160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/map_ptr.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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} map_array_48b SEC(".maps");
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struct other_val {
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long long foo;
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long long bar;
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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 other_val);
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} map_hash_16b SEC(".maps");
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SEC("socket")
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__description("bpf_map_ptr: read with negative offset rejected")
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__failure __msg("R1 is bpf_array invalid negative access: off=-8")
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__failure_unpriv
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__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
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__naked void read_with_negative_offset_rejected(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 = %[map_array_48b] ll; \
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r6 = *(u64*)(r1 - 8); \
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r0 = 1; \
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exit; \
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" :
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: __imm_addr(map_array_48b)
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: __clobber_all);
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}
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SEC("socket")
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__description("bpf_map_ptr: write rejected")
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__failure __msg("only read from bpf_array is supported")
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__failure_unpriv
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__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
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__naked void bpf_map_ptr_write_rejected(void)
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{
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asm volatile (" \
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r0 = 0; \
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*(u64*)(r10 - 8) = r0; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_48b] ll; \
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*(u64*)(r1 + 0) = r2; \
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r0 = 1; \
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exit; \
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" :
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: __imm_addr(map_array_48b)
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: __clobber_all);
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}
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SEC("socket")
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__description("bpf_map_ptr: read non-existent field rejected")
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__failure
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__msg("cannot access ptr member ops with moff 0 in struct bpf_map with off 1 size 4")
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__failure_unpriv
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__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void read_non_existent_field_rejected(void)
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{
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asm volatile (" \
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r6 = 0; \
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r1 = %[map_array_48b] ll; \
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r6 = *(u32*)(r1 + 1); \
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r0 = 1; \
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exit; \
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" :
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: __imm_addr(map_array_48b)
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: __clobber_all);
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}
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SEC("socket")
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__description("bpf_map_ptr: read ops field accepted")
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__success __failure_unpriv
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__msg_unpriv("access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN")
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__retval(1)
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__naked void ptr_read_ops_field_accepted(void)
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{
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asm volatile (" \
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r6 = 0; \
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r1 = %[map_array_48b] ll; \
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r6 = *(u64*)(r1 + 0); \
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r0 = 1; \
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exit; \
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" :
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: __imm_addr(map_array_48b)
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: __clobber_all);
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}
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SEC("socket")
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__description("bpf_map_ptr: r = 0, map_ptr = map_ptr + r")
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__success __failure_unpriv
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__msg_unpriv("R1 has pointer with unsupported alu operation")
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__retval(0)
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__naked void map_ptr_map_ptr_r(void)
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{
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asm volatile (" \
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r0 = 0; \
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*(u64*)(r10 - 8) = r0; \
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r2 = r10; \
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r2 += -8; \
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r0 = 0; \
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r1 = %[map_hash_16b] ll; \
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r1 += r0; \
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call %[bpf_map_lookup_elem]; \
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r0 = 0; \
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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_hash_16b)
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: __clobber_all);
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}
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SEC("socket")
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__description("bpf_map_ptr: r = 0, r = r + map_ptr")
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__success __failure_unpriv
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__msg_unpriv("R0 has pointer with unsupported alu operation")
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__retval(0)
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__naked void _0_r_r_map_ptr(void)
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{
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asm volatile (" \
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r0 = 0; \
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*(u64*)(r10 - 8) = r0; \
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r2 = r10; \
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r2 += -8; \
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r1 = 0; \
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r0 = %[map_hash_16b] ll; \
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r1 += r0; \
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call %[bpf_map_lookup_elem]; \
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r0 = 0; \
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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_hash_16b)
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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