From: Daniel Xu <dxu@dxuuu.xyz>
To: bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
ast@kernel.org, daniel@iogearbox.net, songliubraving@fb.com,
andrii.nakryiko@gmail.com
Cc: Daniel Xu <dxu@dxuuu.xyz>, kernel-team@fb.com
Subject: [PATCH bpf v4 2/2] selftest/bpf: Test bpf_probe_read_user_str() strips trailing bytes after NUL
Date: Thu, 5 Nov 2020 16:06:35 -0800 [thread overview]
Message-ID: <8b8c8f51aff8fabac4425da9b0054b4c976c944b.1604620776.git.dxu@dxuuu.xyz> (raw)
In-Reply-To: <cover.1604620776.git.dxu@dxuuu.xyz>
Previously, bpf_probe_read_user_str() could potentially overcopy the
trailing bytes after the NUL due to how do_strncpy_from_user() does the
copy in long-sized strides. The issue has been fixed in the previous
commit.
This commit adds a selftest that ensures we don't regress
bpf_probe_read_user_str() again.
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
---
.../bpf/prog_tests/probe_read_user_str.c | 71 +++++++++++++++++++
.../bpf/progs/test_probe_read_user_str.c | 25 +++++++
2 files changed, 96 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/probe_read_user_str.c
create mode 100644 tools/testing/selftests/bpf/progs/test_probe_read_user_str.c
diff --git a/tools/testing/selftests/bpf/prog_tests/probe_read_user_str.c b/tools/testing/selftests/bpf/prog_tests/probe_read_user_str.c
new file mode 100644
index 000000000000..e419298132b5
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/probe_read_user_str.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "test_probe_read_user_str.skel.h"
+
+static const char str1[] = "mestring";
+static const char str2[] = "mestringalittlebigger";
+static const char str3[] = "mestringblubblubblubblubblub";
+
+static int test_one_str(struct test_probe_read_user_str *skel, const char *str,
+ size_t len)
+{
+ int err, duration = 0;
+ char buf[256];
+
+ /* Ensure bytes after string are ones */
+ memset(buf, 1, sizeof(buf));
+ memcpy(buf, str, len);
+
+ /* Give prog our userspace pointer */
+ skel->bss->user_ptr = buf;
+
+ /* Trigger tracepoint */
+ usleep(1);
+
+ /* Did helper fail? */
+ if (CHECK(skel->bss->ret < 0, "prog_ret", "prog returned: %ld\n",
+ skel->bss->ret))
+ return 1;
+
+ /* Check that string was copied correctly */
+ err = memcmp(skel->bss->buf, str, len);
+ if (CHECK(err, "memcmp", "prog copied wrong string"))
+ return 1;
+
+ /* Now check that no extra trailing bytes were copied */
+ memset(buf, 0, sizeof(buf));
+ err = memcmp(skel->bss->buf + len, buf, sizeof(buf) - len);
+ if (CHECK(err, "memcmp", "trailing bytes were not stripped"))
+ return 1;
+
+ return 0;
+}
+
+void test_probe_read_user_str(void)
+{
+ struct test_probe_read_user_str *skel;
+ int err, duration = 0;
+
+ skel = test_probe_read_user_str__open_and_load();
+ if (CHECK(!skel, "test_probe_read_user_str__open_and_load",
+ "skeleton open and load failed\n"))
+ return;
+
+ /* Give pid to bpf prog so it doesn't read from anyone else */
+ skel->bss->pid = getpid();
+
+ err = test_probe_read_user_str__attach(skel);
+ if (CHECK(err, "test_probe_read_user_str__attach",
+ "skeleton attach failed: %d\n", err))
+ goto out;
+
+ if (test_one_str(skel, str1, sizeof(str1)))
+ goto out;
+ if (test_one_str(skel, str2, sizeof(str2)))
+ goto out;
+ if (test_one_str(skel, str3, sizeof(str3)))
+ goto out;
+
+out:
+ test_probe_read_user_str__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_probe_read_user_str.c b/tools/testing/selftests/bpf/progs/test_probe_read_user_str.c
new file mode 100644
index 000000000000..3ae398b75dcd
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_probe_read_user_str.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+#include <sys/types.h>
+
+pid_t pid = 0;
+long ret = 0;
+void *user_ptr = 0;
+char buf[256] = {};
+
+SEC("tracepoint/syscalls/sys_enter_nanosleep")
+int on_write(void *ctx)
+{
+ if (pid != (bpf_get_current_pid_tgid() >> 32))
+ return 0;
+
+ ret = bpf_probe_read_user_str(buf, sizeof(buf), user_ptr);
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.28.0
next prev parent reply other threads:[~2020-11-06 0:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 0:06 [PATCH bpf v4 0/2] Fix bpf_probe_read_user_str() overcopying Daniel Xu
2020-11-06 0:06 ` [PATCH bpf v4 1/2] lib/strncpy_from_user.c: Don't overcopy bytes after NUL terminator Daniel Xu
2020-11-06 0:15 ` Song Liu
2020-11-09 16:30 ` patchwork-bot+netdevbpf
2020-11-06 0:06 ` Daniel Xu [this message]
2020-11-06 0:19 ` [PATCH bpf v4 2/2] selftest/bpf: Test bpf_probe_read_user_str() strips trailing bytes after NUL Song Liu
2020-11-06 3:53 ` Andrii Nakryiko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8b8c8f51aff8fabac4425da9b0054b4c976c944b.1604620776.git.dxu@dxuuu.xyz \
--to=dxu@dxuuu.xyz \
--cc=andrii.nakryiko@gmail.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=kernel-team@fb.com \
--cc=linux-kernel@vger.kernel.org \
--cc=songliubraving@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).