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 03BA94A02 for ; Thu, 21 Nov 2024 14:33:21 +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=1732199602; cv=none; b=YAcCnVYuWBgdcGQVcKO8NRgQclyURrNZmJWEwq2JRTunXUeOeaSTT106Y5kPgdmrTMdd1RIOe/686AiKJIf2sLvxVTrWTLrmtI4DiqyYsCTMO2hHva1X9fvbuTLZq1bV/zvn3w2Fa8hOtQLoaWiutIIS6oHGVXo3vAIU6dHNcn0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732199602; c=relaxed/simple; bh=oHMJpJymB6/fAic/BoH3LDAeQ015R0FPilusKAakpcE=; h=Date:From:To:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=BavilDyDKIxyvJkD0RoSdZMcfaMV3+fK6byuVCVAmposYAwc6p165wnOwPiepg/A0hUnQn48FgazgolbyL8Azh9ckwaAWv2dPb4igTd77uxVn65vPE/fUXiwhzO2gaOSvIC8d3daVXCU4KRO1f0lN1yuTh+Ny5UzHxlYe9olr1k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oozT5wUp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="oozT5wUp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6DC5CC4CECC; Thu, 21 Nov 2024 14:33:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732199601; bh=oHMJpJymB6/fAic/BoH3LDAeQ015R0FPilusKAakpcE=; h=Date:From:To:Subject:From; b=oozT5wUpy85M7wImQFIG0s9KUI43lhlZXxK/SLMSilXrBul8BWyd+pdyXyzNp+/+7 +eQbwI9I+p1AyFytBatafnHa3lDNqw6W5/+dg3x626xXaqpDBYFbzEtvff6hjsWCyW VerSWzOS/2c7yAgtzNGjQ8ifqDFmOPVkxHZslrbvQQpKQPNSSksBtHCbdBLRWHN9im dbbnRNsA3bIrSMQSTTX0sltzYpdrD2yMQRMBJY2n8aWewqejuRQmMJD+VOnuRSE1SC am0L46HtzX9raZ59/DS6w3o0stMmW+/RMcMJww+b+mfg952KjHZRN1tFIgN2a8dFF4 emzGj0jz7S9hA== Date: Thu, 21 Nov 2024 06:33:18 -0800 From: Kees Cook To: stable@vger.kernel.org, Dominique Martinet Subject: please revert backport of 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d Message-ID: <202411210628.ECF1B494D7@keescook> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi stable tree maintainers, Please revert the backports of 44c76825d6ee ("x86: Increase brk randomness entropy for 64-bit systems") namely: 5.4: 03475167fda50b8511ef620a27409b08365882e1 5.10: 25d31baf922c1ee987efd6fcc9c7d4ab539c66b4 5.15: 06cb3463aa58906cfff72877eb7f50cb26e9ca93 6.1: b0cde867b80a5e81fcbc0383e138f5845f2005ee 6.6: 1a45994fb218d93dec48a3a86f68283db61e0936 There seems to be a bad interaction between this change and older PIE-built qemu-user-static (for aarch64) binaries[1]. Investigation continues to see if this will need to be reverted from 6.6, 6.11, and mainline. But for now, it's clearly a problem for older kernels with older qemu. Thanks! -Kees [1] https://lore.kernel.org/all/202411201000.F3313C02@keescook/ -- Kees Cook