1// SPDX-License-Identifier: GPL-2.0
2/* Converted from tools/testing/selftests/bpf/verifier/xadd.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("tc")
16__description("xadd/w check unaligned stack")
17__failure __msg("misaligned stack access off")
18__naked void xadd_w_check_unaligned_stack(void)
19{
20	asm volatile ("					\
21	r0 = 1;						\
22	*(u64*)(r10 - 8) = r0;				\
23	lock *(u32 *)(r10 - 7) += w0;			\
24	r0 = *(u64*)(r10 - 8);				\
25	exit;						\
26"	::: __clobber_all);
27}
28
29SEC("tc")
30__description("xadd/w check unaligned map")
31__failure __msg("misaligned value access off")
32__naked void xadd_w_check_unaligned_map(void)
33{
34	asm volatile ("					\
35	r1 = 0;						\
36	*(u64*)(r10 - 8) = r1;				\
37	r2 = r10;					\
38	r2 += -8;					\
39	r1 = %[map_hash_8b] ll;				\
40	call %[bpf_map_lookup_elem];			\
41	if r0 != 0 goto l0_%=;				\
42	exit;						\
43l0_%=:	r1 = 1;						\
44	lock *(u32 *)(r0 + 3) += w1;			\
45	r0 = *(u32*)(r0 + 3);				\
46	exit;						\
47"	:
48	: __imm(bpf_map_lookup_elem),
49	  __imm_addr(map_hash_8b)
50	: __clobber_all);
51}
52
53SEC("xdp")
54__description("xadd/w check unaligned pkt")
55__failure __msg("BPF_ATOMIC stores into R2 pkt is not allowed")
56__flag(BPF_F_ANY_ALIGNMENT)
57__naked void xadd_w_check_unaligned_pkt(void)
58{
59	asm volatile ("					\
60	r2 = *(u32*)(r1 + %[xdp_md_data]);		\
61	r3 = *(u32*)(r1 + %[xdp_md_data_end]);		\
62	r1 = r2;					\
63	r1 += 8;					\
64	if r1 < r3 goto l0_%=;				\
65	r0 = 99;					\
66	goto l1_%=;					\
67l0_%=:	r0 = 1;						\
68	r1 = 0;						\
69	*(u32*)(r2 + 0) = r1;				\
70	r1 = 0;						\
71	*(u32*)(r2 + 3) = r1;				\
72	lock *(u32 *)(r2 + 1) += w0;			\
73	lock *(u32 *)(r2 + 2) += w0;			\
74	r0 = *(u32*)(r2 + 1);				\
75l1_%=:	exit;						\
76"	:
77	: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
78	  __imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
79	: __clobber_all);
80}
81
82SEC("tc")
83__description("xadd/w check whether src/dst got mangled, 1")
84__success __retval(3)
85__naked void src_dst_got_mangled_1(void)
86{
87	asm volatile ("					\
88	r0 = 1;						\
89	r6 = r0;					\
90	r7 = r10;					\
91	*(u64*)(r10 - 8) = r0;				\
92	lock *(u64 *)(r10 - 8) += r0;			\
93	lock *(u64 *)(r10 - 8) += r0;			\
94	if r6 != r0 goto l0_%=;				\
95	if r7 != r10 goto l0_%=;			\
96	r0 = *(u64*)(r10 - 8);				\
97	exit;						\
98l0_%=:	r0 = 42;					\
99	exit;						\
100"	::: __clobber_all);
101}
102
103SEC("tc")
104__description("xadd/w check whether src/dst got mangled, 2")
105__success __retval(3)
106__naked void src_dst_got_mangled_2(void)
107{
108	asm volatile ("					\
109	r0 = 1;						\
110	r6 = r0;					\
111	r7 = r10;					\
112	*(u32*)(r10 - 8) = r0;				\
113	lock *(u32 *)(r10 - 8) += w0;			\
114	lock *(u32 *)(r10 - 8) += w0;			\
115	if r6 != r0 goto l0_%=;				\
116	if r7 != r10 goto l0_%=;			\
117	r0 = *(u32*)(r10 - 8);				\
118	exit;						\
119l0_%=:	r0 = 42;					\
120	exit;						\
121"	::: __clobber_all);
122}
123
124char _license[] SEC("license") = "GPL";
125