mirror of
https://github.com/golang/go
synced 2024-11-26 00:48:01 -07:00
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.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"encoding/binary"
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"runtime"
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"runtime/debug"
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"unsafe"
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)
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func main() {
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debug.SetPanicOnFault(true)
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defer func() {
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if err := recover(); err == nil {
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panic("not panicking")
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}
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pc, _, _, _ := runtime.Caller(10)
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f := runtime.FuncForPC(pc)
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if f == nil || f.Name() != "main.f" {
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if f == nil {
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println("no func for ", unsafe.Pointer(pc))
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} else {
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println("found func:", f.Name())
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}
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panic("cannot find main.f on stack")
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}
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}()
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f(20)
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}
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func f(n int) {
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if n > 0 {
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f(n - 1)
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}
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var f struct {
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x uintptr
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}
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// We want to force a seg fault, to get a crash at a PC value != 0.
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// Not all systems make the data section non-executable.
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ill := make([]byte, 64)
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switch runtime.GOARCH {
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case "386", "amd64":
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ill = append(ill[:0], 0x89, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00) // MOVL AX, 0
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case "arm":
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binary.LittleEndian.PutUint32(ill[0:4], 0xe3a00000) // MOVW $0, R0
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binary.LittleEndian.PutUint32(ill[4:8], 0xe5800000) // MOVW R0, (R0)
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case "arm64":
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binary.LittleEndian.PutUint32(ill, 0xf90003ff) // MOVD ZR, (ZR)
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case "ppc64":
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binary.BigEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
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case "ppc64le":
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binary.LittleEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
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case "mips", "mips64":
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binary.BigEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
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case "mipsle", "mips64le":
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binary.LittleEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
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case "s390x":
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ill = append(ill[:0], 0xa7, 0x09, 0x00, 0x00) // MOVD $0, R0
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ill = append(ill, 0xe3, 0x00, 0x00, 0x00, 0x00, 0x24) // MOVD R0, (R0)
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case "riscv64":
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binary.LittleEndian.PutUint32(ill, 0x00003023) // MOV X0, (X0)
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default:
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// Just leave it as 0 and hope for the best.
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}
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f.x = uintptr(unsafe.Pointer(&ill[0]))
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p := &f
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fn := *(*func())(unsafe.Pointer(&p))
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syncIcache(f.x)
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fn()
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}
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