From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 52FA2345758; Tue, 26 Aug 2025 13:46:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756216011; cv=none; b=dGO7VzWHR5cxWrpUoCpmrFxDPgRDnbmyNrs00nhWBWkEIg9y0j7Dh1Guc6YDiTI61vJ2qXmFayliIF3NKmihxJvC0wcGRjKDUWLIOBskChwbZdT43QC+pTXuhxrrojZh5vMZEMSl+a1btqN+/a+UU0/nLd3gY/iYjbi0Pv+yCHc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756216011; c=relaxed/simple; bh=hDYs+ju9iQLbH1FEAsxCAsS+uBluifoVMPdaFBY+IY8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AL7YiH1Gwuc9f4knXBI2iJbTfbqsnAbx/Os04q3qTStMQVGTy7SzoiUgPIzlvivnk06XjIXsT/rub1+8+6j7EjVlkOB+RIK9PHq/xrFESY5LxDL4LbTHkIx+vQ4um3K5MirujcgTg4+9JrUQte6KbKbTPCXPNtzwk1ZZzfjJssk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xJooRzhe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xJooRzhe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE1DAC113CF; Tue, 26 Aug 2025 13:46:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756216011; bh=hDYs+ju9iQLbH1FEAsxCAsS+uBluifoVMPdaFBY+IY8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xJooRzhe1pMiZnlHin9pe3Zz5EeQJrLdR1a8fnEQnBqvG3meGPQIndbEnvb5Z2StT Nbgu2zVVo5cb3emh+OjpB8gmG7FctVT/za3IdesiFlDTFc6y3H2owvh/5Ak9lTCiIO CPrQN/3sneLuhIXhBSZY2IUeTwzCi33wam50iMFY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Budimir Markovic , Stefano Garzarella , Jakub Kicinski Subject: [PATCH 5.15 250/644] vsock: Do not allow binding to VMADDR_PORT_ANY Date: Tue, 26 Aug 2025 13:05:41 +0200 Message-ID: <20250826110952.584407943@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110946.507083938@linuxfoundation.org> References: <20250826110946.507083938@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Budimir Markovic commit aba0c94f61ec05315fa7815d21aefa4c87f6a9f4 upstream. It is possible for a vsock to autobind to VMADDR_PORT_ANY. This can cause a use-after-free when a connection is made to the bound socket. The socket returned by accept() also has port VMADDR_PORT_ANY but is not on the list of unbound sockets. Binding it will result in an extra refcount decrement similar to the one fixed in fcdd2242c023 (vsock: Keep the binding until socket destruction). Modify the check in __vsock_bind_connectible() to also prevent binding to VMADDR_PORT_ANY. Fixes: d021c344051a ("VSOCK: Introduce VM Sockets") Reported-by: Budimir Markovic Signed-off-by: Budimir Markovic Reviewed-by: Stefano Garzarella Link: https://patch.msgid.link/20250807041811.678-1-markovicbudimir@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/vmw_vsock/af_vsock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -683,7 +683,8 @@ static int __vsock_bind_connectible(stru unsigned int i; for (i = 0; i < MAX_PORT_RETRIES; i++) { - if (port <= LAST_RESERVED_PORT) + if (port == VMADDR_PORT_ANY || + port <= LAST_RESERVED_PORT) port = LAST_RESERVED_PORT + 1; new_addr.svm_port = port++;