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
(From OE-Core rev: c991fdbb63a6de754399ac4fe04288ea66d34c4d)

Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-devtools/gdb/gdb-9.1.inc

@@ -16,6 +16,7 @@ SRC_URI = "${GNU_MIRROR}/gdb/gdb-${PV}.tar.xz \
            file://0009-resolve-restrict-keyword-conflict.patch \
            file://0010-Fix-invalid-sigprocmask-call.patch \
            file://0011-gdbserver-ctrl-c-handling.patch \
+           file://0012-CVE-2023-39128.patch \
            "
 SRC_URI[md5sum] = "f7e9f6236c425097d9e5f18a6ac40655"
 SRC_URI[sha256sum] = "699e0ec832fdd2f21c8266171ea5bf44024bd05164fdf064e4d10cc4cf0d1737"

meta/recipes-devtools/gdb/gdb/0012-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 0c2d4fc..40852b6 100644
+--- a/gdb/ada-lang.c
++++ b/gdb/ada-lang.c
+@@ -56,6 +56,7 @@
+ #include "cli/cli-utils.h"
+ #include "gdbsupport/function-view.h"
+ #include "gdbsupport/byte-vector.h"
++#include "gdbsupport/selftest.h"
+ #include <algorithm>
+ 
+ /* Define whether or not the C operator '/' truncates towards zero for
+@@ -1184,7 +1185,7 @@ ada_decode (const char *encoded)
+         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;
+     }
+ 
+@@ -1350,6 +1351,18 @@ Suppress:
+ 
+ }
+ 
++#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
+@@ -14345,4 +14358,8 @@ DWARF attribute."),
+   gdb::observers::new_objfile.attach (ada_new_objfile_observer);
+   gdb::observers::free_objfile.attach (ada_free_objfile_observer);
+   gdb::observers::inferior_exit.attach (ada_inferior_exit);
++
++#ifdef GDB_SELF_TEST
++  selftests::register_test ("ada-decode", ada_decode_tests);
++#endif
+ }
+-- 
+2.24.4
+