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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-24 13:48:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-26 18:13:57 -0700 |
| commit | f01e1af445fac107e91d62a2d59dd535f633810b (patch) | |
| tree | f5da7e4162f0a6f4bb50e4cb41f6a06c672f66b0 /security | |
| parent | bc9bc72e2f9bb07384c00604d1a40d0b5f62be6c (diff) | |
| download | lwn-f01e1af445fac107e91d62a2d59dd535f633810b.tar.gz lwn-f01e1af445fac107e91d62a2d59dd535f633810b.zip | |
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.c | 12 | ||||
| -rw-r--r-- | security/selinux/ss/services.c | 3 |
2 files changed, 4 insertions, 11 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c index fcb89cb0f223..d515b2128a4e 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 c3e4b52699f4..973e00e34fa9 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(); |