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Date: Sun, 18 Nov 2018 05:53:35 +0000
From: Y Song <ys114321@...il.com>
To: lmb@...udflare.com
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
netdev <netdev@...r.kernel.org>, linux-api@...r.kernel.org
Subject: Re: [PATCH 2/3] libbpf: require size hint in bpf_prog_test_run
On Fri, Nov 16, 2018 at 12:54 PM Lorenz Bauer <lmb@...udflare.com> wrote:
>
> Require size_out to be non-NULL if data_out is given. This prevents
> accidental overwriting of process memory after the output buffer.
>
> Adjust callers of bpf_prog_test_run to this behaviour.
>
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> ---
> tools/lib/bpf/bpf.c | 4 +++-
> tools/testing/selftests/bpf/test_progs.c | 10 ++++++++++
> 2 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
> index 03f9bcc4ef50..127a9aa6170e 100644
> --- a/tools/lib/bpf/bpf.c
> +++ b/tools/lib/bpf/bpf.c
> @@ -403,10 +403,12 @@ int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
> attr.test.data_in = ptr_to_u64(data);
> attr.test.data_out = ptr_to_u64(data_out);
> attr.test.data_size_in = size;
> + if (data_out)
> + attr.test.data_size_out = *size_out;
Maybe it is better to return error (-EINVAL) instead of segfault if
size_out is NULL?
we should try to avoid segfault inside the library. This will change
original API behavior, but
I think it is okay since it is in the user space.
> attr.test.repeat = repeat;
>
> ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
> - if (size_out)
> + if (data_out)
> *size_out = attr.test.data_size_out;
> if (retval)
> *retval = attr.test.retval;
> diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
> index 2d3c04f45530..560d7527b86b 100644
> --- a/tools/testing/selftests/bpf/test_progs.c
> +++ b/tools/testing/selftests/bpf/test_progs.c
> @@ -150,6 +150,7 @@ static void test_xdp(void)
> bpf_map_update_elem(map_fd, &key4, &value4, 0);
> bpf_map_update_elem(map_fd, &key6, &value6, 0);
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
> buf, &size, &retval, &duration);
>
> @@ -158,6 +159,7 @@ static void test_xdp(void)
> "err %d errno %d retval %d size %d\n",
> err, errno, retval, size);
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, 1, &pkt_v6, sizeof(pkt_v6),
> buf, &size, &retval, &duration);
> CHECK(err || retval != XDP_TX || size != 114 ||
> @@ -182,6 +184,7 @@ static void test_xdp_adjust_tail(void)
> return;
> }
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
> buf, &size, &retval, &duration);
>
> @@ -189,6 +192,7 @@ static void test_xdp_adjust_tail(void)
> "ipv4", "err %d errno %d retval %d size %d\n",
> err, errno, retval, size);
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, 1, &pkt_v6, sizeof(pkt_v6),
> buf, &size, &retval, &duration);
> CHECK(err || retval != XDP_TX || size != 54,
> @@ -252,6 +256,7 @@ static void test_l4lb(const char *file)
> goto out;
> bpf_map_update_elem(map_fd, &real_num, &real_def, 0);
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v4, sizeof(pkt_v4),
> buf, &size, &retval, &duration);
> CHECK(err || retval != 7/*TC_ACT_REDIRECT*/ || size != 54 ||
> @@ -259,6 +264,7 @@ static void test_l4lb(const char *file)
> "err %d errno %d retval %d size %d magic %x\n",
> err, errno, retval, size, *magic);
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v6, sizeof(pkt_v6),
> buf, &size, &retval, &duration);
> CHECK(err || retval != 7/*TC_ACT_REDIRECT*/ || size != 74 ||
> @@ -341,6 +347,7 @@ static void test_xdp_noinline(void)
> goto out;
> bpf_map_update_elem(map_fd, &real_num, &real_def, 0);
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v4, sizeof(pkt_v4),
> buf, &size, &retval, &duration);
> CHECK(err || retval != 1 || size != 54 ||
> @@ -348,6 +355,7 @@ static void test_xdp_noinline(void)
> "err %d errno %d retval %d size %d magic %x\n",
> err, errno, retval, size, *magic);
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v6, sizeof(pkt_v6),
> buf, &size, &retval, &duration);
> CHECK(err || retval != 1 || size != 74 ||
> @@ -1795,6 +1803,7 @@ static void test_queue_stack_map(int type)
> pkt_v4.iph.saddr = vals[MAP_SIZE - 1 - i] * 5;
> }
>
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
> buf, &size, &retval, &duration);
> if (err || retval || size != sizeof(pkt_v4) ||
> @@ -1808,6 +1817,7 @@ static void test_queue_stack_map(int type)
> err, errno, retval, size, iph->daddr);
>
> /* Queue is empty, program should return TC_ACT_SHOT */
> + size = sizeof(buf);
> err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
> buf, &size, &retval, &duration);
> CHECK(err || retval != 2 /* TC_ACT_SHOT */|| size != sizeof(pkt_v4),
> --
> 2.17.1
>
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