Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2024. Huawei Technologies Co., Ltd */
3#include "test_progs.h"
4#include "read_vsyscall.skel.h"
5
6#if defined(__x86_64__)
7/* For VSYSCALL_ADDR */
8#include <asm/vsyscall.h>
9#else
10/* To prevent build failure on non-x86 arch */
11#define VSYSCALL_ADDR 0UL
12#endif
13
14struct read_ret_desc {
15 const char *name;
16 int ret;
17} all_read[] = {
18 { .name = "probe_read_kernel", .ret = -ERANGE },
19 { .name = "probe_read_kernel_str", .ret = -ERANGE },
20 { .name = "probe_read", .ret = -ERANGE },
21 { .name = "probe_read_str", .ret = -ERANGE },
22 { .name = "probe_read_user", .ret = -EFAULT },
23 { .name = "probe_read_user_str", .ret = -EFAULT },
24 { .name = "copy_from_user", .ret = -EFAULT },
25 { .name = "copy_from_user_task", .ret = -EFAULT },
26 { .name = "copy_from_user_str", .ret = -EFAULT },
27 { .name = "copy_from_user_task_str", .ret = -EFAULT },
28};
29
30void test_read_vsyscall(void)
31{
32 struct read_vsyscall *skel;
33 unsigned int i;
34 int err;
35
36#if !defined(__x86_64__)
37 test__skip();
38 return;
39#endif
40 skel = read_vsyscall__open_and_load();
41 if (!ASSERT_OK_PTR(skel, "read_vsyscall open_load"))
42 return;
43
44 skel->bss->target_pid = getpid();
45 err = read_vsyscall__attach(skel);
46 if (!ASSERT_EQ(err, 0, "read_vsyscall attach"))
47 goto out;
48
49 /* userspace may don't have vsyscall page due to LEGACY_VSYSCALL_NONE,
50 * but it doesn't affect the returned error codes.
51 */
52 skel->bss->user_ptr = (void *)VSYSCALL_ADDR;
53 usleep(1);
54
55 for (i = 0; i < ARRAY_SIZE(all_read); i++)
56 ASSERT_EQ(skel->bss->read_ret[i], all_read[i].ret, all_read[i].name);
57out:
58 read_vsyscall__destroy(skel);
59}