linux-sg2042/arch/mips/net
Rabin Vincent 55795ef546 net: filter: make JITs zero A for SKF_AD_ALU_XOR_X
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>
2016-01-06 00:43:52 -05:00
..
Makefile MIPS: BPF: Introduce BPF ASM helpers 2015-06-21 21:54:25 +02:00
bpf_jit.c net: filter: make JITs zero A for SKF_AD_ALU_XOR_X 2016-01-06 00:43:52 -05:00
bpf_jit.h MIPS: BPF: Introduce BPF ASM helpers 2015-06-21 21:54:25 +02:00
bpf_jit_asm.S MIPS: BPF: Fix load delay slots. 2015-10-02 09:48:57 +02:00