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Message-ID: <CAEf4BzYrek8shqzUj+zNC=TjGkDPCKUFP=YnbiNf6360f1MyTw@mail.gmail.com>
Date: Wed, 5 Aug 2020 13:15:05 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Carlos Neira <cneirabustos@...il.com>
Cc: Networking <netdev@...r.kernel.org>, Yonghong Song <yhs@...com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v4 bpf-next] bpf/selftests: fold test_current_pid_tgid_new_ns
into test_progs.
On Wed, Aug 5, 2020 at 1:06 PM Carlos Neira <cneirabustos@...il.com> wrote:
>
> Currently tests for bpf_get_ns_current_pid_tgid() are outside test_progs.
> This change folds a test case into test_progs.
>
> Changes from V3:
> - STAT(2) check changed from CHECK_FAIL to CHECK.
> - Changed uses of _open_ to _open_and_load.
> - Fixed error codes were not being returned on exit.
> - Removed unnecessary dependency on Makefile
>
> Signed-off-by: Carlos Neira <cneirabustos@...il.com>
> ---
bpf-next is closed, you'll have to re-submit once it opens in roughly
two weeks. Looks good overall, few minor things below, please
incorporate into next revision with my ack:
Acked-by: Andrii Nakryiko <andriin@...com>
> tools/testing/selftests/bpf/.gitignore | 2 +-
> tools/testing/selftests/bpf/Makefile | 4 +-
> .../bpf/prog_tests/ns_current_pid_tgid.c | 85 ----------
> .../bpf/prog_tests/ns_current_pidtgid.c | 54 ++++++
> .../bpf/progs/test_ns_current_pid_tgid.c | 37 ----
> .../bpf/progs/test_ns_current_pidtgid.c | 25 +++
> .../bpf/test_current_pid_tgid_new_ns.c | 159 ------------------
> .../bpf/test_ns_current_pidtgid_newns.c | 91 ++++++++++
> 8 files changed, 173 insertions(+), 284 deletions(-)
> delete mode 100644 tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c
> create mode 100644 tools/testing/selftests/bpf/prog_tests/ns_current_pidtgid.c
> delete mode 100644 tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c
> create mode 100644 tools/testing/selftests/bpf/progs/test_ns_current_pidtgid.c
> delete mode 100644 tools/testing/selftests/bpf/test_current_pid_tgid_new_ns.c
> create mode 100644 tools/testing/selftests/bpf/test_ns_current_pidtgid_newns.c
>
> diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
> index 1bb204cee853..022055f23592 100644
> --- a/tools/testing/selftests/bpf/.gitignore
> +++ b/tools/testing/selftests/bpf/.gitignore
> @@ -30,8 +30,8 @@ test_tcpnotify_user
> test_libbpf
> test_tcp_check_syncookie_user
> test_sysctl
> -test_current_pid_tgid_new_ns
> xdping
> +test_ns_current_pidtgid_newns
> test_cpp
> *.skel.h
> /no_alu32
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index e7a8cf83ba48..92fb616cdd27 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -36,8 +36,8 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
> test_sock test_btf test_sockmap get_cgroup_id_user test_socket_cookie \
> test_cgroup_storage \
> test_netcnt test_tcpnotify_user test_sock_fields test_sysctl \
> - test_progs-no_alu32 \
> - test_current_pid_tgid_new_ns
> + test_progs-no_alu32\
accidentally removed space?
> + test_ns_current_pidtgid_newns
>
> # Also test bpf-gcc, if present
> ifneq ($(BPF_GCC),)
[...]
> +
> +void test_ns_current_pidtgid(void)
> +{
> + struct test_ns_current_pidtgid__bss *bss;
> + struct test_ns_current_pidtgid *skel;
> + int err, duration = 0;
> + struct stat st;
> + __u64 id;
> +
> + skel = test_ns_current_pidtgid__open_and_load();
> + CHECK(!skel, "skel_open_load", "failed to load skeleton\n");
> + goto cleanup;
> +
> + pid_t tid = syscall(SYS_gettid);
> + pid_t pid = getpid();
hm... I probably missed this last time. This is not a valid C89
standard-compliant code, all variables have to be declared up top,
please split variable declaration and initialization.
> +
> + id = (__u64) tid << 32 | pid;
> +
> + err = stat("/proc/self/ns/pid", &st);
> + if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d", err))
> + goto cleanup;
> +
[...]
> diff --git a/tools/testing/selftests/bpf/progs/test_ns_current_pidtgid.c b/tools/testing/selftests/bpf/progs/test_ns_current_pidtgid.c
> new file mode 100644
> index 000000000000..9818a56510d9
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_ns_current_pidtgid.c
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2019 Carlos Neira cneirabustos@...il.com */
> +
> +#include <linux/bpf.h>
> +#include <stdint.h>
> +#include <bpf/bpf_helpers.h>
> +
> +__u64 user_pid_tgid = 0;
> +__u64 dev = 0;
> +__u64 ino = 0;
> +
> +SEC("raw_tracepoint/sys_enter")
> +int handler(const void *ctx)
> +{
> + struct bpf_pidns_info nsdata;
> +
> + if (bpf_get_ns_current_pid_tgid(dev, ino, &nsdata,
> + sizeof(struct bpf_pidns_info)))
> + return 0;
> + user_pid_tgid = (__u64)nsdata.tgid << 32 | nsdata.pid;
nit: good idea to put () around << expression when combined with other
bitwise operators.
> +
> + return 0;
> +}
> +
> +char _license[] SEC("license") = "GPL";
[...]
> +static int newns_pidtgid(void *arg)
> +{
> + struct test_ns_current_pidtgid__bss *bss;
> + struct test_ns_current_pidtgid *skel;
> + int pidns_fd = 0, err = 0;
> + pid_t pid, tid;
> + struct stat st;
> + __u64 id;
> +
> + skel = test_ns_current_pidtgid__open_and_load();
> + if (!skel) {
> + perror("Failed to load skeleton");
> + goto cleanup;
> + }
> +
> + tid = syscall(SYS_gettid);
> + pid = getpid();
> + id = (__u64) tid << 32 | pid;
see, you don't do it here :)
> +
> + if (stat("/proc/self/ns/pid", &st)) {
> + printf("Failed to stat /proc/self/ns/pid: %s\n",
> + strerror(errno));
> + goto cleanup;
> + }
> +
> + bss = skel->bss;
> + bss->dev = st.st_dev;
> + bss->ino = st.st_ino;
> + bss->user_pid_tgid = 0;
> +
[...]
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