tar: Fix for CVE-2023-39804

Upstream-Status: Backport from https://git.savannah.gnu.org/cgit/tar.git/commit/?id=a339f05cd269013fa133d2f148d73f6f7d4247e4

(From OE-Core rev: 082c31db387957963952c485a436dc38a64498d0)

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-extended/tar/tar/CVE-2023-39804.patch

@@ -0,0 +1,64 @@
+From a339f05cd269013fa133d2f148d73f6f7d4247e4 Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Sat, 28 Aug 2021 16:02:12 +0300
+Subject: Fix handling of extended header prefixes
+
+* src/xheader.c (locate_handler): Recognize prefix keywords only
+when followed by a dot.
+(xattr_decoder): Use xmalloc/xstrdup instead of alloc
+
+Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/tar.git/commit/?id=a339f05cd269013fa133d2f148d73f6f7d4247e4]
+CVE: CVE-2023-39804
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ src/xheader.c | 17 +++++++++--------
+ 1 file changed, 9 insertions(+), 8 deletions(-)
+
+diff --git a/src/xheader.c b/src/xheader.c
+index 4f8b2b2..3cd694d 100644
+--- a/src/xheader.c
++++ b/src/xheader.c
+@@ -637,11 +637,11 @@ static struct xhdr_tab const *
+ locate_handler (char const *keyword)
+ {
+   struct xhdr_tab const *p;
+-
+   for (p = xhdr_tab; p->keyword; p++)
+     if (p->prefix)
+       {
+-        if (strncmp (p->keyword, keyword, strlen(p->keyword)) == 0)
++	size_t kwlen = strlen (p->keyword);
++        if (keyword[kwlen] == '.' && strncmp (p->keyword, keyword, kwlen) == 0)
+           return p;
+       }
+     else
+@@ -1716,19 +1716,20 @@ xattr_decoder (struct tar_stat_info *st,
+                char const *keyword, char const *arg, size_t size)
+ {
+   char *xstr, *xkey;
+-
++  
+   /* copy keyword */
+-  size_t klen_raw = strlen (keyword);
+-  xkey = alloca (klen_raw + 1);
+-  memcpy (xkey, keyword, klen_raw + 1) /* including null-terminating */;
++  xkey = xstrdup (keyword);
+ 
+   /* copy value */
+-  xstr = alloca (size + 1);
++  xstr = xmalloc (size + 1);
+   memcpy (xstr, arg, size + 1); /* separator included, for GNU tar '\n' */;
+ 
+   xattr_decode_keyword (xkey);
+ 
+-  xheader_xattr_add (st, xkey + strlen("SCHILY.xattr."), xstr, size);
++  xheader_xattr_add (st, xkey + strlen ("SCHILY.xattr."), xstr, size);
++
++  free (xkey);
++  free (xstr);
+ }
+ 
+ static void
+-- 
+cgit v1.1
+

meta/recipes-extended/tar/tar_1.32.bb

@@ -10,6 +10,7 @@ SRC_URI = "${GNU_MIRROR}/tar/tar-${PV}.tar.bz2 \
            file://musl_dirent.patch \
            file://CVE-2021-20193.patch \
            file://CVE-2022-48303.patch \
+           file://CVE-2023-39804.patch \
 "
 
 SRC_URI[md5sum] = "17917356fff5cb4bd3cd5a6c3e727b05"