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authorAl Viro <viro@zeniv.linux.org.uk>2016-05-27 11:06:05 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-27 20:09:16 -0400
commit3767e255b390d72f9a33c08d9e86c5f21f25860f (patch)
tree519dcbb61591a2ad94c36d3896e4787074e4813d /Documentation
parent5930122683dff58f0846b0f0405b4bd598a3ba6a (diff)
downloadlinux-3767e255b390d72f9a33c08d9e86c5f21f25860f.tar.gz
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/porting7
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.