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SELinux: Improve read/write performance

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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>
This commit is contained in:
Yuichi Nakamura
2007-09-14 09:27:07 +09:00
committed by James Morris
parent 3232c110b5
commit 788e7dd4c2
7 changed files with 89 additions and 1 deletions
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6
security/dummy.c
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@@ -463,6 +463,11 @@ static int dummy_file_receive (struct file *file)
return 0;
}
static int dummy_dentry_open (struct file *file)
{
return 0;
}
static int dummy_task_create (unsigned long clone_flags)
{
return 0;
@@ -1033,6 +1038,7 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, file_set_fowner);
set_to_dummy_if_null(ops, file_send_sigiotask);
set_to_dummy_if_null(ops, file_receive);
set_to_dummy_if_null(ops, dentry_open);
set_to_dummy_if_null(ops, task_create);
set_to_dummy_if_null(ops, task_alloc_security);
set_to_dummy_if_null(ops, task_free_security);