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authorEric Paris <eparis@redhat.com>2011-04-28 15:11:21 -0400
committerEric Paris <eparis@redhat.com>2011-04-28 15:15:52 -0400
commit03a4c0182a156547edd5f2717c1702590fe36bbf (patch)
treec4585fab7c37d4eb2cc46e93c925e7c2a5e7b1a2 /security/selinux/ss/services.c
parent2667991f60e67d28c495b8967aaabf84b4ccd560 (diff)
downloadop-kernel-dev-03a4c0182a156547edd5f2717c1702590fe36bbf.zip
op-kernel-dev-03a4c0182a156547edd5f2717c1702590fe36bbf.tar.gz
SELinux: skip filename trans rules if ttype does not match parent dir
Right now we walk to filename trans rule list for every inode that is created. First passes at policy using this facility creates around 5000 filename trans rules. Running a list of 5000 entries every time is a bad idea. This patch adds a new ebitmap to policy which has a bit set for each ttype that has at least 1 filename trans rule. Thus when an inode is created we can quickly determine if any rules exist for this parent directory type and can skip the list if we know there is definitely no relevant entry. Signed-off-by: Eric Paris <eparis@redhat.com> Reviewed-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/selinux/ss/services.c')
-rw-r--r--security/selinux/ss/services.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 78bb810..6a22eae 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1363,6 +1363,15 @@ static void filename_compute_type(struct policydb *p, struct context *newcontext
const char *objname)
{
struct filename_trans *ft;
+
+ /*
+ * Most filename trans rules are going to live in specific directories
+ * like /dev or /var/run. This bitmap will quickly skip rule searches
+ * if the ttype does not contain any rules.
+ */
+ if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype))
+ return;
+
for (ft = p->filename_trans; ft; ft = ft->next) {
if (ft->stype == stype &&
ft->ttype == ttype &&
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