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[ Upstream commit 5f31c549382bcddbbd754c72c5433b19420d485d ] Holding namespace_sem is enough to make sure that result remains valid. It is *not* enough to avoid false negatives from __lookup_mnt(). Mounts can be unhashed outside of namespace_sem (stuck children getting detached on final mntput() of lazy-umounted mount) and having an unrelated mount removed from the hash chain while we traverse it may end up with false negative from __lookup_mnt(). We need to sample and recheck the seqlock component of mount_lock... Bug predates the introduction of path_overmount() - it had come from the code in finish_automount() that got abstracted into that helper. Reviewed-by: Christian Brauner <brauner@kernel.org> Fixes:26df6034fd("fix automount/automount race properly") Fixes:6ac3928156("fs: allow to mount beneath top mount") Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.