diff options
author | Helge Deller <deller@gmx.de> | 2016-04-08 18:18:48 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-20 15:45:05 +0900 |
commit | 1abe5c5fa89d2730a6f4d4b1aaa3f847e5adeaa7 (patch) | |
tree | 5b1c314bf9644e690725a6da94132b860eb58734 /arch | |
parent | 2279582391ad6202b596f67f3e4beafed8546cea (diff) |
parisc: Fix kernel crash with reversed copy_from_user()
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>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/parisc/kernel/traps.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index 553b09855cfd..77e2262c97f6 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); } |