33772ff3b8
Add a test case for PTR_TO_FLOW_KEYS alu. Testing if alu with variable offset on flow_keys is rejected. For the fixed offset success case, we already have C code coverage to verify (e.g. via bpf_flow.c). Signed-off-by: Hao Sun <sunhao.th@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/bpf/20240115082028.9992-2-sunhao.th@gmail.com
169 lines
3.8 KiB
C
169 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/value_illegal_alu.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 illegal alu op, 1")
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__failure __msg("R0 bitwise operator &= on pointer")
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__failure_unpriv
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__naked void value_illegal_alu_op_1(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 &= 8; \
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r1 = 22; \
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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 illegal alu op, 2")
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__failure __msg("R0 32-bit pointer arithmetic prohibited")
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__failure_unpriv
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__naked void value_illegal_alu_op_2(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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w0 += 0; \
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r1 = 22; \
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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 illegal alu op, 3")
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__failure __msg("R0 pointer arithmetic with /= operator")
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__failure_unpriv
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__naked void value_illegal_alu_op_3(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 /= 42; \
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r1 = 22; \
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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 illegal alu op, 4")
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__failure __msg("invalid mem access 'scalar'")
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__failure_unpriv __msg_unpriv("R0 pointer arithmetic prohibited")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void value_illegal_alu_op_4(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 = be64 r0; \
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r1 = 22; \
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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 illegal alu op, 5")
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__failure __msg("R0 invalid mem access 'scalar'")
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__msg_unpriv("leaking pointer from stack off -8")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void value_illegal_alu_op_5(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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r3 = 4096; \
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r2 = r10; \
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r2 += -8; \
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*(u64*)(r2 + 0) = r0; \
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lock *(u64 *)(r2 + 0) += r3; \
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r0 = *(u64*)(r2 + 0); \
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r1 = 22; \
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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("flow_dissector")
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__description("flow_keys illegal alu op with variable offset")
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__failure __msg("R7 pointer arithmetic on flow_keys prohibited")
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__naked void flow_keys_illegal_variable_offset_alu(void)
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{
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asm volatile(" \
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r6 = r1; \
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r7 = *(u64*)(r6 + %[flow_keys_off]); \
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r8 = 8; \
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r8 /= 1; \
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r8 &= 8; \
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r7 += r8; \
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r0 = *(u64*)(r7 + 0); \
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exit; \
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" :
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: __imm_const(flow_keys_off, offsetof(struct __sk_buff, flow_keys))
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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