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authorEric W. Biederman <ebiederm@xmission.com>2012-07-31 13:13:04 -0700
committerEric W. Biederman <ebiederm@xmission.com>2012-11-19 05:59:20 -0800
commit7a472ef4be8387bc05a42e16309b02c8ca943a40 (patch)
treed08fef7f89da670c24116805dbe1bcf60e094497 /fs/pnode.h
parent771b1371686e0a63e938ada28de020b9a0040f55 (diff)
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.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/pnode.h b/fs/pnode.h
index 65c60979d54..19b853a3445 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)
{