Daniel Borkmann c4675f9353 ebpf: remove self-assignment in interpreter's tail call ... ARG1 = BPF_R1 as it stands, evaluates to regs[BPF_REG_1] = regs[BPF_REG_1] and thus has no effect. Add a comment instead, explaining what happens and why it's okay to just remove it. Since from user space side, a tail call is invoked as a pseudo helper function via bpf_tail_call_proto, the verifier checks the arguments just like with any other helper function and makes sure that the first argument (regs[BPF_REG_1])'s type is ARG_PTR_TO_CTX. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2015-07-13 13:11:41 -07:00
..
Makefile	ebpf: remove kernel test stubs	2015-03-01 14:05:18 -05:00
arraymap.c	bpf: add missing rcu protection when releasing programs from prog_array	2015-05-31 00:27:51 -07:00
core.c	ebpf: remove self-assignment in interpreter's tail call	2015-07-13 13:11:41 -07:00
hashtab.c	ebpf: constify various function pointer structs	2015-03-01 14:05:18 -05:00
helpers.c	bpf: introduce current->pid, tgid, uid, gid, comm accessors	2015-06-15 15:53:50 -07:00
syscall.c	bpf: add missing rcu protection when releasing programs from prog_array	2015-05-31 00:27:51 -07:00
verifier.c	bpf: allow programs to write to certain skb fields	2015-06-07 02:01:33 -07:00