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| author | Yan, Zheng <zyan@redhat.com> | 2017-04-19 10:01:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-03 08:36:39 -0700 |
| commit | 36e0be3187c232e99ed460acc21283160d02f923 (patch) | |
| tree | 6528dcb2ae604e23128329b26a702e4e2a99c380 /block/blk-mq-sysfs.c | |
| parent | d7809b9e99bb75e83bdd13dc70ce27df61faf5de (diff) | |
ceph: fix recursion between ceph_set_acl() and __ceph_setattr()
commit 8179a101eb5f4ef0ac9a915fcea9a9d3109efa90 upstream.
ceph_set_acl() calls __ceph_setattr() if the setacl operation needs
to modify inode's i_mode. __ceph_setattr() updates inode's i_mode,
then calls posix_acl_chmod().
The problem is that __ceph_setattr() calls posix_acl_chmod() before
sending the setattr request. The get_acl() call in posix_acl_chmod()
can trigger a getxattr request. The reply of the getxattr request
can restore inode's i_mode to its old value. The set_acl() call in
posix_acl_chmod() sees old value of inode's i_mode, so it calls
__ceph_setattr() again.
Link: http://tracker.ceph.com/issues/19688
Reported-by: Jerry Lee <leisurelysw24@gmail.com>
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Tested-by: Luis Henriques <lhenriques@suse.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block/blk-mq-sysfs.c')
0 files changed, 0 insertions, 0 deletions