Hello everyone,
I wanted to know whether the issue of Application Verifier (
https://docs.microsoft.com/en-us/windows/desktop/win7appqual/application-verifier
) crashing when used on a C (or C++) program linked with a CGO-generated
DLL.
This happens with Golang 1.11.4 and 1.11.5 for sure.
The repro is the following (needs a Windows with MingW-w64 installed and in
the PATH):
1) Have this file in a folder with the name "main.go":
package main
import "C"
import "fmt"
//export test
func test(str *C.char) int64 {
fmt.Print(C.GoString(str))
return 42
}
func main() {
}
2) Execute "go build -buildmode=c-shared -o test.dll"
3) Create the following file in the same older folder with the name
"main.c":
#include <stdio.h>
#include "test.h"
int main() {
printf("%lld", test("Foo\n"));
return 0;
}
4) Run "gcc -g test.dll main.c -o test.exe"
5) In Application Verifier, enable the "Basics" category for the test.exe
executable
6) Start "gdb test.exe" and run the program
7) Boom
I suspect the "_rt0_amd64_windows_lib" routine (written in Go ASM, in
src/runtime/rt0_windows_amd64.s in Golang's sources) to do some nasty stuff
from a Windows ABI point-of-view (it looks correct from what I could
understand when reading it though).
Then Application Verifier tries to walk the stack from some low-level heap
allocation function, and crashes doing so.
Hoping someone here might have som insight for me,
Thanks,
Pierre FRANCO
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