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Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2/* Converted from tools/testing/selftests/bpf/verifier/and.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
10struct test_val {
11 unsigned int index;
12 int foo[MAX_ENTRIES];
13};
14
15struct {
16 __uint(type, BPF_MAP_TYPE_HASH);
17 __uint(max_entries, 1);
18 __type(key, long long);
19 __type(value, struct test_val);
20} map_hash_48b SEC(".maps");
21
22SEC("socket")
23__description("invalid and of negative number")
24__failure __msg("R0 max value is outside of the allowed memory range")
25__failure_unpriv
26__flag(BPF_F_ANY_ALIGNMENT)
27__naked void invalid_and_of_negative_number(void)
28{
29 asm volatile (" \
30 r1 = 0; \
31 *(u64*)(r10 - 8) = r1; \
32 r2 = r10; \
33 r2 += -8; \
34 r1 = %[map_hash_48b] ll; \
35 call %[bpf_map_lookup_elem]; \
36 if r0 == 0 goto l0_%=; \
37 r1 = *(u8*)(r0 + 0); \
38 r1 &= -4; \
39 r1 <<= 2; \
40 r0 += r1; \
41l0_%=: r1 = %[test_val_foo]; \
42 *(u64*)(r0 + 0) = r1; \
43 exit; \
44" :
45 : __imm(bpf_map_lookup_elem),
46 __imm_addr(map_hash_48b),
47 __imm_const(test_val_foo, offsetof(struct test_val, foo))
48 : __clobber_all);
49}
50
51SEC("socket")
52__description("invalid range check")
53__failure __msg("R0 max value is outside of the allowed memory range")
54__failure_unpriv
55__flag(BPF_F_ANY_ALIGNMENT)
56__naked void invalid_range_check(void)
57{
58 asm volatile (" \
59 r1 = 0; \
60 *(u64*)(r10 - 8) = r1; \
61 r2 = r10; \
62 r2 += -8; \
63 r1 = %[map_hash_48b] ll; \
64 call %[bpf_map_lookup_elem]; \
65 if r0 == 0 goto l0_%=; \
66 r1 = *(u32*)(r0 + 0); \
67 r9 = 1; \
68 w1 %%= 2; \
69 w1 += 1; \
70 w9 &= w1; \
71 w9 += 1; \
72 w9 >>= 1; \
73 w3 = 1; \
74 w3 -= w9; \
75 w3 *= 0x10000000; \
76 r0 += r3; \
77 *(u32*)(r0 + 0) = r3; \
78l0_%=: r0 = r0; \
79 exit; \
80" :
81 : __imm(bpf_map_lookup_elem),
82 __imm_addr(map_hash_48b)
83 : __clobber_all);
84}
85
86SEC("socket")
87__description("check known subreg with unknown reg")
88__success __success_unpriv
89__retval(0)
90#ifdef SPEC_V1
91__xlated_unpriv("if w0 < 0x1 goto pc+2")
92__xlated_unpriv("nospec") /* inserted to prevent `R1 !read_ok'` */
93__xlated_unpriv("goto pc-1") /* `r1 = *(u32*)(r1 + 512)`, sanitized dead code */
94__xlated_unpriv("r0 = 0")
95#endif
96__naked void known_subreg_with_unknown_reg(void)
97{
98 asm volatile (" \
99 call %[bpf_get_prandom_u32]; \
100 r0 <<= 32; \
101 r0 += 1; \
102 r0 &= 0xFFFF1234; \
103 /* Upper bits are unknown but AND above masks out 1 zero'ing lower bits */\
104 if w0 < 1 goto l0_%=; \
105 r1 = *(u32*)(r1 + 512); \
106l0_%=: r0 = 0; \
107 exit; \
108" :
109 : __imm(bpf_get_prandom_u32)
110 : __clobber_all);
111}
112
113char _license[] SEC("license") = "GPL";