Ilya Leoshkevich 7ee9593b75 s390/bpf: Fix optimizing out zero-extensions ...

commit db7bee6538 upstream.

Currently the JIT completely removes things like `reg32 += 0`,
however, the BPF_ALU semantics requires the target register to be
zero-extended in such cases.

Fix by optimizing out only the arithmetic operation, but not the
subsequent zero-extension.

Reported-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Fixes: 0546231057 ("s390/bpf: Add s390x eBPF JIT compiler backend")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-05-16 11:52:23 +09:00

..

bpf_jit_comp.c

s390/bpf: Fix optimizing out zero-extensions

2023-05-16 11:52:23 +09:00

bpf_jit.h

s390/bpf: fix recache skb->data/hlen for skb_vlan_push/pop

2016-05-19 09:14:27 +02:00

bpf_jit.S

s390: use expoline thunks in the BPF JIT

2018-05-25 16:12:58 +02:00

Makefile

s390/bpf,jit: BPF Just In Time compiler for s390

2012-09-26 15:44:49 +02:00