granicus.if.org Git - strace/blob - tests/fsmount.c

   1 /*
   2  * Check decoding of fsmount syscall.
   3  *
   4  * Copyright (c) 2019 Dmitry V. Levin <ldv@altlinux.org>
   5  * All rights reserved.
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 #include "tests.h"
  11 #include "scno.h"
  12
  13 #ifdef __NR_fsmount
  14
  15 # include <fcntl.h>
  16 # include <stdio.h>
  17 # include <stdint.h>
  18 # include <unistd.h>
  19
  20 static const char *errstr;
  21
  22 static long
  23 k_fsmount(const unsigned int fs_fd,
  24           const unsigned int flags,
  25           const unsigned int attr_flags)
  26 {
  27         const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
  28         const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
  29         const kernel_ulong_t arg1 = fill | fs_fd;
  30         const kernel_ulong_t arg2 = fill | flags;
  31         const kernel_ulong_t arg3 = fill | attr_flags;
  32         const long rc = syscall(__NR_fsmount,
  33                                 arg1, arg2, arg3, bad, bad, bad);
  34         errstr = sprintrc(rc);
  35         return rc;
  36 }
  37
  38 int
  39 main(void)
  40 {
  41         skip_if_unavailable("/proc/self/fd/");
  42
  43         static const char path[] = "/dev/full";
  44         int fd = open(path, O_WRONLY);
  45         if (fd < 0)
  46                 perror_msg_and_fail("open: %s", path);
  47
  48         struct {
  49                 unsigned int val;
  50                 const char *str;
  51         } flags[] = {
  52                 { ARG_STR(0) },
  53                 { 1, "FSMOUNT_CLOEXEC" },
  54                 { 2, "0x2 /* FSMOUNT_??? */" },
  55                 { 0xfffffffe, "0xfffffffe /* FSMOUNT_??? */" },
  56                 { -1, "FSMOUNT_CLOEXEC|0xfffffffe" }
  57         },
  58         attrs[] = {
  59                 { ARG_STR(0) },
  60                 { 1, "MOUNT_ATTR_RDONLY" },
  61                 { 0x10, "MOUNT_ATTR_NOATIME" },
  62                 { 0xbf, "MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_NODEV"
  63                         "|MOUNT_ATTR_NOEXEC|MOUNT_ATTR_NOATIME"
  64                         "|MOUNT_ATTR_STRICTATIME|MOUNT_ATTR_NODIRATIME" },
  65                 { 0x40, "0x40 /* MOUNT_ATTR_??? */" },
  66                 { 0xffffff40, "0xffffff40 /* MOUNT_ATTR_??? */" },
  67                 { -1, "MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_NODEV"
  68                         "|MOUNT_ATTR_NOEXEC|MOUNT_ATTR_NOATIME"
  69                         "|MOUNT_ATTR_STRICTATIME|MOUNT_ATTR_NODIRATIME"
  70                         "|0xffffff40" }
  71         };
  72
  73         for (unsigned int i = 0; i < ARRAY_SIZE(flags); ++i) {
  74                 for (unsigned int j = 0; j < ARRAY_SIZE(attrs); ++j) {
  75                         k_fsmount(-1, flags[i].val, attrs[j].val);
  76                         printf("fsmount(-1, %s, %s) = %s\n",
  77                                flags[i].str, attrs[j].str, errstr);
  78
  79                         k_fsmount(-100, flags[i].val, attrs[j].val);
  80                         printf("fsmount(-100, %s, %s) = %s\n",
  81                                flags[i].str, attrs[j].str, errstr);
  82
  83                         k_fsmount(fd, flags[i].val, attrs[j].val);
  84                         printf("fsmount(%d<%s>, %s, %s) = %s\n",
  85                                fd, path, flags[i].str, attrs[j].str, errstr);
  86                 }
  87         }
  88
  89         puts("+++ exited with 0 +++");
  90         return 0;
  91 }
  92
  93 #else
  94
  95 SKIP_MAIN_UNDEFINED("__NR_fsmount")
  96
  97 #endif