gdb: Fix CVE-2023-39128

Note: The Fix needs to be pushed in gdb rather than bintuils-gdb as we are
disabling gdb in binutils configure.

Upstream-Status: Backport from [https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=033bc52bb6190393c8eed80925fa78cc35b40c6d]
CVE: CVE-2023-39128
Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gdb/gdb.inc b/meta/recipes-devtools/gdb/gdb.inc
index 649ee28727..099bd2d8f5 100644
--- a/meta/recipes-devtools/gdb/gdb.inc
+++ b/meta/recipes-devtools/gdb/gdb.inc
@@ -14,5 +14,6 @@ SRC_URI = "${GNU_MIRROR}/gdb/gdb-${PV}.tar.xz \
            file://0008-resolve-restrict-keyword-conflict.patch \
            file://0009-Fix-invalid-sigprocmask-call.patch \
            file://0010-gdbserver-ctrl-c-handling.patch \
+           file://0011-CVE-2023-39128.patch \
            "
 SRC_URI[sha256sum] = "1497c36a71881b8671a9a84a0ee40faab788ca30d7ba19d8463c3cc787152e32"
diff --git a/meta/recipes-devtools/gdb/gdb/0011-CVE-2023-39128.patch b/meta/recipes-devtools/gdb/gdb/0011-CVE-2023-39128.patch
new file mode 100644
index 0000000000..53b49cb21d
--- /dev/null
+++ b/meta/recipes-devtools/gdb/gdb/0011-CVE-2023-39128.patch
@@ -0,0 +1,75 @@
+From 033bc52bb6190393c8eed80925fa78cc35b40c6d Mon Sep 17 00:00:00 2001
+From: Tom Tromey <tromey@adacore.com>
+Date: Wed, 16 Aug 2023 11:29:19 -0600
+Subject: [PATCH] Avoid buffer overflow in ada_decode
+
+A bug report pointed out a buffer overflow in ada_decode, which Keith
+helpfully analyzed.  ada_decode had a logic error when the input was
+all digits.  While this isn't valid -- and would probably only appear
+in fuzzer tests -- it still should be handled properly.
+
+This patch adds a missing bounds check.  Tested with the self-tests in
+an asan build.
+
+Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30639
+Reviewed-by: Keith Seitz <keiths@redhat.com>
+
+Upstream-Status: Backport from [https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=033bc52bb6190393c8eed80925fa78cc35b40c6d]   
+CVE: CVE-2023-39128
+Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
+---
+ gdb/ada-lang.c | 19 ++++++++++++++++++-
+ 1 file changed, 18 insertions(+), 1 deletion(-)
+
+diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
+index 70a2b44..f682302 100644
+--- a/gdb/ada-lang.c
++++ b/gdb/ada-lang.c
+@@ -57,6 +57,7 @@
+ #include "cli/cli-utils.h"
+ #include "gdbsupport/function-view.h"
+ #include "gdbsupport/byte-vector.h"
++#include "gdbsupport/selftest.h"
+ #include <algorithm>
+ #include "ada-exp.h"
+ 
+@@ -1057,7 +1058,7 @@ ada_decode (const char *encoded, bool wrap)
+ 	i -= 1;
+       if (i > 1 && encoded[i] == '_' && encoded[i - 1] == '_')
+ 	len0 = i - 1;
+-      else if (encoded[i] == '$')
++      else if (i >= 0 && encoded[i] == '$')
+ 	len0 = i;
+     }
+ 
+@@ -1225,6 +1226,18 @@ ada_decode (const char *encoded, bool wrap)
+   return decoded;
+ }
+ 
++#ifdef GDB_SELF_TEST
++
++static void
++ada_decode_tests ()
++{
++  /* This isn't valid, but used to cause a crash.  PR gdb/30639.  The
++     result does not really matter very much.  */
++  SELF_CHECK (ada_decode ("44") == "44");
++}
++
++#endif
++
+ /* Table for keeping permanent unique copies of decoded names.  Once
+    allocated, names in this table are never released.  While this is a
+    storage leak, it should not be significant unless there are massive
+@@ -13497,4 +13510,8 @@ DWARF attribute."),
+   gdb::observers::new_objfile.attach (ada_new_objfile_observer, "ada-lang");
+   gdb::observers::free_objfile.attach (ada_free_objfile_observer, "ada-lang");
+   gdb::observers::inferior_exit.attach (ada_inferior_exit, "ada-lang");
++
++#ifdef GDB_SELF_TEST
++  selftests::register_test ("ada-decode", ada_decode_tests);
++#endif
+ }
+-- 
+2.35.7
+