95e33edf53
Per https://pkg.go.dev/unsafe#Pointer conversions from unsafe.Pointer to uintptr are only safe in limited circumstances. In particular only conversions made in the syscall call are pinned. Additionally add a call to runtime.KeepAlive to mitigate the bug described in: https://github.com/golang/go/issues/58351
36 lines
1.1 KiB
Go
36 lines
1.1 KiB
Go
//go:build (linux && amd64) || (linux && arm64)
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// +build linux,amd64 linux,arm64
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package native
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import (
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"syscall"
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"unsafe"
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sys "golang.org/x/sys/unix"
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)
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// processVmRead calls process_vm_readv
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func processVmRead(tid int, addr uintptr, data []byte) (int, error) {
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len_iov := uint64(len(data))
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local_iov := sys.Iovec{Base: &data[0], Len: len_iov}
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remote_iov := remoteIovec{base: addr, len: uintptr(len_iov)}
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n, _, err := syscall.Syscall6(sys.SYS_PROCESS_VM_READV, uintptr(tid), uintptr(unsafe.Pointer(&local_iov)), 1, uintptr(unsafe.Pointer(&remote_iov)), 1, 0)
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if err != syscall.Errno(0) {
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return 0, err
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}
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return int(n), nil
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}
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// processVmWrite calls process_vm_writev
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func processVmWrite(tid int, addr uintptr, data []byte) (int, error) {
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len_iov := uint64(len(data))
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local_iov := sys.Iovec{Base: &data[0], Len: len_iov}
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remote_iov := remoteIovec{base: addr, len: uintptr(len_iov)}
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n, _, err := syscall.Syscall6(sys.SYS_PROCESS_VM_WRITEV, uintptr(tid), uintptr(unsafe.Pointer(&local_iov)), 1, uintptr(unsafe.Pointer(&remote_iov)), 1, 0)
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if err != syscall.Errno(0) {
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return 0, err
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}
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return int(n), nil
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}
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