ksmbd: check if a mount point is crossed during path lookup

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commit 2b57a4322b upstream.

Since commit 74d7970feb ("ksmbd: fix racy issue from using ->d_parent and
->d_name"), ksmbd can not lookup cross mount points. If last component is
a cross mount point during path lookup, check if it is crossed to follow it
down. And allow path lookup to cross a mount point when a crossmnt
parameter is set to 'yes' in smb.conf.

Cc: stable@vger.kernel.org
Fixes: 74d7970feb ("ksmbd: fix racy issue from using ->d_parent and ->d_name")
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Namjae Jeon 2023-07-17 08:37:40 +09:00 • committed by Greg Kroah-Hartman

parent 293f39e1d0

commit 0e625d2733

4 changed files with 53 additions and 39 deletions

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3

fs/smb/server/ksmbd_netlink.h

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27

fs/smb/server/smb2pdu.c

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58

fs/smb/server/vfs.c

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4

fs/smb/server/vfs.h

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