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separate copying and locking mount tree on cross-userns copies

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Rather than having propagate_mnt() check doing unprivileged copies,
lock them before commit_tree().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-01-30 13:15:45 -05:00
parent 6d7fbce7da
commit 3bd045cc9c
3 changed files with 38 additions and 29 deletions
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3
fs/pnode.h
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@ -27,8 +27,7 @@
#define CL_MAKE_SHARED 0x08
#define CL_PRIVATE 0x10
#define CL_SHARED_TO_SLAVE 0x20
#define CL_UNPRIVILEGED 0x40
#define CL_COPY_MNT_NS_FILE 0x80
#define CL_COPY_MNT_NS_FILE 0x40
#define CL_COPY_ALL (CL_COPY_UNBINDABLE | CL_COPY_MNT_NS_FILE)