1// SPDX-License-Identifier: GPL-2.0
2/* Converted from tools/testing/selftests/bpf/verifier/leak_ptr.c */
3
4#include <linux/bpf.h>
5#include <bpf/bpf_helpers.h>
6#include "bpf_misc.h"
7
8struct {
9	__uint(type, BPF_MAP_TYPE_HASH);
10	__uint(max_entries, 1);
11	__type(key, long long);
12	__type(value, long long);
13} map_hash_8b SEC(".maps");
14
15SEC("socket")
16__description("leak pointer into ctx 1")
17__failure __msg("BPF_ATOMIC stores into R1 ctx is not allowed")
18__failure_unpriv __msg_unpriv("R2 leaks addr into mem")
19__naked void leak_pointer_into_ctx_1(void)
20{
21	asm volatile ("					\
22	r0 = 0;						\
23	*(u64*)(r1 + %[__sk_buff_cb_0]) = r0;		\
24	r2 = %[map_hash_8b] ll;				\
25	lock *(u64 *)(r1 + %[__sk_buff_cb_0]) += r2;	\
26	exit;						\
27"	:
28	: __imm_addr(map_hash_8b),
29	  __imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
30	: __clobber_all);
31}
32
33SEC("socket")
34__description("leak pointer into ctx 2")
35__failure __msg("BPF_ATOMIC stores into R1 ctx is not allowed")
36__failure_unpriv __msg_unpriv("R10 leaks addr into mem")
37__naked void leak_pointer_into_ctx_2(void)
38{
39	asm volatile ("					\
40	r0 = 0;						\
41	*(u64*)(r1 + %[__sk_buff_cb_0]) = r0;		\
42	lock *(u64 *)(r1 + %[__sk_buff_cb_0]) += r10;	\
43	exit;						\
44"	:
45	: __imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
46	: __clobber_all);
47}
48
49SEC("socket")
50__description("leak pointer into ctx 3")
51__success __failure_unpriv __msg_unpriv("R2 leaks addr into ctx")
52__retval(0)
53__naked void leak_pointer_into_ctx_3(void)
54{
55	asm volatile ("					\
56	r0 = 0;						\
57	r2 = %[map_hash_8b] ll;				\
58	*(u64*)(r1 + %[__sk_buff_cb_0]) = r2;		\
59	exit;						\
60"	:
61	: __imm_addr(map_hash_8b),
62	  __imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
63	: __clobber_all);
64}
65
66SEC("socket")
67__description("leak pointer into map val")
68__success __failure_unpriv __msg_unpriv("R6 leaks addr into mem")
69__retval(0)
70__naked void leak_pointer_into_map_val(void)
71{
72	asm volatile ("					\
73	r6 = r1;					\
74	r1 = 0;						\
75	*(u64*)(r10 - 8) = r1;				\
76	r2 = r10;					\
77	r2 += -8;					\
78	r1 = %[map_hash_8b] ll;				\
79	call %[bpf_map_lookup_elem];			\
80	if r0 == 0 goto l0_%=;				\
81	r3 = 0;						\
82	*(u64*)(r0 + 0) = r3;				\
83	lock *(u64 *)(r0 + 0) += r6;			\
84l0_%=:	r0 = 0;						\
85	exit;						\
86"	:
87	: __imm(bpf_map_lookup_elem),
88	  __imm_addr(map_hash_8b)
89	: __clobber_all);
90}
91
92char _license[] SEC("license") = "GPL";
93