package/tar: add upstream security patch for CVE-2022-48303

Fixes CVE-2022-48303: GNU Tar through 1.34 has a one-byte out-of-bounds read
that results in use of uninitialized memory for a conditional jump.
Exploitation to change the flow of control has not been demonstrated.  The
issue occurs in from_header in list.c via a V7 archive in which mtime has
approximately 11 whitespace characters.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
[Peter: add _IGNORE_CVES entry]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tar/0002-Fix-boundary-checking-in-base-256-decoder.patch

@@ -0,0 +1,33 @@
+From 3da78400eafcccb97e2f2fd4b227ea40d794ede8 Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Sat, 11 Feb 2023 11:57:39 +0200
+Subject: [PATCH] Fix boundary checking in base-256 decoder
+
+* src/list.c (from_header): Base-256 encoding is at least 2 bytes
+long.
+
+Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
+Upstream: https://git.savannah.gnu.org/cgit/tar.git/commit/?id=3da78400eafcccb97e2f2fd4b227ea40d794ede8
+---
+ src/list.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/src/list.c b/src/list.c
+index 9fafc425..86bcfdd1 100644
+--- a/src/list.c
++++ b/src/list.c
+@@ -881,8 +881,9 @@ from_header (char const *where0, size_t digs, char const *type,
+ 	  where++;
+ 	}
+     }
+-  else if (*where == '\200' /* positive base-256 */
+-	   || *where == '\377' /* negative base-256 */)
++  else if (where <= lim - 2
++	   && (*where == '\200' /* positive base-256 */
++	       || *where == '\377' /* negative base-256 */))
+     {
+       /* Parse base-256 output.  A nonnegative number N is
+ 	 represented as (256**DIGS)/2 + N; a negative number -N is
+-- 
+2.39.2
+

package/tar/tar.mk

@@ -14,6 +14,9 @@ TAR_LICENSE = GPL-3.0+
 TAR_LICENSE_FILES = COPYING
 TAR_CPE_ID_VENDOR = gnu
 
+# 0002-Fix-boundary-checking-in-base-256-decoder.patch
+TAR_IGNORE_CVES += CVE-2022-48303
+
 ifeq ($(BR2_PACKAGE_ACL),y)
 TAR_DEPENDENCIES += acl
 TAR_CONF_OPTS += --with-posix-acls