^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Permission to use, copy, modify, and distribute this software for any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * purpose with or without fee is hereby granted, provided that the above
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * copyright notice and this permission notice appear in all copies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /* Test readlink /proc/self/map_files/... with minimum address. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void pass(const char *fmt, unsigned long a, unsigned long b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) char name[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) char buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) snprintf(name, sizeof(name), fmt, a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (readlink(name, buf, sizeof(buf)) == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void fail(const char *fmt, unsigned long a, unsigned long b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) char name[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) char buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) snprintf(name, sizeof(name), fmt, a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * va_max must be enough bigger than vm.mmap_min_addr, which is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * 64KB/32KB by default. (depends on CONFIG_LSM_MMAP_MIN_ADDR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) const unsigned long va_max = 1UL << 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) unsigned long va;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) void *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) unsigned long a, b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) fd = open("/dev/zero", O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (fd == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) for (va = 0; va < va_max; va += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) p = mmap((void *)va, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (p == (void *)va)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (va == va_max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) fprintf(stderr, "error: mmap doesn't like you\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) a = (unsigned long)p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) b = (unsigned long)p + PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) pass("/proc/self/map_files/%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) fail("/proc/self/map_files/ %lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) fail("/proc/self/map_files/%lx -%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) fail("/proc/self/map_files/%lx- %lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) fail("/proc/self/map_files/%lx-%lx ", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) fail("/proc/self/map_files/0%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) fail("/proc/self/map_files/%lx-0%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (sizeof(long) == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) fail("/proc/self/map_files/100000000%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) fail("/proc/self/map_files/%lx-100000000%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) } else if (sizeof(long) == 8) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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