linux-kernel - [PATCH v5 bpf-next 11/14] bpf/test_run: support cgroup local storage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180801213649.30751-12-guro@fb.com>
Date:   Wed, 1 Aug 2018 14:36:46 -0700
From:   Roman Gushchin <guro@...com>
To:     <netdev@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <kernel-team@...com>,
        Roman Gushchin <guro@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH v5 bpf-next 11/14] bpf/test_run: support cgroup local storage

Allocate a temporary cgroup storage to use for bpf program test runs.

Because the test program is not actually attached to a cgroup,
the storage is allocated manually just for the execution
of the bpf program.

If the program is executed multiple times, the storage is not zeroed
on each run, emulating multiple runs of the program, attached to
a real cgroup.

Signed-off-by: Roman Gushchin <guro@...com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Martin KaFai Lau <kafai@...com>
---
 net/bpf/test_run.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 22a78eedf4b1..f4078830ea50 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -11,12 +11,14 @@
 #include <linux/filter.h>
 #include <linux/sched/signal.h>
 
-static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx)
+static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx,
+					    struct bpf_cgroup_storage *storage)
 {
 	u32 ret;
 
 	preempt_disable();
 	rcu_read_lock();
+	bpf_cgroup_storage_set(storage);
 	ret = BPF_PROG_RUN(prog, ctx);
 	rcu_read_unlock();
 	preempt_enable();
@@ -26,14 +28,19 @@ static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx)
 
 static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
 {
+	struct bpf_cgroup_storage *storage = NULL;
 	u64 time_start, time_spent = 0;
 	u32 ret = 0, i;
 
+	storage = bpf_cgroup_storage_alloc(prog);
+	if (IS_ERR(storage))
+		return PTR_ERR(storage);
+
 	if (!repeat)
 		repeat = 1;
 	time_start = ktime_get_ns();
 	for (i = 0; i < repeat; i++) {
-		ret = bpf_test_run_one(prog, ctx);
+		ret = bpf_test_run_one(prog, ctx, storage);
 		if (need_resched()) {
 			if (signal_pending(current))
 				break;
@@ -46,6 +53,8 @@ static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
 	do_div(time_spent, repeat);
 	*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
 
+	bpf_cgroup_storage_free(storage);
+
 	return ret;
 }
 
-- 
2.14.4