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authorAndreas Gruenbacher <agruenba@redhat.com>2016-01-06 01:12:33 +0300
committerPaul Moore <paul@paul-moore.com>2016-01-09 00:24:27 +0300
commitb197367ed1ba81b0d26f7e7f76f61731ac6e5842 (patch)
treeefc5fa3e91a36fd1e4de2aecdc37a697e7867a4d /security
parent76319946f321e30872dd72af7de867cb26e7a373 (diff)
downloadlinux-b197367ed1ba81b0d26f7e7f76f61731ac6e5842.tar.xz
selinux: Inode label revalidation performance fix
Commit 5d226df4 has introduced a performance regression of about 10% in the UnixBench pipe benchmark. It turns out that the call to inode_security in selinux_file_permission can be moved below the zero-mask test and that inode_security_revalidate can be removed entirely, which brings us back to roughly the original performance. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 40e071af7783..f8110cfd80ff 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -273,11 +273,6 @@ static int __inode_security_revalidate(struct inode *inode,
return 0;
}
-static void inode_security_revalidate(struct inode *inode)
-{
- __inode_security_revalidate(inode, NULL, true);
-}
-
static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
{
return inode->i_security;
@@ -3277,19 +3272,19 @@ static int selinux_file_permission(struct file *file, int mask)
{
struct inode *inode = file_inode(file);
struct file_security_struct *fsec = file->f_security;
- struct inode_security_struct *isec = inode_security(inode);
+ struct inode_security_struct *isec;
u32 sid = current_sid();
if (!mask)
/* No permission to check. Existence test. */
return 0;
+ isec = inode_security(inode);
if (sid == fsec->sid && fsec->isid == isec->sid &&
fsec->pseqno == avc_policy_seqno())
/* No change since file_open check. */
return 0;
- inode_security_revalidate(inode);
return selinux_revalidate_file_permission(file, mask);
}
@@ -3595,7 +3590,6 @@ static int selinux_file_open(struct file *file, const struct cred *cred)
* new inode label or new policy.
* This check is not redundant - do not remove.
*/
- inode_security_revalidate(file_inode(file));
return file_path_has_perm(cred, file, open_file_to_av(file));
}