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| author | Eric W. Biederman <ebiederm@xmission.com> | 2012-07-31 13:13:04 -0700 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-11-19 05:59:20 -0800 |
| commit | 7a472ef4be8387bc05a42e16309b02c8ca943a40 (patch) | |
| tree | d08fef7f89da670c24116805dbe1bcf60e094497 /fs/pnode.h | |
| parent | 771b1371686e0a63e938ada28de020b9a0040f55 (diff) | |
| download | lwn-7a472ef4be8387bc05a42e16309b02c8ca943a40.tar.gz lwn-7a472ef4be8387bc05a42e16309b02c8ca943a40.zip | |
vfs: Only support slave subtrees across different user namespaces
Sharing mount subtress with mount namespaces created by unprivileged
users allows unprivileged mounts created by unprivileged users to
propagate to mount namespaces controlled by privileged users.
Prevent nasty consequences by changing shared subtrees to slave
subtress when an unprivileged users creates a new mount namespace.
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/pnode.h')
| -rw-r--r-- | fs/pnode.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/pnode.h b/fs/pnode.h index 65c60979d541..19b853a3445c 100644 --- a/fs/pnode.h +++ b/fs/pnode.h @@ -22,6 +22,7 @@ #define CL_COPY_ALL 0x04 #define CL_MAKE_SHARED 0x08 #define CL_PRIVATE 0x10 +#define CL_SHARED_TO_SLAVE 0x20 static inline void set_mnt_shared(struct mount *mnt) { |