glibc/elf/tst-ifunc-fault-lazy.c

/* Program with local IFUNC resolver which crashes, for testing bug 24214.
   Copyright (C) 2019-2020 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, see
   <https://www.gnu.org/licenses/>.  */

/* The construct below is expected to produce an IRELATIVE relocation
   with an IFUNC resolver that crashes. ldd should not performs such
   relocations.  */

#include <config.h>

#ifdef HAVE_GCC_IFUNC

# include <stddef.h>

static void
implementation (void)
{
  /* Produce a crash, without depending on any relocations.  */
  volatile char *volatile p = NULL;
  *p = 0;
}

static __typeof__ (implementation) *
resolver (void)
{
  /* Produce a crash, without depending on any relocations.  */
  volatile char *volatile p = NULL;
  *p = 0;
  return implementation;
}

static void magic (void) __attribute__ ((ifunc ("resolver")));

void (*magic_ptr) (void) = magic;

#endif /* HAVE_GCC_IFUNC */

/* The program is expected not to run.  */
int
main (void)
{
  return 1;
}