sysdeps/unix/sysv/linux/tst-misalign-clone.c

   1 /* Verify that the clone wrapper properly aligns the child stack.
   2    Copyright (C) 2021-2024 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 #include <sched.h>
  20 #include <stdbool.h>
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <sys/wait.h>
  25 #include <unistd.h>
  26 #include <libc-pointer-arith.h>
  27 #include <tst-stack-align.h>
  28 #include <stackinfo.h>
  29 #include <support/xunistd.h>
  30 #include <support/check.h>
  31
  32 static int
  33 check_stack_alignment (void *arg)
  34 {
  35   bool ok = true;
  36
  37   puts ("in f");
  38
  39   if (TEST_STACK_ALIGN ())
  40     ok = false;
  41
  42   return ok ? 0 : 1;
  43 }
  44
  45 static int
  46 do_test (void)
  47 {
  48   puts ("in do_test");
  49
  50   if (TEST_STACK_ALIGN ())
  51     FAIL_EXIT1 ("stack isn't aligned\n");
  52
  53 # define STACK_SIZE (128 * 1024)
  54
  55   char st[STACK_SIZE + 1];
  56   /* NB: Align child stack to 1 byte.  */
  57   char *stack = PTR_ALIGN_UP (&st[0], 2) + 1;
  58
  59 #if _STACK_GROWS_DOWN
  60   pid_t p = clone (check_stack_alignment, stack + STACK_SIZE, 0, 0);
  61 #elif _STACK_GROWS_UP
  62   pid_t p = clone (check_stack_alignment, stack, 0, 0);
  63 #else
  64 # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
  65 #endif
  66
  67   /* Clone must not fail.  */
  68   TEST_VERIFY_EXIT (p != -1);
  69
  70   int e;
  71   xwaitpid (p, &e, __WCLONE);
  72   if (!WIFEXITED (e))
  73     {
  74       if (WIFSIGNALED (e))
  75         printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
  76      FAIL_EXIT1 ("process did not terminate correctly");
  77     }
  78
  79   if (WEXITSTATUS (e) != 0)
  80     FAIL_EXIT1 ("exit code %d", WEXITSTATUS (e));
  81
  82   return 0;
  83 }
  84
  85 #include <support/test-driver.c>