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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 15:18:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 15:18:57 -0700 |
| commit | c82ffab9a857f8286ed2b559624b7005a367b638 (patch) | |
| tree | a5d0895a0b55c2db1bf36f517ca273e7e0abdf71 /security | |
| parent | a724eada8c2a7b62463b73ccf73fd0bb6e928aeb (diff) | |
| parent | 5224ee086321fec78970e2f2805892d2b34e8957 (diff) | |
| download | linux-stable-c82ffab9a857f8286ed2b559624b7005a367b638.tar.gz linux-stable-c82ffab9a857f8286ed2b559624b7005a367b638.tar.bz2 linux-stable-c82ffab9a857f8286ed2b559624b7005a367b638.zip | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6:
SELinux: do not destroy the avc_cache_nodep
KEYS: Have the garbage collector set its timer for live expired keys
tpm-fixup-pcrs-sysfs-file-update
creds_are_invalid() needs to be exported for use by modules:
include/linux/cred.h: fix build
Fix trivial BUILD_BUG_ON-induced conflicts in drivers/char/tpm/tpm.c
Diffstat (limited to 'security')
| -rw-r--r-- | security/keys/gc.c | 4 | ||||
| -rw-r--r-- | security/selinux/avc.c | 19 |
2 files changed, 17 insertions, 6 deletions
diff --git a/security/keys/gc.c b/security/keys/gc.c index 485fc6233c38..4770be375ffe 100644 --- a/security/keys/gc.c +++ b/security/keys/gc.c @@ -169,9 +169,9 @@ static void key_garbage_collector(struct work_struct *work) /* trawl through the keys looking for keyrings */ for (;;) { - if (key->expiry > now && key->expiry < new_timer) { + if (key->expiry > limit && key->expiry < new_timer) { kdebug("will expire %x in %ld", - key_serial(key), key->expiry - now); + key_serial(key), key->expiry - limit); new_timer = key->expiry; } diff --git a/security/selinux/avc.c b/security/selinux/avc.c index 1ed0f076aadc..b4b5da1c0a42 100644 --- a/security/selinux/avc.c +++ b/security/selinux/avc.c @@ -868,8 +868,19 @@ u32 avc_policy_seqno(void) void avc_disable(void) { - avc_flush(); - synchronize_rcu(); - if (avc_node_cachep) - kmem_cache_destroy(avc_node_cachep); + /* + * If you are looking at this because you have realized that we are + * not destroying the avc_node_cachep it might be easy to fix, but + * I don't know the memory barrier semantics well enough to know. It's + * possible that some other task dereferenced security_ops when + * it still pointed to selinux operations. If that is the case it's + * possible that it is about to use the avc and is about to need the + * avc_node_cachep. I know I could wrap the security.c security_ops call + * in an rcu_lock, but seriously, it's not worth it. Instead I just flush + * the cache and get that memory back. + */ + if (avc_node_cachep) { + avc_flush(); + /* kmem_cache_destroy(avc_node_cachep); */ + } } |