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authorHelge Deller <deller@gmx.de>2016-04-08 18:18:48 +0200
committerHelge Deller <deller@gmx.de>2016-04-08 22:14:04 +0200
commitef72f3110d8b19f4c098a0bff7ed7d11945e70c6 (patch)
tree42b3f7f407b9d875baaf36045f59fc0965d675ee
parente3893027a300927049efc1572f852201eb785142 (diff)
downloadlinux-sh-ef72f3110d8b19f4c098a0bff7ed7d11945e70c6.tar.gz
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>
-rw-r--r--arch/parisc/kernel/traps.c3
1 files changed, 3 insertions, 0 deletions
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);
}