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