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112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/* Test of getting protection of a virtual memory area.
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Copyright (C) 2024-2026 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published
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by the Free Software Foundation, either version 3 of the License,
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or (at your option) any later version.
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This file 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2024. */
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#include <config.h>
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#include "vma-prot.h"
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#include <stdlib.h>
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#if HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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# include <unistd.h>
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#endif
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#include "macros.h"
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int dummy;
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int
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f (int x)
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{
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return x;
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}
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int
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main (void)
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{
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int prot;
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/* Test on memory allocated through malloc(). */
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{
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char *mem = malloc (10);
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prot = get_vma_prot (mem + 2, 5);
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ASSERT (prot != -1);
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ASSERT (((VMA_PROT_READ | VMA_PROT_WRITE) & ~prot) == 0);
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}
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{
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char *mem = malloc (1000000);
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prot = get_vma_prot (mem, 1000000);
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ASSERT (prot != -1);
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ASSERT (((VMA_PROT_READ | VMA_PROT_WRITE) & ~prot) == 0);
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}
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#if HAVE_SYS_MMAN_H
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/* Test on memory allocated through mmap(). */
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{
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char *mem = mmap (NULL, 1024*1024, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (mem != (char *)(-1))
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{
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prot = get_vma_prot (mem, 1024*1024);
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ASSERT (prot != -1);
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ASSERT (prot == (VMA_PROT_READ | VMA_PROT_WRITE));
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size_t pagesize = sysconf (_SC_PAGESIZE);
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if (pagesize <= 512*1024
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&& munmap (mem + pagesize, pagesize) >= 0)
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{
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prot = get_vma_prot (mem, 1024*1024);
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ASSERT (prot != -1);
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# if !defined __FILC__ /* <https://github.com/pizlonator/fil-c/issues/285> */
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ASSERT (prot == 0);
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# endif
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}
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}
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}
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#endif
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/* Test on a global variable. */
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prot = get_vma_prot (&dummy, sizeof (dummy));
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ASSERT (prot != -1);
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ASSERT (((VMA_PROT_READ | VMA_PROT_WRITE) & ~prot) == 0);
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/* Test on a function. */
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prot = get_vma_prot (&f, 1);
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ASSERT (prot != -1);
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#if (defined __hppa || defined __hppa64__ \
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|| defined __ia64__ \
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|| defined _AIX \
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|| (defined __powerpc64__ && defined __linux__ && _CALL_ELF != 2))
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/* On these platforms, a function pointer is actually a pointer to
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a struct of pointers. */
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#else
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/* On these platforms, a function pointer is a pointer to or into some
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machine instruction. */
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# if !defined __FILC__
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ASSERT ((VMA_PROT_EXECUTE & ~prot) == 0);
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# endif
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#endif
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#if !defined __OpenBSD__
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/* Except on OpenBSD/arm64, the machine instructions are also readable. */
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ASSERT ((VMA_PROT_READ & ~prot) == 0);
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#endif
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return test_exit_status;
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}
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