ref: cd747191012d0420ac631340d962da1f80cef0a5
parent: 3735cc9bc3a44b53d0c639493f21cf4d29be1136
parent: 4cf801b8537276103a09d44dad31f637164916e7
author: cinap_lenrek <[email protected]>
date: Tue Jan 5 22:59:40 EST 2016
merge
--- /dev/null
+++ b/sys/src/cmd/auth/lib/private.c
@@ -1,0 +1,28 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <authsrv.h>
+#include "authcmdlib.h"
+
+static char *pmsg = "Warning! %s can't protect itself from debugging: %r\n";
+static char *smsg = "Warning! %s can't turn off swapping: %r\n";
+
+/* don't allow other processes to debug us and steal keys */
+void
+private(void)
+{+ int fd;
+ char buf[64];
+
+ snprint(buf, sizeof(buf), "#p/%d/ctl", getpid());
+ fd = open(buf, OWRITE);
+ if(fd < 0){+ fprint(2, pmsg, argv0);
+ return;
+ }
+ if(fprint(fd, "private") < 0)
+ fprint(2, pmsg, argv0);
+ if(fprint(fd, "noswap") < 0)
+ fprint(2, smsg, argv0);
+ close(fd);
+}