From 4cf801b8537276103a09d44dad31f637164916e7 Mon Sep 17 00:00:00 2001 From: cinap_lenrek Date: Wed, 6 Jan 2016 03:58:04 +0100 Subject: add missing /sys/src/cmd/auth/lib/private.c --- sys/src/cmd/auth/lib/private.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 sys/src/cmd/auth/lib/private.c diff --git a/sys/src/cmd/auth/lib/private.c b/sys/src/cmd/auth/lib/private.c new file mode 100644 index 000000000..392842c0d --- /dev/null +++ b/sys/src/cmd/auth/lib/private.c @@ -0,0 +1,28 @@ +#include +#include +#include +#include +#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); +} -- cgit v1.2.3