159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/value.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_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("map element value store of cleared call register")
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__failure __msg("R1 !read_ok")
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__failure_unpriv __msg_unpriv("R1 !read_ok")
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__naked void store_of_cleared_call_register(void)
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{
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asm volatile (" \
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r2 = r10; \
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r2 += -8; \
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r1 = 0; \
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*(u64*)(r2 + 0) = r1; \
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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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*(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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: __clobber_all);
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}
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SEC("socket")
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__description("map element value with unaligned store")
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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 element_value_with_unaligned_store(void)
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{
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asm volatile (" \
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r2 = r10; \
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r2 += -8; \
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r1 = 0; \
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*(u64*)(r2 + 0) = r1; \
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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 += 3; \
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r1 = 42; \
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*(u64*)(r0 + 0) = r1; \
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r1 = 43; \
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*(u64*)(r0 + 2) = r1; \
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r1 = 44; \
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*(u64*)(r0 - 2) = r1; \
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r8 = r0; \
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r1 = 32; \
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*(u64*)(r8 + 0) = r1; \
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r1 = 33; \
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*(u64*)(r8 + 2) = r1; \
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r1 = 34; \
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*(u64*)(r8 - 2) = r1; \
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r8 += 5; \
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r1 = 22; \
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*(u64*)(r8 + 0) = r1; \
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r1 = 23; \
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*(u64*)(r8 + 4) = r1; \
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r1 = 24; \
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*(u64*)(r8 - 7) = r1; \
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r7 = r8; \
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r7 += 3; \
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r1 = 22; \
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*(u64*)(r7 + 0) = r1; \
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r1 = 23; \
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*(u64*)(r7 + 4) = r1; \
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r1 = 24; \
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*(u64*)(r7 - 4) = 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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: __clobber_all);
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}
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SEC("socket")
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__description("map element value with unaligned load")
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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 element_value_with_unaligned_load(void)
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{
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asm volatile (" \
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r2 = r10; \
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r2 += -8; \
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r1 = 0; \
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*(u64*)(r2 + 0) = r1; \
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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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r0 += 3; \
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r7 = *(u64*)(r0 + 0); \
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r7 = *(u64*)(r0 + 2); \
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r8 = r0; \
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r7 = *(u64*)(r8 + 0); \
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r7 = *(u64*)(r8 + 2); \
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r0 += 5; \
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r7 = *(u64*)(r0 + 0); \
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r7 = *(u64*)(r0 + 4); \
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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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: __clobber_all);
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}
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SEC("socket")
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__description("map element value is preserved across register spilling")
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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 is_preserved_across_register_spilling(void)
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{
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asm volatile (" \
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r2 = r10; \
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r2 += -8; \
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r1 = 0; \
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*(u64*)(r2 + 0) = r1; \
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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 += %[test_val_foo]; \
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r1 = 42; \
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*(u64*)(r0 + 0) = r1; \
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r1 = r10; \
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r1 += -184; \
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*(u64*)(r1 + 0) = r0; \
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r3 = *(u64*)(r1 + 0); \
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r1 = 42; \
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*(u64*)(r3 + 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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char _license[] SEC("license") = "GPL";
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