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From d19c5bdb24e093a2d5097b7623284eb02726cede Mon Sep 17 00:00:00 2001
From: Roland Shoemaker <roland@golang.org>
Date: Thu, 14 Oct 2021 13:02:01 -0700
Subject: [PATCH] [release-branch.go1.16] debug/macho: fail on invalid dynamic
symbol table command
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fail out when loading a file that contains a dynamic symbol table
command that indicates a larger number of symbols than exist in the
loaded symbol table.
Thanks to Burak Çarıkçı - Yunus Yıldırım (CT-Zer0 Crypttech) for
reporting this issue.
Updates #48990
Fixes #48991
Fixes CVE-2021-41771
Change-Id: Ic3d6e6529241afcc959544b326b21b663262bad5
Reviewed-on: https://go-review.googlesource.com/c/go/+/355990
Reviewed-by: Julie Qiu <julie@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Katie Hockman <katie@golang.org>
(cherry picked from commit 61536ec03063b4951163bd09609c86d82631fa27)
Reviewed-on: https://go-review.googlesource.com/c/go/+/359454
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
https://github.com/golang/go/commit/d19c5bdb24e093a2d5097b7623284eb02726cede
CVE: CVE-2021-41771
Upstream-Status: Backport
Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
---
src/debug/macho/file.go | 9 +++++++++
src/debug/macho/file_test.go | 7 +++++++
.../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 085b0c8219bad..73cfce3c7606e 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 03915c86e23d9..9beeb80dd27c1 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 0000000000000..8e0436639c109
--- /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
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