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selinux: fix residual uses of current_security() for the SELinux blob 

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: bbd3662a83 ("Infrastructure management of the cred security blob")
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Stephen Smalley 2019-09-04 10:32:48 -04:00 committed by Paul Moore
parent 116f21bb96
commit 169ce0c081
2 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
security/selinux/hooks.c
View File

@ -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;

20
security/selinux/include/objsec.h
View File

@ -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_ */