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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<[email protected]>
Acked-by: Stephen Smalley <[email protected]>
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
Yuichi Nakamura 2007-09-14 09:27:07 +09:00 • committed by James Morris
commit 788e7dd4c2
7 changed files with 89 additions and 1 deletions
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4
fs/open.c
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@ -757,6 +757,10 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
error = security_dentry_open(f);
if (error)
goto cleanup_all;
if (!open && f->f_op)
open = f->f_op->open;
if (open) {