From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-659992-1519839459-2-7939093518447798839 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.249, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='uk', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1519839458; b=gX3aaz0BPYEIx+OFmpg3zryAghC+ycozpIka+nonYtqRCb7 cQ03UKJqTtHR+gG2P8UYGr9vU2XCVgJAXuTajdlZn8/Jh9vMrAbMqQ6cy9CKlgpp tnGyIH+pUJxCQjSljYtneS6RPgOiFOg5ziqmW7159JkD2lpjOeIsoqWDOt5a2Xxc WueJGnc7YSbwiiQEZRBPooCGHX2L34JjsD0QFxpff++ls9W2bxE+EpE7bzOYDB0E dMfVQdpALwL0ajHBbHBG2IWP8B2HkOINDbM3mKPPwDGUNjvDgh6DoshzbqyqGWEZ wbtjbjf2W5HUp4W9yK7wWOwACy78jv3OEyAcXRQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-type:content-transfer-encoding :mime-version:from:to:cc:date:message-id:subject:in-reply-to :sender:list-id; s=arctest; t=1519839458; bh=eeWHldQEQ5/w7g0wXLz mM5+vVjdbricVl/vMrE29AkU=; b=fDjow8x/GBUIwKaXLxOXfSz2DrswL4pAF4x HYu8rpv5yTZxBQptwpf0t+gGKT1Kll3b0CsZEcYdE2CezReI/1GfygBxfpS9PHPM SR99hFbt+B4EC2cvPw1uXbpZGlI6RcuAiruvL5PjW+Z49n4TwqnqaZA1O/PuaVLy 5Hbo4Pbpp1IAC5MxsSF7bILRXgUZV+GHdX2yueJfFXkfY9syFaeyFo+g1Iva0xbm WutEcEpIKWRJad7J3dSyc4qMcpVlxt3TXUnzaNga3kd5IOuvowNEMzN4SPVGh7p/ p5EkmzA/4Tm0M0yjE1KI/AVe/OpF6j+ZzXtRzy49WxI0vZVl8Ug== ARC-Authentication-Results: i=1; mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=decadent.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=decadent.org.uk header.result=pass header_is_org_domain=yes Authentication-Results: mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=decadent.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=decadent.org.uk header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934066AbeB1Rg3 (ORCPT ); Wed, 28 Feb 2018 12:36:29 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:33189 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932543AbeB1PWO (ORCPT ); Wed, 28 Feb 2018 10:22:14 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Jeremy Compostella" , "Wolfram Sang" Date: Wed, 28 Feb 2018 15:20:22 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 108/140] i2c: core-smbus: prevent stack corruption on read I2C_BLOCK_DATA In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 3.2.100-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Jeremy Compostella commit 89c6efa61f5709327ecfa24bff18e57a4e80c7fa upstream. On a I2C_SMBUS_I2C_BLOCK_DATA read request, if data->block[0] is greater than I2C_SMBUS_BLOCK_MAX + 1, the underlying I2C driver writes data out of the msgbuf1 array boundary. It is possible from a user application to run into that issue by calling the I2C_SMBUS ioctl with data.block[0] greater than I2C_SMBUS_BLOCK_MAX + 1. This patch makes the code compliant with Documentation/i2c/dev-interface by raising an error when the requested size is larger than 32 bytes. Call Trace: [] dump_stack+0x67/0x92 [] panic+0xc5/0x1eb [] ? vprintk_default+0x1f/0x30 [] ? i2cdev_ioctl_smbus+0x303/0x320 [] __stack_chk_fail+0x1b/0x20 [] i2cdev_ioctl_smbus+0x303/0x320 [] i2cdev_ioctl+0x4d/0x1e0 [] do_vfs_ioctl+0x2ba/0x490 [] ? security_file_ioctl+0x43/0x60 [] SyS_ioctl+0x79/0x90 [] entry_SYSCALL_64_fastpath+0x12/0x6a Signed-off-by: Jeremy Compostella Signed-off-by: Wolfram Sang [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings --- drivers/i2c/i2c-core.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -2009,16 +2009,17 @@ static s32 i2c_smbus_xfer_emulated(struc the underlying bus driver */ break; case I2C_SMBUS_I2C_BLOCK_DATA: + if (data->block[0] > I2C_SMBUS_BLOCK_MAX) { + dev_err(&adapter->dev, "Invalid block %s size %d\n", + read_write == I2C_SMBUS_READ ? "read" : "write", + data->block[0]); + return -EINVAL; + } + if (read_write == I2C_SMBUS_READ) { msg[1].len = data->block[0]; } else { msg[0].len = data->block[0] + 1; - if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 1) { - dev_err(&adapter->dev, - "Invalid block write size %d\n", - data->block[0]); - return -EINVAL; - } for (i = 1; i <= data->block[0]; i++) msgbuf0[i] = data->block[i]; }