| 1 | |
| 2 |
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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 | SEC("socket")
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| 9 | __description("raw_stack: no skb_load_bytes")
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| 10 | __success
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| 11 | __failure_unpriv __msg_unpriv("invalid read from stack R6 off=-8 size=8")
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| 12 | __naked void stack_no_skb_load_bytes(void)
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| 13 | {
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| 14 | asm volatile (" \
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| 15 | r2 = 4; \
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| 16 | r6 = r10; \
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| 17 | r6 += -8; \
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| 18 | r3 = r6; \
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| 19 | r4 = 8; \
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| 20 | /* Call to skb_load_bytes() omitted. */ \
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| 21 | r0 = *(u64*)(r6 + 0); \
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| 22 | exit; \
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| 23 | " ::: __clobber_all);
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| 24 | }
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| 25 |
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| 26 | SEC("tc")
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| 27 | __description("raw_stack: skb_load_bytes, negative len")
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| 28 | __failure __msg("R4 min value is negative")
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| 29 | __naked void skb_load_bytes_negative_len(void)
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| 30 | {
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| 31 | asm volatile (" \
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| 32 | r2 = 4; \
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| 33 | r6 = r10; \
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| 34 | r6 += -8; \
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| 35 | r3 = r6; \
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| 36 | r4 = -8; \
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| 37 | call %[bpf_skb_load_bytes]; \
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| 38 | r0 = *(u64*)(r6 + 0); \
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| 39 | exit; \
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| 40 | " :
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| 41 | : __imm(bpf_skb_load_bytes)
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| 42 | : __clobber_all);
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| 43 | }
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| 44 |
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| 45 | SEC("tc")
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| 46 | __description("raw_stack: skb_load_bytes, negative len 2")
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| 47 | __failure __msg("R4 min value is negative")
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| 48 | __naked void load_bytes_negative_len_2(void)
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| 49 | {
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| 50 | asm volatile (" \
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| 51 | r2 = 4; \
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| 52 | r6 = r10; \
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| 53 | r6 += -8; \
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| 54 | r3 = r6; \
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| 55 | r4 = %[__imm_0]; \
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| 56 | call %[bpf_skb_load_bytes]; \
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| 57 | r0 = *(u64*)(r6 + 0); \
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| 58 | exit; \
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| 59 | " :
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| 60 | : __imm(bpf_skb_load_bytes),
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| 61 | __imm_const(__imm_0, ~0)
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| 62 | : __clobber_all);
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| 63 | }
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| 64 |
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| 65 | SEC("tc")
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| 66 | __description("raw_stack: skb_load_bytes, zero len")
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| 67 | __failure __msg("R4 invalid zero-sized read: u64=[0,0]")
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| 68 | __naked void skb_load_bytes_zero_len(void)
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| 69 | {
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| 70 | asm volatile (" \
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| 71 | r2 = 4; \
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| 72 | r6 = r10; \
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| 73 | r6 += -8; \
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| 74 | r3 = r6; \
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| 75 | r4 = 0; \
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| 76 | call %[bpf_skb_load_bytes]; \
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| 77 | r0 = *(u64*)(r6 + 0); \
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| 78 | exit; \
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| 79 | " :
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| 80 | : __imm(bpf_skb_load_bytes)
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| 81 | : __clobber_all);
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| 82 | }
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| 83 |
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| 84 | SEC("tc")
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| 85 | __description("raw_stack: skb_load_bytes, no init")
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| 86 | __success __retval(0)
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| 87 | __naked void skb_load_bytes_no_init(void)
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| 88 | {
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| 89 | asm volatile (" \
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| 90 | r2 = 4; \
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| 91 | r6 = r10; \
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| 92 | r6 += -8; \
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| 93 | r3 = r6; \
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| 94 | r4 = 8; \
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| 95 | call %[bpf_skb_load_bytes]; \
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| 96 | r0 = *(u64*)(r6 + 0); \
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| 97 | exit; \
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| 98 | " :
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| 99 | : __imm(bpf_skb_load_bytes)
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| 100 | : __clobber_all);
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| 101 | }
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| 102 |
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| 103 | SEC("tc")
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| 104 | __description("raw_stack: skb_load_bytes, init")
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| 105 | __success __retval(0)
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| 106 | __naked void stack_skb_load_bytes_init(void)
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| 107 | {
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| 108 | asm volatile (" \
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| 109 | r2 = 4; \
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| 110 | r6 = r10; \
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| 111 | r6 += -8; \
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| 112 | r3 = 0xcafe; \
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| 113 | *(u64*)(r6 + 0) = r3; \
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| 114 | r3 = r6; \
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| 115 | r4 = 8; \
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| 116 | call %[bpf_skb_load_bytes]; \
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| 117 | r0 = *(u64*)(r6 + 0); \
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| 118 | exit; \
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| 119 | " :
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| 120 | : __imm(bpf_skb_load_bytes)
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| 121 | : __clobber_all);
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| 122 | }
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| 123 |
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| 124 | SEC("tc")
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| 125 | __description("raw_stack: skb_load_bytes, spilled regs around bounds")
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| 126 | __success __retval(0)
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| 127 | __naked void bytes_spilled_regs_around_bounds(void)
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| 128 | {
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| 129 | asm volatile (" \
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| 130 | r2 = 4; \
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| 131 | r6 = r10; \
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| 132 | r6 += -16; \
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| 133 | *(u64*)(r6 - 8) = r1; \
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| 134 | *(u64*)(r6 + 8) = r1; \
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| 135 | r3 = r6; \
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| 136 | r4 = 8; \
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| 137 | call %[bpf_skb_load_bytes]; \
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| 138 | r0 = *(u64*)(r6 - 8); \
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| 139 | r2 = *(u64*)(r6 + 8); \
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| 140 | r0 = *(u32*)(r0 + %[__sk_buff_mark]); \
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| 141 | r2 = *(u32*)(r2 + %[__sk_buff_priority]); \
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| 142 | r0 += r2; \
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| 143 | exit; \
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| 144 | " :
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| 145 | : __imm(bpf_skb_load_bytes),
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| 146 | __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark)),
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| 147 | __imm_const(__sk_buff_priority, offsetof(struct __sk_buff, priority))
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| 148 | : __clobber_all);
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| 149 | }
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| 150 |
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| 151 | SEC("tc")
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| 152 | __description("raw_stack: skb_load_bytes, spilled regs corruption")
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| 153 | __failure __msg("R0 invalid mem access 'scalar'")
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| 154 | __flag(BPF_F_ANY_ALIGNMENT)
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| 155 | __naked void load_bytes_spilled_regs_corruption(void)
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| 156 | {
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| 157 | asm volatile (" \
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| 158 | r2 = 4; \
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| 159 | r6 = r10; \
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| 160 | r6 += -8; \
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| 161 | *(u64*)(r6 + 0) = r1; \
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| 162 | r3 = r6; \
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| 163 | r4 = 8; \
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| 164 | call %[bpf_skb_load_bytes]; \
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| 165 | r0 = *(u64*)(r6 + 0); \
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| 166 | r0 = *(u32*)(r0 + %[__sk_buff_mark]); \
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| 167 | exit; \
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| 168 | " :
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| 169 | : __imm(bpf_skb_load_bytes),
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| 170 | __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
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| 171 | : __clobber_all);
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| 172 | }
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| 173 |
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| 174 | SEC("tc")
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| 175 | __description("raw_stack: skb_load_bytes, spilled regs corruption 2")
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| 176 | __failure __msg("R3 invalid mem access 'scalar'")
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| 177 | __flag(BPF_F_ANY_ALIGNMENT)
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| 178 | __naked void bytes_spilled_regs_corruption_2(void)
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| 179 | {
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| 180 | asm volatile (" \
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| 181 | r2 = 4; \
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| 182 | r6 = r10; \
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| 183 | r6 += -16; \
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| 184 | *(u64*)(r6 - 8) = r1; \
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| 185 | *(u64*)(r6 + 0) = r1; \
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| 186 | *(u64*)(r6 + 8) = r1; \
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| 187 | r3 = r6; \
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| 188 | r4 = 8; \
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| 189 | call %[bpf_skb_load_bytes]; \
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| 190 | r0 = *(u64*)(r6 - 8); \
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| 191 | r2 = *(u64*)(r6 + 8); \
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| 192 | r3 = *(u64*)(r6 + 0); \
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| 193 | r0 = *(u32*)(r0 + %[__sk_buff_mark]); \
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| 194 | r2 = *(u32*)(r2 + %[__sk_buff_priority]); \
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| 195 | r0 += r2; \
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| 196 | r3 = *(u32*)(r3 + %[__sk_buff_pkt_type]); \
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| 197 | r0 += r3; \
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| 198 | exit; \
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| 199 | " :
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| 200 | : __imm(bpf_skb_load_bytes),
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| 201 | __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark)),
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| 202 | __imm_const(__sk_buff_pkt_type, offsetof(struct __sk_buff, pkt_type)),
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| 203 | __imm_const(__sk_buff_priority, offsetof(struct __sk_buff, priority))
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| 204 | : __clobber_all);
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| 205 | }
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| 206 |
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| 207 | SEC("tc")
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| 208 | __description("raw_stack: skb_load_bytes, spilled regs + data")
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| 209 | __success __retval(0)
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| 210 | __naked void load_bytes_spilled_regs_data(void)
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| 211 | {
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| 212 | asm volatile (" \
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| 213 | r2 = 4; \
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| 214 | r6 = r10; \
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| 215 | r6 += -16; \
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| 216 | *(u64*)(r6 - 8) = r1; \
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| 217 | *(u64*)(r6 + 0) = r1; \
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| 218 | *(u64*)(r6 + 8) = r1; \
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| 219 | r3 = r6; \
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| 220 | r4 = 8; \
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| 221 | call %[bpf_skb_load_bytes]; \
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| 222 | r0 = *(u64*)(r6 - 8); \
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| 223 | r2 = *(u64*)(r6 + 8); \
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| 224 | r3 = *(u64*)(r6 + 0); \
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| 225 | r0 = *(u32*)(r0 + %[__sk_buff_mark]); \
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| 226 | r2 = *(u32*)(r2 + %[__sk_buff_priority]); \
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| 227 | r0 += r2; \
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| 228 | r0 += r3; \
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| 229 | exit; \
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| 230 | " :
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| 231 | : __imm(bpf_skb_load_bytes),
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| 232 | __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark)),
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| 233 | __imm_const(__sk_buff_priority, offsetof(struct __sk_buff, priority))
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| 234 | : __clobber_all);
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| 235 | }
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| 236 |
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| 237 | SEC("tc")
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| 238 | __description("raw_stack: skb_load_bytes, invalid access 1")
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| 239 | __failure __msg("invalid write to stack R3 off=-513 size=8")
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| 240 | __naked void load_bytes_invalid_access_1(void)
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| 241 | {
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| 242 | asm volatile (" \
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| 243 | r2 = 4; \
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| 244 | r6 = r10; \
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| 245 | r6 += -513; \
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| 246 | r3 = r6; \
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| 247 | r4 = 8; \
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| 248 | call %[bpf_skb_load_bytes]; \
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| 249 | r0 = *(u64*)(r6 + 0); \
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| 250 | exit; \
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| 251 | " :
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| 252 | : __imm(bpf_skb_load_bytes)
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| 253 | : __clobber_all);
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| 254 | }
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| 255 |
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| 256 | SEC("tc")
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| 257 | __description("raw_stack: skb_load_bytes, invalid access 2")
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| 258 | __failure __msg("invalid write to stack R3 off=-1 size=8")
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| 259 | __naked void load_bytes_invalid_access_2(void)
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| 260 | {
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| 261 | asm volatile (" \
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| 262 | r2 = 4; \
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| 263 | r6 = r10; \
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| 264 | r6 += -1; \
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| 265 | r3 = r6; \
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| 266 | r4 = 8; \
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| 267 | call %[bpf_skb_load_bytes]; \
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| 268 | r0 = *(u64*)(r6 + 0); \
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| 269 | exit; \
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| 270 | " :
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| 271 | : __imm(bpf_skb_load_bytes)
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| 272 | : __clobber_all);
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| 273 | }
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| 274 |
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| 275 | SEC("tc")
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| 276 | __description("raw_stack: skb_load_bytes, invalid access 3")
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| 277 | __failure __msg("R4 min value is negative")
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| 278 | __naked void load_bytes_invalid_access_3(void)
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| 279 | {
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| 280 | asm volatile (" \
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| 281 | r2 = 4; \
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| 282 | r6 = r10; \
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| 283 | r6 += 0xffffffff; \
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| 284 | r3 = r6; \
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| 285 | r4 = 0xffffffff; \
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| 286 | call %[bpf_skb_load_bytes]; \
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| 287 | r0 = *(u64*)(r6 + 0); \
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| 288 | exit; \
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| 289 | " :
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| 290 | : __imm(bpf_skb_load_bytes)
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| 291 | : __clobber_all);
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| 292 | }
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| 293 |
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| 294 | SEC("tc")
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| 295 | __description("raw_stack: skb_load_bytes, invalid access 4")
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| 296 | __failure
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| 297 | __msg("R4 unbounded memory access, use 'var &= const' or 'if (var < const)'")
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| 298 | __naked void load_bytes_invalid_access_4(void)
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| 299 | {
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| 300 | asm volatile (" \
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| 301 | r2 = 4; \
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| 302 | r6 = r10; \
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| 303 | r6 += -1; \
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| 304 | r3 = r6; \
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| 305 | r4 = 0x7fffffff; \
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| 306 | call %[bpf_skb_load_bytes]; \
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| 307 | r0 = *(u64*)(r6 + 0); \
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| 308 | exit; \
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| 309 | " :
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| 310 | : __imm(bpf_skb_load_bytes)
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| 311 | : __clobber_all);
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| 312 | }
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| 313 |
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| 314 | SEC("tc")
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| 315 | __description("raw_stack: skb_load_bytes, invalid access 5")
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| 316 | __failure
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| 317 | __msg("R4 unbounded memory access, use 'var &= const' or 'if (var < const)'")
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| 318 | __naked void load_bytes_invalid_access_5(void)
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| 319 | {
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| 320 | asm volatile (" \
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| 321 | r2 = 4; \
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| 322 | r6 = r10; \
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| 323 | r6 += -512; \
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| 324 | r3 = r6; \
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| 325 | r4 = 0x7fffffff; \
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| 326 | call %[bpf_skb_load_bytes]; \
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| 327 | r0 = *(u64*)(r6 + 0); \
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| 328 | exit; \
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| 329 | " :
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| 330 | : __imm(bpf_skb_load_bytes)
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| 331 | : __clobber_all);
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| 332 | }
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| 333 |
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| 334 | SEC("tc")
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| 335 | __description("raw_stack: skb_load_bytes, invalid access 6")
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| 336 | __failure __msg("invalid zero-sized read")
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| 337 | __naked void load_bytes_invalid_access_6(void)
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| 338 | {
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| 339 | asm volatile (" \
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| 340 | r2 = 4; \
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| 341 | r6 = r10; \
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| 342 | r6 += -512; \
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| 343 | r3 = r6; \
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| 344 | r4 = 0; \
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| 345 | call %[bpf_skb_load_bytes]; \
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| 346 | r0 = *(u64*)(r6 + 0); \
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| 347 | exit; \
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| 348 | " :
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| 349 | : __imm(bpf_skb_load_bytes)
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| 350 | : __clobber_all);
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| 351 | }
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| 352 |
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| 353 | SEC("tc")
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| 354 | __description("raw_stack: skb_load_bytes, large access")
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| 355 | __success __retval(0)
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| 356 | __naked void skb_load_bytes_large_access(void)
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| 357 | {
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| 358 | asm volatile (" \
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| 359 | r2 = 4; \
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| 360 | r6 = r10; \
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| 361 | r6 += -512; \
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| 362 | r3 = r6; \
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| 363 | r4 = 512; \
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| 364 | call %[bpf_skb_load_bytes]; \
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| 365 | r0 = *(u64*)(r6 + 0); \
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| 366 | exit; \
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| 367 | " :
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| 368 | : __imm(bpf_skb_load_bytes)
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| 369 | : __clobber_all);
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| 370 | }
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| 371 |
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| 372 | char _license[] SEC("license") = "GPL";
|