From: Stephen Smalley <sds@tycho.nsa.gov>
To: paul@paul-moore.com
Cc: keescook@chromium.org, casey@schaufler-ca.com,
selinux@vger.kernel.org, linux-security-module@vger.kernel.org,
jmorris@namei.org, dhowells@redhat.com,
Stephen Smalley <sds@tycho.nsa.gov>
Subject: [PATCH] selinux: fix residual uses of current_security() for the SELinux blob
Date: Wed, 4 Sep 2019 10:32:48 -0400 [thread overview]
Message-ID: <20190904143248.7003-1-sds@tycho.nsa.gov> (raw)
We need to use selinux_cred() to fetch the SELinux cred blob instead
of directly using current->security or current_security(). There
were a couple of lingering uses of current_security() in the SELinux code
that were apparently missed during the earlier conversions. IIUC, this
would only manifest as a bug if multiple security modules including
SELinux are enabled and SELinux is not first in the lsm order. After
this change, there appear to be no other users of current_security()
in-tree; perhaps we should remove it altogether.
Fixes: bbd3662a8348 ("Infrastructure management of the cred security blob")
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
---
security/selinux/hooks.c | 2 +-
security/selinux/include/objsec.h | 20 ++++++++++----------
2 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index d55571c585ff..f1b763eceef9 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3435,7 +3435,7 @@ static int selinux_inode_copy_up_xattr(const char *name)
static int selinux_kernfs_init_security(struct kernfs_node *kn_dir,
struct kernfs_node *kn)
{
- const struct task_security_struct *tsec = current_security();
+ const struct task_security_struct *tsec = selinux_cred(current_cred());
u32 parent_sid, newsid, clen;
int rc;
char *context;
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index 231262d8eac9..d2e00c7595dd 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -40,16 +40,6 @@ struct task_security_struct {
u32 sockcreate_sid; /* fscreate SID */
};
-/*
- * get the subjective security ID of the current task
- */
-static inline u32 current_sid(void)
-{
- const struct task_security_struct *tsec = current_security();
-
- return tsec->sid;
-}
-
enum label_initialized {
LABEL_INVALID, /* invalid or not initialized */
LABEL_INITIALIZED, /* initialized */
@@ -188,4 +178,14 @@ static inline struct ipc_security_struct *selinux_ipc(
return ipc->security + selinux_blob_sizes.lbs_ipc;
}
+/*
+ * get the subjective security ID of the current task
+ */
+static inline u32 current_sid(void)
+{
+ const struct task_security_struct *tsec = selinux_cred(current_cred());
+
+ return tsec->sid;
+}
+
#endif /* _SELINUX_OBJSEC_H_ */
--
2.21.0
next reply other threads:[~2019-09-04 14:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-04 14:32 Stephen Smalley [this message]
2019-09-04 15:16 ` [PATCH] selinux: fix residual uses of current_security() for the SELinux blob Casey Schaufler
2019-09-04 15:31 ` Stephen Smalley
2019-09-04 16:46 ` John Johansen
2019-09-04 19:35 ` James Morris
2019-09-04 22:50 ` Paul Moore
2019-09-05 20:01 ` Stephen Smalley
2019-09-05 20:55 ` James Morris
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