linux-kernel - [PATCH AUTOSEL 4.20 24/60] bpf/test_run: fix unkillable BPF_PROG_TEST

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Date:   Wed, 13 Mar 2019 15:09:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Stanislav Fomichev <sdf@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 4.20 24/60] bpf/test_run: fix unkillable BPF_PROG_TEST_RUN

From: Stanislav Fomichev <sdf@...gle.com>

[ Upstream commit df1a2cb7c74b3d3abc8d8c2d690f82c8ebc3490a ]

Syzbot found out that running BPF_PROG_TEST_RUN with repeat=0xffffffff
makes process unkillable. The problem is that when CONFIG_PREEMPT is
enabled, we never see need_resched() return true. This is due to the
fact that preempt_enable() (which we do in bpf_test_run_one on each
iteration) now handles resched if it's needed.

Let's disable preemption for the whole run, not per test. In this case
we can properly see whether resched is needed.
Let's also properly return -EINTR to the userspace in case of a signal
interrupt.

See recent discussion:
http://lore.kernel.org/netdev/CAH3MdRWHr4N8jei8jxDppXjmw-Nw=puNDLbu1dQOFQHxfU2onA@mail.gmail.com

I'll follow up with the same fix bpf_prog_test_run_flow_dissector in
bpf-next.

Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bpf/test_run.c | 45 ++++++++++++++++++++++++---------------------
 1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 25001913d03b..14a631817e12 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -13,27 +13,13 @@
 #include <net/sock.h>
 #include <net/tcp.h>
 
-static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx,
-		struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE])
-{
-	u32 ret;
-
-	preempt_disable();
-	rcu_read_lock();
-	bpf_cgroup_storage_set(storage);
-	ret = BPF_PROG_RUN(prog, ctx);
-	rcu_read_unlock();
-	preempt_enable();
-
-	return ret;
-}
-
-static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *ret,
-			u32 *time)
+static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
+			u32 *retval, u32 *time)
 {
 	struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { 0 };
 	enum bpf_cgroup_storage_type stype;
 	u64 time_start, time_spent = 0;
+	int ret = 0;
 	u32 i;
 
 	for_each_cgroup_storage_type(stype) {
@@ -48,25 +34,42 @@ static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *ret,
 
 	if (!repeat)
 		repeat = 1;
+
+	rcu_read_lock();
+	preempt_disable();
 	time_start = ktime_get_ns();
 	for (i = 0; i < repeat; i++) {
-		*ret = bpf_test_run_one(prog, ctx, storage);
+		bpf_cgroup_storage_set(storage);
+		*retval = BPF_PROG_RUN(prog, ctx);
+
+		if (signal_pending(current)) {
+			ret = -EINTR;
+			break;
+		}
+
 		if (need_resched()) {
-			if (signal_pending(current))
-				break;
 			time_spent += ktime_get_ns() - time_start;
+			preempt_enable();
+			rcu_read_unlock();
+
 			cond_resched();
+
+			rcu_read_lock();
+			preempt_disable();
 			time_start = ktime_get_ns();
 		}
 	}
 	time_spent += ktime_get_ns() - time_start;
+	preempt_enable();
+	rcu_read_unlock();
+
 	do_div(time_spent, repeat);
 	*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
 
 	for_each_cgroup_storage_type(stype)
 		bpf_cgroup_storage_free(storage[stype]);
 
-	return 0;
+	return ret;
 }
 
 static int bpf_test_finish(const union bpf_attr *kattr,
-- 
2.19.1