X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=security%2Fcommoncap.c;h=48071ed7c445d025fa4ae57c12f032bfa916521f;hb=99d4c5fe0b7838de15c59b375491ef075848d92d;hp=1832cf701c3d6d44d90adeb278bd04bca489d274;hpb=ef41a2cedb14871203ee28d7a5cb5aafe4e97439;p=firefly-linux-kernel-4.4.55.git

diff --git a/security/commoncap.c b/security/commoncap.c
index 1832cf701c3d..48071ed7c445 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -137,12 +137,17 @@ int cap_ptrace_access_check(struct task_struct *child, unsigned int mode)
 {
 	int ret = 0;
 	const struct cred *cred, *child_cred;
+	const kernel_cap_t *caller_caps;
 
 	rcu_read_lock();
 	cred = current_cred();
 	child_cred = __task_cred(child);
+	if (mode & PTRACE_MODE_FSCREDS)
+		caller_caps = &cred->cap_effective;
+	else
+		caller_caps = &cred->cap_permitted;
 	if (cred->user_ns == child_cred->user_ns &&
-	    cap_issubset(child_cred->cap_permitted, cred->cap_permitted))
+	    cap_issubset(child_cred->cap_permitted, *caller_caps))
 		goto out;
 	if (ns_capable(child_cred->user_ns, CAP_SYS_PTRACE))
 		goto out;