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Mention the oddities and requirements for mount operations executed by

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non-root users.

PR:		docs/42651
Submitted by:	Thomas Seck <tmseck@netcologne.de>
MFC after:	3 days
This commit is contained in:
Joerg Wunsch 2003-01-13 19:42:21 +00:00
parent 81075acb51
commit b4206324a5
2 changed files with 20 additions and 3 deletions
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19
lib/libc/sys/mount.2
View File

@ -74,6 +74,13 @@ at the time
of a successful mount are swept under the carpet so to speak, and
are unavailable until the file system is unmounted.
.Pp
By default only the super-user may call the
.Fn mount
function.
This restriction can be removed by setting the sysctl
.Em vfs.usermount
to a non-zero value.
.Pp
The following
.Fa flags
may be specified to
@ -81,17 +88,19 @@ suppress default semantics which affect file system access.
.Bl -tag -width MNT_SYNCHRONOUS
.It Dv MNT_RDONLY
The file system should be treated as read-only;
Even the super-user may not write on it.
even the super-user may not write on it.
Specifying MNT_UPDATE without this option will upgrade
a read-only file system to read/write.
.It Dv MNT_NOEXEC
Do not allow files to be executed from the file system.
.It Dv MNT_NOSUID
Do not honor setuid or setgid bits on files when executing them.
This flag is set automatically when the caller is not the super-user.
.It Dv MNT_NOATIME
Disable update of file access times.
.It Dv MNT_NODEV
Do not interpret special files on the file system.
This flag is set automatically when the caller is not the super-user.
.It Dv MNT_SUIDDIR
Directories with the SUID bit set chown new files to their own owner.
.It Dv MNT_SYNCHRONOUS
@ -178,7 +187,8 @@ The
system call will fail when one of the following occurs:
.Bl -tag -width Er
.It Bq Er EPERM
The caller is not the super-user.
The caller is neither the super-user nor the owner of
.Ar dir .
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded 255 characters,
or the entire length of a path name exceeded 1023 characters.
@ -261,7 +271,9 @@ The
system call may fail with one of the following errors:
.Bl -tag -width Er
.It Bq Er EPERM
The caller is not the super-user.
The caller is neither the super-user nor the user who issued the corresponding
.Xr mount 2
call.
.It Bq Er ENOTDIR
A component of the path is not a directory.
.It Bq Er ENAMETOOLONG
@ -290,6 +302,7 @@ mounted.
.Sh SEE ALSO
.Xr lsvfs 1 ,
.Xr mount 8 ,
.Xr sysctl 8 ,
.Xr umount 8
.Sh BUGS
Some of the error codes need translation to more obvious messages.

4
sbin/mount/mount.8
View File

@ -159,6 +159,8 @@ Disable write clustering.
Do not interpret character or block special devices on the file system.
This option is useful for a server that has file systems containing
special devices for architectures other than its own.
This option is set automatically when the user does not have super-user
privileges.
.It Cm noexec
Do not allow execution of any binaries on the mounted file system.
This option is useful for a server that has file systems containing
@ -169,6 +171,7 @@ Note: this option is worthless if a public available suid or sgid
wrapper like
.Xr suidperl 1
is installed on your system.
It is set automatically when the user does not have super-user privileges.
.It Cm nosymfollow
Do not follow symlinks
on the mounted file system.
@ -430,6 +433,7 @@ file system table
.Xr mount_udf 8 ,
.Xr mount_umapfs 8 ,
.Xr mount_unionfs 8 ,
.Xr sysctl 8 ,
.Xr umount 8
.Sh BUGS
It is possible for a corrupted file system to cause a crash.