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Rabin Vincent 03a115644c net: filter: make JITs zero A for SKF_AD_ALU_XOR_X 
[ Upstream commit 55795ef546 ]

The SKF_AD_ALU_XOR_X ancillary is not like the other ancillary data
instructions since it XORs A with X while all the others replace A with
some loaded value.  All the BPF JITs fail to clear A if this is used as
the first instruction in a filter.  This was found using american fuzzy
lop.

Add a helper to determine if A needs to be cleared given the first
instruction in a filter, and use this in the JITs.  Except for ARM, the
rest have only been compile-tested.

Fixes: 3480593131 ("net: filter: get rid of BPF_S_* enum")
Signed-off-by: Rabin Vincent <rabin@rab.in>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
History 2016-02-15 15:42:43 -05:00
..
bpf_jit.c net: filter: make JITs zero A for SKF_AD_ALU_XOR_X 2016-02-15 15:42:43 -05:00
bpf_jit.h MIPS: net: Add BPF JIT 2014-05-30 16:10:20 +02:00
Makefile MIPS: net: Add BPF JIT 2014-05-30 16:10:20 +02:00