1 #include <linux/bug.h>
2 #include <linux/kernel.h>
3
4 #include "opcode.h"
5 #include "selftest.h"
6
7 struct selftest_opcode {
8 unsigned int expected_size;
9 const uint8_t *insn;
10 const char *desc;
11 };
12
13 static const struct selftest_opcode selftest_opcodes[] = {
14 /* REP MOVS */
15 {1, "\xf3\xa4", "rep movsb <mem8>, <mem8>"},
16 {4, "\xf3\xa5", "rep movsl <mem32>, <mem32>"},
17
18 /* MOVZX / MOVZXD */
19 {1, "\x66\x0f\xb6\x51\xf8", "movzwq <mem8>, <reg16>"},
20 {1, "\x0f\xb6\x51\xf8", "movzwq <mem8>, <reg32>"},
21
22 /* MOVSX / MOVSXD */
23 {1, "\x66\x0f\xbe\x51\xf8", "movswq <mem8>, <reg16>"},
24 {1, "\x0f\xbe\x51\xf8", "movswq <mem8>, <reg32>"},
25
26 #ifdef CONFIG_X86_64
27 /* MOVZX / MOVZXD */
28 {1, "\x49\x0f\xb6\x51\xf8", "movzbq <mem8>, <reg64>"},
29 {2, "\x49\x0f\xb7\x51\xf8", "movzbq <mem16>, <reg64>"},
30
31 /* MOVSX / MOVSXD */
32 {1, "\x49\x0f\xbe\x51\xf8", "movsbq <mem8>, <reg64>"},
33 {2, "\x49\x0f\xbf\x51\xf8", "movsbq <mem16>, <reg64>"},
34 {4, "\x49\x63\x51\xf8", "movslq <mem32>, <reg64>"},
35 #endif
36 };
37
selftest_opcode_one(const struct selftest_opcode * op)38 static bool selftest_opcode_one(const struct selftest_opcode *op)
39 {
40 unsigned size;
41
42 kmemcheck_opcode_decode(op->insn, &size);
43
44 if (size == op->expected_size)
45 return true;
46
47 printk(KERN_WARNING "kmemcheck: opcode %s: expected size %d, got %d\n",
48 op->desc, op->expected_size, size);
49 return false;
50 }
51
selftest_opcodes_all(void)52 static bool selftest_opcodes_all(void)
53 {
54 bool pass = true;
55 unsigned int i;
56
57 for (i = 0; i < ARRAY_SIZE(selftest_opcodes); ++i)
58 pass = pass && selftest_opcode_one(&selftest_opcodes[i]);
59
60 return pass;
61 }
62
kmemcheck_selftest(void)63 bool kmemcheck_selftest(void)
64 {
65 bool pass = true;
66
67 pass = pass && selftest_opcodes_all();
68
69 return pass;
70 }
71