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authorEric Paris <eparis@redhat.com>2009-09-12 22:54:10 -0400
committerJames Morris <jmorris@namei.org>2009-09-14 12:34:07 +1000
commited868a56988464cd31de0302426a5e94d3127f10 (patch)
treecdcd1715445aa19051b6a9a671b39250a449333a
parent86d710146fb9975f04c505ec78caa43d227c1018 (diff)
downloadlinux-2.6.38-lt-ux500-ed868a56988464cd31de0302426a5e94d3127f10.tar.gz
Creds: creds->security can be NULL is selinux is disabled
__validate_process_creds should check if selinux is actually enabled before running tests on the selinux portion of the credentials struct. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
-rw-r--r--include/linux/cred.h13
-rw-r--r--include/linux/selinux.h9
-rw-r--r--security/selinux/exports.c6
3 files changed, 23 insertions, 5 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h
index 24520a539c6..fb371601a3b 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -15,6 +15,7 @@
#include <linux/capability.h>
#include <linux/init.h>
#include <linux/key.h>
+#include <linux/selinux.h>
#include <asm/atomic.h>
struct user_struct;
@@ -182,11 +183,13 @@ static inline bool creds_are_invalid(const struct cred *cred)
if (atomic_read(&cred->usage) < atomic_read(&cred->subscribers))
return true;
#ifdef CONFIG_SECURITY_SELINUX
- 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;
+ 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;
}
diff --git a/include/linux/selinux.h b/include/linux/selinux.h
index 20f965d4b04..223d06a6feb 100644
--- a/include/linux/selinux.h
+++ b/include/linux/selinux.h
@@ -61,6 +61,11 @@ void selinux_secmark_refcount_inc(void);
* existing SECMARK targets has been removed/flushed.
*/
void selinux_secmark_refcount_dec(void);
+
+/**
+ * selinux_is_enabled - is SELinux enabled?
+ */
+bool selinux_is_enabled(void);
#else
static inline int selinux_string_to_sid(const char *str, u32 *sid)
@@ -84,6 +89,10 @@ static inline void selinux_secmark_refcount_dec(void)
return;
}
+static bool selinux_is_enabled(void)
+{
+ return false;
+}
#endif /* CONFIG_SECURITY_SELINUX */
#endif /* _LINUX_SELINUX_H */
diff --git a/security/selinux/exports.c b/security/selinux/exports.c
index c73aeaa008e..c0a454aee1e 100644
--- a/security/selinux/exports.c
+++ b/security/selinux/exports.c
@@ -63,3 +63,9 @@ void selinux_secmark_refcount_dec(void)
atomic_dec(&selinux_secmark_refcount);
}
EXPORT_SYMBOL_GPL(selinux_secmark_refcount_dec);
+
+bool selinux_is_enabled(void)
+{
+ return selinux_enabled;
+}
+EXPORT_SYMBOL_GPL(selinux_is_enabled);