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memmod: do not use IsBadReadPtr

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It should be enough to check for the trailing zero name.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-03-03 14:38:26 +01:00
parent 0eb7206295
commit 497ba95de7
4 changed files with 1 additions and 61 deletions
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2
tun/wintun/memmod/memmod_windows.go
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@ -312,7 +312,7 @@ func (module *Module) buildImportTable() error {
module.modules = make([]windows.Handle, 0, 16) module.modules = make([]windows.Handle, 0, 16)
importDesc := (*IMAGE_IMPORT_DESCRIPTOR)(a2p(module.codeBase + uintptr(directory.VirtualAddress))) importDesc := (*IMAGE_IMPORT_DESCRIPTOR)(a2p(module.codeBase + uintptr(directory.VirtualAddress)))
for !isBadReadPtr(uintptr(unsafe.Pointer(importDesc)), unsafe.Sizeof(*importDesc)) && importDesc.Name != 0 { for importDesc.Name != 0 {
handle, err := windows.LoadLibraryEx(windows.BytePtrToString((*byte)(a2p(module.codeBase+uintptr(importDesc.Name)))), 0, windows.LOAD_LIBRARY_SEARCH_SYSTEM32) handle, err := windows.LoadLibraryEx(windows.BytePtrToString((*byte)(a2p(module.codeBase+uintptr(importDesc.Name)))), 0, windows.LOAD_LIBRARY_SEARCH_SYSTEM32)
if err != nil { if err != nil {
return fmt.Errorf("Error loading module: %w", err) return fmt.Errorf("Error loading module: %w", err)

8
tun/wintun/memmod/mksyscall.go
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@ -1,8 +0,0 @@
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package memmod
//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go syscall_windows.go

2
tun/wintun/memmod/syscall_windows.go
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@ -324,8 +324,6 @@ const (
DLL_PROCESS_DETACH = 0 DLL_PROCESS_DETACH = 0
) )
//sys isBadReadPtr(addr uintptr, ucb uintptr) (ret bool) = kernel32.IsBadReadPtr
type SYSTEM_INFO struct { type SYSTEM_INFO struct {
ProcessorArchitecture uint16 ProcessorArchitecture uint16
Reserved uint16 Reserved uint16

50
tun/wintun/memmod/zsyscall_windows.go
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@ -1,50 +0,0 @@
// Code generated by 'go generate'; DO NOT EDIT.
package memmod
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
var _ unsafe.Pointer
// Do the interface allocations only once for common
// Errno values.
const (
errnoERROR_IO_PENDING = 997
)
var (
errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
errERROR_EINVAL error = syscall.EINVAL
)
// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
switch e {
case 0:
return errERROR_EINVAL
case errnoERROR_IO_PENDING:
return errERROR_IO_PENDING
}
// TODO: add more here, after collecting data on the common
// error values see on Windows. (perhaps when running
// all.bat?)
return e
}
var (
modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
procIsBadReadPtr = modkernel32.NewProc("IsBadReadPtr")
)
func isBadReadPtr(addr uintptr, ucb uintptr) (ret bool) {
r0, _, _ := syscall.Syscall(procIsBadReadPtr.Addr(), 2, uintptr(addr), uintptr(ucb), 0)
ret = r0 != 0
return
}