mirror of
https://github.com/golang/go
synced 2024-11-11 19:21:37 -07:00
cmd/link: don't reset variable size when handling -X flag
The linker's -X flag allows setting/changing a string variable's content at link time. Currently it resets its size then write a new string header pointing to the new content. This mostly works. But under ASAN build the string variable can have larger size than the usual 2 words, due to the red zone. Resetting the size can cause the variable to "overlap" (in ASAN's view) with other variables. Don't reset the size. Fixes #56175. Change-Id: Ib364208201a7a2fd7f44f9b1797834198736a405 Reviewed-on: https://go-review.googlesource.com/c/go/+/442635 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
parent
36ca37f3a0
commit
9fe17a0340
@ -5,6 +5,7 @@
|
||||
package sanitizers_test
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"strings"
|
||||
"testing"
|
||||
)
|
||||
@ -97,3 +98,44 @@ func TestASAN(t *testing.T) {
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestASANLinkerX(t *testing.T) {
|
||||
// Test ASAN with linker's -X flag (see issue 56175).
|
||||
goos, err := goEnv("GOOS")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
goarch, err := goEnv("GOARCH")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
// The asan tests require support for the -asan option.
|
||||
if !aSanSupported(goos, goarch) {
|
||||
t.Skipf("skipping on %s/%s; -asan option is not supported.", goos, goarch)
|
||||
}
|
||||
if !compilerRequiredAsanVersion(goos, goarch) {
|
||||
t.Skipf("skipping on %s/%s: too old version of compiler", goos, goarch)
|
||||
}
|
||||
|
||||
t.Parallel()
|
||||
requireOvercommit(t)
|
||||
config := configure("address")
|
||||
config.skipIfCSanitizerBroken(t)
|
||||
|
||||
dir := newTempDir(t)
|
||||
defer dir.RemoveAll(t)
|
||||
|
||||
var ldflags string
|
||||
for i := 1; i <= 10; i++ {
|
||||
ldflags += fmt.Sprintf("-X=main.S%d=%d -X=misc/cgo/testsanitizers/testdata/asan_linkerx/p.S%d=%d ", i, i, i, i)
|
||||
}
|
||||
|
||||
// build the binary
|
||||
outPath := dir.Join("main.exe")
|
||||
cmd := config.goCmd("build", "-ldflags="+ldflags, "-o", outPath)
|
||||
cmd.Dir = srcPath("asan_linkerx")
|
||||
mustRun(t, cmd)
|
||||
|
||||
// run the binary
|
||||
mustRun(t, hangProneCmd(outPath))
|
||||
}
|
||||
|
28
misc/cgo/testsanitizers/testdata/asan_linkerx/main.go
vendored
Normal file
28
misc/cgo/testsanitizers/testdata/asan_linkerx/main.go
vendored
Normal file
@ -0,0 +1,28 @@
|
||||
package main
|
||||
|
||||
import "misc/cgo/testsanitizers/testdata/asan_linkerx/p"
|
||||
|
||||
func pstring(s *string) {
|
||||
println(*s)
|
||||
}
|
||||
|
||||
func main() {
|
||||
all := []*string{
|
||||
&S1, &S2, &S3, &S4, &S5, &S6, &S7, &S8, &S9, &S10,
|
||||
&p.S1, &p.S2, &p.S3, &p.S4, &p.S5, &p.S6, &p.S7, &p.S8, &p.S9, &p.S10,
|
||||
}
|
||||
for _, ps := range all {
|
||||
pstring(ps)
|
||||
}
|
||||
}
|
||||
|
||||
var S1 string
|
||||
var S2 string
|
||||
var S3 string
|
||||
var S4 string
|
||||
var S5 string
|
||||
var S6 string
|
||||
var S7 string
|
||||
var S8 string
|
||||
var S9 string
|
||||
var S10 string
|
12
misc/cgo/testsanitizers/testdata/asan_linkerx/p/p.go
vendored
Normal file
12
misc/cgo/testsanitizers/testdata/asan_linkerx/p/p.go
vendored
Normal file
@ -0,0 +1,12 @@
|
||||
package p
|
||||
|
||||
var S1 string
|
||||
var S2 string
|
||||
var S3 string
|
||||
var S4 string
|
||||
var S5 string
|
||||
var S6 string
|
||||
var S7 string
|
||||
var S8 string
|
||||
var S9 string
|
||||
var S10 string
|
@ -1127,12 +1127,14 @@ func addstrdata(arch *sys.Arch, l *loader.Loader, name, value string) {
|
||||
sbld.Addstring(value)
|
||||
sbld.SetType(sym.SRODATA)
|
||||
|
||||
bld.SetSize(0)
|
||||
bld.SetData(make([]byte, 0, arch.PtrSize*2))
|
||||
// Don't reset the variable's size. String variable usually has size of
|
||||
// 2*PtrSize, but in ASAN build it can be larger due to red zone.
|
||||
// (See issue 56175.)
|
||||
bld.SetData(make([]byte, arch.PtrSize*2))
|
||||
bld.SetReadOnly(false)
|
||||
bld.ResetRelocs()
|
||||
bld.AddAddrPlus(arch, sbld.Sym(), 0)
|
||||
bld.AddUint(arch, uint64(len(value)))
|
||||
bld.SetAddrPlus(arch, 0, sbld.Sym(), 0)
|
||||
bld.SetUint(arch, int64(arch.PtrSize), uint64(len(value)))
|
||||
}
|
||||
|
||||
func (ctxt *Link) dostrdata() {
|
||||
|
Loading…
Reference in New Issue
Block a user