parisc: Fix kernel crash with reversed copy_from_user()

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commit ef72f3110d 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>

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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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arch/parisc/kernel/traps.c

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