| From | Kamal Mostafa <> | Subject | [PATCH 4.2.y-ckt 49/70] parisc: Fix kernel crash with reversed copy_from_user() | Date | Tue, 12 Apr 2016 13:52:34 -0700 |
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4.2.8-ckt8 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Helge Deller <deller@gmx.de>
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: Kamal Mostafa <kamal@canonical.com> --- arch/parisc/kernel/traps.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index b99b39f..3419668 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -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); } -- 2.7.4
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