Bug#993318: bullseye-pu: package golang-1.15/1.15.15-1~deb11u1
On Fri, Dec 03, 2021 at 04:32:16PM +0100, Julien Cristau wrote:
> Control: tag -1 confirmed
>
> On Sat, Sep 11, 2021 at 06:04:13PM +0800, Shengjing Zhu wrote:
> > +golang-1.15 (1.15.15-1~deb11u1) bullseye; urgency=medium
>
> This looks fine to me, go ahead.
Thanks for the review. I'm not sure if it's too late to amend this
update.
I'd like to add two patches.
Amend for d/changelog:
* Backport patch for CVE-2021-38297
When invoking functions from WASM modules, built using GOARCH=wasm GOOS=js,
passing very large arguments can cause portions of the module to be overwritten
with data from the arguments.
* Backport patch for CVE-2021-41771
debug/macho: invalid dynamic symbol table command can cause panic
Amend two files in d/patches (attached)
+ debian/patches/0008-CVE-2021-38297.patch
This patch is small. Backport from upstream 1.16 branch directly without modification.
+ debian/patches/0009-CVE-2021-41771.patch
This is patch contains a large base64 testdata file, just for testing. Otherwise it's
small as well.
And it's also backport from upstream 1.16 branch directly with modification.
Other info:
The debian security tracker says golang-1.15 also affects CVE-2021-41772, but after checking
myself I think the affected code is introduced in golang 1.16
The debian security tracker also doesn't mention CVE-2021-38297
I will talk to security team to update the status on tracker.
From: Michael Knyszek <mknyszek@google.com>
Date: Thu, 2 Sep 2021 16:51:59 -0400
Subject: CVE-2021-38297
Origin: backport, https://github.com/golang/go/commit/4548fcc8
---
misc/wasm/wasm_exec.js | 7 +++++++
src/cmd/link/internal/ld/data.go | 11 ++++++++++-
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 8501ae7..b56f3f1 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -527,6 +527,13 @@
offset += 8;
});
+ // The linker guarantees global data starts from at least wasmMinDataAddr.
+ // Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
+ const wasmMinDataAddr = 4096 + 4096;
+ if (offset >= wasmMinDataAddr) {
+ throw new Error("command line too long");
+ }
+
this._inst.exports.run(argc, argv);
if (this.exited) {
this._resolveExitPromise();
diff --git a/src/cmd/link/internal/ld/data.go b/src/cmd/link/internal/ld/data.go
index 2b55a5f..ee5c794 100644
--- a/src/cmd/link/internal/ld/data.go
+++ b/src/cmd/link/internal/ld/data.go
@@ -2268,6 +2268,11 @@ func assignAddress(ctxt *Link, sect *sym.Section, n int, s loader.Sym, va uint64
return sect, n, va
}
+// On Wasm, we reserve 4096 bytes for zero page, then 4096 bytes for wasm_exec.js
+// to store command line args. Data sections starts from at least address 8192.
+// Keep in sync with wasm_exec.js.
+const wasmMinDataAddr = 4096 + 4096
+
// address assigns virtual addresses to all segments and sections and
// returns all segments in file order.
func (ctxt *Link) address() []*sym.Segment {
@@ -2277,10 +2282,14 @@ func (ctxt *Link) address() []*sym.Segment {
order = append(order, &Segtext)
Segtext.Rwx = 05
Segtext.Vaddr = va
- for _, s := range Segtext.Sections {
+ for i, s := range Segtext.Sections {
va = uint64(Rnd(int64(va), int64(s.Align)))
s.Vaddr = va
va += s.Length
+
+ if ctxt.IsWasm() && i == 0 && va < wasmMinDataAddr {
+ va = wasmMinDataAddr
+ }
}
Segtext.Length = va - uint64(*FlagTextAddr)
From: Roland Shoemaker <roland@golang.org>
Date: Thu, 14 Oct 2021 13:02:01 -0700
Subject: CVE-2021-41771
Origin: backport, https://github.com/golang/go/commit/d19c5bdb
---
src/debug/macho/file.go | 9 +++++++++
src/debug/macho/file_test.go | 7 +++++++
.../macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64 | 1 +
3 files changed, 17 insertions(+)
create mode 100644 src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64
diff --git a/src/debug/macho/file.go b/src/debug/macho/file.go
index 085b0c8..73cfce3 100644
--- a/src/debug/macho/file.go
+++ b/src/debug/macho/file.go
@@ -345,6 +345,15 @@ func NewFile(r io.ReaderAt) (*File, error) {
if err := binary.Read(b, bo, &hdr); err != nil {
return nil, err
}
+ if hdr.Iundefsym > uint32(len(f.Symtab.Syms)) {
+ return nil, &FormatError{offset, fmt.Sprintf(
+ "undefined symbols index in dynamic symbol table command is greater than symbol table length (%d > %d)",
+ hdr.Iundefsym, len(f.Symtab.Syms)), nil}
+ } else if hdr.Iundefsym+hdr.Nundefsym > uint32(len(f.Symtab.Syms)) {
+ return nil, &FormatError{offset, fmt.Sprintf(
+ "number of undefined symbols after index in dynamic symbol table command is greater than symbol table length (%d > %d)",
+ hdr.Iundefsym+hdr.Nundefsym, len(f.Symtab.Syms)), nil}
+ }
dat := make([]byte, hdr.Nindirectsyms*4)
if _, err := r.ReadAt(dat, int64(hdr.Indirectsymoff)); err != nil {
return nil, err
diff --git a/src/debug/macho/file_test.go b/src/debug/macho/file_test.go
index 03915c8..9beeb80 100644
--- a/src/debug/macho/file_test.go
+++ b/src/debug/macho/file_test.go
@@ -416,3 +416,10 @@ func TestTypeString(t *testing.T) {
t.Errorf("got %v, want %v", TypeExec.GoString(), "macho.Exec")
}
}
+
+func TestOpenBadDysymCmd(t *testing.T) {
+ _, err := openObscured("testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64")
+ if err == nil {
+ t.Fatal("openObscured did not fail when opening a file with an invalid dynamic symbol table command")
+ }
+}
diff --git a/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64 b/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64
new file mode 100644
index 0000000..8e04366
--- /dev/null
+++ b/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64
@@ -0,0 +1 @@
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