Reference in a new issue

Blame

Copy permalink

Reference in a new issue

Copy permalink

Alexei Starovoitov 0246e64d9a 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>

2014-09-26 15:05:15 -04:00

480 lines

12 KiB

Raw Blame History