Package: release.debian.org
Severity: normal
Tags: bullseye
User: release.debian....@packages.debian.org
Usertags: pu
X-Debbugs-Cc: z...@debian.org, t...@security.debian.org
[ Reason ]
Backport patches for CVE-2021-38297 and CVE-2021-41771.
[ Impact ]
+ CVE-2021-38297 is for people using WASM with Go
+ CVE-2021-41771 is in debug/macho standard library
Both IMO only have limited users.
[ Tests ]
+ CVE-2021-38297 I didn't test the WASM part since it's unclear
how to test...
+ CVE-2021-41771 the upstream patch contains a bad binary to trigger
the issue in the unit test.
[ Risks ]
Both patches are taken from upstream 1.16 branch without modification.
And they are small except a big test file.
[ Checklist ]
[x] *all* changes are documented in the d/changelog
[x] I reviewed all changes and I approve them
[x] attach debdiff against the package in (old)stable
[x] the issue is verified as fixed in unstable
[ Changes ]
golang-1.15 (1.15.15-1~deb11u2) bullseye; urgency=medium
* 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
[ Other info ]
I don't think we need to rebuild all Go packages with the severity of these two
issues.
diff -Nru golang-1.15-1.15.15/debian/changelog
golang-1.15-1.15.15/debian/changelog
--- golang-1.15-1.15.15/debian/changelog 2021-09-11 15:54:07.000000000
+0800
+++ golang-1.15-1.15.15/debian/changelog 2021-12-04 17:37:57.000000000
+0800
@@ -1,3 +1,14 @@
+golang-1.15 (1.15.15-1~deb11u2) bullseye; urgency=medium
+
+ * 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
+
+ -- Shengjing Zhu <z...@debian.org> Sat, 04 Dec 2021 17:37:57 +0800
+
golang-1.15 (1.15.15-1~deb11u1) bullseye; urgency=medium
[ Anthony Fok ]
diff -Nru golang-1.15-1.15.15/debian/patches/0008-CVE-2021-38297.patch
golang-1.15-1.15.15/debian/patches/0008-CVE-2021-38297.patch
--- golang-1.15-1.15.15/debian/patches/0008-CVE-2021-38297.patch
1970-01-01 08:00:00.000000000 +0800
+++ golang-1.15-1.15.15/debian/patches/0008-CVE-2021-38297.patch
2021-12-04 17:37:57.000000000 +0800
@@ -0,0 +1,60 @@
+From: Michael Knyszek <mknys...@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)
diff -Nru golang-1.15-1.15.15/debian/patches/0009-CVE-2021-41771.patch
golang-1.15-1.15.15/debian/patches/0009-CVE-2021-41771.patch
--- golang-1.15-1.15.15/debian/patches/0009-CVE-2021-41771.patch
1970-01-01 08:00:00.000000000 +0800
+++ golang-1.15-1.15.15/debian/patches/0009-CVE-2021-41771.patch
2021-12-04 17:37:57.000000000 +0800
@@ -0,0 +1,55 @@
+From: Roland Shoemaker <rol...@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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+\ No newline at end of file
diff -Nru golang-1.15-1.15.15/debian/patches/series
golang-1.15-1.15.15/debian/patches/series
--- golang-1.15-1.15.15/debian/patches/series 2021-09-11 15:54:07.000000000
+0800
+++ golang-1.15-1.15.15/debian/patches/series 2021-12-04 17:37:57.000000000
+0800
@@ -5,3 +5,5 @@
0005-cmd-dist-increase-default-timeout-scale-for-arm.patch
0006-skip-userns-test-in-schroot-as-well.patch
0007-CVE-2021-39293.patch
+0008-CVE-2021-38297.patch
+0009-CVE-2021-41771.patch
