1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/bpf.h>
4#include <bpf/bpf_helpers.h>
5#include "bpf_misc.h"
6
7#if (defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \
8 (defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64) || \
9 defined(__TARGET_ARCH_arm) || defined(__TARGET_ARCH_s390) || \
10 defined(__TARGET_ARCH_loongarch)) && \
11 __clang_major__ >= 18
12
13SEC("socket")
14__description("MOV32SX, S8")
15__success __success_unpriv __retval(0x23)
16__naked void mov32sx_s8(void)
17{
18 asm volatile (" \
19 w0 = 0xff23; \
20 w0 = (s8)w0; \
21 exit; \
22" ::: __clobber_all);
23}
24
25SEC("socket")
26__description("MOV32SX, S16")
27__success __success_unpriv __retval(0xFFFFff23)
28__naked void mov32sx_s16(void)
29{
30 asm volatile (" \
31 w0 = 0xff23; \
32 w0 = (s16)w0; \
33 exit; \
34" ::: __clobber_all);
35}
36
37SEC("socket")
38__description("MOV64SX, S8")
39__success __success_unpriv __retval(-2)
40__naked void mov64sx_s8(void)
41{
42 asm volatile (" \
43 r0 = 0x1fe; \
44 r0 = (s8)r0; \
45 exit; \
46" ::: __clobber_all);
47}
48
49SEC("socket")
50__description("MOV64SX, S16")
51__success __success_unpriv __retval(0xf23)
52__naked void mov64sx_s16(void)
53{
54 asm volatile (" \
55 r0 = 0xf0f23; \
56 r0 = (s16)r0; \
57 exit; \
58" ::: __clobber_all);
59}
60
61SEC("socket")
62__description("MOV64SX, S32")
63__success __success_unpriv __retval(-1)
64__naked void mov64sx_s32(void)
65{
66 asm volatile (" \
67 r0 = 0xfffffffe; \
68 r0 = (s32)r0; \
69 r0 >>= 1; \
70 exit; \
71" ::: __clobber_all);
72}
73
74SEC("socket")
75__description("MOV32SX, S8, range_check")
76__success __success_unpriv __retval(1)
77__naked void mov32sx_s8_range(void)
78{
79 asm volatile (" \
80 call %[bpf_get_prandom_u32]; \
81 w1 = (s8)w0; \
82 /* w1 with s8 range */ \
83 if w1 s> 0x7f goto l0_%=; \
84 if w1 s< -0x80 goto l0_%=; \
85 r0 = 1; \
86l1_%=: \
87 exit; \
88l0_%=: \
89 r0 = 2; \
90 goto l1_%=; \
91" :
92 : __imm(bpf_get_prandom_u32)
93 : __clobber_all);
94}
95
96SEC("socket")
97__description("MOV32SX, S16, range_check")
98__success __success_unpriv __retval(1)
99__naked void mov32sx_s16_range(void)
100{
101 asm volatile (" \
102 call %[bpf_get_prandom_u32]; \
103 w1 = (s16)w0; \
104 /* w1 with s16 range */ \
105 if w1 s> 0x7fff goto l0_%=; \
106 if w1 s< -0x80ff goto l0_%=; \
107 r0 = 1; \
108l1_%=: \
109 exit; \
110l0_%=: \
111 r0 = 2; \
112 goto l1_%=; \
113" :
114 : __imm(bpf_get_prandom_u32)
115 : __clobber_all);
116}
117
118SEC("socket")
119__description("MOV32SX, S16, range_check 2")
120__success __success_unpriv __retval(1)
121__naked void mov32sx_s16_range_2(void)
122{
123 asm volatile (" \
124 r1 = 65535; \
125 w2 = (s16)w1; \
126 r2 >>= 1; \
127 if r2 != 0x7fffFFFF goto l0_%=; \
128 r0 = 1; \
129l1_%=: \
130 exit; \
131l0_%=: \
132 r0 = 0; \
133 goto l1_%=; \
134" :
135 : __imm(bpf_get_prandom_u32)
136 : __clobber_all);
137}
138
139SEC("socket")
140__description("MOV64SX, S8, range_check")
141__success __success_unpriv __retval(1)
142__naked void mov64sx_s8_range(void)
143{
144 asm volatile (" \
145 call %[bpf_get_prandom_u32]; \
146 r1 = (s8)r0; \
147 /* r1 with s8 range */ \
148 if r1 s> 0x7f goto l0_%=; \
149 if r1 s< -0x80 goto l0_%=; \
150 r0 = 1; \
151l1_%=: \
152 exit; \
153l0_%=: \
154 r0 = 2; \
155 goto l1_%=; \
156" :
157 : __imm(bpf_get_prandom_u32)
158 : __clobber_all);
159}
160
161SEC("socket")
162__description("MOV64SX, S16, range_check")
163__success __success_unpriv __retval(1)
164__naked void mov64sx_s16_range(void)
165{
166 asm volatile (" \
167 call %[bpf_get_prandom_u32]; \
168 r1 = (s16)r0; \
169 /* r1 with s16 range */ \
170 if r1 s> 0x7fff goto l0_%=; \
171 if r1 s< -0x8000 goto l0_%=; \
172 r0 = 1; \
173l1_%=: \
174 exit; \
175l0_%=: \
176 r0 = 2; \
177 goto l1_%=; \
178" :
179 : __imm(bpf_get_prandom_u32)
180 : __clobber_all);
181}
182
183SEC("socket")
184__description("MOV64SX, S32, range_check")
185__success __success_unpriv __retval(1)
186__naked void mov64sx_s32_range(void)
187{
188 asm volatile (" \
189 call %[bpf_get_prandom_u32]; \
190 r1 = (s32)r0; \
191 /* r1 with s32 range */ \
192 if r1 s> 0x7fffffff goto l0_%=; \
193 if r1 s< -0x80000000 goto l0_%=; \
194 r0 = 1; \
195l1_%=: \
196 exit; \
197l0_%=: \
198 r0 = 2; \
199 goto l1_%=; \
200" :
201 : __imm(bpf_get_prandom_u32)
202 : __clobber_all);
203}
204
205SEC("socket")
206__description("MOV64SX, S16, R10 Sign Extension")
207__failure __msg("R1 type=scalar expected=fp, pkt, pkt_meta, map_key, map_value, mem, ringbuf_mem, buf, trusted_ptr_")
208__failure_unpriv __msg_unpriv("R10 sign-extension part of pointer")
209__naked void mov64sx_s16_r10(void)
210{
211 asm volatile (" \
212 r1 = 553656332; \
213 *(u32 *)(r10 - 8) = r1; \
214 r1 = (s16)r10; \
215 r1 += -8; \
216 r2 = 3; \
217 if r2 <= r1 goto l0_%=; \
218l0_%=: \
219 call %[bpf_trace_printk]; \
220 r0 = 0; \
221 exit; \
222" :
223 : __imm(bpf_trace_printk)
224 : __clobber_all);
225}
226
227#else
228
229SEC("socket")
230__description("cpuv4 is not supported by compiler or jit, use a dummy test")
231__success
232int dummy_test(void)
233{
234 return 0;
235}
236
237#endif
238
239char _license[] SEC("license") = "GPL";
240

source code of linux/tools/testing/selftests/bpf/progs/verifier_movsx.c