1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/*
* Check decoding of lsm_set_self_attr syscall.
*
* Copyright (c) 2024 Dmitry V. Levin <ldv@strace.io>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <linux/lsm.h>
static const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
static const char *errstr;
static long
k_lsm_set_self_attr(const unsigned int attr, const void *p_ctx,
const uint32_t size, const uint32_t flags)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t arg1 = fill | attr;
const kernel_ulong_t arg2 = (uintptr_t) p_ctx;
const kernel_ulong_t arg3 = fill | size;
const kernel_ulong_t arg4 = fill | flags;
const long rc = syscall(__NR_lsm_set_self_attr,
arg1, arg2, arg3, arg4, bad, bad);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
k_lsm_set_self_attr(0, 0, 0, 0);
printf("lsm_set_self_attr(LSM_ATTR_UNDEF, NULL, 0, 0) = %s\n", errstr);
struct lsm_ctx *const ctx =
midtail_alloc(sizeof(*ctx), 2);
fill_memory(ctx, sizeof(*ctx));
const void *const bad_ctx = (void *) ctx + 1;
const unsigned int bad_attr = 0xfacefed1;
const uint32_t bad_flags = 0xfacefed2;
uint32_t size = 0xdeadbeef;
k_lsm_set_self_attr(bad_attr, bad_ctx, size, bad_flags);
printf("lsm_set_self_attr(%#x /* LSM_ATTR_??? */, %p, %u, %#x) = %s\n",
bad_attr, bad_ctx, size, bad_flags, errstr);
ctx->ctx_len = 0;
k_lsm_set_self_attr(LSM_ATTR_CURRENT, ctx, size, 1);
printf("lsm_set_self_attr(%s, {id=%#jx, flags=%#jx, len=%ju"
", ctx_len=%ju}, %u, 0x1) = %s\n",
"LSM_ATTR_CURRENT", (uintmax_t) ctx->id, (uintmax_t) ctx->flags,
(uintmax_t) ctx->len, (uintmax_t) ctx->ctx_len,
size, errstr);
ctx->ctx_len = 1;
k_lsm_set_self_attr(LSM_ATTR_CURRENT, ctx, size, 2);
printf("lsm_set_self_attr(%s, {id=%#jx, flags=%#jx, len=%ju"
", ctx_len=%ju, ctx=%p}, %u, 0x2) = %s\n",
"LSM_ATTR_CURRENT", (uintmax_t) ctx->id, (uintmax_t) ctx->flags,
(uintmax_t) ctx->len, (uintmax_t) ctx->ctx_len,
ctx->ctx, size, errstr);
ctx->ctx_len = 2;
void *ctx2 = (void *) ctx - ctx->ctx_len;
memmove(ctx2, ctx, sizeof(*ctx));
fill_memory((void *) (ctx + 1) - 2, 2);
k_lsm_set_self_attr(LSM_ATTR_CURRENT, ctx2, size, 3);
memmove(ctx, ctx2, sizeof(*ctx));
printf("lsm_set_self_attr(%s, {id=%#jx, flags=%#jx, len=%ju"
", ctx_len=%ju, ctx=\"\\x80\\x81\"}, %u, 0x3) = %s\n",
"LSM_ATTR_CURRENT", (uintmax_t) ctx->id, (uintmax_t) ctx->flags,
(uintmax_t) ctx->len, (uintmax_t) ctx->ctx_len,
size, errstr);
puts("+++ exited with 0 +++");
return 0;
}
|
