You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
3.3 KiB
102 lines
3.3 KiB
9 months ago
|
commit f545ad4928fa1f27a3075265182b38a4f939a5f7
|
||
|
|
Author: Florian Weimer <fweimer@redhat.com>
|
||
|
|
Date: Mon Jan 17 10:21:34 2022 +0100
|
||
|
|
|
||
|
|
CVE-2022-23218: Buffer overflow in sunrpc svcunix_create (bug 28768)
|
||
|
|
|
||
|
|
The sunrpc function svcunix_create suffers from a stack-based buffer
|
||
|
|
overflow with overlong pathname arguments.
|
||
|
|
|
||
|
|
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
|
||
|
|
|
||
|
|
diff --git a/sunrpc/Makefile b/sunrpc/Makefile
|
||
|
|
index 2f8f0597c99e117f..5f7087aee494cc2e 100644
|
||
|
|
--- a/sunrpc/Makefile
|
||
|
|
+++ b/sunrpc/Makefile
|
||
|
|
@@ -95,7 +95,7 @@ others += rpcgen
|
||
|
|
endif
|
||
|
|
|
||
|
|
tests = tst-xdrmem tst-xdrmem2 test-rpcent tst-udp-error tst-udp-timeout \
|
||
|
|
- tst-udp-nonblocking tst-bug22542
|
||
|
|
+ tst-udp-nonblocking tst-bug22542 tst-bug28768
|
||
|
|
|
||
|
|
xtests := tst-getmyaddr
|
||
|
|
|
||
|
|
diff --git a/sunrpc/svc_unix.c b/sunrpc/svc_unix.c
|
||
|
|
index c2c076aa87f0a2ad..8fac2b35da1d38a5 100644
|
||
|
|
--- a/sunrpc/svc_unix.c
|
||
|
|
+++ b/sunrpc/svc_unix.c
|
||
|
|
@@ -154,7 +154,10 @@ svcunix_create (int sock, u_int sendsize, u_int recvsize, char *path)
|
||
|
|
SVCXPRT *xprt;
|
||
|
|
struct unix_rendezvous *r;
|
||
|
|
struct sockaddr_un addr;
|
||
|
|
- socklen_t len = sizeof (struct sockaddr_in);
|
||
|
|
+ socklen_t len = sizeof (addr);
|
||
|
|
+
|
||
|
|
+ if (__sockaddr_un_set (&addr, path) < 0)
|
||
|
|
+ return NULL;
|
||
|
|
|
||
|
|
if (sock == RPC_ANYSOCK)
|
||
|
|
{
|
||
|
|
@@ -165,12 +168,6 @@ svcunix_create (int sock, u_int sendsize, u_int recvsize, char *path)
|
||
|
|
}
|
||
|
|
madesock = TRUE;
|
||
|
|
}
|
||
|
|
- memset (&addr, '\0', sizeof (addr));
|
||
|
|
- addr.sun_family = AF_UNIX;
|
||
|
|
- len = strlen (path) + 1;
|
||
|
|
- memcpy (addr.sun_path, path, len);
|
||
|
|
- len += sizeof (addr.sun_family);
|
||
|
|
-
|
||
|
|
__bind (sock, (struct sockaddr *) &addr, len);
|
||
|
|
|
||
|
|
if (__getsockname (sock, (struct sockaddr *) &addr, &len) != 0
|
||
|
|
diff --git a/sunrpc/tst-bug28768.c b/sunrpc/tst-bug28768.c
|
||
|
|
new file mode 100644
|
||
|
|
index 0000000000000000..35a4b7b0b3d34350
|
||
|
|
--- /dev/null
|
||
|
|
+++ b/sunrpc/tst-bug28768.c
|
||
|
|
@@ -0,0 +1,42 @@
|
||
|
|
+/* Test to verify that long path is rejected by svcunix_create (bug 28768).
|
||
|
|
+ Copyright (C) 2022 Free Software Foundation, Inc.
|
||
|
|
+ This file is part of the GNU C Library.
|
||
|
|
+
|
||
|
|
+ The GNU C Library is free software; you can redistribute it and/or
|
||
|
|
+ modify it under the terms of the GNU Lesser General Public
|
||
|
|
+ License as published by the Free Software Foundation; either
|
||
|
|
+ version 2.1 of the License, or (at your option) any later version.
|
||
|
|
+
|
||
|
|
+ The GNU C Library is distributed in the hope that it will be useful,
|
||
|
|
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
+ Lesser General Public License for more details.
|
||
|
|
+
|
||
|
|
+ You should have received a copy of the GNU Lesser General Public
|
||
|
|
+ License along with the GNU C Library; if not, see
|
||
|
|
+ <http://www.gnu.org/licenses/>. */
|
||
|
|
+
|
||
|
|
+#include <errno.h>
|
||
|
|
+#include <rpc/svc.h>
|
||
|
|
+#include <shlib-compat.h>
|
||
|
|
+#include <string.h>
|
||
|
|
+#include <support/check.h>
|
||
|
|
+
|
||
|
|
+/* svcunix_create does not have a default version in linkobj/libc.so. */
|
||
|
|
+compat_symbol_reference (libc, svcunix_create, svcunix_create, GLIBC_2_1);
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+do_test (void)
|
||
|
|
+{
|
||
|
|
+ char pathname[109];
|
||
|
|
+ memset (pathname, 'x', sizeof (pathname));
|
||
|
|
+ pathname[sizeof (pathname) - 1] = '\0';
|
||
|
|
+
|
||
|
|
+ errno = 0;
|
||
|
|
+ TEST_VERIFY (svcunix_create (RPC_ANYSOCK, 4096, 4096, pathname) == NULL);
|
||
|
|
+ TEST_COMPARE (errno, EINVAL);
|
||
|
|
+
|
||
|
|
+ return 0;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+#include <support/test-driver.c>
|