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[src/trunk]: src/sys/arch Add SMAP support for i386.
details: https://anonhg.NetBSD.org/src/rev/c42dcc86ee02
branches: trunk
changeset: 829361:c42dcc86ee02
user: maxv <maxv%NetBSD.org@localhost>
date: Sat Jan 27 09:33:25 2018 +0000
description:
Add SMAP support for i386.
diffstat:
sys/arch/i386/i386/copy.S | 34 ++++++++++++++++++++++++++++++++--
sys/arch/i386/i386/trap.c | 13 +++++++++++--
sys/arch/i386/include/frameasm.h | 11 ++++++++++-
sys/arch/x86/x86/cpu.c | 6 ++----
sys/arch/x86/x86/patch.c | 6 ++----
5 files changed, 57 insertions(+), 13 deletions(-)
diffs (truncated from 354 to 300 lines):
diff -r 33aac68cddda -r c42dcc86ee02 sys/arch/i386/i386/copy.S
--- a/sys/arch/i386/i386/copy.S Sat Jan 27 08:12:27 2018 +0000
+++ b/sys/arch/i386/i386/copy.S Sat Jan 27 09:33:25 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: copy.S,v 1.26 2018/01/27 07:45:57 maxv Exp $ */
+/* $NetBSD: copy.S,v 1.27 2018/01/27 09:33:25 maxv Exp $ */
/*
* Copyright (c) 1998, 2000, 2004, 2008 The NetBSD Foundation, Inc.
@@ -64,7 +64,7 @@
*/
#include <machine/asm.h>
-__KERNEL_RCSID(0, "$NetBSD: copy.S,v 1.26 2018/01/27 07:45:57 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: copy.S,v 1.27 2018/01/27 09:33:25 maxv Exp $");
#include "assym.h"
@@ -234,6 +234,7 @@
cmpl $VM_MAXUSER_ADDRESS,%edx
ja _C_LABEL(copy_efault)
+ SMAP_DISABLE
.Lcopyout_start:
movl %eax,%ecx
shrl $2,%ecx
@@ -245,6 +246,7 @@
rep
movsb
.Lcopyout_end:
+ SMAP_ENABLE
popl %edi
popl %esi
@@ -272,6 +274,7 @@
cmpl $VM_MAXUSER_ADDRESS,%edx
ja _C_LABEL(copy_efault)
+ SMAP_DISABLE
.Lcopyin_start:
movl %eax,%ecx
shrl $2,%ecx
@@ -283,6 +286,7 @@
rep
movsb
.Lcopyin_end:
+ SMAP_ENABLE
popl %edi
popl %esi
@@ -311,6 +315,7 @@
END(kcopy_fault)
NENTRY(copy_fault)
+ SMAP_ENABLE
popl %edi
popl %esi
ret
@@ -350,6 +355,7 @@
movl %eax,20(%esp)
1: incl %edx
+ SMAP_DISABLE
.Lcopyoutstr_start:
1: decl %edx
jz 2f
@@ -358,6 +364,7 @@
testb %al,%al
jnz 1b
.Lcopyoutstr_end:
+ SMAP_ENABLE
/* Success -- 0 byte reached. */
decl %edx
@@ -365,6 +372,7 @@
jmp copystr_return
2: /* edx is zero -- return EFAULT or ENAMETOOLONG. */
+ SMAP_ENABLE
cmpl $VM_MAXUSER_ADDRESS,%edi
jae _C_LABEL(copystr_efault)
movl $ENAMETOOLONG,%eax
@@ -400,6 +408,7 @@
movl %eax,20(%esp)
1: incl %edx
+ SMAP_DISABLE
.Lcopyinstr_start:
1: decl %edx
jz 2f
@@ -408,6 +417,7 @@
testb %al,%al
jnz 1b
.Lcopyinstr_end:
+ SMAP_ENABLE
/* Success -- 0 byte reached. */
decl %edx
@@ -415,6 +425,7 @@
jmp copystr_return
2: /* edx is zero -- return EFAULT or ENAMETOOLONG. */
+ SMAP_ENABLE
cmpl $VM_MAXUSER_ADDRESS,%esi
jae _C_LABEL(copystr_efault)
movl $ENAMETOOLONG,%eax
@@ -428,6 +439,7 @@
END(copystr_efault)
NENTRY(copystr_fault)
+ SMAP_ENABLE
copystr_return:
/* Set *lencopied and return %eax. */
movl 20(%esp),%ecx
@@ -499,7 +511,9 @@
GET_CURPCB(%ecx)
movl $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
+ SMAP_DISABLE
movl (%edx),%eax
+ SMAP_ENABLE
movl $0,PCB_ONFAULT(%ecx)
ret
@@ -522,7 +536,9 @@
movl L_PCB(%ecx),%ecx
movl $_C_LABEL(fusubail),PCB_ONFAULT(%ecx)
+ SMAP_DISABLE
movzwl (%edx),%eax
+ SMAP_ENABLE
movl $0,PCB_ONFAULT(%ecx)
ret
@@ -541,7 +557,9 @@
GET_CURPCB(%ecx)
movl $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
+ SMAP_DISABLE
movzbl (%edx),%eax
+ SMAP_ENABLE
movl $0,PCB_ONFAULT(%ecx)
ret
@@ -552,6 +570,7 @@
* Handle faults from [fs]u*(). Clean up and return -1.
*/
NENTRY(fusufault)
+ SMAP_ENABLE
movl $0,PCB_ONFAULT(%ecx)
movl $-1,%eax
ret
@@ -563,6 +582,7 @@
* than trying to page fault.
*/
NENTRY(fusubail)
+ SMAP_ENABLE
movl $0,PCB_ONFAULT(%ecx)
movl $-1,%eax
ret
@@ -593,7 +613,9 @@
movl $_C_LABEL(fusubail),PCB_ONFAULT(%ecx)
movl 8(%esp),%eax
+ SMAP_DISABLE
movw %ax,(%edx)
+ SMAP_ENABLE
xorl %eax,%eax
movl %eax,PCB_ONFAULT(%ecx)
@@ -614,7 +636,9 @@
movl $_C_LABEL(fusufault),PCB_ONFAULT(%ecx)
movb 8(%esp),%al
+ SMAP_DISABLE
movb %al,(%edx)
+ SMAP_ENABLE
xorl %eax,%eax
movl %eax,PCB_ONFAULT(%ecx)
@@ -636,11 +660,13 @@
cmpl $VM_MAXUSER_ADDRESS-4,%edx
ja _C_LABEL(ucas_efault)
+ SMAP_DISABLE
.Lucas32_start:
/* Perform the CAS */
lock
cmpxchgl %ecx,(%edx)
.Lucas32_end:
+ SMAP_ENABLE
/*
* Note: %eax is "old" value.
@@ -659,6 +685,7 @@
END(ucas_efault)
NENTRY(ucas_fault)
+ SMAP_ENABLE
ret
END(ucas_fault)
@@ -693,6 +720,7 @@
cmpl $VM_MAXUSER_ADDRESS,%eax
ja _C_LABEL(x86_copyargs_efault)
+ SMAP_DISABLE
.Lx86_copyargs_start:
/* There are a maximum of 8 args + 2 for syscall indirect */
cmp $16,%ecx
@@ -722,6 +750,7 @@
movl %eax,32(%edx)
movl %ecx,36(%edx)
.Lx86_copyargs_end:
+ SMAP_ENABLE
popl %esi
xorl %eax,%eax
@@ -736,6 +765,7 @@
END(x86_copyargs_efault)
NENTRY(x86_copyargs_fault)
+ SMAP_ENABLE
popl %esi
ret
END(x86_copyargs_fault)
diff -r 33aac68cddda -r c42dcc86ee02 sys/arch/i386/i386/trap.c
--- a/sys/arch/i386/i386/trap.c Sat Jan 27 08:12:27 2018 +0000
+++ b/sys/arch/i386/i386/trap.c Sat Jan 27 09:33:25 2018 +0000
@@ -1,5 +1,5 @@
-/* $NetBSD: trap.c,v 1.291 2017/09/17 09:41:35 maxv Exp $ */
+/* $NetBSD: trap.c,v 1.292 2018/01/27 09:33:25 maxv Exp $ */
/*-
* Copyright (c) 1998, 2000, 2005, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -69,7 +69,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.291 2017/09/17 09:41:35 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.292 2018/01/27 09:33:25 maxv Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
@@ -564,6 +564,15 @@
(void *)cr2);
}
+ if ((frame->tf_err & PGEX_P) &&
+ cr2 < VM_MAXUSER_ADDRESS) {
+ /* SMAP might have brought us here */
+ if (onfault_handler(pcb, frame) == NULL) {
+ panic("prevented access to %p (SMAP)",
+ (void *)cr2);
+ }
+ }
+
goto faultcommon;
case T_PAGEFLT|T_USER: { /* page fault */
diff -r 33aac68cddda -r c42dcc86ee02 sys/arch/i386/include/frameasm.h
--- a/sys/arch/i386/include/frameasm.h Sat Jan 27 08:12:27 2018 +0000
+++ b/sys/arch/i386/include/frameasm.h Sat Jan 27 09:33:25 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: frameasm.h,v 1.23 2018/01/27 08:12:27 maxv Exp $ */
+/* $NetBSD: frameasm.h,v 1.24 2018/01/27 09:33:25 maxv Exp $ */
#ifndef _I386_FRAMEASM_H_
#define _I386_FRAMEASM_H_
@@ -40,10 +40,19 @@
.long 123b ; \
.popsection
+#define SMAP_ENABLE \
+ HOTPATCH(HP_NAME_CLAC, 3) ; \
+ .byte 0x0F, 0x1F, 0x00
+
+#define SMAP_DISABLE \
+ HOTPATCH(HP_NAME_STAC, 3) ; \
+ .byte 0x0F, 0x1F, 0x00
+
/*
* These are used on interrupt or trap entry or exit.
*/
#define INTRENTRY \
+ SMAP_ENABLE ; \
subl $TF_PUSHSIZE,%esp ; \
movw %gs,TF_GS(%esp) ; \
movw %fs,TF_FS(%esp) ; \
diff -r 33aac68cddda -r c42dcc86ee02 sys/arch/x86/x86/cpu.c
--- a/sys/arch/x86/x86/cpu.c Sat Jan 27 08:12:27 2018 +0000
+++ b/sys/arch/x86/x86/cpu.c Sat Jan 27 09:33:25 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu.c,v 1.146 2018/01/11 13:35:15 maxv Exp $ */
+/* $NetBSD: cpu.c,v 1.147 2018/01/27 09:33:25 maxv Exp $ */
/*
* Copyright (c) 2000-2012 NetBSD Foundation, Inc.
@@ -62,7 +62,7 @@
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