diff options
| -rw-r--r-- | kernel/bpf/syscall.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 7af0dcc5d755..821f9e807de5 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -617,6 +617,14 @@ static void fixup_bpf_calls(struct bpf_prog *prog) if (insn->imm == BPF_FUNC_xdp_adjust_head) prog->xdp_adjust_head = 1; if (insn->imm == BPF_FUNC_tail_call) { + /* If we tail call into other programs, we + * cannot make any assumptions since they + * can be replaced dynamically during runtime + * in the program array. + */ + prog->cb_access = 1; + prog->xdp_adjust_head = 1; + /* mark bpf_tail_call as different opcode * to avoid conditional branch in * interpeter for every normal call |