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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023 SUSE LLC */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "../../../include/linux/filter.h"
#include "bpf_misc.h"
SEC("?raw_tp")
__success __log_level(2)
__msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
__msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0xfffffff8 goto pc+2")
__msg("mark_precise: frame0: regs=r2 stack= before 1: (87) r2 = -r2")
__msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 8")
__naked int bpf_neg(void)
{
asm volatile (
"r2 = 8;"
"r2 = -r2;"
"if r2 != -8 goto 1f;"
"r1 = r10;"
"r1 += r2;"
"1:"
"r0 = 0;"
"exit;"
::: __clobber_all);
}
SEC("?raw_tp")
__success __log_level(2)
__msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
__msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0x0 goto pc+2")
__msg("mark_precise: frame0: regs=r2 stack= before 1: (d4) r2 = le16 r2")
__msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 0")
__naked int bpf_end_to_le(void)
{
asm volatile (
"r2 = 0;"
"r2 = le16 r2;"
"if r2 != 0 goto 1f;"
"r1 = r10;"
"r1 += r2;"
"1:"
"r0 = 0;"
"exit;"
::: __clobber_all);
}
SEC("?raw_tp")
__success __log_level(2)
__msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
__msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0x0 goto pc+2")
__msg("mark_precise: frame0: regs=r2 stack= before 1: (dc) r2 = be16 r2")
__msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 0")
__naked int bpf_end_to_be(void)
{
asm volatile (
"r2 = 0;"
"r2 = be16 r2;"
"if r2 != 0 goto 1f;"
"r1 = r10;"
"r1 += r2;"
"1:"
"r0 = 0;"
"exit;"
::: __clobber_all);
}
#if (defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \
(defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64) || \
defined(__TARGET_ARCH_arm) || defined(__TARGET_ARCH_s390)) && \
__clang_major__ >= 18
SEC("?raw_tp")
__success __log_level(2)
__msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
__msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0x0 goto pc+2")
__msg("mark_precise: frame0: regs=r2 stack= before 1: (d7) r2 = bswap16 r2")
__msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 0")
__naked int bpf_end_bswap(void)
{
asm volatile (
"r2 = 0;"
"r2 = bswap16 r2;"
"if r2 != 0 goto 1f;"
"r1 = r10;"
"r1 += r2;"
"1:"
"r0 = 0;"
"exit;"
::: __clobber_all);
}
#ifdef CAN_USE_LOAD_ACQ_STORE_REL
SEC("?raw_tp")
__success __log_level(2)
__msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r3 = r10")
__msg("mark_precise: frame0: regs=r2 stack= before 2: (db) r2 = load_acquire((u64 *)(r10 -8))")
__msg("mark_precise: frame0: regs= stack=-8 before 1: (7b) *(u64 *)(r10 -8) = r1")
__msg("mark_precise: frame0: regs=r1 stack= before 0: (b7) r1 = 8")
__naked int bpf_load_acquire(void)
{
asm volatile (
"r1 = 8;"
"*(u64 *)(r10 - 8) = r1;"
".8byte %[load_acquire_insn];" /* r2 = load_acquire((u64 *)(r10 - 8)); */
"r3 = r10;"
"r3 += r2;" /* mark_precise */
"r0 = 0;"
"exit;"
:
: __imm_insn(load_acquire_insn,
BPF_ATOMIC_OP(BPF_DW, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -8))
: __clobber_all);
}
SEC("?raw_tp")
__success __log_level(2)
__msg("mark_precise: frame0: regs=r1 stack= before 3: (bf) r2 = r10")
__msg("mark_precise: frame0: regs=r1 stack= before 2: (79) r1 = *(u64 *)(r10 -8)")
__msg("mark_precise: frame0: regs= stack=-8 before 1: (db) store_release((u64 *)(r10 -8), r1)")
__msg("mark_precise: frame0: regs=r1 stack= before 0: (b7) r1 = 8")
__naked int bpf_store_release(void)
{
asm volatile (
"r1 = 8;"
".8byte %[store_release_insn];" /* store_release((u64 *)(r10 - 8), r1); */
"r1 = *(u64 *)(r10 - 8);"
"r2 = r10;"
"r2 += r1;" /* mark_precise */
"r0 = 0;"
"exit;"
:
: __imm_insn(store_release_insn,
BPF_ATOMIC_OP(BPF_DW, BPF_STORE_REL, BPF_REG_10, BPF_REG_1, -8))
: __clobber_all);
}
#endif /* CAN_USE_LOAD_ACQ_STORE_REL */
#endif /* v4 instruction */
SEC("?raw_tp")
__success __log_level(2)
/*
* Without the bug fix there will be no history between "last_idx 3 first_idx 3"
* and "parent state regs=" lines. "R0_w=6" parts are here to help anchor
* expected log messages to the one specific mark_chain_precision operation.
*
* This is quite fragile: if verifier checkpointing heuristic changes, this
* might need adjusting.
*/
__msg("2: (07) r0 += 1 ; R0_w=6")
__msg("3: (35) if r0 >= 0xa goto pc+1")
__msg("mark_precise: frame0: last_idx 3 first_idx 3 subseq_idx -1")
__msg("mark_precise: frame0: regs=r0 stack= before 2: (07) r0 += 1")
__msg("mark_precise: frame0: regs=r0 stack= before 1: (07) r0 += 1")
__msg("mark_precise: frame0: regs=r0 stack= before 4: (05) goto pc-4")
__msg("mark_precise: frame0: regs=r0 stack= before 3: (35) if r0 >= 0xa goto pc+1")
__msg("mark_precise: frame0: parent state regs= stack=: R0_rw=P4")
__msg("3: R0_w=6")
__naked int state_loop_first_last_equal(void)
{
asm volatile (
"r0 = 0;"
"l0_%=:"
"r0 += 1;"
"r0 += 1;"
/* every few iterations we'll have a checkpoint here with
* first_idx == last_idx, potentially confusing precision
* backtracking logic
*/
"if r0 >= 10 goto l1_%=;" /* checkpoint + mark_precise */
"goto l0_%=;"
"l1_%=:"
"exit;"
::: __clobber_common
);
}
__used __naked static void __bpf_cond_op_r10(void)
{
asm volatile (
"r2 = 2314885393468386424 ll;"
"goto +0;"
"if r2 <= r10 goto +3;"
"if r1 >= -1835016 goto +0;"
"if r2 <= 8 goto +0;"
"if r3 <= 0 goto +0;"
"exit;"
::: __clobber_all);
}
SEC("?raw_tp")
__success __log_level(2)
__msg("8: (bd) if r2 <= r10 goto pc+3")
__msg("9: (35) if r1 >= 0xffe3fff8 goto pc+0")
__msg("10: (b5) if r2 <= 0x8 goto pc+0")
__msg("mark_precise: frame1: last_idx 10 first_idx 0 subseq_idx -1")
__msg("mark_precise: frame1: regs=r2 stack= before 9: (35) if r1 >= 0xffe3fff8 goto pc+0")
__msg("mark_precise: frame1: regs=r2 stack= before 8: (bd) if r2 <= r10 goto pc+3")
__msg("mark_precise: frame1: regs=r2 stack= before 7: (05) goto pc+0")
__naked void bpf_cond_op_r10(void)
{
asm volatile (
"r3 = 0 ll;"
"call __bpf_cond_op_r10;"
"r0 = 0;"
"exit;"
::: __clobber_all);
}
SEC("?raw_tp")
__success __log_level(2)
__msg("3: (bf) r3 = r10")
__msg("4: (bd) if r3 <= r2 goto pc+1")
__msg("5: (b5) if r2 <= 0x8 goto pc+2")
__msg("mark_precise: frame0: last_idx 5 first_idx 0 subseq_idx -1")
__msg("mark_precise: frame0: regs=r2 stack= before 4: (bd) if r3 <= r2 goto pc+1")
__msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r3 = r10")
__naked void bpf_cond_op_not_r10(void)
{
asm volatile (
"r0 = 0;"
"r2 = 2314885393468386424 ll;"
"r3 = r10;"
"if r3 <= r2 goto +1;"
"if r2 <= 8 goto +2;"
"r0 = 2 ll;"
"exit;"
::: __clobber_all);
}
SEC("lsm.s/socket_connect")
__success __log_level(2)
__msg("0: (b7) r0 = 1 ; R0_w=1")
__msg("1: (84) w0 = -w0 ; R0_w=0xffffffff")
__msg("mark_precise: frame0: last_idx 2 first_idx 0 subseq_idx -1")
__msg("mark_precise: frame0: regs=r0 stack= before 1: (84) w0 = -w0")
__msg("mark_precise: frame0: regs=r0 stack= before 0: (b7) r0 = 1")
__naked int bpf_neg_2(void)
{
/*
* lsm.s/socket_connect requires a return value within [-4095, 0].
* Returning -1 is allowed
*/
asm volatile (
"r0 = 1;"
"w0 = -w0;"
"exit;"
::: __clobber_all);
}
SEC("lsm.s/socket_connect")
__failure __msg("At program exit the register R0 has")
__naked int bpf_neg_3(void)
{
/*
* lsm.s/socket_connect requires a return value within [-4095, 0].
* Returning -10000 is not allowed.
*/
asm volatile (
"r0 = 10000;"
"w0 = -w0;"
"exit;"
::: __clobber_all);
}
SEC("lsm.s/socket_connect")
__success __log_level(2)
__msg("0: (b7) r0 = 1 ; R0_w=1")
__msg("1: (87) r0 = -r0 ; R0_w=-1")
__msg("mark_precise: frame0: last_idx 2 first_idx 0 subseq_idx -1")
__msg("mark_precise: frame0: regs=r0 stack= before 1: (87) r0 = -r0")
__msg("mark_precise: frame0: regs=r0 stack= before 0: (b7) r0 = 1")
__naked int bpf_neg_4(void)
{
/*
* lsm.s/socket_connect requires a return value within [-4095, 0].
* Returning -1 is allowed
*/
asm volatile (
"r0 = 1;"
"r0 = -r0;"
"exit;"
::: __clobber_all);
}
SEC("lsm.s/socket_connect")
__failure __msg("At program exit the register R0 has")
__naked int bpf_neg_5(void)
{
/*
* lsm.s/socket_connect requires a return value within [-4095, 0].
* Returning -10000 is not allowed.
*/
asm volatile (
"r0 = 10000;"
"r0 = -r0;"
"exit;"
::: __clobber_all);
}
char _license[] SEC("license") = "GPL";
|
