MIPS: BPF: Prevent kernel fall over for >=32bit shifts

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Remove BUG_ON() if the shift immediate is >=32 to avoid kernel crashes
due to malicious user input. If the shift immediate is >= 32,
we simply load the destination register with 0 since only
32-bit instructions are used by JIT so this will do the
correct thing even on MIPS64.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Daniel Borkmann <dborkman@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: netdev@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7179/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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Markos Chandras 2014-06-25 09:37:21 +01:00 • committed by Ralf Baechle

parent e5bb48b055

commit 95782bf434

1 changed files with 12 additions and 4 deletions

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arch/mips/net/bpf_jit.c

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