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Commit 0c6181cb authored by Paul Moore's avatar Paul Moore
Browse files

selinux: consolidate the ptrace parent lookup code 



We lookup the tracing parent in two places, using effectively the
same code, let's consolidate it.

Signed-off-by: default avatarPaul Moore <paul@paul-moore.com>
parent 4b57d6bc

security/selinux/hooks.c

+17 −21
Original line number Diff line number Diff line
@@ -2229,6 +2229,20 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) 


/* binprm security operations */



static u32 ptrace_parent_sid(struct task_struct *task)

{

	u32 sid = 0;

	struct task_struct *tracer;



	rcu_read_lock();

	tracer = ptrace_parent(task);

	if (tracer)

		sid = task_sid(tracer);

	rcu_read_unlock();



	return sid;

}



static int check_nnp_nosuid(const struct linux_binprm *bprm,

			    const struct task_security_struct *old_tsec,

			    const struct task_security_struct *new_tsec)
@@ -2350,18 +2364,7 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm) 
		 * changes its SID has the appropriate permit */

		if (bprm->unsafe &

		    (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {

			struct task_struct *tracer;

			struct task_security_struct *sec;

			u32 ptsid = 0;



			rcu_read_lock();

			tracer = ptrace_parent(current);

			if (likely(tracer != NULL)) {

				sec = __task_cred(tracer)->security;

				ptsid = sec->sid;

			}

			rcu_read_unlock();



			u32 ptsid = ptrace_parent_sid(current);

			if (ptsid != 0) {

				rc = avc_has_perm(ptsid, new_tsec->sid,

						  SECCLASS_PROCESS,
@@ -5677,7 +5680,6 @@ static int selinux_setprocattr(struct task_struct *p, 
			       char *name, void *value, size_t size)

{

	struct task_security_struct *tsec;

	struct task_struct *tracer;

	struct cred *new;

	u32 sid = 0, ptsid;

	int error;
@@ -5784,14 +5786,8 @@ static int selinux_setprocattr(struct task_struct *p, 


		/* Check for ptracing, and update the task SID if ok.

		   Otherwise, leave SID unchanged and fail. */

		ptsid = 0;

		rcu_read_lock();

		tracer = ptrace_parent(p);

		if (tracer)

			ptsid = task_sid(tracer);

		rcu_read_unlock();



		if (tracer) {

		ptsid = ptrace_parent_sid(p);

		if (ptsid != 0) {

			error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,

					     PROCESS__PTRACE, NULL);

			if (error)