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authorAndrew Morton <akpm@linux-foundation.org>2009-09-17 17:47:12 -0700
committerJames Morris <jmorris@namei.org>2009-09-23 11:01:25 -0700
commit74908a0009eb36054190ab80deb9671014efed96 (patch)
treec763a2ca3e5fa4d9b356ab1fe1f1f85da4321109 /kernel/cred.c
parent43c1266ce4dc06bfd236cec31e11e9ecd69c0bef (diff)
downloadlinux-74908a0009eb36054190ab80deb9671014efed96.tar.gz
include/linux/cred.h: fix build
mips allmodconfig: include/linux/cred.h: In function `creds_are_invalid': include/linux/cred.h:187: error: `PAGE_SIZE' undeclared (first use in this function) include/linux/cred.h:187: error: (Each undeclared identifier is reported only once include/linux/cred.h:187: error: for each function it appears in.) Fixes commit b6dff3ec5e116e3af6f537d4caedcad6b9e5082a Author: David Howells <dhowells@redhat.com> AuthorDate: Fri Nov 14 10:39:16 2008 +1100 Commit: James Morris <jmorris@namei.org> CommitDate: Fri Nov 14 10:39:16 2008 +1100 CRED: Separate task security context from task_struct I think. It's way too large to be inlined anyway. Dunno if this needs an EXPORT_SYMBOL() yet. Cc: David Howells <dhowells@redhat.com> Cc: James Morris <jmorris@namei.org> Cc: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'kernel/cred.c')
-rw-r--r--kernel/cred.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/cred.c b/kernel/cred.c
index d7f7a01082e..70bda79fae2 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -782,6 +782,24 @@ 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;
+}
+
/*
* dump invalid credentials
*/