diff options
| author | Daniel Borkmann <[email protected]> | 2015-07-13 20:49:32 +0200 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2015-07-13 13:11:41 -0700 |
| commit | c4675f935399cbdd3ba3869b0bf6c60528c8111a (patch) | |
| tree | f4ccb3f0c039382f2a3ce0a9247197a0712aeb03 /lib/memory-notifier-error-inject.c | |
| parent | de551f2eb22a77a498cea9686f39e79f25329109 (diff) | |
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 <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'lib/memory-notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions