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| author | Karel Zak | 2018-05-28 15:46:28 +0200 |
|---|---|---|
| committer | Karel Zak | 2018-05-28 16:15:30 +0200 |
| commit | e82b77e9696a6dada96a7f3ea3ec20a63e8e7b9e (patch) | |
| tree | 26ca04f758a4b66aca2dac4602394966bf87dd3b /libmount/src/mountP.h | |
| parent | mountpoint: simplify test condition [cppcheck] (diff) | |
| download | kernel-qcow2-util-linux-e82b77e9696a6dada96a7f3ea3ec20a63e8e7b9e.tar.gz kernel-qcow2-util-linux-e82b77e9696a6dada96a7f3ea3ec20a63e8e7b9e.tar.xz kernel-qcow2-util-linux-e82b77e9696a6dada96a7f3ea3ec20a63e8e7b9e.zip | |
libmount: accept another flags on MS_REMOUNT|MS_BIND
The current libmount MS_REMOUNT|MS_BIND support is restricted to
MS_RDONLY (read-only bind mount). This is too restrictive as Linux
kernel supports bind-remount for arbitrary VFS flags.
After this update you can use
# mount /dev/sdc1 /mnt/A
# mount --bind -onosuid,noexec /mnt/A /mnt/B
# findmnt /dev/sdc1 -oTARGET,SOURCE,FS-OPTIONS,VFS-OPTIONS
TARGET SOURCE FS-OPTIONS VFS-OPTIONS
/mnt/A /dev/sdc1 rw,stripe=512,data=ordered rw,relatime
/mnt/B /dev/sdc1 rw,stripe=512,data=ordered rw,nosuid,noexec,relatime
The "mount --bind" is composed from two syscalls of course (1st is
bind, 2nd is bind,remount,nosuid,noexec).
Addresses: https://github.com/karelzak/util-linux/issues/637
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'libmount/src/mountP.h')
| -rw-r--r-- | libmount/src/mountP.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libmount/src/mountP.h b/libmount/src/mountP.h index d47d26442..4ce891cda 100644 --- a/libmount/src/mountP.h +++ b/libmount/src/mountP.h @@ -361,6 +361,9 @@ struct libmnt_context /* default flags */ #define MNT_FL_DEFAULT 0 +/* Flags usable with MS_BIND|MS_REMOUNT */ +#define MNT_BIND_SETTABLE (MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_NOATIME|MS_NODIRATIME|MS_RELATIME|MS_RDONLY) + /* lock.c */ extern int mnt_lock_use_simplelock(struct libmnt_lock *ml, int enable); |