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arm64: idmap: Use "awx" flags for .idmap.text .pushsection directives

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Commit 439e70e27a51 upstream.

The identity map is mapped as both writeable and executable by the
SWAPPER_MM_MMUFLAGS and this is relied upon by the kpti code to manage
a synchronisation flag. Update the .pushsection flags to reflect the
actual mapping attributes.

Reported-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Will Deacon 2018-01-29 12:00:00 +00:00 committed by Greg Kroah-Hartman
parent 8703f27d7c
commit 1449a173a2
4 changed files with 7 additions and 7 deletions
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2
arch/arm64/kernel/cpu-reset.S
View File

@ -16,7 +16,7 @@
#include <asm/virt.h>
.text
.pushsection .idmap.text, "ax"
.pushsection .idmap.text, "awx"
/*
* __cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) - Helper for

2
arch/arm64/kernel/head.S
View File

@ -371,7 +371,7 @@ ENDPROC(__primary_switched)
* end early head section, begin head code that is also used for
* hotplug and needs to have the same protections as the text region
*/
.section ".idmap.text","ax"
.section ".idmap.text","awx"
ENTRY(kimage_vaddr)
.quad _text - TEXT_OFFSET

2
arch/arm64/kernel/sleep.S
View File

@ -96,7 +96,7 @@ ENTRY(__cpu_suspend_enter)
ret
ENDPROC(__cpu_suspend_enter)
.pushsection ".idmap.text", "ax"
.pushsection ".idmap.text", "awx"
ENTRY(cpu_resume)
bl el2_setup // if in EL2 drop to EL1 cleanly
bl __cpu_setup

8
arch/arm64/mm/proc.S
View File

@ -86,7 +86,7 @@ ENDPROC(cpu_do_suspend)
*
* x0: Address of context pointer
*/
.pushsection ".idmap.text", "ax"
.pushsection ".idmap.text", "awx"
ENTRY(cpu_do_resume)
ldp x2, x3, [x0]
ldp x4, x5, [x0, #16]
@ -152,7 +152,7 @@ ENTRY(cpu_do_switch_mm)
ret
ENDPROC(cpu_do_switch_mm)
.pushsection ".idmap.text", "ax"
.pushsection ".idmap.text", "awx"
.macro __idmap_cpu_set_reserved_ttbr1, tmp1, tmp2
adrp \tmp1, empty_zero_page
@ -185,7 +185,7 @@ ENDPROC(idmap_cpu_replace_ttbr1)
.popsection
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
.pushsection ".idmap.text", "ax"
.pushsection ".idmap.text", "awx"
.macro __idmap_kpti_get_pgtable_ent, type
dc cvac, cur_\()\type\()p // Ensure any existing dirty
@ -373,7 +373,7 @@ ENDPROC(idmap_kpti_install_ng_mappings)
* Initialise the processor for turning the MMU on. Return in x0 the
* value of the SCTLR_EL1 register.
*/
.pushsection ".idmap.text", "ax"
.pushsection ".idmap.text", "awx"
ENTRY(__cpu_setup)
tlbi vmalle1 // Invalidate local TLB
dsb nsh