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| 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-armv.S | |
| parent | dd665be0e243873343a28e18f9f345927b658daf (diff) | |
| download | linux-e6978e4bf181fb3b5f8cb6f71b4fe30fbf1b655c.tar.bz2 | |
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-armv.S')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 0d6f5413be18..bc5f50799d75 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -185,6 +185,12 @@ 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 @@ -213,7 +219,6 @@ __irq_svc: irq_handler #ifdef CONFIG_PREEMPT - get_thread_info tsk ldr r8, [tsk, #TI_PREEMPT] @ get preempt count ldr r0, [tsk, #TI_FLAGS] @ get flags teq r8, #0 @ if preempt count != 0 |