From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 95078CD5BAC for ; Thu, 21 May 2026 10:17:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xsJEfdjdSp338K+IP1dasVBlu2UlR0ryRzkAdf1kOjQ=; b=vLIG7o78h7iZ0qI+s171DvN7eQ vZDo85WJ51vLbmECa+TAW45d0PwpZkQutbQE6De4rM7MnhS0JP18m6b0AXBSC53fkICmg0kbQ3u5D o0bQ+I1wYw+24fF8LlCKuRdjcymEjxhQGTJNrQe/8ksqBMiNg3esPvkhmY/m2qCoBUBVP4tRr+uw5 NkNsVHqNQwdTbii5ZMoTleJ5fej+W/mFmOoGR3VRn+eOiq23epW7sim/AmBx+7DtjXgQe3+kBbhEB xGBRtvdj2B/qPPDLdo33v+BIH3+i2FQuPLarTIOUZ+h570wq1thU6qXcy8ksT0XUISXO5YvxpQj0Q OOD0EA0g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wQ0TF-00000007Qvb-1JVh; Thu, 21 May 2026 10:17:41 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wQ0TE-00000007Qv6-0Zxv for linux-arm-kernel@lists.infradead.org; Thu, 21 May 2026 10:17:40 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 93A1160172; Thu, 21 May 2026 10:17:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F6271F000E9; Thu, 21 May 2026 10:17:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779358659; bh=xsJEfdjdSp338K+IP1dasVBlu2UlR0ryRzkAdf1kOjQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=TNbDVWNu+W8zkMoaJcidGY1IqUcI4LoxZRzPPkfvMGnhxm0ihTNOJVlfbuVqsnXvG QZe69uzg4CtBBeq6xf4WAJFY2W+mrLWK86pOYeq4PGvQCCcpWeY7Ip5gBkJcl0YO/G bXKtindRJmdR1dqmrtjmmjhyTdqSDQ3n3vbOiKtfi4aZ7DIeWA6JXYINk0daL98yN6 7CoixUwEGwDvQ0r3slK4ol5kdwjxiockgmyiJvk2qAPHAeeLHouFWLve5HMGZX6nKg BkdS+6YKpl+rQCr334jcZZuVADsesAijXb6QIkMSmdaB7k2gzeXd2SKftGnwtP2m5s GnjXJG4pbfn2A== Message-ID: <2c2c82f5-21d2-4851-86c8-0dbc05537427@kernel.org> Date: Thu, 21 May 2026 12:17:34 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 11/12] crypto: atmel-sha204a - fix heap info leak on I2C transfer failure To: Lothar Rubusch , thorsten.blum@linux.dev, herbert@gondor.apana.org.au, davem@davemloft.net, nicolas.ferre@microchip.com, alexandre.belloni@bootlin.com, claudiu.beznea@tuxon.dev, tudor.ambarus@linaro.org, ardb@kernel.org, linusw@kernel.org Cc: linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260520155703.23018-1-l.rubusch@gmail.com> <20260520155703.23018-12-l.rubusch@gmail.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 20/05/2026 17:57, Lothar Rubusch wrote: > When a non-blocking read operation is requested, the driver dynamically > allocates memory to track asynchronous transfer status. If the underlying > I2C transmission fails, atmel_sha204a_rng_done() logs a rate-limited > warning but incorrectly proceeds to cache the pointer to this uninitialized > buffer inside the rng->priv data field anyway. > > On subsequent execution passes, atmel_sha204a_rng_read_nonblocking() > detects the stale rng->priv value, skips executing a hardware data read, > and copies up to 32 bytes of uninitialized kernel heap data from this > garbage memory pool straight back into the system's hwrng data stream. > > Fix this information disclosure vector by immediately releasing the > allocated asynchronous work data buffer and explicitly clearing the > tracking pointer context whenever an I2C transaction returns a non-zero > error status. > > Additionally, duplicate the tfm counter decrement within the new error > path to ensure the reference counter is properly released before executing > the early return, maintaining the driver's availability for subsequent > requests. > > Fixes: da001fb651b0 ("crypto: atmel-i2c - add support for SHA204A random number generator") This and other fixes should be first in the patchset. Or even separate patchset. Best regards, Krzysztof