diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-05-27 11:06:05 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-05-27 20:09:16 -0400 |
| commit | 3767e255b390d72f9a33c08d9e86c5f21f25860f (patch) | |
| tree | 519dcbb61591a2ad94c36d3896e4787074e4813d /Documentation | |
| parent | 5930122683dff58f0846b0f0405b4bd598a3ba6a (diff) | |
| download | lwn-3767e255b390d72f9a33c08d9e86c5f21f25860f.tar.gz lwn-3767e255b390d72f9a33c08d9e86c5f21f25860f.zip | |
switch ->setxattr() to passing dentry and inode separately
smack ->d_instantiate() uses ->setxattr(), so to be able to call it before
we'd hashed the new dentry and attached it to inode, we need ->setxattr()
instances getting the inode as an explicit argument rather than obtaining
it from dentry.
Similar change for ->getxattr() had been done in commit ce23e64. Unlike
->getxattr() (which is used by both selinux and smack instances of
->d_instantiate()) ->setxattr() is used only by smack one and unfortunately
it got missed back then.
Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Tested-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/porting | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index 46f3bb7a02f5..a5fb89cac615 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -578,3 +578,10 @@ in your dentry operations instead. -- [mandatory] ->atomic_open() calls without O_CREAT may happen in parallel. +-- +[mandatory] + ->setxattr() and xattr_handler.set() get dentry and inode passed separately. + dentry might be yet to be attached to inode, so do _not_ use its ->d_inode + in the instances. Rationale: !@#!@# security_d_instantiate() needs to be + called before we attach dentry to inode and !@#!@##!@$!$#!@#$!@$!@$ smack + ->d_instantiate() uses not just ->getxattr() but ->setxattr() as well. |