[src/trunk]: src/sys/arch/sparc/sparc Reject setting unaligned Program Counter

[kamil <kamil%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0818055ce1ee
branches:  trunk
changeset: 932584:0818055ce1ee
user:      kamil <kamil%NetBSD.org@localhost>
date:      Mon May 11 18:38:26 2020 +0000

description:
Reject setting unaligned Program Counter

Patch taken from OpenBSD.

Tested in qemu.

Fixes PR port-sparc/54734 by Andreas Gustafsson

diffstat:

 sys/arch/sparc/sparc/process_machdep.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (38 lines):

diff -r fed9fde80770 -r 0818055ce1ee sys/arch/sparc/sparc/process_machdep.c
--- a/sys/arch/sparc/sparc/process_machdep.c    Mon May 11 18:29:59 2020 +0000
+++ b/sys/arch/sparc/sparc/process_machdep.c    Mon May 11 18:38:26 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: process_machdep.c,v 1.19 2016/12/30 17:54:43 christos Exp $ */
+/*     $NetBSD: process_machdep.c,v 1.20 2020/05/11 18:38:26 kamil Exp $ */
 
 /*
  * Copyright (c) 1993 The Regents of the University of California.
@@ -95,7 +95,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.19 2016/12/30 17:54:43 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.20 2020/05/11 18:38:26 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -122,6 +122,9 @@
 {
        int     psr = l->l_md.md_tf->tf_psr & ~PSR_ICC;
 
+       if (((regs->r_pc | regs->r_npc) & 0x03) != 0)
+               return EINVAL;
+
        memcpy(l->l_md.md_tf, regs, sizeof(*regs));
        l->l_md.md_tf->tf_psr = psr | (regs->r_psr & PSR_ICC);
        return 0;
@@ -140,6 +143,9 @@
 process_set_pc(struct lwp *l, void *addr)
 {
 
+       if (((u_int)addr & 0x03) != 0)
+               return EINVAL;
+
        l->l_md.md_tf->tf_pc = (u_int)addr;
        l->l_md.md_tf->tf_npc = (u_int)addr + 4;
        return 0;