530 lines
13 KiB
C
530 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/array_access.c */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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#define MAX_ENTRIES 11
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struct test_val {
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unsigned int index;
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int foo[MAX_ENTRIES];
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};
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, struct test_val);
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__uint(map_flags, BPF_F_RDONLY_PROG);
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} map_array_ro SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, struct test_val);
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__uint(map_flags, BPF_F_WRONLY_PROG);
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} map_array_wo SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, 1);
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__type(key, long long);
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__type(value, struct test_val);
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} map_hash_48b SEC(".maps");
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SEC("socket")
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__description("valid map access into an array with a constant")
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__success __failure_unpriv __msg_unpriv("R0 leaks addr")
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__retval(0)
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__naked void an_array_with_a_constant_1(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("valid map access into an array with a register")
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__success __failure_unpriv __msg_unpriv("R0 leaks addr")
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__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
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__naked void an_array_with_a_register_1(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = 4; \
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r1 <<= 2; \
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r0 += r1; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("valid map access into an array with a variable")
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__success __failure_unpriv __msg_unpriv("R0 leaks addr")
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__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
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__naked void an_array_with_a_variable_1(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = *(u32*)(r0 + 0); \
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if r1 >= %[max_entries] goto l0_%=; \
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r1 <<= 2; \
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r0 += r1; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(max_entries, MAX_ENTRIES),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("valid map access into an array with a signed variable")
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__success __failure_unpriv __msg_unpriv("R0 leaks addr")
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__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
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__naked void array_with_a_signed_variable(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = *(u32*)(r0 + 0); \
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if w1 s> 0xffffffff goto l1_%=; \
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w1 = 0; \
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l1_%=: w2 = %[max_entries]; \
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if r2 s> r1 goto l2_%=; \
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w1 = 0; \
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l2_%=: w1 <<= 2; \
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r0 += r1; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(max_entries, MAX_ENTRIES),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("invalid map access into an array with a constant")
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__failure __msg("invalid access to map value, value_size=48 off=48 size=8")
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__failure_unpriv
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__naked void an_array_with_a_constant_2(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + %[__imm_0]) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(__imm_0, (MAX_ENTRIES + 1) << 2),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("invalid map access into an array with a register")
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__failure __msg("R0 min value is outside of the allowed memory range")
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__failure_unpriv
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void an_array_with_a_register_2(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = %[__imm_0]; \
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r1 <<= 2; \
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r0 += r1; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(__imm_0, MAX_ENTRIES + 1),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("invalid map access into an array with a variable")
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__failure
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__msg("R0 unbounded memory access, make sure to bounds check any such access")
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__failure_unpriv
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void an_array_with_a_variable_2(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = *(u32*)(r0 + 0); \
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r1 <<= 2; \
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r0 += r1; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("invalid map access into an array with no floor check")
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__failure __msg("R0 unbounded memory access")
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__failure_unpriv __msg_unpriv("R0 leaks addr")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void array_with_no_floor_check(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = *(u64*)(r0 + 0); \
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w2 = %[max_entries]; \
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if r2 s> r1 goto l1_%=; \
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w1 = 0; \
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l1_%=: w1 <<= 2; \
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r0 += r1; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(max_entries, MAX_ENTRIES),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("invalid map access into an array with a invalid max check")
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__failure __msg("invalid access to map value, value_size=48 off=44 size=8")
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__failure_unpriv __msg_unpriv("R0 leaks addr")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void with_a_invalid_max_check_1(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = *(u32*)(r0 + 0); \
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w2 = %[__imm_0]; \
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if r2 > r1 goto l1_%=; \
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w1 = 0; \
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l1_%=: w1 <<= 2; \
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r0 += r1; \
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r1 = %[test_val_foo]; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(__imm_0, MAX_ENTRIES + 1),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("invalid map access into an array with a invalid max check")
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__failure __msg("R0 pointer += pointer")
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__failure_unpriv
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void with_a_invalid_max_check_2(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r8 = r0; \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r0 += r8; \
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r0 = *(u32*)(r0 + %[test_val_foo]); \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_48b),
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__imm_const(test_val_foo, offsetof(struct test_val, foo))
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: __clobber_all);
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}
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SEC("socket")
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__description("valid read map access into a read-only array 1")
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__success __success_unpriv __retval(28)
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__naked void a_read_only_array_1_1(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_ro] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r0 = *(u32*)(r0 + 0); \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_array_ro)
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: __clobber_all);
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}
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SEC("tc")
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__description("valid read map access into a read-only array 2")
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__success __retval(65507)
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__naked void a_read_only_array_2_1(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_ro] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = r0; \
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r2 = 4; \
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r3 = 0; \
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r4 = 0; \
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r5 = 0; \
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call %[bpf_csum_diff]; \
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l0_%=: r0 &= 0xffff; \
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exit; \
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" :
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: __imm(bpf_csum_diff),
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__imm(bpf_map_lookup_elem),
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__imm_addr(map_array_ro)
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: __clobber_all);
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}
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SEC("socket")
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__description("invalid write map access into a read-only array 1")
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__failure __msg("write into map forbidden")
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__failure_unpriv
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__naked void a_read_only_array_1_2(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_ro] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = 42; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_array_ro)
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: __clobber_all);
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}
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SEC("tc")
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__description("invalid write map access into a read-only array 2")
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__failure __msg("write into map forbidden")
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__naked void a_read_only_array_2_2(void)
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{
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asm volatile (" \
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r6 = r1; \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_ro] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = r6; \
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r2 = 0; \
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r3 = r0; \
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r4 = 8; \
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call %[bpf_skb_load_bytes]; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm(bpf_skb_load_bytes),
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__imm_addr(map_array_ro)
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: __clobber_all);
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}
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SEC("socket")
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__description("valid write map access into a write-only array 1")
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__success __success_unpriv __retval(1)
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__naked void a_write_only_array_1_1(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_wo] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = 42; \
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*(u64*)(r0 + 0) = r1; \
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l0_%=: r0 = 1; \
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exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_array_wo)
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: __clobber_all);
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}
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SEC("tc")
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__description("valid write map access into a write-only array 2")
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__success __retval(0)
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__naked void a_write_only_array_2_1(void)
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{
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asm volatile (" \
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r6 = r1; \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_wo] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = r6; \
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r2 = 0; \
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r3 = r0; \
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r4 = 8; \
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call %[bpf_skb_load_bytes]; \
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l0_%=: exit; \
|
|
" :
|
|
: __imm(bpf_map_lookup_elem),
|
|
__imm(bpf_skb_load_bytes),
|
|
__imm_addr(map_array_wo)
|
|
: __clobber_all);
|
|
}
|
|
|
|
SEC("socket")
|
|
__description("invalid read map access into a write-only array 1")
|
|
__failure __msg("read from map forbidden")
|
|
__failure_unpriv
|
|
__naked void a_write_only_array_1_2(void)
|
|
{
|
|
asm volatile (" \
|
|
r1 = 0; \
|
|
*(u64*)(r10 - 8) = r1; \
|
|
r2 = r10; \
|
|
r2 += -8; \
|
|
r1 = %[map_array_wo] ll; \
|
|
call %[bpf_map_lookup_elem]; \
|
|
if r0 == 0 goto l0_%=; \
|
|
r0 = *(u64*)(r0 + 0); \
|
|
l0_%=: exit; \
|
|
" :
|
|
: __imm(bpf_map_lookup_elem),
|
|
__imm_addr(map_array_wo)
|
|
: __clobber_all);
|
|
}
|
|
|
|
SEC("tc")
|
|
__description("invalid read map access into a write-only array 2")
|
|
__failure __msg("read from map forbidden")
|
|
__naked void a_write_only_array_2_2(void)
|
|
{
|
|
asm volatile (" \
|
|
r1 = 0; \
|
|
*(u64*)(r10 - 8) = r1; \
|
|
r2 = r10; \
|
|
r2 += -8; \
|
|
r1 = %[map_array_wo] ll; \
|
|
call %[bpf_map_lookup_elem]; \
|
|
if r0 == 0 goto l0_%=; \
|
|
r1 = r0; \
|
|
r2 = 4; \
|
|
r3 = 0; \
|
|
r4 = 0; \
|
|
r5 = 0; \
|
|
call %[bpf_csum_diff]; \
|
|
l0_%=: exit; \
|
|
" :
|
|
: __imm(bpf_csum_diff),
|
|
__imm(bpf_map_lookup_elem),
|
|
__imm_addr(map_array_wo)
|
|
: __clobber_all);
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|