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When _FORTIFY_SOURCE is defined to 2, ____longjmp_chk is called, instead of longjmp. ____longjmp_chk compares the relative stack values to decide if it is called from a stack frame which called setjmp. If not, ____longjmp_chk assumes that an alternate signal stack is used. Since comparing the relative stack values isn't reliable with user context, when there is no signal, ____longjmp_chk will fail. Undefine _FORTIFY_SOURCE to avoid ____longjmp_chk in user context test.
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* Check longjmp from user context to main context.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* When _FORTIFY_SOURCE is defined to 2, ____longjmp_chk is called,
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instead of longjmp. ____longjmp_chk compares the relative stack
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values to decide if it is called from a stack frame which called
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setjmp. If not, ____longjmp_chk assumes that an alternate signal
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stack is used. Since comparing the relative stack values isn't
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reliable with user context, when there is no signal, ____longjmp_chk
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will fail. Undefine _FORTIFY_SOURCE to avoid ____longjmp_chk. */
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#undef _FORTIFY_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <setjmp.h>
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#include <ucontext.h>
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#include <unistd.h>
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static jmp_buf jmpbuf;
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static ucontext_t ctx;
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static void f2 (void);
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static void
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__attribute__ ((noinline, noclone))
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f1 (void)
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{
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printf ("start f1\n");
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f2 ();
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}
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static void
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__attribute__ ((noinline, noclone))
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f2 (void)
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{
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printf ("start f2\n");
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if (setcontext (&ctx) != 0)
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{
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printf ("%s: setcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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}
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static void
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f3 (void)
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{
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printf ("start f3\n");
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longjmp (jmpbuf, 1);
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}
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static int
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__attribute__ ((noinline, noclone))
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do_test_1 (void)
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{
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char st1[32768];
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if (setjmp (jmpbuf) != 0)
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return 0;
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puts ("making contexts");
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if (getcontext (&ctx) != 0)
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{
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printf ("%s: getcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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ctx.uc_stack.ss_sp = st1;
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ctx.uc_stack.ss_size = sizeof st1;
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ctx.uc_link = NULL;
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makecontext (&ctx, (void (*) (void)) f3, 0);
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f1 ();
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puts ("FAIL: returned from f1 ()");
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exit (EXIT_FAILURE);
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}
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static int
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do_test (void)
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{
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return do_test_1 ();
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}
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#include <support/test-driver.c>
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