fix deadlock in pivot_root()

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Don't hold vfsmount_lock over the loop traversing ->mnt_parent;
do check_mnt(new.mnt) under namespace_sem instead; combined with
namespace_sem held over all that code it'll guarantee the stability
of ->mnt_parent chain all the way to the root.

Doing check_mnt() outside of namespace_sem in case of pivot_root()
is wrong anyway.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Al Viro 2011-03-18 08:29:36 -04:00

parent 9d412a43c3

commit 27cb1572e3

1 changed files with 5 additions and 11 deletions

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fs/namespace.c

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