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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-24 13:48:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-26 18:13:57 -0700
commitf01e1af445fac107e91d62a2d59dd535f633810b (patch)
treef5da7e4162f0a6f4bb50e4cb41f6a06c672f66b0 /security
parentbc9bc72e2f9bb07384c00604d1a40d0b5f62be6c (diff)
downloadlinux-linaro-precise-f01e1af445fac107e91d62a2d59dd535f633810b.tar.gz
selinux: don't pass in NULL avd to avc_has_perm_noaudit
Right now security_get_user_sids() will pass in a NULL avd pointer to avc_has_perm_noaudit(), which then forces that function to have a dummy entry for that case and just generally test it. Don't do it. The normal callers all pass a real avd pointer, and this helper function is incredibly hot. So don't make avc_has_perm_noaudit() do conditional stuff that isn't needed for the common case. This also avoids some duplicated stack space. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/avc.c12
-rw-r--r--security/selinux/ss/services.c3
2 files changed, 4 insertions, 11 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index fcb89cb0f22..d515b2128a4 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -752,10 +752,9 @@ int avc_ss_reset(u32 seqno)
int avc_has_perm_noaudit(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
unsigned flags,
- struct av_decision *in_avd)
+ struct av_decision *avd)
{
struct avc_node *node;
- struct av_decision avd_entry, *avd;
int rc = 0;
u32 denied;
@@ -766,18 +765,11 @@ int avc_has_perm_noaudit(u32 ssid, u32 tsid,
node = avc_lookup(ssid, tsid, tclass);
if (unlikely(!node)) {
rcu_read_unlock();
-
- if (in_avd)
- avd = in_avd;
- else
- avd = &avd_entry;
-
security_compute_av(ssid, tsid, tclass, avd);
rcu_read_lock();
node = avc_insert(ssid, tsid, tclass, avd);
} else {
- if (in_avd)
- memcpy(in_avd, &node->ae.avd, sizeof(*in_avd));
+ memcpy(avd, &node->ae.avd, sizeof(*avd));
avd = &node->ae.avd;
}
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index c3e4b52699f..973e00e34fa 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -2217,10 +2217,11 @@ out_unlock:
goto out;
}
for (i = 0, j = 0; i < mynel; i++) {
+ struct av_decision dummy_avd;
rc = avc_has_perm_noaudit(fromsid, mysids[i],
SECCLASS_PROCESS, /* kernel value */
PROCESS__TRANSITION, AVC_STRICT,
- NULL);
+ &dummy_avd);
if (!rc)
mysids2[j++] = mysids[i];
cond_resched();