Compare commits
No commits in common. 'c9' and 'c8-stream-5.24' have entirely different histories.
c9
...
c8-stream-
@ -1,79 +0,0 @@
|
|||||||
From 159042c71bbdd5909f792208dcdffffb1674ecfe Mon Sep 17 00:00:00 2001
|
|
||||||
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
|
|
||||||
Date: Thu, 19 Aug 2021 16:07:06 +0200
|
|
||||||
Subject: [PATCH] Fix a crash in gss_release_oid() when destructing out_mech
|
|
||||||
returned by gss_accept_sec_context()
|
|
||||||
MIME-Version: 1.0
|
|
||||||
Content-Type: text/plain; charset=UTF-8
|
|
||||||
Content-Transfer-Encoding: 8bit
|
|
||||||
|
|
||||||
If Perl GSSAPI was built against MIT krb5, an example gss-server.pl
|
|
||||||
script crashed like this:
|
|
||||||
|
|
||||||
Program terminated with signal SIGSEGV, Segmentation fault.
|
|
||||||
#0 0x00007f27f3d48b23 in __GI___libc_free (mem=<optimized out>)
|
|
||||||
at malloc.c:3131
|
|
||||||
3131 ar_ptr = arena_for_chunk (p);
|
|
||||||
(gdb) bt
|
|
||||||
#0 0x00007f27f3d48b23 in __GI___libc_free (mem=<optimized out>)
|
|
||||||
at malloc.c:3131
|
|
||||||
#1 0x00007f27f2fe17c6 in generic_gss_release_oid (
|
|
||||||
minor_status=minor_status@entry=0x7fffc750333c,
|
|
||||||
oid=oid@entry=0x7fffc7503340) at oid_ops.c:102
|
|
||||||
#2 0x00007f27f2fee6df in gss_release_oid (
|
|
||||||
minor_status=minor_status@entry=0x7fffc750333c,
|
|
||||||
oid=oid@entry=0x7fffc7503340) at g_initialize.c:202
|
|
||||||
#3 0x00007f27f322f5cf in XS_GSSAPI__OID_DESTROY (my_perl=<optimized out>,
|
|
||||||
cv=0x564037c87130) at ./xs/OID.xs:24
|
|
||||||
#4 0x00007f27f4f58149 in Perl_pp_entersub (my_perl=0x5640378d42a0)
|
|
||||||
at pp_hot.c:4227
|
|
||||||
|
|
||||||
The cause is that gss_accept_sec_context() returns a pointer to
|
|
||||||
a static storage in out_mech argument. When GSSAPI passed out_mech to
|
|
||||||
a desctructor, the invoked gss_release_oid() crashed when freeing the
|
|
||||||
memory.
|
|
||||||
|
|
||||||
Accoding to RFC 2744, the static storage is correct. Hence the flaw is
|
|
||||||
on Perl GSSAPI side. This patch fixes it by copying the out_mech OID
|
|
||||||
object on a heap which is then correctly processed by
|
|
||||||
gss_release_oid().
|
|
||||||
|
|
||||||
CPAN RT#121873.
|
|
||||||
|
|
||||||
Signed-off-by: Petr Písař <ppisar@redhat.com>
|
|
||||||
---
|
|
||||||
xs/Context.xs | 18 ++++++++++++++++++
|
|
||||||
1 file changed, 18 insertions(+)
|
|
||||||
|
|
||||||
diff --git a/xs/Context.xs b/xs/Context.xs
|
|
||||||
index d176f08..4549595 100644
|
|
||||||
--- a/xs/Context.xs
|
|
||||||
+++ b/xs/Context.xs
|
|
||||||
@@ -80,6 +80,24 @@ accept(context, acc_cred, in_token, binding, out_name, out_mech, out_token, out_
|
|
||||||
&in_token, binding, out_name, out_mech,
|
|
||||||
&out_token, out_flags, out_time,
|
|
||||||
delegated_cred);
|
|
||||||
+#if !defined(HEIMDAL)
|
|
||||||
+ if (out_mech && *out_mech) {
|
|
||||||
+ /* RFC 2744 documents that the returned *out_mech is a pointer
|
|
||||||
+ * to static data. To prevent from freeing them when destructing
|
|
||||||
+ * out_mech, we change *out_mech into a pointer to a heap-allocated
|
|
||||||
+ * buffer with the same content. Otherwise, MITKRB5-provided
|
|
||||||
+ * gss_release_oid() deallocator which cannot recognize this static
|
|
||||||
+ * storage would crash. We use malloc() because gss_release_oid() used
|
|
||||||
+ * free(). */
|
|
||||||
+ GSSAPI__OID copy = malloc(sizeof(*copy));
|
|
||||||
+ if (!copy) croak("Not enough memory for copying out_mech!");
|
|
||||||
+ copy->elements = malloc((*out_mech)->length);
|
|
||||||
+ if (!copy->elements) croak("Not enough memory for copying out_mech!");
|
|
||||||
+ memcpy(copy->elements, (*out_mech)->elements, (*out_mech)->length);
|
|
||||||
+ copy->length = (*out_mech)->length;
|
|
||||||
+ *out_mech = copy;
|
|
||||||
+ }
|
|
||||||
+#endif
|
|
||||||
OUTPUT:
|
|
||||||
RETVAL
|
|
||||||
context
|
|
||||||
--
|
|
||||||
2.31.1
|
|
||||||
|
|
||||||
Loading…
Reference in new issue