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| author | Helge Deller <deller@gmx.de> | 2016-04-08 18:18:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-20 15:40:39 +0900 |
| commit | 7b5b3bf5638221359c03d71589b8784e1735b4db (patch) | |
| tree | a9cb87dbc8c51ccd88ea2fe1273187a08fad40ce | |
| parent | e2e26bf7be49e583aab8046807230c00f42390fb (diff) | |
| download | lwn-7b5b3bf5638221359c03d71589b8784e1735b4db.tar.gz lwn-7b5b3bf5638221359c03d71589b8784e1735b4db.zip | |
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>
| -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 47ee620d15d2..05aab1333dfa 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -802,6 +802,9 @@ void notrace handle_interruption(int code, struct pt_regs *regs) if (fault_space == 0 && !in_atomic()) { + /* 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); } |