linux

Rabin Vincent fd610413a7 net: filter: make JITs zero A for SKF_AD_ALU_XOR_X commit `55795ef546` upstream. 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> [ luis: backported to 3.16: adjusted context ] Signed-off-by: Luis Henriques <luis.henriques@canonical.com>		History 2016-01-25 10:44:05 +00:00
..
bpf_jit_32.c	net: filter: make JITs zero A for SKF_AD_ALU_XOR_X	2016-01-25 10:44:05 +00:00
bpf_jit_32.h	ARM: net: bpf_jit_32: add XOR instruction for BPF JIT	2012-11-13 18:21:10 -05:00
Makefile	ARM: 7259/3: net: JIT compiler for packet filters	2012-03-24 09:38:56 +00:00