diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2016-05-13 11:40:20 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2016-07-07 16:01:01 +0100 |
| commit | e6978e4bf181fb3b5f8cb6f71b4fe30fbf1b655c (patch) | |
| tree | dddb20dbc9a5e594e406e71ed598039b33e0a4be /arch/arm/kernel/entry-header.S | |
| parent | dd665be0e243873343a28e18f9f345927b658daf (diff) | |
ARM: save and reset the address limit when entering an exception
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>
Diffstat (limited to 'arch/arm/kernel/entry-header.S')
| -rw-r--r-- | arch/arm/kernel/entry-header.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S index 5e1d029147cb..6391728c8f03 100644 --- a/arch/arm/kernel/entry-header.S +++ b/arch/arm/kernel/entry-header.S @@ -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 |