mirror of
https://github.com/golang/go
synced 2024-10-01 16:28:33 -06:00
c7fa66179b
For some reason, aix sometimes executes the bogus function body. This should never happen as it lives in a no-execute section. It might be a transient permission blip as the heap grows. Add a small function to cleanup and synchronize the icache before jumping to the bogus function to ensure it causes a panic, not SIGILL. Fixes #44583 Change-Id: Iadca62d82bfb70fc62088705dac42a880a1208fa Reviewed-on: https://go-review.googlesource.com/c/go/+/377314 Trust: Bryan Mills <bcmills@google.com> Run-TryBot: Paul Murphy <murp@ibm.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com>
76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"runtime"
|
|
"runtime/debug"
|
|
"unsafe"
|
|
)
|
|
|
|
func main() {
|
|
debug.SetPanicOnFault(true)
|
|
defer func() {
|
|
if err := recover(); err == nil {
|
|
panic("not panicking")
|
|
}
|
|
pc, _, _, _ := runtime.Caller(10)
|
|
f := runtime.FuncForPC(pc)
|
|
if f == nil || f.Name() != "main.f" {
|
|
if f == nil {
|
|
println("no func for ", unsafe.Pointer(pc))
|
|
} else {
|
|
println("found func:", f.Name())
|
|
}
|
|
panic("cannot find main.f on stack")
|
|
}
|
|
}()
|
|
f(20)
|
|
}
|
|
|
|
func f(n int) {
|
|
if n > 0 {
|
|
f(n - 1)
|
|
}
|
|
var f struct {
|
|
x uintptr
|
|
}
|
|
|
|
// We want to force a seg fault, to get a crash at a PC value != 0.
|
|
// Not all systems make the data section non-executable.
|
|
ill := make([]byte, 64)
|
|
switch runtime.GOARCH {
|
|
case "386", "amd64":
|
|
ill = append(ill[:0], 0x89, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00) // MOVL AX, 0
|
|
case "arm":
|
|
binary.LittleEndian.PutUint32(ill[0:4], 0xe3a00000) // MOVW $0, R0
|
|
binary.LittleEndian.PutUint32(ill[4:8], 0xe5800000) // MOVW R0, (R0)
|
|
case "arm64":
|
|
binary.LittleEndian.PutUint32(ill, 0xf90003ff) // MOVD ZR, (ZR)
|
|
case "ppc64":
|
|
binary.BigEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
|
|
case "ppc64le":
|
|
binary.LittleEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
|
|
case "mips", "mips64":
|
|
binary.BigEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
|
|
case "mipsle", "mips64le":
|
|
binary.LittleEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
|
|
case "s390x":
|
|
ill = append(ill[:0], 0xa7, 0x09, 0x00, 0x00) // MOVD $0, R0
|
|
ill = append(ill, 0xe3, 0x00, 0x00, 0x00, 0x00, 0x24) // MOVD R0, (R0)
|
|
case "riscv64":
|
|
binary.LittleEndian.PutUint32(ill, 0x00003023) // MOV X0, (X0)
|
|
default:
|
|
// Just leave it as 0 and hope for the best.
|
|
}
|
|
|
|
f.x = uintptr(unsafe.Pointer(&ill[0]))
|
|
p := &f
|
|
fn := *(*func())(unsafe.Pointer(&p))
|
|
syncIcache(f.x)
|
|
fn()
|
|
}
|