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 267F5C27C4F for ; Fri, 31 May 2024 07:43:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=pOojgW7jODlXLC07ppmL3yWlxwR3a4EferTz1dswu+8=; b=qkwzdwQPDaEmzK Q8nd3O1N1uL/+eZ6d5fLCcfUEaEgADhRWFeF+YngBPzxUTNfHD6DgBjj10lqde7Ju1OhrEK7OD3ln scOjcoTg4fGDXw/6zS/su3ezza3utkXKawJnbPMfoCdaGkTiAGdr4S/lggjzKSVdi4UztDi2EGsiD HoMoe5ITYsQPUjb2qEXKfRlBhWPP9onDMsCeoC/FVGABriqhM9uYhBRosTduNCx0tZ7lJ0ywOHVU9 ZaOGCRouRujq9R82LnG3ZmatXI3fBtgk6Fn6fmAcQAp6IAJCjtM6FndE4pw89sCfyKTF0L/OiiGwz zwRlSAwwYtgVIv0Y5Jkw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sCwv3-00000009WtO-2dxZ; Fri, 31 May 2024 07:43:21 +0000 Received: from smtp-fw-52004.amazon.com ([52.119.213.154]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sCwux-00000009Wt2-3IVN for linux-arm-kernel@lists.infradead.org; Fri, 31 May 2024 07:43:20 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1717141396; x=1748677396; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=/9TcEfcmlhOhbQiEqMm/468xXgoXewDL5g4J3m8ERMc=; b=ojnRwQI59Vk39cR0JtkTVLYqYQTFZEWUOGbu+3DvGeKf91ZZ5AMdVEr9 7lEKm+4hYC4mQ8x+z7dXQzC3tbRCgL+rYvgrqDumBG9WQE5TA5tcy4gA8 +CgtUiKQxQCY8EWJGIqz0MjAOLgj/rL6XyOQ81mJB1a3p3h26/PGg94qN g=; X-IronPort-AV: E=Sophos;i="6.08,203,1712620800"; d="scan'208";a="208722784" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.43.8.2]) by smtp-border-fw-52004.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2024 07:43:10 +0000 Received: from EX19MTAEUB002.ant.amazon.com [10.0.43.254:52673] by smtpin.naws.eu-west-1.prod.farcaster.email.amazon.dev [10.0.27.131:2525] with esmtp (Farcaster) id dc36c378-df5c-4d05-b391-0f404366b043; Fri, 31 May 2024 07:43:08 +0000 (UTC) X-Farcaster-Flow-ID: dc36c378-df5c-4d05-b391-0f404366b043 Received: from EX19D008EUA004.ant.amazon.com (10.252.50.158) by EX19MTAEUB002.ant.amazon.com (10.252.51.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.28; Fri, 31 May 2024 07:43:07 +0000 Received: from EX19MTAUEC001.ant.amazon.com (10.252.135.222) by EX19D008EUA004.ant.amazon.com (10.252.50.158) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.28; Fri, 31 May 2024 07:43:07 +0000 Received: from dev-dsk-hagarhem-1b-b868d8d5.eu-west-1.amazon.com (10.253.65.58) by mail-relay.amazon.com (10.252.135.200) with Microsoft SMTP Server id 15.2.1258.28 via Frontend Transport; Fri, 31 May 2024 07:43:07 +0000 Received: by dev-dsk-hagarhem-1b-b868d8d5.eu-west-1.amazon.com (Postfix, from userid 23002382) id 0A2E120BED; Fri, 31 May 2024 07:43:07 +0000 (UTC) From: Hagar Hemdan To: CC: Maximilian Heyne , Norbert Manthey , Hagar Hemdan , Marc Zyngier , "Thomas Gleixner" , Eric Auger , , Subject: [PATCH v2] irqchip/gic-v3-its: Fix potential race condition in its_vlpi_prop_update() Date: Fri, 31 May 2024 07:43:02 +0000 Message-ID: <20240531074302.30563-1-hagarhem@amazon.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240531_004319_181117_7DC96167 X-CRM114-Status: GOOD ( 17.03 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org its_vlpi_prop_update() calls lpi_write_config() which obtains the mapping information for a VLPI without lock held. So it could race with its_vlpi_unmap(). Since all calls from its_irq_set_vcpu_affinity() require the same lock to be held. So instead of peppering the locking all over the place, we hoist the locking into its_irq_set_vcpu_affinity(). This bug was discovered and resolved using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc. Fixes: 015ec0386ab6 ("irqchip/gic-v3-its: Add VLPI configuration handling") Signed-off-by: Hagar Hemdan --- v2: moved the lock to its_irq_set_vcpu_affinity(). Only compile-tested, no access to HW. --- drivers/irqchip/irq-gic-v3-its.c | 65 +++++++++++++------------------- 1 file changed, 27 insertions(+), 38 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 40ebf1726393..f9e824ad1523 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1846,28 +1846,22 @@ static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); u32 event = its_get_event_id(d); - int ret = 0; if (!info->map) return -EINVAL; - raw_spin_lock(&its_dev->event_map.vlpi_lock); - if (!its_dev->event_map.vm) { struct its_vlpi_map *maps; maps = kcalloc(its_dev->event_map.nr_lpis, sizeof(*maps), GFP_ATOMIC); - if (!maps) { - ret = -ENOMEM; - goto out; - } + if (!maps) + return -ENOMEM; its_dev->event_map.vm = info->map->vm; its_dev->event_map.vlpi_maps = maps; } else if (its_dev->event_map.vm != info->map->vm) { - ret = -EINVAL; - goto out; + return -EINVAL; } /* Get our private copy of the mapping information */ @@ -1899,46 +1893,32 @@ static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info) its_dev->event_map.nr_vlpis++; } -out: - raw_spin_unlock(&its_dev->event_map.vlpi_lock); - return ret; + return 0; } static int its_vlpi_get(struct irq_data *d, struct its_cmd_info *info) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); struct its_vlpi_map *map; - int ret = 0; - - raw_spin_lock(&its_dev->event_map.vlpi_lock); map = get_vlpi_map(d); - if (!its_dev->event_map.vm || !map) { - ret = -EINVAL; - goto out; - } + if (!its_dev->event_map.vm || !map) + return -EINVAL; /* Copy our mapping information to the incoming request */ *info->map = *map; -out: - raw_spin_unlock(&its_dev->event_map.vlpi_lock); - return ret; + return 0; } static int its_vlpi_unmap(struct irq_data *d) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); u32 event = its_get_event_id(d); - int ret = 0; - raw_spin_lock(&its_dev->event_map.vlpi_lock); - - if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d)) { - ret = -EINVAL; - goto out; - } + if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d)) + return -EINVAL; /* Drop the virtual mapping */ its_send_discard(its_dev, event); @@ -1962,9 +1942,7 @@ static int its_vlpi_unmap(struct irq_data *d) kfree(its_dev->event_map.vlpi_maps); } -out: - raw_spin_unlock(&its_dev->event_map.vlpi_lock); - return ret; + return 0; } static int its_vlpi_prop_update(struct irq_data *d, struct its_cmd_info *info) @@ -1987,29 +1965,40 @@ static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); struct its_cmd_info *info = vcpu_info; + int ret; /* Need a v4 ITS */ if (!is_v4(its_dev->its)) return -EINVAL; + raw_spin_lock(&its_dev->event_map.vlpi_lock); + /* Unmap request? */ - if (!info) - return its_vlpi_unmap(d); + if (!info) { + ret = its_vlpi_unmap(d); + goto out; + } switch (info->cmd_type) { case MAP_VLPI: - return its_vlpi_map(d, info); + ret = its_vlpi_map(d, info); + break; case GET_VLPI: - return its_vlpi_get(d, info); + ret = its_vlpi_get(d, info); + break; case PROP_UPDATE_VLPI: case PROP_UPDATE_AND_INV_VLPI: - return its_vlpi_prop_update(d, info); + ret = its_vlpi_prop_update(d, info); + break; default: - return -EINVAL; + ret = -EINVAL; } +out: + raw_spin_unlock(&its_dev->event_map.vlpi_lock); + return ret; } static struct irq_chip its_irq_chip = { -- 2.40.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel