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authorAl Viro <viro@zeniv.linux.org.uk>2012-09-21 08:19:02 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-09-22 20:48:18 -0400
commit156cacb1d0d36b0d0582d9e798e58e0044f516b3 (patch)
tree79eddbde8671b1899d77dcfabb3ae3e21ce39072 /fs/lockd
parentfea7a08acb13524b47711625eebea40a0ede69a0 (diff)
do_add_mount()/umount -l races
normally we deal with lock_mount()/umount races by checking that mountpoint to be is still in our namespace after lock_mount() has been done. However, do_add_mount() skips that check when called with MNT_SHRINKABLE in flags (i.e. from finish_automount()). The reason is that ->mnt_ns may be a temporary namespace created exactly to contain automounts a-la NFS4 referral handling. It's not the namespace of the caller, though, so check_mnt() would fail here. We still need to check that ->mnt_ns is non-NULL in that case, though. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/lockd')
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