Commit ef72f311 authored by Helge Deller's avatar Helge Deller
Browse files

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: default avatarHelge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>
parent e3893027
...@@ -795,6 +795,9 @@ void notrace handle_interruption(int code, struct pt_regs *regs) ...@@ -795,6 +795,9 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
if (fault_space == 0 && !faulthandler_disabled()) 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); pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
parisc_terminate("Kernel Fault", regs, code, fault_address); parisc_terminate("Kernel Fault", regs, code, fault_address);
} }
......
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