1 files changed, 0 insertions, 55 deletions
diff --git a/source/a/shadow/shadow.CVE-2017-2616.diff b/source/a/shadow/shadow.CVE-2017-2616.diff
deleted file mode 100644
index 4a5c4422..00000000
--- a/source/a/shadow/shadow.CVE-2017-2616.diff
+++ /dev/null
@@ -1,55 +0,0 @@
-su: properly clear child PID
-
-If su is compiled with PAM support, it is possible for any local user
-to send SIGKILL to other processes with root privileges. There are
-only two conditions. First, the user must be able to perform su with
-a successful login. This does NOT have to be the root user, even using
-su with the same id is enough, e.g. "su $(whoami)". Second, SIGKILL
-can only be sent to processes which were executed after the su process.
-It is not possible to send SIGKILL to processes which were already
-running. I consider this as a security vulnerability, because I was
-able to write a proof of concept which unlocked a screen saver of
-another user this way.
-
-diff --git a/src/su.c b/src/su.c
-index f20d230..d86aa86 100644
---- a/src/su.c
-+++ b/src/su.c
-@@ -379,11 +379,13 @@ static void prepare_pam_close_session (void)
- 				/* wake child when resumed */
- 				kill (pid, SIGCONT);
- 				stop = false;
-+			} else {
-+				pid_child = 0;
- 			}
- 		} while (!stop);
- 	}
- 
--	if (0 != caught) {
-+	if (0 != caught && 0 != pid_child) {
- 		(void) fputs ("\n", stderr);
- 		(void) fputs (_("Session terminated, terminating shell..."),
- 		              stderr);
-@@ -393,9 +395,22 @@ static void prepare_pam_close_session (void)
- 		snprintf (wait_msg, sizeof wait_msg, _(" ...waiting for child to terminate.\n"));
- 
- 		(void) signal (SIGALRM, kill_child);
-+		(void) signal (SIGCHLD, catch_signals);
- 		(void) alarm (2);
- 
--		(void) wait (&status);
-+		sigemptyset (&ourset);
-+		if ((sigaddset (&ourset, SIGALRM) != 0)
-+		    || (sigprocmask (SIG_BLOCK, &ourset, NULL) != 0)) {
-+			fprintf (stderr, _("%s: signal masking malfunction\n"), Prog);
-+			kill_child (0);
-+		} else {
-+			while (0 == waitpid (pid_child, &status, WNOHANG)) {
-+				sigsuspend (&ourset);
-+			}
-+			pid_child = 0;
-+			(void) sigprocmask (SIG_UNBLOCK, &ourset, NULL);
-+		}
-+
- 		(void) fputs (_(" ...terminated.\n"), stderr);
- 	}