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libauthsrv: open internal file-descriptors with OCEXEC flag

--- a/sys/src/libauthsrv/readcons.c

+++ b/sys/src/libauthsrv/readcons.c

@@ -13,13 +13,13 @@

 	s = p = nil;

 	fdout = ctl = -1;

-	if((fdin = open("/dev/cons", OREAD)) < 0)

+	if((fdin = open("/dev/cons", OREAD|OCEXEC)) < 0)

 		goto Out;

-	if((fdout = open("/dev/cons", OWRITE)) < 0)

+	if((fdout = open("/dev/cons", OWRITE|OCEXEC)) < 0)

 		goto Out;

 	if(raw){

-		if((ctl = open("/dev/consctl", OWRITE)) < 0)

+		if((ctl = open("/dev/consctl", OWRITE|OCEXEC)) < 0)

 			goto Out;

 		write(ctl, "rawon", 5);

 	}

--- a/sys/src/libauthsrv/readnvram.c

+++ b/sys/src/libauthsrv/readnvram.c

@@ -91,9 +91,9 @@

 			v[0] = "";

 			v[1] = nil;

 		}

-		fd = open(v[0], ORDWR);

+		fd = open(v[0], ORDWR|OCEXEC);

 		if (fd < 0)

-			fd = open(v[0], OREAD);

+			fd = open(v[0], OREAD|OCEXEC);

 		safelen = sizeof(Nvrsafe);

 		if(strstr(v[0], "/9fat") == nil)

 			safeoff = 0;

@@ -120,7 +120,7 @@

 		for(i=0; i<nelem(nvtab); i++){

 			if(strcmp(cputype, nvtab[i].cputype) != 0)

 				continue;

-			if((fd = open(nvtab[i].file, ORDWR)) < 0)

+			if((fd = open(nvtab[i].file, ORDWR|OCEXEC)) < 0)

 				continue;

 			safeoff = nvtab[i].off;

 			safelen = nvtab[i].len;