From 9ccccafe228ec2a71a6df4268ce95c27e3d3c8cf Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Fri, 8 Apr 2016 18:18:48 +0200 Subject: parisc: Fix kernel crash with reversed copy_from_user() [ Upstream commit ef72f3110d8b19f4c098a0bff7ed7d11945e70c6 ] The kernel module testcase (lib/test_user_copy.c) exhibited a kernel crash on parisc if the parameters for copy_from_user were reversed ("illegal reversed copy_to_user" testcase). Fix this potential crash by checking the fault handler if the faulting address is in the exception table. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org Cc: Kees Cook Signed-off-by: Sasha Levin --- arch/parisc/kernel/traps.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index 7f67c4c96a7a..bbf22658d1a3 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -798,6 +798,9 @@ void notrace handle_interruption(int code, struct pt_regs *regs) if (fault_space == 0 && !in_atomic()) { + /* Clean up and return if in exception table. */ + if (fixup_exception(regs)) + return; pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC); parisc_terminate("Kernel Fault", regs, code, fault_address); } -- cgit v1.2.3