bpf: move tmp variable into ax register in interpreter

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This change moves the on-stack 64 bit tmp variable in ___bpf_prog_run()
into the hidden ax register. The latter is currently only used in JITs
for constant blinding as a temporary scratch register, meaning the BPF
interpreter will never see the use of ax. Therefore it is safe to use
it for the cases where tmp has been used earlier. This is needed to later
on allow restricted hidden use of ax in both interpreter and JITs.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Daniel Borkmann 2019-01-03 00:58:28 +01:00 • committed by Alexei Starovoitov

parent c08435ec7f

commit 144cd91c4c

2 changed files with 19 additions and 18 deletions

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3

include/linux/filter.h

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34

kernel/bpf/core.c

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