[src/trunk]: src/sys/arch/amd64/amd64 Make sure we don't go farther with 32bi...

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

details:   https://anonhg.NetBSD.org/src/rev/dd2301b00e38
branches:  trunk
changeset: 356888:dd2301b00e38
user:      maxv <maxv%NetBSD.org@localhost>
date:      Thu Oct 19 09:32:01 2017 +0000

description:
Make sure we don't go farther with 32bit LWPs. There appears to be some
confusion in the code - in part introduced by myself -, and clearly this
place is not supposed to handle 32bit LWPs.

Right now we're returning EINVAL, but verily we would need to redirect
these calls to their netbsd32 counterparts.

diffstat:

 sys/arch/amd64/amd64/process_machdep.c |  39 ++++++++++++++++++++++++++++++++-
 1 files changed, 37 insertions(+), 2 deletions(-)

diffs (108 lines):

diff -r e871c0d7e12f -r dd2301b00e38 sys/arch/amd64/amd64/process_machdep.c
--- a/sys/arch/amd64/amd64/process_machdep.c    Thu Oct 19 07:02:00 2017 +0000
+++ b/sys/arch/amd64/amd64/process_machdep.c    Thu Oct 19 09:32:01 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: process_machdep.c,v 1.35 2017/08/13 08:07:52 maxv Exp $        */
+/*     $NetBSD: process_machdep.c,v 1.36 2017/10/19 09:32:01 maxv Exp $        */
 
 /*
  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@@ -74,7 +74,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.35 2017/08/13 08:07:52 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.36 2017/10/19 09:32:01 maxv Exp $");
 
 #include "opt_xen.h"
 #include <sys/param.h>
@@ -103,6 +103,11 @@
 process_read_regs(struct lwp *l, struct reg *regs)
 {
        struct trapframe *tf = process_frame(l);
+       struct proc *p = l->l_proc;
+
+       if (p->p_flag & PK_32) {
+               return EINVAL;
+       }
 
 #define copy_to_reg(reg, REG, idx) regs->regs[_REG_##REG] = tf->tf_##reg;
        _FRAME_GREG(copy_to_reg)
@@ -114,6 +119,11 @@
 int
 process_read_fpregs(struct lwp *l, struct fpreg *regs, size_t *sz)
 {
+       struct proc *p = l->l_proc;
+
+       if (p->p_flag & PK_32) {
+               return EINVAL;
+       }
 
        process_read_fpregs_xmm(l, &regs->fxstate);
 
@@ -123,6 +133,11 @@
 int
 process_read_dbregs(struct lwp *l, struct dbreg *regs, size_t *sz)
 {
+       struct proc *p = l->l_proc;
+
+       if (p->p_flag & PK_32) {
+               return EINVAL;
+       }
 
        x86_dbregs_read(l, regs);
 
@@ -133,10 +148,15 @@
 process_write_regs(struct lwp *l, const struct reg *regp)
 {
        struct trapframe *tf = process_frame(l);
+       struct proc *p = l->l_proc;
        int error;
        const long *regs = regp->regs;
        int err, trapno;
 
+       if (p->p_flag & PK_32) {
+               return EINVAL;
+       }
+
        /*
         * Check for security violations.
         * Note that struct regs is compatible with
@@ -168,6 +188,11 @@
 int
 process_write_fpregs(struct lwp *l, const struct fpreg *regs, size_t sz)
 {
+       struct proc *p = l->l_proc;
+
+       if (p->p_flag & PK_32) {
+               return EINVAL;
+       }
 
        process_write_fpregs_xmm(l, &regs->fxstate);
        return 0;
@@ -176,8 +201,13 @@
 int
 process_write_dbregs(struct lwp *l, const struct dbreg *regs, size_t sz)
 {
+       struct proc *p = l->l_proc;
        int error;
 
+       if (p->p_flag & PK_32) {
+               return EINVAL;
+       }
+
        /*
         * Check for security violations.
         */
@@ -207,6 +237,11 @@
 process_set_pc(struct lwp *l, void *addr)
 {
        struct trapframe *tf = process_frame(l);
+       struct proc *p = l->l_proc;
+
+       if (p->p_flag & PK_32) {
+               return EINVAL;
+       }
 
        if ((uint64_t)addr >= VM_MAXUSER_ADDRESS)
                return EINVAL;