From d19c5bdb24e093a2d5097b7623284eb02726cede Mon Sep 17 00:00:00 2001 From: Roland Shoemaker Date: Thu, 14 Oct 2021 13:02:01 -0700 Subject: [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 Reviewed-by: Katie Hockman Reviewed-by: Emmanuel Odeke Run-TryBot: Roland Shoemaker TryBot-Result: Go Bot Trust: Katie Hockman (cherry picked from commit 61536ec03063b4951163bd09609c86d82631fa27) Reviewed-on: https://go-review.googlesource.com/c/go/+/359454 Reviewed-by: Dmitri Shuralyov --- 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 085b0c8219b..73cfce3c760 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 03915c86e23..9beeb80dd27 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 00000000000..8e0436639c1 --- /dev/null +++ b/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64 @@ -0,0 +1 @@ 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