| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* Converted from tools/testing/selftests/bpf/verifier/and.c */ |
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| 3 | |
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| 4 | #include <linux/bpf.h> |
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| 5 | #include <bpf/bpf_helpers.h> |
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| 6 | #include "bpf_misc.h" |
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| 7 | |
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| 8 | #define MAX_ENTRIES 11 |
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| 9 | |
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| 10 | struct test_val { |
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| 11 | unsigned int index; |
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| 12 | int foo[MAX_ENTRIES]; |
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| 13 | }; |
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| 14 | |
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| 15 | struct { |
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| 16 | __uint(type, BPF_MAP_TYPE_HASH); |
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| 17 | __uint(max_entries, 1); |
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| 18 | __type(key, long long); |
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| 19 | __type(value, struct test_val); |
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| 20 | } map_hash_48b SEC(".maps" ); |
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| 21 | |
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| 22 | SEC("socket" ) |
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| 23 | __description("invalid and of negative number" ) |
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| 24 | __failure __msg("R0 max value is outside of the allowed memory range" ) |
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| 25 | __failure_unpriv |
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| 26 | __flag(BPF_F_ANY_ALIGNMENT) |
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| 27 | __naked void invalid_and_of_negative_number(void) |
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| 28 | { |
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| 29 | asm volatile (" \ |
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| 30 | r1 = 0; \ |
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| 31 | *(u64*)(r10 - 8) = r1; \ |
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| 32 | r2 = r10; \ |
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| 33 | r2 += -8; \ |
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| 34 | r1 = %[map_hash_48b] ll; \ |
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| 35 | call %[bpf_map_lookup_elem]; \ |
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| 36 | if r0 == 0 goto l0_%=; \ |
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| 37 | r1 = *(u8*)(r0 + 0); \ |
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| 38 | r1 &= -4; \ |
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| 39 | r1 <<= 2; \ |
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| 40 | r0 += r1; \ |
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| 41 | l0_%=: r1 = %[test_val_foo]; \ |
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| 42 | *(u64*)(r0 + 0) = r1; \ |
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| 43 | exit; \ |
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| 44 | " : |
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| 45 | : __imm(bpf_map_lookup_elem), |
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| 46 | __imm_addr(map_hash_48b), |
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| 47 | __imm_const(test_val_foo, offsetof(struct test_val, foo)) |
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| 48 | : __clobber_all); |
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| 49 | } |
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| 50 | |
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| 51 | SEC("socket" ) |
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| 52 | __description("invalid range check" ) |
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| 53 | __failure __msg("R0 max value is outside of the allowed memory range" ) |
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| 54 | __failure_unpriv |
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| 55 | __flag(BPF_F_ANY_ALIGNMENT) |
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| 56 | __naked void invalid_range_check(void) |
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| 57 | { |
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| 58 | asm volatile (" \ |
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| 59 | r1 = 0; \ |
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| 60 | *(u64*)(r10 - 8) = r1; \ |
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| 61 | r2 = r10; \ |
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| 62 | r2 += -8; \ |
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| 63 | r1 = %[map_hash_48b] ll; \ |
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| 64 | call %[bpf_map_lookup_elem]; \ |
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| 65 | if r0 == 0 goto l0_%=; \ |
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| 66 | r1 = *(u32*)(r0 + 0); \ |
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| 67 | r9 = 1; \ |
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| 68 | w1 %%= 2; \ |
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| 69 | w1 += 1; \ |
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| 70 | w9 &= w1; \ |
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| 71 | w9 += 1; \ |
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| 72 | w9 >>= 1; \ |
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| 73 | w3 = 1; \ |
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| 74 | w3 -= w9; \ |
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| 75 | w3 *= 0x10000000; \ |
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| 76 | r0 += r3; \ |
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| 77 | *(u32*)(r0 + 0) = r3; \ |
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| 78 | l0_%=: r0 = r0; \ |
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| 79 | exit; \ |
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| 80 | " : |
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| 81 | : __imm(bpf_map_lookup_elem), |
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| 82 | __imm_addr(map_hash_48b) |
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| 83 | : __clobber_all); |
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| 84 | } |
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| 85 | |
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| 86 | SEC("socket" ) |
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| 87 | __description("check known subreg with unknown reg" ) |
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| 88 | __success __failure_unpriv __msg_unpriv("R1 !read_ok" ) |
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| 89 | __retval(0) |
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| 90 | __naked void known_subreg_with_unknown_reg(void) |
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| 91 | { |
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| 92 | asm volatile (" \ |
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| 93 | call %[bpf_get_prandom_u32]; \ |
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| 94 | r0 <<= 32; \ |
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| 95 | r0 += 1; \ |
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| 96 | r0 &= 0xFFFF1234; \ |
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| 97 | /* Upper bits are unknown but AND above masks out 1 zero'ing lower bits */\ |
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| 98 | if w0 < 1 goto l0_%=; \ |
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| 99 | r1 = *(u32*)(r1 + 512); \ |
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| 100 | l0_%=: r0 = 0; \ |
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| 101 | exit; \ |
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| 102 | " : |
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| 103 | : __imm(bpf_get_prandom_u32) |
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| 104 | : __clobber_all); |
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| 105 | } |
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| 106 | |
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| 107 | char _license[] SEC("license" ) = "GPL" ; |
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| 108 | |
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