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bpf: Disable migrate when kprobe_multi attach to access bpf_prog_active #5678

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bpf: Disable migrate when kprobe_multi attach to access bpf_prog_active #5678

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4 changes: 2 additions & 2 deletions kernel/trace/bpf_trace.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2728,23 +2728,23 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link,
struct pt_regs *regs;
int err;

migrate_disable();
if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) {
bpf_prog_inc_misses_counter(link->link.prog);
err = 1;
goto out;
}

migrate_disable();
rcu_read_lock();
regs = ftrace_partial_regs(fregs, bpf_kprobe_multi_pt_regs_ptr());
old_run_ctx = bpf_set_run_ctx(&run_ctx.session_ctx.run_ctx);
err = bpf_prog_run(link->link.prog, regs);
bpf_reset_run_ctx(old_run_ctx);
rcu_read_unlock();
migrate_enable();

out:
__this_cpu_dec(bpf_prog_active);
migrate_enable();
return err;
}

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