tree cbe2d2a360aaf7dc243bef432e1c50507ae6db7b
parent 3232c110b56bd01c5f0fdfd16b4d695f2e05b0a9
author Yuichi Nakamura <ynakam@hitachisoft.jp> 1189729627 +0900
committer James Morris <jmorris@namei.org> 1192575571 +1000

SELinux: Improve read/write performance

It reduces the selinux overhead on read/write by only revalidating
permissions in selinux_file_permission if the task or inode labels have
changed or the policy has changed since the open-time check.  A new LSM
hook, security_dentry_open, is added to capture the necessary state at open
time to allow this optimization.

(see http://marc.info/?l=selinux&m=118972995207740&w=2)

Signed-off-by: Yuichi Nakamura<ynakam@hitachisoft.jp>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>