inetutils: Fix abort on invalid files

When the code is compiled with  "-fstack-protector-strong
-D_FORTIFY_SOURCE=2", everytime ftpfd is asked for a non existent file,
it crashes with the following error:

*** buffer overflow detected ***:
Aborted

This seems to be a bug/feature of gcc. A bug has been open on their
bugzilla, and also inetutils have been posted with the proposed patch.

Without this patch, pxelinux fails to boot because it keeps asking the
server for the pxelinux.cfg/00-01-02-03-04 and never jumps to /default.

(From OE-Core rev: 0c3a1251a8aec86f3e877130f926a928e5ca2030)

Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 26 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/inetutils/inetutils/fix-buffer-fortify-tfpt.patch b/meta/recipes-connectivity/inetutils/inetutils/fix-buffer-fortify-tfpt.patch
new file mode 100644
index 0000000000..a91913cb51
--- /dev/null
+++ b/meta/recipes-connectivity/inetutils/inetutils/fix-buffer-fortify-tfpt.patch
@@ -0,0 +1,25 @@
+tftpd: Fix abort on error path
+
+When trying to fetch a non existent file, the app crashes with:
+
+*** buffer overflow detected ***: 
+Aborted
+
+
+Upstream-Status: Submitted [https://www.mail-archive.com/bug-inetutils@gnu.org/msg03036.html https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91205]
+Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
+diff --git a/src/tftpd.c b/src/tftpd.c
+index 56002a0..144012f 100644
+--- a/src/tftpd.c
++++ b/src/tftpd.c
+@@ -864,9 +864,8 @@ nak (int error)
+       pe->e_msg = strerror (error - 100);
+       tp->th_code = EUNDEF;    /* set 'undef' errorcode */
+     }
+-  strcpy (tp->th_msg, pe->e_msg);
+   length = strlen (pe->e_msg);
+-  tp->th_msg[length] = '\0';
++  memcpy(tp->th_msg, pe->e_msg, length + 1);
+   length += 5;
+   if (sendto (peer, buf, length, 0, (struct sockaddr *) &from, fromlen) != length)
+     syslog (LOG_ERR, "nak: %m\n");
diff --git a/meta/recipes-connectivity/inetutils/inetutils_1.9.4.bb b/meta/recipes-connectivity/inetutils/inetutils_1.9.4.bb
index ac2e017d8b..684fbe09e1 100644
--- a/meta/recipes-connectivity/inetutils/inetutils_1.9.4.bb
+++ b/meta/recipes-connectivity/inetutils/inetutils_1.9.4.bb
@@ -22,6 +22,7 @@ SRC_URI = "${GNU_MIRROR}/inetutils/inetutils-${PV}.tar.gz \
            file://inetutils-1.9-PATH_PROCNET_DEV.patch \
            file://inetutils-only-check-pam_appl.h-when-pam-enabled.patch \
            file://0001-rcp-fix-to-work-with-large-files.patch \
+           file://fix-buffer-fortify-tfpt.patch \
 "
 
 SRC_URI[md5sum] = "04852c26c47cc8c6b825f2b74f191f52"