findmnt: add option to list all fs-independent flags
It might be useful for security auditing purposes list all possible mount flags/options including default set which are normally not listed. This patch adds "--vfs-all" option to list all fs-independent flags on VFS-OPTIONS column, as well as libmount funcionality to accomplish it. i.e.: $ findmnt -o VFS-OPTIONS VFS-OPTIONS rw,relatime rw,nosuid,nodev,noexec,relatime rw,nosuid,nodev,noexec,relatime ro,nosuid,nodev,noexec ... $ findmnt --vfs-all -o VFS-OPTIONS VFS-OPTIONS rw,exec,suid,dev,async,loud,nomand,atime,noiversion,diratime,relatime,nostrictatime,nolazytime,symfollow rw,noexec,nosuid,nodev,async,loud,nomand,atime,noiversion,diratime,relatime,nostrictatime,nolazytime,symfollow rw,noexec,nosuid,nodev,async,loud,nomand,atime,noiversion,diratime,relatime,nostrictatime,nolazytime,symfollow ro,noexec,nosuid,nodev,async,loud,nomand,atime,noiversion,diratime,norelatime,nostrictatime,nolazytime,symfollow ... [kzak@redhat.com: - cleanup coding style and comments] Signed-off-by: Roberto Bergantinos Corpas <rbergant@redhat.com> Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -245,6 +245,7 @@ mnt_fs_get_usedsize
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mnt_fs_get_userdata
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mnt_fs_get_user_options
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mnt_fs_get_vfs_options
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mnt_fs_get_vfs_options_all
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mnt_fs_is_kernel
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mnt_fs_is_netfs
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mnt_fs_is_pseudofs
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@ -951,6 +951,38 @@ const char *mnt_fs_get_vfs_options(struct libmnt_fs *fs)
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return fs ? fs->vfs_optstr : NULL;
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}
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/**
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* mnt_fs_get_vfs_options_all:
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* @fs: fstab/mtab entry pointer
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*
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* Returns: pointer to newlly allocated string (can be freed by free(3)) or
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* NULL in case of error. The string contains all (including defaults) mount
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* options.
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*/
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char *mnt_fs_get_vfs_options_all(struct libmnt_fs *fs)
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{
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const struct libmnt_optmap *map = mnt_get_builtin_optmap(MNT_LINUX_MAP);
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const struct libmnt_optmap *ent;
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const char *opts = mnt_fs_get_options(fs);
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char *result = NULL;
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unsigned long flags = 0;
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if (!opts || mnt_optstr_get_flags(opts, &flags, map))
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return NULL;
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for (ent = map ; ent && ent->name ; ent++){
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if (ent->id & flags) { /* non-default value */
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if (!(ent->mask & MNT_INVERT))
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mnt_optstr_append_option(&result, ent->name, NULL);
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else
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continue;
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} else if (ent->mask & MNT_INVERT)
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mnt_optstr_append_option(&result, ent->name, NULL);
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}
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return result;
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}
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/**
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* mnt_fs_get_user_options:
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* @fs: fstab/mtab entry pointer
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@ -471,6 +471,7 @@ extern int mnt_fs_get_option(struct libmnt_fs *fs, const char *name,
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extern const char *mnt_fs_get_fs_options(struct libmnt_fs *fs);
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extern const char *mnt_fs_get_vfs_options(struct libmnt_fs *fs);
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extern const char *mnt_fs_get_user_options(struct libmnt_fs *fs);
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extern char *mnt_fs_get_vfs_options_all(struct libmnt_fs *fs);
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extern const char *mnt_fs_get_attributes(struct libmnt_fs *fs);
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extern int mnt_fs_set_attributes(struct libmnt_fs *fs, const char *optstr);
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@ -356,3 +356,7 @@ MOUNT_2_35 {
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mnt_context_get_target_prefix;
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mnt_context_set_target_prefix;
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} MOUNT_2.34;
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MOUNT_2_37 {
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mnt_fs_get_vfs_options_all;
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} MOUNT_2_35;
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@ -262,6 +262,12 @@ It's possible to specify source (device) or target (mountpoint) to filter mount
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.TP
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.B \-\-verbose
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Force findmnt to print more information (\fB\-\-verify\fP only for now).
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.TP
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.B \-\-vfs-all
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When used with
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.BR VFS-OPTIONS
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column, print all VFS (fs-independent) flags. This option is designed for auditing purposes to
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list also default VFS kernel mount options which are normally not listed.
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.SH ENVIRONMENT
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.IP LIBMOUNT_FSTAB=<path>
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overrides the default location of the fstab file
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@ -545,7 +545,9 @@ static char *get_data(struct libmnt_fs *fs, int num)
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str = xstrdup(mnt_fs_get_options(fs));
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break;
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case COL_VFS_OPTIONS:
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if (mnt_fs_get_vfs_options(fs))
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if (flags & FL_VFS_ALL)
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str = mnt_fs_get_vfs_options_all(fs);
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else if (mnt_fs_get_vfs_options(fs))
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str = xstrdup(mnt_fs_get_vfs_options(fs));
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break;
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case COL_FS_OPTIONS:
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@ -1262,6 +1264,7 @@ static void __attribute__((__noreturn__)) usage(void)
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fputc('\n', out);
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fputs(_(" -x, --verify verify mount table content (default is fstab)\n"), out);
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fputs(_(" --verbose print more details\n"), out);
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fputs(_(" --vfs-all print all VFS options\n"), out);
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fputs(USAGE_SEPARATOR, out);
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printf(USAGE_HELP_OPTIONS(24));
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@ -1294,7 +1297,8 @@ int main(int argc, char *argv[])
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FINDMNT_OPT_TREE,
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FINDMNT_OPT_OUTPUT_ALL,
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FINDMNT_OPT_PSEUDO,
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FINDMNT_OPT_REAL
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FINDMNT_OPT_REAL,
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FINDMNT_OPT_VFS_ALL
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};
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static const struct option longopts[] = {
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@ -1338,6 +1342,7 @@ int main(int argc, char *argv[])
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{ "tree", no_argument, NULL, FINDMNT_OPT_TREE },
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{ "real", no_argument, NULL, FINDMNT_OPT_REAL },
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{ "pseudo", no_argument, NULL, FINDMNT_OPT_PSEUDO },
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{ "vfs-all", no_argument, NULL, FINDMNT_OPT_VFS_ALL },
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{ NULL, 0, NULL, 0 }
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};
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@ -1512,6 +1517,9 @@ int main(int argc, char *argv[])
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case FINDMNT_OPT_REAL:
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flags |= FL_REAL;
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break;
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case FINDMNT_OPT_VFS_ALL:
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flags |= FL_VFS_ALL;
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break;
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case 'h':
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usage();
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@ -20,6 +20,7 @@ enum {
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FL_VERBOSE = (1 << 16),
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FL_PSEUDO = (1 << 17),
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FL_REAL = (1 << 18),
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FL_VFS_ALL = (1 << 19),
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/* basic table settings */
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FL_ASCII = (1 << 20),
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