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authorDavid S. Miller <davem@davemloft.net>2009-09-24 15:13:11 -0700
committerDavid S. Miller <davem@davemloft.net>2009-09-24 15:13:11 -0700
commit8b3f6af86378d0a10ca2f1ded1da124aef13b62c (patch)
treede6ca90295730343c495be8d98be8efa322140ef /kernel/cred.c
parent139d6065c83071d5f66cd013a274a43699f8e2c1 (diff)
parent94e0fb086fc5663c38bbc0fe86d698be8314f82f (diff)
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Conflicts: drivers/staging/Kconfig drivers/staging/Makefile drivers/staging/cpc-usb/TODO drivers/staging/cpc-usb/cpc-usb_drv.c drivers/staging/cpc-usb/cpc.h drivers/staging/cpc-usb/cpc_int.h drivers/staging/cpc-usb/cpcusb.h
Diffstat (limited to 'kernel/cred.c')
-rw-r--r--kernel/cred.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/kernel/cred.c b/kernel/cred.c
index 006fcab009d..dd76cfe5f5b 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -147,7 +147,8 @@ static void put_cred_rcu(struct rcu_head *rcu)
key_put(cred->thread_keyring);
key_put(cred->request_key_auth);
release_tgcred(cred);
- put_group_info(cred->group_info);
+ if (cred->group_info)
+ put_group_info(cred->group_info);
free_uid(cred->user);
kmem_cache_free(cred_jar, cred);
}
@@ -781,6 +782,25 @@ EXPORT_SYMBOL(set_create_files_as);
#ifdef CONFIG_DEBUG_CREDENTIALS
+bool creds_are_invalid(const struct cred *cred)
+{
+ if (cred->magic != CRED_MAGIC)
+ return true;
+ if (atomic_read(&cred->usage) < atomic_read(&cred->subscribers))
+ return true;
+#ifdef CONFIG_SECURITY_SELINUX
+ if (selinux_is_enabled()) {
+ if ((unsigned long) cred->security < PAGE_SIZE)
+ return true;
+ if ((*(u32 *)cred->security & 0xffffff00) ==
+ (POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8))
+ return true;
+ }
+#endif
+ return false;
+}
+EXPORT_SYMBOL(creds_are_invalid);
+
/*
* dump invalid credentials
*/