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authorMiklos Szeredi <mszeredi@suse.cz>2010-10-05 12:31:09 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2010-10-25 21:24:16 -0400
commitbe1a16a0ae29a7c90081a657b64aa51cb1a65a27 (patch)
tree18bef9178b1142d839b906ce3bf38c92eb650ee8 /fs/internal.h
parent89b0fc38cca4e6c92a90b58960881ffc5dddd89c (diff)
vfs: fix infinite loop caused by clone_mnt race
If clone_mnt() happens while mnt_make_readonly() is running, the cloned mount might have MNT_WRITE_HOLD flag set, which results in mnt_want_write() spinning forever on this mount. Needs CAP_SYS_ADMIN to trigger deliberately and unlikely to happen accidentally. But if it does happen it can hang the machine. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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