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inst_fix_test.go
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inst_fix_test.go
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package gohook
import (
"reflect"
"testing"
"unsafe"
"github.com/stretchr/testify/assert"
)
func TestGetInsLenGreaterThan(t *testing.T) {
ResetFuncPrologue()
c1 := []byte{0x64, 0x48, 0x8b, 0x0c, 0x25, 0xf8}
c2 := []byte{0x64, 0x48, 0x8b, 0x0c, 0x25, 0xf8, 0xff, 0xff, 0xff}
r1 := GetInsLenGreaterThan(64, c1, len(c1)-2)
assert.Equal(t, 0, r1)
r2 := GetInsLenGreaterThan(64, c2, len(c2)-2)
assert.Equal(t, len(c2), r2)
r22 := GetInsLenGreaterThan(64, c2, len(c2))
assert.Equal(t, len(c2), r22)
r23 := GetInsLenGreaterThan(64, c2, len(c2)+2)
assert.Equal(t, 0, r23)
c3 := []byte{0x64, 0x48, 0x8b, 0x0c, 0x25, 0xf8, 0xff, 0xff, 0xff, 0x48, 0x3b, 0x41, 0x10}
r3 := GetInsLenGreaterThan(64, c3, len(c2)+2)
assert.Equal(t, len(c3), r3)
r32 := GetInsLenGreaterThan(64, c3, len(c2)-2)
assert.Equal(t, len(c2), r32)
}
func TestFixOneInstructionForTwoByteJmp(t *testing.T) {
ResetFuncPrologue()
// jump from within patching erea to outside, negative fix
c1 := []byte{0x75, 0x40} // jne 64
l1, t1, r1 := FixOneInstruction(64, false, 10, 12, c1, 100, 8)
assert.Equal(t, 2, l1)
assert.Equal(t, FT_CondJmp, t1)
assert.Equal(t, c1[0], r1[0])
assert.Equal(t, int8(-26), int8(r1[1]))
// jump from within patching erea to outside, positive fix
l2, t2, r2 := FixOneInstruction(64, false, 10, 12, c1, 26, 8)
assert.Equal(t, 2, l2)
assert.Equal(t, FT_CondJmp, t2)
assert.Equal(t, c1[0], r2[0])
assert.Equal(t, int8(48), int8(r2[1]))
//overflow test
l3, t3, r3 := FixOneInstruction(64, false, 10, 12, c1, 1000, 8)
assert.Equal(t, 2, l3)
assert.Equal(t, FT_OVERFLOW, t3)
assert.Equal(t, c1[0], r3[0])
assert.Equal(t, c1[1], r3[1])
// overflow test2
c32 := []byte{0x75, 0x7e} // jne 0x7e
l32, t32, r32 := FixOneInstruction(64, false, 30, 32, c32, 10, 8)
assert.Equal(t, 2, l32)
assert.Equal(t, FT_OVERFLOW, t32)
assert.Equal(t, c32[0], r32[0])
assert.Equal(t, c32[1], r32[1])
// jump from outside patching erea to outside of patching erea
l4, t4, r4 := FixOneInstruction(64, false, 10, 18, c1, 100, 4)
assert.Equal(t, 2, l4)
assert.Equal(t, FT_SKIP, t4)
assert.Equal(t, c1[0], r4[0])
assert.Equal(t, c1[1], r4[1])
// jump from outside patching erea to within patching erea
c2 := []byte{0x75, 0xe6} // jne -26
l5, t5, r5 := FixOneInstruction(64, false, 10, 38, c2, 100, 8)
assert.Equal(t, 2, l5)
assert.Equal(t, FT_CondJmp, t5)
assert.Equal(t, c2[0], r5[0])
assert.Equal(t, 64, int(r5[1]))
// jump within patching erea
c3 := []byte{0x75, 0x06} // jne 6
l6, t6, r6 := FixOneInstruction(64, false, 10, 12, c3, 100, 11)
assert.Equal(t, 2, l6)
assert.Equal(t, FT_SKIP, t6)
assert.Equal(t, c3[0], r6[0])
assert.Equal(t, c3[1], r6[1])
// sign test, from outside to outside
c4 := []byte{0x7c, 0xcd} // jne -51
l7, t7, r7 := FixOneInstruction(64, false, 10, 83, c4, 1000, 10)
assert.Equal(t, 2, l7)
assert.Equal(t, FT_SKIP, t7)
assert.Equal(t, c4[0], r7[0])
assert.Equal(t, c4[1], r7[1])
}
func byteToInt32(d []byte) int32 {
v := int32(uint32(d[0]) | (uint32(d[1]) << 8) | (uint32(d[2]) << 16) | (uint32(d[3]) << 24))
return v
}
func TestFixOneInstructionForSixByteJmp(t *testing.T) {
ResetFuncPrologue()
// jump from within patching erea to outside, negative fix
c1 := []byte{0x0f, 0x8d, 0x10, 0x00, 0x00, 0x00} // jge 16
l1, t1, r1 := FixOneInstruction(64, false, 20, 22, c1, 100, 8)
assert.Equal(t, 6, l1)
assert.Equal(t, FT_CondJmp, t1)
assert.Equal(t, c1[0], r1[0])
assert.Equal(t, c1[1], r1[1])
assert.Equal(t, int32(-64), byteToInt32(r1[2:]))
// jump from within patching erea to outside, positive fix
c2 := []byte{0x0f, 0x8d, 0x40, 0x00, 0x00, 0x00} // jge 64
l2, t2, r2 := FixOneInstruction(64, false, 2, 4, c2, 32, 9)
assert.Equal(t, 6, l2)
assert.Equal(t, FT_CondJmp, t2)
assert.Equal(t, c2[0], r2[0])
assert.Equal(t, c2[1], r2[1])
assert.Equal(t, int32(34), byteToInt32(r2[2:]))
// overflow test
c3 := []byte{0x0f, 0x8d, 0xfe, 0xff, 0xff, 0x7f} // jge 64
l3, t3, r3 := FixOneInstruction(64, false, 10000, 10004, c3, 100, 16)
assert.Equal(t, 6, l3)
assert.Equal(t, FT_OVERFLOW, t3)
assert.Equal(t, c3[0], r3[0])
assert.Equal(t, c3[1], r3[1])
assert.Equal(t, c3[2], r3[2])
assert.Equal(t, c3[3], r3[3])
assert.Equal(t, c3[4], r3[4])
assert.Equal(t, c3[5], r3[5])
// jump from outside patching erea to outside of patching erea
c4 := []byte{0x0f, 0x8d, 0x40, 0x00, 0x00, 0x00} // jge 64
l4, t4, r4 := FixOneInstruction(64, false, 10, 33, c4, 22, 9)
assert.Equal(t, 6, l4)
assert.Equal(t, FT_SKIP, t4)
assert.Equal(t, c4[0], r4[0])
assert.Equal(t, c4[1], r4[1])
assert.Equal(t, c4[2], r4[2])
assert.Equal(t, c4[3], r4[3])
assert.Equal(t, c4[4], r4[4])
assert.Equal(t, c4[5], r4[5])
// jump from outside patching erea to within patching erea
c5 := []byte{0x0f, 0x85, 0xce, 0xff, 0xff, 0xff} // jne -50
l5, t5, r5 := FixOneInstruction(64, false, 10, 60, c5, 1000, 9)
assert.Equal(t, 6, l5)
assert.Equal(t, FT_CondJmp, t5)
assert.Equal(t, c5[0], r5[0])
assert.Equal(t, c5[1], r5[1])
assert.Equal(t, int32(940), byteToInt32(r5[2:]))
// jump within patching erea
c6 := []byte{0x0f, 0x85, 0x10, 0x00, 0x00, 0x00} // jne 16
l6, t6, r6 := FixOneInstruction(64, false, 10, 12, c6, 1000, 30)
assert.Equal(t, 6, l6)
assert.Equal(t, FT_SKIP, t6)
assert.Equal(t, c6[0], r6[0])
assert.Equal(t, c6[1], r6[1])
assert.Equal(t, c6[2], r6[2])
assert.Equal(t, c6[3], r6[3])
assert.Equal(t, c6[4], r6[4])
assert.Equal(t, c6[5], r6[5])
}
func TestFixOneInstructionForFixByteJmp(t *testing.T) {
// jump from within patching erea to outside, negative fix
c1 := []byte{0xe9, 0x10, 0x00, 0x00, 0x00} // jmp 16
l1, t1, r1 := FixOneInstruction(64, false, 20, 22, c1, 100, 8)
assert.Equal(t, 5, l1)
assert.Equal(t, FT_JMP, t1)
assert.Equal(t, c1[0], r1[0])
assert.Equal(t, int32(-64), byteToInt32(r1[1:]))
// jump from within patching erea to outside, positive fix
c2 := []byte{0xe9, 0x40, 0x00, 0x00, 0x00} // jmp 64
l2, t2, r2 := FixOneInstruction(64, false, 2, 4, c2, 32, 9)
assert.Equal(t, 5, l2)
assert.Equal(t, FT_JMP, t2)
assert.Equal(t, c2[0], r2[0])
assert.Equal(t, int32(34), byteToInt32(r2[1:]))
// overflow test
c3 := []byte{0xe9, 0xfe, 0xff, 0xff, 0x7f} // jmp 64
l3, t3, r3 := FixOneInstruction(64, false, 10000, 10004, c3, 100, 16)
assert.Equal(t, 5, l3)
assert.Equal(t, FT_OVERFLOW, t3)
assert.Equal(t, c3[0], r3[0])
assert.Equal(t, c3[1], r3[1])
assert.Equal(t, c3[2], r3[2])
assert.Equal(t, c3[3], r3[3])
assert.Equal(t, c3[4], r3[4])
// jump from outside patching erea to outside of patching erea
c4 := []byte{0xe9, 0x40, 0x00, 0x00, 0x00} // jmp 64
l4, t4, r4 := FixOneInstruction(64, false, 10, 33, c4, 22, 9)
assert.Equal(t, 5, l4)
assert.Equal(t, FT_SKIP, t4)
assert.Equal(t, c4[0], r4[0])
assert.Equal(t, c4[1], r4[1])
assert.Equal(t, c4[2], r4[2])
assert.Equal(t, c4[3], r4[3])
assert.Equal(t, c4[4], r4[4])
// jump from outside patching erea to within patching erea
c5 := []byte{0xe9, 0xce, 0xff, 0xff, 0xff} // jmp -50
l5, t5, r5 := FixOneInstruction(64, false, 10, 60, c5, 1000, 9)
assert.Equal(t, 5, l5)
assert.Equal(t, FT_JMP, t5)
assert.Equal(t, c5[0], r5[0])
assert.Equal(t, int32(940), byteToInt32(r5[1:]))
// jump within patching erea
c6 := []byte{0xe9, 0x10, 0x00, 0x00, 0x00} // jmp 16
l6, t6, r6 := FixOneInstruction(64, false, 10, 12, c6, 1000, 30)
assert.Equal(t, 5, l6)
assert.Equal(t, FT_SKIP, t6)
assert.Equal(t, c6[0], r6[0])
assert.Equal(t, c6[1], r6[1])
assert.Equal(t, c6[2], r6[2])
assert.Equal(t, c6[3], r6[3])
assert.Equal(t, c6[4], r6[4])
// jump from outside to outside, sign test
c7 := []byte{0xe8, 0xdc, 0xfb, 0xff, 0xff} // jmp -1060
l7, t7, r7 := FixOneInstruction(64, false, 2000, 4100, c7, 10000, 30)
assert.Equal(t, 5, l7)
assert.Equal(t, FT_SKIP, t7)
assert.Equal(t, c7[0], r7[0])
assert.Equal(t, c7[1], r7[1])
assert.Equal(t, c7[2], r7[2])
assert.Equal(t, c7[3], r7[3])
assert.Equal(t, c7[4], r7[4])
}
func TestFixFuncCode(t *testing.T) {
p := []byte{0x64, 0x48, 0x8b, 0x0c, 0x25, 0xf8, 0xff, 0xff, 0xff} // move %fs:0xfffffffffffffff8, %rcx
c1 := []byte{
/*0:*/ 0x64, 0x48, 0x8b, 0x0c, 0x25, 0xf8, 0xff, 0xff, 0xff, // move %fs:0xfffffffffffffff8, %rcx sz:9
/*9:*/ 0x48, 0x8d, 0x44, 0x24, 0xe0, // lea -0x20(%rsp),%rax sz:5
/*14:*/ 0x48, 0x3b, 0x41, 0x10, // cmp 0x10(%rcx),%rax sz:4
/*18:*/ 0x0f, 0x86, 0xc3, 0x01, 0x00, 0x00, // jbe 451 sz:6
/*24:*/ 0x48, 0x81, 0xec, 0xa0, 0x00, 0x00, 0x00, // sub $0xa0,%rsp sz:7
/*31:*/ 0x48, 0x8b, 0x9c, 0x24, 0xa8, 0x00, 0x00, 0x00, // mov 0xa8(%rsp),%rbx sz:8
/*39:*/ 0xe3, 0x02, // jmp 02 sz:2
/*41:*/ 0x90, // nop sz:1
/*42:*/ 0x90, // nop sz:1
/*43:*/ 0x90, // nop sz:1
/*44:*/ 0x90, // nop sz:1
//////////patching erea end: 45 bytes/////////////////////////////////////////
/*45:*/ 0x48, 0x89, 0x5c, 0x24, 0x40, // mov %rbx,0x40(%rsp) sz:5
/*50:*/ 0xe9, 0xd2, 0xff, 0xff, 0xff, // jmp -46 sz:5
/*55:*/ 0x90, // nop sz:1
/*56:*/ 0x90, // nop sz:1
/*57:*/ 0x90, // nop sz:1
/*58:*/ 0x90, // nop sz:1
}
SetFuncPrologue(64, []byte{0x64, 0x48, 0x8b, 0x0c, 0x25, 0xf8, 0xff, 0xff, 0xff, 0x48})
sh1 := (*reflect.SliceHeader)((unsafe.Pointer(&c1)))
move_sz := 45
startAddr := sh1.Data
toAddr := startAddr + 100000
fix1, err1 := FixTargetFuncCode(64, startAddr, uint32(len(c1)), toAddr, move_sz)
assert.Nil(t, err1)
assert.Equal(t, 2, len(fix1))
assert.Equal(t, startAddr+uintptr(18), fix1[0].Addr)
assert.Equal(t, startAddr+uintptr(50), fix1[1].Addr)
assert.Equal(t, 6, len(fix1[0].Code))
assert.Equal(t, byte(0x0f), fix1[0].Code[0])
assert.Equal(t, byte(0x86), fix1[0].Code[1])
assert.Equal(t, int32(startAddr+451-toAddr), byteToInt32(fix1[0].Code[2:]))
assert.Equal(t, 5, len(fix1[1].Code))
assert.Equal(t, byte(0xe9), fix1[1].Code[0])
assert.Equal(t, int32(toAddr+9-startAddr-50-5), byteToInt32(fix1[1].Code[1:]))
c2 := append(c1, p...)
sh2 := (*reflect.SliceHeader)((unsafe.Pointer(&c2)))
startAddr = sh2.Data
toAddr = startAddr + 100000
fix2, err2 := FixTargetFuncCode(64, startAddr, 0, toAddr, move_sz)
assert.Nil(t, err2)
assert.Equal(t, 2, len(fix2))
assert.Equal(t, startAddr+uintptr(18), fix2[0].Addr)
assert.Equal(t, startAddr+uintptr(50), fix2[1].Addr)
assert.Equal(t, 6, len(fix2[0].Code))
assert.Equal(t, byte(0x0f), fix2[0].Code[0])
assert.Equal(t, byte(0x86), fix2[0].Code[1])
assert.Equal(t, int32(startAddr+451-toAddr), byteToInt32(fix2[0].Code[2:]))
assert.Equal(t, 5, len(fix2[1].Code))
assert.Equal(t, byte(0xe9), fix2[1].Code[0])
assert.Equal(t, int32(toAddr+9-startAddr-50-5), byteToInt32(fix2[1].Code[1:]))
}