From: Alexei Starovoitov <ast@plumgrid.com>
Date: Fri, 26 Sep 2014 07:17:04 +0000 (-0700)
Subject: bpf: handle pseudo BPF_LD_IMM64 insn
X-Git-Tag: fixes-against-v3.18-rc2~81^2~1^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0246e64d9a5fcd4805198de59b9b5cf1f974eb41;p=pandora-kernel.git

bpf: handle pseudo BPF_LD_IMM64 insn

eBPF programs passed from userspace are using pseudo BPF_LD_IMM64 instructions
to refer to process-local map_fd. Scan the program for such instructions and
if FDs are valid, convert them to 'struct bpf_map' pointers which will be used
by verifier to check access to maps in bpf_map_lookup/update() calls.
If program passes verifier, convert pseudo BPF_LD_IMM64 into generic by dropping
BPF_PSEUDO_MAP_FD flag.

Note that eBPF interpreter is generic and knows nothing about pseudo insns.

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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