elf/tst-ifunc-fault-lazy.c

   1 /* Program with local IFUNC resolver which crashes, for testing bug 24214.
   2    Copyright (C) 2019-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* The construct below is expected to produce an IRELATIVE relocation
  20    with an IFUNC resolver that crashes. ldd should not performs such
  21    relocations.  */
  22
  23 #include <config.h>
  24
  25 #ifdef HAVE_GCC_IFUNC
  26
  27 # include <stddef.h>
  28
  29 static void
  30 implementation (void)
  31 {
  32   /* Produce a crash, without depending on any relocations.  */
  33   volatile char *volatile p = NULL;
  34   *p = 0;
  35 }
  36
  37 static __typeof__ (implementation) *
  38 resolver (void)
  39 {
  40   /* Produce a crash, without depending on any relocations.  */
  41   volatile char *volatile p = NULL;
  42   *p = 0;
  43   return implementation;
  44 }
  45
  46 static void magic (void) __attribute__ ((ifunc ("resolver")));
  47
  48 void (*magic_ptr) (void) = magic;
  49
  50 #endif /* HAVE_GCC_IFUNC */
  51
  52 /* The program is expected not to run.  */
  53 int
  54 main (void)
  55 {
  56   return 1;
  57 }