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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>
This commit is contained in:
Linus Torvalds 2011-05-24 13:48:51 -07:00
parent bc9bc72e2f
commit f01e1af445
2 changed files with 4 additions and 11 deletions
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12
security/selinux/avc.c
View File

@ -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;
}

3
security/selinux/ss/services.c
View File

@ -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();