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| author | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-18 08:29:36 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-27 11:36:25 -0700 |
| commit | 305c88ab06302e186aba8376a2b5c579a5c92291 (patch) | |
| tree | 5e8b4203fdb5cf48275e267fbadecacb489a9420 /mm | |
| parent | 98f637b2ec791ddec58d90f9706feac2c5011ed8 (diff) | |
fix deadlock in pivot_root()
commit 27cb1572e3e6bb1f8cf6bb3d74c914a87b131792 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions