Question

晚上好，

我一直在尝试构建一个golang应用程序，它扫描内存中的值，但我正在努力了解如何解决特定的内存位置。我知道当访问应用程序中的内存时，您可以使用*variablename来推荐并获取地址位置，但是我如何提供地址位置并将值打印到屏幕或从中获取任何大小的下一个已分配对象RAM并打印它的价值？

提前感谢您愿意分享的任何帮助

Answer 1

我不知道这会有多大用处，但这里有一个示例代码。

package main

import (
    "fmt"
    "unsafe"
)

func main() {
    var i int = 1
    fmt.Println("Address : ", &i, " Value : ", i)

    var address *int
    address = &i // getting the starting address

    loc := (uintptr)(unsafe.Pointer(address))
    p := unsafe.Pointer(loc)

    // verification - it should print 1
    var val int = *((* int)(p))
    fmt.Println("Location : ", loc, " Val :",val) // it does print !!

    // lets print 1000 bytes starting from address of variable i
    // first memory location contains 1 as expected
    printValueAtMemoryLocation(loc, 1000)

    // now lets test for some arbitrary memory location
    // not so random ! wanted to reduce the diff value also any arbitrary memory location you can't read !!
    memoryToReach := 842350500000
    loc = changeToInputLocation(loc, memoryToReach)
    fmt.Println("Loc is now at : ", loc)
    // lets print 1000 bytes starting from the memory location "memoryToReach"
    printValueAtMemoryLocation(loc, 1000)

}

func changeToInputLocation(location uintptr, locationToreach int) uintptr {
    var diff,i int
    diff = locationToreach - int(location)

    fmt.Println("We need to travel ", diff, " memory locations !")

    if diff < 0 {
        i= diff * -1
        for i > 0 {
            location--
            i--
        }
    } else {
        i= diff
        for i > 0 {
            location++
            i--
        }
    }
    return location
}

func printValueAtMemoryLocation(location uintptr, next int) {
    var v byte
    p := unsafe.Pointer(location)
    fmt.Println("\n")
    for i:=1; i<next; i++ {
        p = unsafe.Pointer(location)
        v = *((*byte)(p))
        fmt.Print(v," ")
        //fmt.Println("Loc : ", loc, " --- Val : ", v)
        location++
    }
    fmt.Println("\n")
}

使用“不安全”包不是一个好主意，也不能读到我认为的任何位置。

对我来说，当我尝试其他随机位置时，很可能，我没有读取权限，它给我这样的错误：

unexpected fault address 0xc41ff8f780
fatal error: fault
[signal SIGBUS: bus error code=0x2 addr=0xc41ff8f780 pc=0x1093ec0]

但希望它对你有所帮助。

使用Golang读取随机内存位置

1 个答案: