
| sigaction (SIGBUS, &action, (struct sigaction *) NULL); | ||
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| /* Save the current signal mask. */ | ||
| sigemptyset (&emptyset); | ||
| sigprocmask (SIG_BLOCK, &emptyset, &mainsigset); | ||
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| /* Provoke two stack overflows in a row. */ | ||
| if (sigsetjmp (mainloop, 1) != 0) | ||
| { | ||
| assert (pass != 0); | ||
| printf ("%*sout of signal handler\n", pass, ""); | ||
| } | ||
| else | ||
| assert (pass == 0); | ||
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| sigaltstack (NULL, &altstack); | ||
| if (altstack.ss_flags & SS_ONSTACK) | ||
| printf ("%*son alternate stack\n", pass, ""); | ||
| else | ||
| printf ("%*snot on alternate stack\n", pass, ""); | ||
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| if (pass < 2) | ||
| { | ||
| recurse (0); | ||
| puts ("recurse call returned"); | ||
| return 2; | ||
| } | ||
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| altstack.ss_flags |= SS_DISABLE; | ||
| if (sigaltstack (&altstack, NULL) == -1) | ||
| printf ("disabling alternate stack failed\n"); | ||
| else | ||
| printf ("disabling alternate stack succeeded \n"); | ||
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| return 0; | ||
| } | ||
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| #define TEST_FUNCTION do_test () | ||
| #include "../test-skeleton.c" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,45 +1 @@ | ||
| /* Copyright (C) 2001,2004,2005,2006,2009 Free Software Foundation, Inc. | ||
| This file is part of the GNU C Library. | ||
| The GNU C Library is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU Lesser General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2.1 of the License, or (at your option) any later version. | ||
| The GNU C Library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Lesser General Public License for more details. | ||
| You should have received a copy of the GNU Lesser General Public | ||
| License along with the GNU C Library; if not, write to the Free | ||
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | ||
| 02111-1307 USA. */ | ||
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| .section .rodata.str1.1,"aMS",@progbits,1 | ||
| .type longjmp_msg,@object | ||
| longjmp_msg: | ||
| .string "longjmp causes uninitialized stack frame" | ||
| .size longjmp_msg, .-longjmp_msg | ||
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| #define __longjmp ____longjmp_chk | ||
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| #ifdef PIC | ||
| # define CALL_FAIL movl %ebx, %ecx; \ | ||
| cfi_register(%ebx,%ecx); \ | ||
| LOAD_PIC_REG (bx); \ | ||
| leal longjmp_msg@GOTOFF(%ebx), %eax; \ | ||
| call __GI___fortify_fail@PLT | ||
| #else | ||
| # define CALL_FAIL movl $longjmp_msg, %eax; \ | ||
| call __fortify_fail | ||
| #endif | ||
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| #define CHECK_ESP(reg) \ | ||
| cmpl reg, %esp; \ | ||
| jbe .Lok; \ | ||
| CALL_FAIL; \ | ||
| .Lok: | ||
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| #include "__longjmp.S" | ||
| #error "OS-specific version needed" |
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