Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
3#include <test_progs.h>
4#include <sys/mman.h>
5
6#include "stream.skel.h"
7#include "stream_fail.skel.h"
8
9void test_stream_failure(void)
10{
11 RUN_TESTS(stream_fail);
12}
13
14void test_stream_success(void)
15{
16 RUN_TESTS(stream);
17 return;
18}
19
20void test_stream_syscall(void)
21{
22 LIBBPF_OPTS(bpf_test_run_opts, opts);
23 LIBBPF_OPTS(bpf_prog_stream_read_opts, ropts);
24 struct stream *skel;
25 int ret, prog_fd;
26 char buf[64];
27
28 skel = stream__open_and_load();
29 if (!ASSERT_OK_PTR(skel, "stream__open_and_load"))
30 return;
31
32 prog_fd = bpf_program__fd(skel->progs.stream_syscall);
33 ret = bpf_prog_test_run_opts(prog_fd, &opts);
34 ASSERT_OK(ret, "ret");
35 ASSERT_OK(opts.retval, "retval");
36
37 ASSERT_LT(bpf_prog_stream_read(0, BPF_STREAM_STDOUT, buf, sizeof(buf), &ropts), 0, "error");
38 ret = -errno;
39 ASSERT_EQ(ret, -EINVAL, "bad prog_fd");
40
41 ASSERT_LT(bpf_prog_stream_read(prog_fd, 0, buf, sizeof(buf), &ropts), 0, "error");
42 ret = -errno;
43 ASSERT_EQ(ret, -ENOENT, "bad stream id");
44
45 ASSERT_LT(bpf_prog_stream_read(prog_fd, BPF_STREAM_STDOUT, NULL, sizeof(buf), NULL), 0, "error");
46 ret = -errno;
47 ASSERT_EQ(ret, -EFAULT, "bad stream buf");
48
49 ret = bpf_prog_stream_read(prog_fd, BPF_STREAM_STDOUT, buf, 2, NULL);
50 ASSERT_EQ(ret, 2, "bytes");
51 ret = bpf_prog_stream_read(prog_fd, BPF_STREAM_STDOUT, buf, 2, NULL);
52 ASSERT_EQ(ret, 1, "bytes");
53 ret = bpf_prog_stream_read(prog_fd, BPF_STREAM_STDOUT, buf, 1, &ropts);
54 ASSERT_EQ(ret, 0, "no bytes stdout");
55 ret = bpf_prog_stream_read(prog_fd, BPF_STREAM_STDERR, buf, 1, &ropts);
56 ASSERT_EQ(ret, 0, "no bytes stderr");
57
58 stream__destroy(skel);
59}
60
61static void test_address(struct bpf_program *prog, unsigned long *fault_addr_p)
62{
63 LIBBPF_OPTS(bpf_test_run_opts, opts);
64 LIBBPF_OPTS(bpf_prog_stream_read_opts, ropts);
65 int ret, prog_fd;
66 char fault_addr[64];
67 char buf[1024];
68
69 prog_fd = bpf_program__fd(prog);
70
71 ret = bpf_prog_test_run_opts(prog_fd, &opts);
72 ASSERT_OK(ret, "ret");
73 ASSERT_OK(opts.retval, "retval");
74
75 sprintf(fault_addr, "0x%lx", *fault_addr_p);
76
77 ret = bpf_prog_stream_read(prog_fd, BPF_STREAM_STDERR, buf, sizeof(buf), &ropts);
78 ASSERT_GT(ret, 0, "stream read");
79 ASSERT_LE(ret, 1023, "len for buf");
80 buf[ret] = '\0';
81
82 if (!ASSERT_HAS_SUBSTR(buf, fault_addr, "fault_addr")) {
83 fprintf(stderr, "Output from stream:\n%s\n", buf);
84 fprintf(stderr, "Fault Addr: %s\n", fault_addr);
85 }
86}
87
88void test_stream_arena_fault_address(void)
89{
90 struct stream *skel;
91
92#if !defined(__x86_64__) && !defined(__aarch64__)
93 printf("%s:SKIP: arena fault reporting not supported\n", __func__);
94 test__skip();
95 return;
96#endif
97
98 skel = stream__open_and_load();
99 if (!ASSERT_OK_PTR(skel, "stream__open_and_load"))
100 return;
101
102 if (test__start_subtest("read_fault"))
103 test_address(skel->progs.stream_arena_read_fault, &skel->bss->fault_addr);
104 if (test__start_subtest("write_fault"))
105 test_address(skel->progs.stream_arena_write_fault, &skel->bss->fault_addr);
106
107 stream__destroy(skel);
108}