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