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| author |   mortimer <mortimer@openbsd.org> | 2018-02-10 02:54:33 +0000 |
|---|---|---|
| committer | mortimer <mortimer@openbsd.org> | 2018-02-10 02:54:33 +0000 |
| commit | a4349a2ed0d3eaa37016558674c5ee8cae05a8a6 (patch) | |
| tree | 3d82cca4e02f9a1eec97ce9b842b4b5f78f6b98f | |
| parent | Add prefix-sets, lists of prefixes which can be used in place of a (diff) | |
| download | wireguard-openbsd-a4349a2ed0d3eaa37016558674c5ee8cae05a8a6.tar.xz wireguard-openbsd-a4349a2ed0d3eaa37016558674c5ee8cae05a8a6.zip | |
Use sched_pause(yield) to decide when to yield when filling randomdata.
ok deraadt@
| -rw-r--r-- | sys/kern/exec_subr.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/sys/kern/exec_subr.c b/sys/kern/exec_subr.c index a502b4b773c..c1924edbaab 100644 --- 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); |