nixpkgs/pkgs/tools/misc/mcrypt/segv.patch

From 5bee29fae8f0e936ad4c957aef6035d09532a57a Mon Sep 17 00:00:00 2001
From: Alon Bar-Lev <alon.barlev@gmail.com>
Date: Sat, 22 Dec 2012 22:04:27 +0200
Subject: [PATCH] cleanup: fixup segv on buffer access

use exact buffer size instead of guess.

do not copy out of source buffer.

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
---
 mcrypt-2.6.8/src/rfc2440.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/mcrypt-2.6.8/src/rfc2440.c b/mcrypt-2.6.8/src/rfc2440.c
index 5a1f296..929b9ab 100644
--- a/src/rfc2440.c
+++ b/src/rfc2440.c
@@ -497,7 +497,7 @@ plaintext_encode(const USTRING dat)
     time_t t;

     assert(dat->len > 0);
-    result = make_ustring( NULL,  2 * dat->len); /* xxx */
+    result = make_ustring( NULL,  dat->len + 12); /* xxx */
     newdat = (USTRING)dat;
     result->d[pos++] = (0x80 | 0x40 | PKT_PLAINTEXT);

@@ -810,7 +810,8 @@ encrypted_encode(const USTRING pt, const DEK *dek)
     _mcrypt_encrypt(dek->hd, rndpref, dek->blocklen + 2, NULL, 0);
     _mcrypt_sync(dek->hd, rndpref, dek->blocklen);

-    ct = make_ustring( rndpref,   2 * pt->len); /* xxx */
+    ct = make_ustring( NULL, dek->blocklen + 2 + pt->len + 12); /* xxx */
+    memcpy(ct->d, rndpref, dek->blocklen + 2);
     pos = dek->blocklen + 2;

     _mcrypt_encrypt(dek->hd, ct->d + pos, pt->len, pt->d, pt->len);
--
1.7.8.6