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nfp: bpf: reject program on instructions unknown to the JIT compiler 

If an eBPF instruction is unknown to the driver JIT compiler, we can
reject the program at verification time.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Quentin Monnet 2018-01-16 15:51:50 -08:00 committed by Daniel Borkmann
parent 7dfa4d87cf
commit 74801e50d5
3 changed files with 12 additions and 0 deletions
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5
drivers/net/ethernet/netronome/nfp/bpf/jit.c
View File

@ -2907,6 +2907,11 @@ void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt)
}
}
bool nfp_bpf_supported_opcode(u8 code)
{
return !!instr_cb[code];
}
void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv)
{
unsigned int i;

1
drivers/net/ethernet/netronome/nfp/bpf/main.h
View File

@ -324,6 +324,7 @@ struct nfp_bpf_vnic {
void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt);
int nfp_bpf_jit(struct nfp_prog *prog);
bool nfp_bpf_supported_opcode(u8 code);
extern const struct bpf_prog_offload_ops nfp_bpf_analyzer_ops;

6
drivers/net/ethernet/netronome/nfp/bpf/verifier.c
View File

@ -290,6 +290,12 @@ nfp_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn_idx)
meta = nfp_bpf_goto_meta(nfp_prog, meta, insn_idx, env->prog->len);
nfp_prog->verifier_meta = meta;
if (!nfp_bpf_supported_opcode(meta->insn.code)) {
pr_vlog(env, "instruction %#02x not supported\n",
meta->insn.code);
return -EINVAL;
}
if (meta->insn.src_reg >= MAX_BPF_REG ||
meta->insn.dst_reg >= MAX_BPF_REG) {
pr_vlog(env, "program uses extended registers - jit hardening?\n");