Commit 36e24c00 authored Jun 11, 2017 by Daniel Borkmann Committed by David S. Miller Jun 10, 2017

bpf: reset id on spilled regs in clear_all_pkt_pointers



Right now, we don't reset the id of spilled registers in case of
clear_all_pkt_pointers(). Given pkt_pointers are highly likely to
contain an id, do so by reusing __mark_reg_unknown_value().

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

parent 4a2ff55a

kernel/bpf/verifier.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -1346,8 +1346,8 @@ static void clear_all_pkt_pointers(struct bpf_verifier_env *env)
		if (reg->type != PTR_TO_PACKET &&
		reg->type != PTR_TO_PACKET_END)
		continue;
		reg->type = UNKNOWN_VALUE;
		reg->imm = 0;
		__mark_reg_unknown_value(state->spilled_regs,
		i / BPF_REG_SIZE);
		}
		}