git: 9front

ref: 0fcba1a2f0ec907683c005f7e9bef09e15163459
dir: /sys/src/cmd/auth/lib/private.c/

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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <authsrv.h>
#include "authcmdlib.h"

/* don't allow other processes to debug us and steal keys */
void
private(void)
{
	int fd;
	char buf[32];
	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";

	snprint(buf, sizeof(buf), "/proc/%d/ctl", getpid());
	fd = open(buf, OWRITE|OCEXEC);
	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);
}