Commit ef72f311 authored Apr 08, 2016 by Helge Deller

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 <deller@gmx.de>
Cc: stable@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>

parent e3893027

arch/parisc/kernel/traps.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}