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author | Rabin Vincent <rabin@rab.in> | 2016-01-05 18:23:07 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-31 22:25:50 +0300 |
commit | a72a87340100097d6d4ad8015014caf7f05442f9 (patch) | |
tree | c5095874d56aeb470cc7960d03451dbf73bb8136 /net | |
parent | 0e6f38960cfdc8597056529de7def7a035f905fb (diff) | |
download | linux-a72a87340100097d6d4ad8015014caf7f05442f9.tar.xz |
net: filter: make JITs zero A for SKF_AD_ALU_XOR_X
[ Upstream commit 55795ef5469290f89f04e12e662ded604909e462 ]
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: 3480593131e0 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions