busybox: Add fix for CVE-2023-42366

(From OE-Core rev: 25554f0a542894416ad17e1334c8a05feb56b12e)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Guðni Már Gilbert <gudni.m.g@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-core/busybox/busybox/0001-awk.c-fix-CVE-2023-42366-bug-15874.patch

@@ -0,0 +1,37 @@
+From 8542236894a8d5f7393327117bc7f64787444efc Mon Sep 17 00:00:00 2001
+From: Valery Ushakov <uwe@stderr.spb.ru>
+Date: Wed, 24 Jan 2024 22:24:41 +0300
+Subject: [PATCH] awk.c: fix CVE-2023-42366 (bug #15874)
+
+Make sure we don't read past the end of the string in next_token()
+when backslash is the last character in an (invalid) regexp.
+a fix and issue reported in bugzilla
+
+https://bugs.busybox.net/show_bug.cgi?id=15874
+
+Upstream-Status: Submitted [http://lists.busybox.net/pipermail/busybox/2024-May/090766.html]
+
+CVE: CVE-2023-42366
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ editors/awk.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/editors/awk.c b/editors/awk.c
+index f320d8c..a53b193 100644
+--- a/editors/awk.c
++++ b/editors/awk.c
+@@ -1168,9 +1168,11 @@ static uint32_t next_token(uint32_t expected)
+ 					s[-1] = bb_process_escape_sequence((const char **)&pp);
+ 					if (*p == '\\')
+ 						*s++ = '\\';
+-					if (pp == p)
++					if (pp == p) {
++						if (*p == '\0')
++							syntax_error(EMSG_UNEXP_EOS);
+ 						*s++ = *p++;
+-					else
++					} else
+ 						p = pp;
+ 				}
+ 			}

meta/recipes-core/busybox/busybox_1.36.1.bb

@@ -55,6 +55,7 @@ SRC_URI = "https://busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \
            file://CVE-2023-42363.patch \
            file://0001-awk-fix-precedence-of-relative-to.patch \
            file://0002-awk-fix-ternary-operator-and-precedence-of.patch \
+           file://0001-awk.c-fix-CVE-2023-42366-bug-15874.patch \
            "
 SRC_URI:append:libc-musl = " file://musl.cfg "
 # TODO http://lists.busybox.net/pipermail/busybox/2023-January/090078.html