ARM: uaccess: consolidate uaccess asm to asm/uaccess-asm.h
[ Upstream commit 747ffc2fcf ]
Consolidate the user access assembly code to asm/uaccess-asm.h. This
moves the csdb, check_uaccess, uaccess_mask_range_ptr, uaccess_enable,
uaccess_disable, uaccess_save, uaccess_restore macros, and creates two
new ones for exception entry and exit - uaccess_entry and uaccess_exit.
This makes the uaccess_save and uaccess_restore macros private to
asm/uaccess-asm.h.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Russell King
Greg Kroah-Hartman
parent
f175897a96
commit
96e2df4c75
@ -18,11 +18,11 @@
|
||||
#endif
|
||||
|
||||
#include <asm/ptrace.h>
|
||||
#include <asm/domain.h>
|
||||
#include <asm/opcodes-virt.h>
|
||||
#include <asm/asm-offsets.h>
|
||||
#include <asm/page.h>
|
||||
#include <asm/thread_info.h>
|
||||
#include <asm/uaccess-asm.h>
|
||||
|
||||
#define IOMEM(x) (x)
|
||||
|
||||
@ -446,79 +446,6 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
|
||||
.size \name , . - \name
|
||||
.endm
|
||||
|
||||
.macro csdb
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
.inst.w 0xf3af8014
|
||||
#else
|
||||
.inst 0xe320f014
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
|
||||
#ifndef CONFIG_CPU_USE_DOMAINS
|
||||
adds \tmp, \addr, #\size - 1
|
||||
sbcscc \tmp, \tmp, \limit
|
||||
bcs \bad
|
||||
#ifdef CONFIG_CPU_SPECTRE
|
||||
movcs \addr, #0
|
||||
csdb
|
||||
#endif
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
|
||||
#ifdef CONFIG_CPU_SPECTRE
|
||||
sub \tmp, \limit, #1
|
||||
subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
|
||||
addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
|
||||
subshs \tmp, \tmp, \size @ tmp = limit - (addr + size) }
|
||||
movlo \addr, #0 @ if (tmp < 0) addr = NULL
|
||||
csdb
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_disable, tmp, isb=1
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
/*
|
||||
* Whenever we re-enter userspace, the domains should always be
|
||||
* set appropriately.
|
||||
*/
|
||||
mov \tmp, #DACR_UACCESS_DISABLE
|
||||
mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
|
||||
.if \isb
|
||||
instr_sync
|
||||
.endif
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_enable, tmp, isb=1
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
/*
|
||||
* Whenever we re-enter userspace, the domains should always be
|
||||
* set appropriately.
|
||||
*/
|
||||
mov \tmp, #DACR_UACCESS_ENABLE
|
||||
mcr p15, 0, \tmp, c3, c0, 0
|
||||
.if \isb
|
||||
instr_sync
|
||||
.endif
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_save, tmp
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
mrc p15, 0, \tmp, c3, c0, 0
|
||||
str \tmp, [sp, #SVC_DACR]
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_restore
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
ldr r0, [sp, #SVC_DACR]
|
||||
mcr p15, 0, r0, c3, c0, 0
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
|
||||
.macro ret\c, reg
|
||||
#if __LINUX_ARM_ARCH__ < 6
|
||||
|
||||
106
arch/arm/include/asm/uaccess-asm.h
Normal file
106
arch/arm/include/asm/uaccess-asm.h
Normal file
@ -0,0 +1,106 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0-only */
|
||||
|
||||
#ifndef __ASM_UACCESS_ASM_H__
|
||||
#define __ASM_UACCESS_ASM_H__
|
||||
|
||||
#include <asm/asm-offsets.h>
|
||||
#include <asm/domain.h>
|
||||
#include <asm/memory.h>
|
||||
#include <asm/thread_info.h>
|
||||
|
||||
.macro csdb
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
.inst.w 0xf3af8014
|
||||
#else
|
||||
.inst 0xe320f014
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
|
||||
#ifndef CONFIG_CPU_USE_DOMAINS
|
||||
adds \tmp, \addr, #\size - 1
|
||||
sbcscc \tmp, \tmp, \limit
|
||||
bcs \bad
|
||||
#ifdef CONFIG_CPU_SPECTRE
|
||||
movcs \addr, #0
|
||||
csdb
|
||||
#endif
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
|
||||
#ifdef CONFIG_CPU_SPECTRE
|
||||
sub \tmp, \limit, #1
|
||||
subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
|
||||
addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
|
||||
subshs \tmp, \tmp, \size @ tmp = limit - (addr + size) }
|
||||
movlo \addr, #0 @ if (tmp < 0) addr = NULL
|
||||
csdb
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_disable, tmp, isb=1
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
/*
|
||||
* Whenever we re-enter userspace, the domains should always be
|
||||
* set appropriately.
|
||||
*/
|
||||
mov \tmp, #DACR_UACCESS_DISABLE
|
||||
mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
|
||||
.if \isb
|
||||
instr_sync
|
||||
.endif
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_enable, tmp, isb=1
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
/*
|
||||
* Whenever we re-enter userspace, the domains should always be
|
||||
* set appropriately.
|
||||
*/
|
||||
mov \tmp, #DACR_UACCESS_ENABLE
|
||||
mcr p15, 0, \tmp, c3, c0, 0
|
||||
.if \isb
|
||||
instr_sync
|
||||
.endif
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_save, tmp
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
mrc p15, 0, \tmp, c3, c0, 0
|
||||
str \tmp, [sp, #SVC_DACR]
|
||||
#endif
|
||||
.endm
|
||||
|
||||
.macro uaccess_restore
|
||||
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
||||
ldr r0, [sp, #SVC_DACR]
|
||||
mcr p15, 0, r0, c3, c0, 0
|
||||
#endif
|
||||
.endm
|
||||
|
||||
/*
|
||||
* Save the address limit on entry to a privileged exception and
|
||||
* if using PAN, save and disable usermode access.
|
||||
*/
|
||||
.macro uaccess_entry, tsk, tmp0, tmp1, tmp2, disable
|
||||
ldr \tmp0, [\tsk, #TI_ADDR_LIMIT]
|
||||
mov \tmp1, #TASK_SIZE
|
||||
str \tmp1, [\tsk, #TI_ADDR_LIMIT]
|
||||
str \tmp0, [sp, #SVC_ADDR_LIMIT]
|
||||
uaccess_save \tmp0
|
||||
.if \disable
|
||||
uaccess_disable \tmp0
|
||||
.endif
|
||||
.endm
|
||||
|
||||
/* Restore the user access state previously saved by uaccess_entry */
|
||||
.macro uaccess_exit, tsk, tmp0, tmp1
|
||||
ldr \tmp1, [sp, #SVC_ADDR_LIMIT]
|
||||
uaccess_restore
|
||||
str \tmp1, [\tsk, #TI_ADDR_LIMIT]
|
||||
.endm
|
||||
|
||||
#endif /* __ASM_UACCESS_ASM_H__ */
|
||||
@ -27,6 +27,7 @@
|
||||
#include <asm/unistd.h>
|
||||
#include <asm/tls.h>
|
||||
#include <asm/system_info.h>
|
||||
#include <asm/uaccess-asm.h>
|
||||
|
||||
#include "entry-header.S"
|
||||
#include <asm/entry-macro-multi.S>
|
||||
@ -179,15 +180,7 @@ ENDPROC(__und_invalid)
|
||||
stmia r7, {r2 - r6}
|
||||
|
||||
get_thread_info tsk
|
||||
ldr r0, [tsk, #TI_ADDR_LIMIT]
|
||||
mov r1, #TASK_SIZE
|
||||
str r1, [tsk, #TI_ADDR_LIMIT]
|
||||
str r0, [sp, #SVC_ADDR_LIMIT]
|
||||
|
||||
uaccess_save r0
|
||||
.if \uaccess
|
||||
uaccess_disable r0
|
||||
.endif
|
||||
uaccess_entry tsk, r0, r1, r2, \uaccess
|
||||
|
||||
.if \trace
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
|
||||
@ -6,6 +6,7 @@
|
||||
#include <asm/asm-offsets.h>
|
||||
#include <asm/errno.h>
|
||||
#include <asm/thread_info.h>
|
||||
#include <asm/uaccess-asm.h>
|
||||
#include <asm/v7m.h>
|
||||
|
||||
@ Bad Abort numbers
|
||||
@ -217,9 +218,7 @@
|
||||
blne trace_hardirqs_off
|
||||
#endif
|
||||
.endif
|
||||
ldr r1, [sp, #SVC_ADDR_LIMIT]
|
||||
uaccess_restore
|
||||
str r1, [tsk, #TI_ADDR_LIMIT]
|
||||
uaccess_exit tsk, r0, r1
|
||||
|
||||
#ifndef CONFIG_THUMB2_KERNEL
|
||||
@ ARM mode SVC restore
|
||||
@ -263,9 +262,7 @@
|
||||
@ on the stack remains correct).
|
||||
@
|
||||
.macro svc_exit_via_fiq
|
||||
ldr r1, [sp, #SVC_ADDR_LIMIT]
|
||||
uaccess_restore
|
||||
str r1, [tsk, #TI_ADDR_LIMIT]
|
||||
uaccess_exit tsk, r0, r1
|
||||
#ifndef CONFIG_THUMB2_KERNEL
|
||||
@ ARM mode restore
|
||||
mov r0, sp
|
||||
|
||||
Loading…
Reference in New Issue
Block a user