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parisc: Fix kernel crash with reversed copy_from_user()

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commit ef72f3110d8b19f4c098a0bff7ed7d11945e70c6 upstream.

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: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller 2016-04-08 18:18:48 +02:00 committed by Greg Kroah-Hartman
parent 7cdf5d71b4
commit ec353a589d
1 changed files with 3 additions and 0 deletions
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3
arch/parisc/kernel/traps.c
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@ -798,6 +798,9 @@ 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);
}