diff options
| author |   Amir Goldstein <amir73il@gmail.com> | 2018-07-13 17:22:24 +0300 |
|---|---|---|
| committer |   J. Bruce Fields <bfields@redhat.com> | 2018-08-09 16:11:21 -0400 |
| commit | 64bed6cbe38bc95689fb9399872d9ce250192f90 (patch) | |
| tree | 6376a71e746622c32818abd785c05a09593a01a8 /fs/lockd/svc4proc.c | |
| parent | nfsd: don't advertise a SCSI layout for an unsupported request_queue (diff) | |
| download | linux-dev-64bed6cbe38bc95689fb9399872d9ce250192f90.tar.xz linux-dev-64bed6cbe38bc95689fb9399872d9ce250192f90.zip | |
nfsd: fix leaked file lock with nfs exported overlayfs
nfsd and lockd call vfs_lock_file() to lock/unlock the inode
returned by locks_inode(file).
Many places in nfsd/lockd code use the inode returned by
file_inode(file) for lock manipulation. With Overlayfs, file_inode()
(the underlying inode) is not the same object as locks_inode() (the
overlay inode). This can result in "Leaked POSIX lock" messages
and eventually to a kernel crash as reported by Eddie Horng:
https://marc.info/?l=linux-unionfs&m=153086643202072&w=2
Fix all the call sites in nfsd/lockd that should use locks_inode().
This is a correctness bug that manifested when overlayfs gained
NFS export support in v4.16.
Reported-by: Eddie Horng <eddiehorng.tw@gmail.com>
Tested-by: Eddie Horng <eddiehorng.tw@gmail.com>
Cc: Jeff Layton <jlayton@kernel.org>
Fixes: 8383f1748829 ("ovl: wire up NFS export operations")
Cc: stable@vger.kernel.org
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/lockd/svc4proc.c')
0 files changed, 0 insertions, 0 deletions