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commit 7b5d433fd097b8ed74e458eca33597290e07b974
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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-2022-23219: Buffer overflow in sunrpc clnt_create for "unix" (bug 22542)
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Processing an overlong pathname in the sunrpc clnt_create function
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results in a stack-based buffer overflow.
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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(cherry picked from commit 226b46770c82899b555986583294b049c6ec9b40)
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diff --git a/sunrpc/clnt_gen.c b/sunrpc/clnt_gen.c
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index 13ced8994e49d4ee..b44357cd88e60599 100644
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--- a/sunrpc/clnt_gen.c
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+++ b/sunrpc/clnt_gen.c
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@@ -57,9 +57,13 @@ clnt_create (const char *hostname, u_long prog, u_long vers,
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if (strcmp (proto, "unix") == 0)
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{
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- memset ((char *)&sun, 0, sizeof (sun));
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- sun.sun_family = AF_UNIX;
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- strcpy (sun.sun_path, hostname);
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+ if (__sockaddr_un_set (&sun, hostname) < 0)
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+ {
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+ struct rpc_createerr *ce = &get_rpc_createerr ();
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+ ce->cf_stat = RPC_SYSTEMERROR;
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+ ce->cf_error.re_errno = errno;
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+ return NULL;
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+ }
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sock = RPC_ANYSOCK;
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client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
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if (client == NULL)
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