bpf: Fix trampoline usage in preempt

Though the second half of trampoline page is unused a task could be
preempted in the middle of the first half of trampoline and two
updates to trampoline would change the code from underneath the
preempted task. Hence wait for tasks to voluntarily schedule or go
to userspace. Add similar wait before freeing the trampoline.

Fixes: fec56f5890d9 ("bpf: Introduce BPF trampoline")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/bpf/20200121032231.3292185-1-ast@kernel.org

diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
index 79a0441..7657ede 100644 (file)
--- a/kernel/bpf/trampoline.c
+++ b/kernel/bpf/trampoline.c
@@ -160,6 +160,14 @@ static int bpf_trampoline_update(struct bpf_trampoline *tr)
        if (fexit_cnt)
                flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME;
 
+       /* Though the second half of trampoline page is unused a task could be
+        * preempted in the middle of the first half of trampoline and two
+        * updates to trampoline would change the code from underneath the
+        * preempted task. Hence wait for tasks to voluntarily schedule or go
+        * to userspace.
+        */
+       synchronize_rcu_tasks();
+
        err = arch_prepare_bpf_trampoline(new_image, new_image + PAGE_SIZE / 2,
                                          &tr->func.model, flags,
                                          fentry, fentry_cnt,
@@ -251,6 +259,8 @@ void bpf_trampoline_put(struct bpf_trampoline *tr)
                goto out;
        if (WARN_ON_ONCE(!hlist_empty(&tr->progs_hlist[BPF_TRAMP_FEXIT])))
                goto out;
+       /* wait for tasks to get out of trampoline before freeing it */
+       synchronize_rcu_tasks();
        bpf_jit_free_exec(tr->image);
        hlist_del(&tr->hlist);
        kfree(tr);