diff options
| -rw-r--r-- | util-linux/Config.src | 88 | ||||
| -rw-r--r-- | util-linux/mount.c | 114 |
2 files changed, 108 insertions, 94 deletions
diff --git a/util-linux/Config.src b/util-linux/Config.src index c1cd6daa4..854b3682e 100644 --- a/util-linux/Config.src +++ b/util-linux/Config.src @@ -434,94 +434,6 @@ config MORE you will probably find this utility very helpful. If you don't have any need to reading text files, you can leave this disabled. -config MOUNT - bool "mount" - default y - select PLATFORM_LINUX - help - All files and filesystems in Unix are arranged into one big directory - tree. The 'mount' utility is used to graft a filesystem onto a - particular part of the tree. A filesystem can either live on a block - device, or it can be accessible over the network, as is the case with - NFS filesystems. Most people using BusyBox will also want to enable - the 'mount' utility. - -config FEATURE_MOUNT_FAKE - bool "Support option -f" - default y - depends on MOUNT - help - Enable support for faking a file system mount. - -config FEATURE_MOUNT_VERBOSE - bool "Support option -v" - default y - depends on MOUNT - help - Enable multi-level -v[vv...] verbose messages. Useful if you - debug mount problems and want to see what is exactly passed - to the kernel. - -config FEATURE_MOUNT_HELPERS - bool "Support mount helpers" - default n - depends on MOUNT - help - Enable mounting of virtual file systems via external helpers. - E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call - "obexfs -b00.11.22.33.44.55 /mnt" - Also "mount -t sometype [-o opts] fs /mnt" will try - "sometype [-o opts] fs /mnt" if simple mount syscall fails. - The idea is to use such virtual filesystems in /etc/fstab. - -config FEATURE_MOUNT_LABEL - bool "Support specifying devices by label or UUID" - default y - depends on MOUNT - select VOLUMEID - help - This allows for specifying a device by label or uuid, rather than by - name. This feature utilizes the same functionality as blkid/findfs. - This also enables label or uuid support for swapon. - -config FEATURE_MOUNT_NFS - bool "Support mounting NFS file systems on Linux < 2.6.23" - default n - depends on MOUNT - select FEATURE_HAVE_RPC - select FEATURE_SYSLOG - help - Enable mounting of NFS file systems on Linux kernels prior - to version 2.6.23. Note that in this case mounting of NFS - over IPv6 will not be possible. - - Note that this option links in RPC support from libc, - which is rather large (~10 kbytes on uclibc). - -config FEATURE_MOUNT_CIFS - bool "Support mounting CIFS/SMB file systems" - default y - depends on MOUNT - help - Enable support for samba mounts. - -config FEATURE_MOUNT_FLAGS - depends on MOUNT - bool "Support lots of -o flags in mount" - default y - help - Without this, mount only supports ro/rw/remount. With this, it - supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime, - noatime, diratime, nodiratime, loud, bind, move, shared, slave, - private, unbindable, rshared, rslave, rprivate, and runbindable. - -config FEATURE_MOUNT_FSTAB - depends on MOUNT - bool "Support /etc/fstab and -a" - default y - help - Support mount all and looking for files in /etc/fstab. - config PIVOT_ROOT bool "pivot_root" default y diff --git a/util-linux/mount.c b/util-linux/mount.c index 62fd41fd7..fbc89c862 100644 --- a/util-linux/mount.c +++ b/util-linux/mount.c @@ -17,8 +17,103 @@ // mount_it_now() does the actual mount. // +//config:config MOUNT +//config: bool "mount" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: All files and filesystems in Unix are arranged into one big directory +//config: tree. The 'mount' utility is used to graft a filesystem onto a +//config: particular part of the tree. A filesystem can either live on a block +//config: device, or it can be accessible over the network, as is the case with +//config: NFS filesystems. Most people using BusyBox will also want to enable +//config: the 'mount' utility. +//config: +//config:config FEATURE_MOUNT_FAKE +//config: bool "Support option -f" +//config: default y +//config: depends on MOUNT +//config: help +//config: Enable support for faking a file system mount. +//config: +//config:config FEATURE_MOUNT_VERBOSE +//config: bool "Support option -v" +//config: default y +//config: depends on MOUNT +//config: help +//config: Enable multi-level -v[vv...] verbose messages. Useful if you +//config: debug mount problems and want to see what is exactly passed +//config: to the kernel. +//config: +//config:config FEATURE_MOUNT_HELPERS +//config: bool "Support mount helpers" +//config: default n +//config: depends on MOUNT +//config: help +//config: Enable mounting of virtual file systems via external helpers. +//config: E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call +//config: "obexfs -b00.11.22.33.44.55 /mnt" +//config: Also "mount -t sometype [-o opts] fs /mnt" will try +//config: "sometype [-o opts] fs /mnt" if simple mount syscall fails. +//config: The idea is to use such virtual filesystems in /etc/fstab. +//config: +//config:config FEATURE_MOUNT_LABEL +//config: bool "Support specifying devices by label or UUID" +//config: default y +//config: depends on MOUNT +//config: select VOLUMEID +//config: help +//config: This allows for specifying a device by label or uuid, rather than by +//config: name. This feature utilizes the same functionality as blkid/findfs. +//config: This also enables label or uuid support for swapon. +//config: +//config:config FEATURE_MOUNT_NFS +//config: bool "Support mounting NFS file systems on Linux < 2.6.23" +//config: default n +//config: depends on MOUNT +//config: select FEATURE_HAVE_RPC +//config: select FEATURE_SYSLOG +//config: help +//config: Enable mounting of NFS file systems on Linux kernels prior +//config: to version 2.6.23. Note that in this case mounting of NFS +//config: over IPv6 will not be possible. +//config: +//config: Note that this option links in RPC support from libc, +//config: which is rather large (~10 kbytes on uclibc). +//config: +//config:config FEATURE_MOUNT_CIFS +//config: bool "Support mounting CIFS/SMB file systems" +//config: default y +//config: depends on MOUNT +//config: help +//config: Enable support for samba mounts. +//config: +//config:config FEATURE_MOUNT_FLAGS +//config: depends on MOUNT +//config: bool "Support lots of -o flags in mount" +//config: default y +//config: help +//config: Without this, mount only supports ro/rw/remount. With this, it +//config: supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime, +//config: noatime, diratime, nodiratime, loud, bind, move, shared, slave, +//config: private, unbindable, rshared, rslave, rprivate, and runbindable. +//config: +//config:config FEATURE_MOUNT_FSTAB +//config: depends on MOUNT +//config: bool "Support /etc/fstab and -a" +//config: default y +//config: help +//config: Support mount all and looking for files in /etc/fstab. +//config: +//config:config FEATURE_MOUNT_OTHERTAB +//config: depends on FEATURE_MOUNT_FSTAB +//config: bool "Support -T <alt_fstab>" +//config: default y +//config: help +//config: Support mount -T (specifying an alternate fstab) + //usage:#define mount_trivial_usage -//usage: "[OPTIONS] [-o OPTS] DEVICE NODE" +//usage: "[OPTIONS] [-o OPT] DEVICE NODE" //usage:#define mount_full_usage "\n\n" //usage: "Mount a filesystem. Filesystem autodetection requires /proc.\n" //usage: "\n -a Mount all filesystems in fstab" @@ -41,8 +136,11 @@ //usage: ) ////usage: "\n -s Sloppy (ignored)" //usage: "\n -r Read-only mount" -//usage: "\n -w Read-write mount (default)" +////usage: "\n -w Read-write mount (default)" //usage: "\n -t FSTYPE[,...] Filesystem type(s)" +//usage: IF_FEATURE_MOUNT_OTHERTAB( +//usage: "\n -T FILE Read FILE instead of /etc/fstab" +//usage: ) //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)" //usage: "\n-o OPT:" //usage: IF_FEATURE_MOUNT_LOOP( @@ -64,7 +162,7 @@ //usage: "\n move Relocate an existing mount point" //usage: ) //usage: "\n remount Remount a mounted filesystem, changing flags" -//usage: "\n ro/rw Same as -r/-w" +//usage: "\n ro Same as -r" //usage: "\n" //usage: "\nThere are filesystem-specific -o flags." //usage: @@ -167,7 +265,7 @@ enum { }; -#define OPTION_STR "o:t:rwanfvsiO:" +#define OPTION_STR "o:t:rwanfvsiO:" IF_FEATURE_MOUNT_OTHERTAB("T:") enum { OPT_o = (1 << 0), OPT_t = (1 << 1), @@ -180,6 +278,7 @@ enum { OPT_s = (1 << 8), OPT_i = (1 << 9), OPT_O = (1 << 10), + OPT_T = (1 << 11), }; #if ENABLE_FEATURE_MTAB_SUPPORT @@ -2034,7 +2133,7 @@ int mount_main(int argc UNUSED_PARAM, char **argv) char *O_optmatch = NULL; char *storage_path; llist_t *lst_o = NULL; - const char *fstabname; + const char *fstabname = "/etc/fstab"; FILE *fstab; int i, j; int rc = EXIT_SUCCESS; @@ -2061,6 +2160,7 @@ int mount_main(int argc UNUSED_PARAM, char **argv) // Max 2 params; -o is a list, -v is a counter opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv"); opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch + IF_FEATURE_MOUNT_OTHERTAB(, &fstabname) IF_FEATURE_MOUNT_VERBOSE(, &verbose)); while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r @@ -2128,8 +2228,10 @@ int mount_main(int argc UNUSED_PARAM, char **argv) return rc; } + // A malicious user could overmount /usr without this. + if (ENABLE_FEATURE_MOUNT_OTHERTAB && nonroot) + fstabname = "/etc/fstab"; // Open either fstab or mtab - fstabname = "/etc/fstab"; if (cmdopt_flags & MS_REMOUNT) { // WARNING. I am not sure this matches util-linux's // behavior. It's possible util-linux does not |