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ARM: save and reset the address limit when entering an exception

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When we enter an exception, the current address limit should not apply
to the exception context: if the exception context wishes to access
kernel space via the user accessors (eg, perf code), it must explicitly
request such access.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King
2016-05-13 11:40:20 +01:00
parent dd665be0e2
commit e6978e4bf1
5 changed files with 20 additions and 6 deletions
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4
arch/arm/kernel/entry-header.S
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@@ -215,7 +215,9 @@
blne trace_hardirqs_off
#endif
.endif
ldr r1, [sp, #SVC_ADDR_LIMIT]
uaccess_restore
str r1, [tsk, #TI_ADDR_LIMIT]
#ifndef CONFIG_THUMB2_KERNEL
@ ARM mode SVC restore
@@ -259,7 +261,9 @@
@ on the stack remains correct).
@
.macro svc_exit_via_fiq
ldr r1, [sp, #SVC_ADDR_LIMIT]
uaccess_restore
str r1, [tsk, #TI_ADDR_LIMIT]
#ifndef CONFIG_THUMB2_KERNEL
@ ARM mode restore
mov r0, sp