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