x86: bpf_jit: fix FROM_BE16 and FROM_LE16/32 instructions

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[ Upstream commit 343f845b37 ]

FROM_BE16:
'ror %reg, 8' doesn't clear upper bits of the register,
so use additional 'movzwl' insn to zero extend 16 bits into 64

FROM_LE16:
should zero extend lower 16 bits into 64 bit

FROM_LE32:
should zero extend lower 32 bits into 64 bit

Fixes: 89aa075832 ("net: sock: allow eBPF programs to be attached to sockets")
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

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Alexei Starovoitov 2015-05-11 23:25:16 -07:00 • committed by Sasha Levin

parent 5d2ed1cd21

commit 8cf633a242

1 changed files with 28 additions and 0 deletions

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arch/x86/net/bpf_jit_comp.c

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