1 // SPDX-License-Identifier: GPL-2.0
2 /* Converted from tools/testing/selftests/bpf/verifier/bpf_get_stack.c */
3
4 #include <linux/bpf.h>
5 #include <bpf/bpf_helpers.h>
6 #include "bpf_misc.h"
7
8 #define MAX_ENTRIES 11
9
10 struct test_val {
11 unsigned int index;
12 int foo[MAX_ENTRIES];
13 };
14
15 struct {
16 __uint(type, BPF_MAP_TYPE_ARRAY);
17 __uint(max_entries, 1);
18 __type(key, int);
19 __type(value, struct test_val);
20 } map_array_48b SEC(".maps");
21
22 struct {
23 __uint(type, BPF_MAP_TYPE_HASH);
24 __uint(max_entries, 1);
25 __type(key, long long);
26 __type(value, struct test_val);
27 } map_hash_48b SEC(".maps");
28
29 SEC("tracepoint")
30 __description("bpf_get_stack return R0 within range")
31 __success
stack_return_r0_within_range(void)32 __naked void stack_return_r0_within_range(void)
33 {
34 asm volatile (" \
35 r6 = r1; \
36 r1 = 0; \
37 *(u64*)(r10 - 8) = r1; \
38 r2 = r10; \
39 r2 += -8; \
40 r1 = %[map_hash_48b] ll; \
41 call %[bpf_map_lookup_elem]; \
42 if r0 == 0 goto l0_%=; \
43 r7 = r0; \
44 r9 = %[__imm_0]; \
45 r1 = r6; \
46 r2 = r7; \
47 r3 = %[__imm_0]; \
48 r4 = 256; \
49 call %[bpf_get_stack]; \
50 r1 = 0; \
51 r8 = r0; \
52 r8 <<= 32; \
53 r8 s>>= 32; \
54 if r1 s> r8 goto l0_%=; \
55 r9 -= r8; \
56 r2 = r7; \
57 r2 += r8; \
58 r1 = r9; \
59 r1 <<= 32; \
60 r1 s>>= 32; \
61 r3 = r2; \
62 r3 += r1; \
63 r1 = r7; \
64 r5 = %[__imm_0]; \
65 r1 += r5; \
66 if r3 >= r1 goto l0_%=; \
67 r1 = r6; \
68 r3 = r9; \
69 r4 = 0; \
70 call %[bpf_get_stack]; \
71 l0_%=: exit; \
72 " :
73 : __imm(bpf_get_stack),
74 __imm(bpf_map_lookup_elem),
75 __imm_addr(map_hash_48b),
76 __imm_const(__imm_0, sizeof(struct test_val) / 2)
77 : __clobber_all);
78 }
79
80 SEC("iter/task")
81 __description("bpf_get_task_stack return R0 range is refined")
82 __success
return_r0_range_is_refined(void)83 __naked void return_r0_range_is_refined(void)
84 {
85 asm volatile (" \
86 r6 = *(u64*)(r1 + 0); \
87 r6 = *(u64*)(r6 + 0); /* ctx->meta->seq */\
88 r7 = *(u64*)(r1 + 8); /* ctx->task */\
89 r1 = %[map_array_48b] ll; /* fixup_map_array_48b */\
90 r2 = 0; \
91 *(u64*)(r10 - 8) = r2; \
92 r2 = r10; \
93 r2 += -8; \
94 call %[bpf_map_lookup_elem]; \
95 if r0 != 0 goto l0_%=; \
96 r0 = 0; \
97 exit; \
98 l0_%=: if r7 != 0 goto l1_%=; \
99 r0 = 0; \
100 exit; \
101 l1_%=: r1 = r7; \
102 r2 = r0; \
103 r9 = r0; /* keep buf for seq_write */\
104 r3 = 48; \
105 r4 = 0; \
106 call %[bpf_get_task_stack]; \
107 if r0 s> 0 goto l2_%=; \
108 r0 = 0; \
109 exit; \
110 l2_%=: r1 = r6; \
111 r2 = r9; \
112 r3 = r0; \
113 call %[bpf_seq_write]; \
114 r0 = 0; \
115 exit; \
116 " :
117 : __imm(bpf_get_task_stack),
118 __imm(bpf_map_lookup_elem),
119 __imm(bpf_seq_write),
120 __imm_addr(map_array_48b)
121 : __clobber_all);
122 }
123
124 char _license[] SEC("license") = "GPL";
125