ceph: fix recursion between ceph_set_acl() and __ceph_setattr()
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. Cc: stable@vger.kernel.org # needs backporting for < 4.9 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>
This commit is contained in:
parent
5a7ad1146c
commit
8179a101eb
|
@ -2071,11 +2071,6 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr)
|
|||
if (inode_dirty_flags)
|
||||
__mark_inode_dirty(inode, inode_dirty_flags);
|
||||
|
||||
if (ia_valid & ATTR_MODE) {
|
||||
err = posix_acl_chmod(inode, attr->ia_mode);
|
||||
if (err)
|
||||
goto out_put;
|
||||
}
|
||||
|
||||
if (mask) {
|
||||
req->r_inode = inode;
|
||||
|
@ -2089,13 +2084,11 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr)
|
|||
ceph_cap_string(dirtied), mask);
|
||||
|
||||
ceph_mdsc_put_request(req);
|
||||
if (mask & CEPH_SETATTR_SIZE)
|
||||
ceph_free_cap_flush(prealloc_cf);
|
||||
|
||||
if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
|
||||
__ceph_do_pending_vmtruncate(inode);
|
||||
ceph_free_cap_flush(prealloc_cf);
|
||||
return err;
|
||||
out_put:
|
||||
ceph_mdsc_put_request(req);
|
||||
ceph_free_cap_flush(prealloc_cf);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
|
@ -2114,7 +2107,12 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
|
|||
if (err != 0)
|
||||
return err;
|
||||
|
||||
return __ceph_setattr(inode, attr);
|
||||
err = __ceph_setattr(inode, attr);
|
||||
|
||||
if (err >= 0 && (attr->ia_valid & ATTR_MODE))
|
||||
err = posix_acl_chmod(inode, attr->ia_mode);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
Loading…
Reference in a new issue