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/*
* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* Test readlink /proc/self/map_files/... with minimum address. */
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdlib.h>
static void pass(const char *fmt, unsigned long a, unsigned long b)
{
char name[64];
char buf[64];
snprintf(name, sizeof(name), fmt, a, b);
if (readlink(name, buf, sizeof(buf)) == -1)
exit(1);
}
static void fail(const char *fmt, unsigned long a, unsigned long b)
{
char name[64];
char buf[64];
snprintf(name, sizeof(name), fmt, a, b);
if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
return;
exit(1);
}
int main(void)
{
const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
/*
* va_max must be enough bigger than vm.mmap_min_addr, which is
* 64KB/32KB by default. (depends on CONFIG_LSM_MMAP_MIN_ADDR)
*/
const unsigned long va_max = 1UL << 20;
unsigned long va;
void *p;
int fd;
unsigned long a, b;
fd = open("/dev/zero", O_RDONLY);
if (fd == -1)
return 1;
for (va = 0; va < va_max; va += PAGE_SIZE) {
p = mmap((void *)va, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
if (p == (void *)va)
break;
}
if (va == va_max) {
fprintf(stderr, "error: mmap doesn't like you\n");
return 1;
}
a = (unsigned long)p;
b = (unsigned long)p + PAGE_SIZE;
pass("/proc/self/map_files/%lx-%lx", a, b);
fail("/proc/self/map_files/ %lx-%lx", a, b);
fail("/proc/self/map_files/%lx -%lx", a, b);
fail("/proc/self/map_files/%lx- %lx", a, b);
fail("/proc/self/map_files/%lx-%lx ", a, b);
fail("/proc/self/map_files/0%lx-%lx", a, b);
fail("/proc/self/map_files/%lx-0%lx", a, b);
if (sizeof(long) == 4) {
fail("/proc/self/map_files/100000000%lx-%lx", a, b);
fail("/proc/self/map_files/%lx-100000000%lx", a, b);
} else if (sizeof(long) == 8) {
fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
} else
return 1;
return 0;
}
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