From: Helge Deller Date: Fri, 8 Apr 2016 16:18:48 +0000 (+0200) Subject: parisc: Fix kernel crash with reversed copy_from_user() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ef72f3110d8b19f4c098a0bff7ed7d11945e70c6;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git parisc: Fix kernel crash with reversed copy_from_user() 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 --- diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index 16e0735e2f46..97d6b208e129 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -795,6 +795,9 @@ void notrace handle_interruption(int code, struct pt_regs *regs) if (fault_space == 0 && !faulthandler_disabled()) { + /* 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); }