[PATCH] net: filter: make JITs zero A for SKF_AD_ALU_XOR_X

On 01/05/2016 05:03 PM, Rabin Vincent wrote:

On Tue, Jan 05, 2016 at 08:00:45AM -0800, Eric Dumazet wrote:

quoted

On Tue, 2016-01-05 at 16:23 +0100, Rabin Vincent wrote:

quoted

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.

Is x86_64 part of this 'All' subset ? ;)

No, because it's an eBPF JIT.

Correct, filter conversion to eBPF clears it already.