Use sched_pause(yield) to decide when to yield when filling randomdata.

ok deraadt@

diff --git a/sys/kern/exec_subr.c b/sys/kern/exec_subr.c
index a502b4b..c1924ed 100644 (file)
--- a/sys/kern/exec_subr.c
+++ b/sys/kern/exec_subr.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: exec_subr.c,v 1.53 2018/02/08 09:27:44 mortimer Exp $ */
+/*     $OpenBSD: exec_subr.c,v 1.54 2018/02/10 02:54:33 mortimer Exp $ */
 /*     $NetBSD: exec_subr.c,v 1.9 1994/12/04 03:10:42 mycroft Exp $    */
 
 /*
@@ -290,7 +290,7 @@ vmcmd_randomize(struct proc *p, struct exec_vmcmd *cmd)
        int error;
        struct arc4random_ctx *ctx;
        char *buf;
-       size_t count, sublen, off = 0;
+       size_t sublen, off = 0;
        size_t len = cmd->ev_len;
 
        if (len == 0)
@@ -305,7 +305,6 @@ vmcmd_randomize(struct proc *p, struct exec_vmcmd *cmd)
                explicit_bzero(buf, len);
        } else {
                ctx = arc4random_ctx_new();
-               count = 0;
                do {
                        sublen = MIN(len, PAGE_SIZE);
                        arc4random_ctx_buf(ctx, buf, sublen);
@@ -314,10 +313,7 @@ vmcmd_randomize(struct proc *p, struct exec_vmcmd *cmd)
                                break;
                        off += sublen;
                        len -= sublen;
-                       if (++count == 32) {
-                               count = 0;
-                               yield();
-                       }
+                       sched_pause(yield);
                } while (len);
                arc4random_ctx_free(ctx);
                explicit_bzero(buf, PAGE_SIZE);