From patchwork Wed Jan 13 13:57:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 12016855 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5599BC433E0 for ; Wed, 13 Jan 2021 13:58:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE4D023382 for ; Wed, 13 Jan 2021 13:58:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726735AbhAMN6K (ORCPT ); Wed, 13 Jan 2021 08:58:10 -0500 Received: from labrats.qualcomm.com ([199.106.110.90]:13072 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725771AbhAMN6K (ORCPT ); Wed, 13 Jan 2021 08:58:10 -0500 IronPort-SDR: Ux06e3l0vTkq/wwdNRM5vu2S67uamv63vD6QQuRulnBqb17HU0HoYwQIve/eezoY3zVrNFQePJ lTF9gOhmsrCmySFfn+WBTWGYF9l3/159CNYn37iXzrCD3I0l1Ehm0obWgY7ufs+5B2UEnEQpZy 66OFNIGShCaahBMgk9us5Mkj8zQDE3cj3YfvodbKmr/PauCXdUoFqlj5gIOjyf6AXty53qnFut JQCOGCT0ri2V+YmPwbhlUCaK7/Cb/Oq+ZHsPoHraPYNNZ3fMYWNHLq0UmlvkokxBIbBbpLPL5C SPE= X-IronPort-AV: E=Sophos;i="5.79,344,1602572400"; d="scan'208";a="29536981" Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by labrats.qualcomm.com with ESMTP; 13 Jan 2021 05:57:31 -0800 X-QCInternal: smtphost Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg01-sd.qualcomm.com with ESMTP; 13 Jan 2021 05:57:30 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 43B842191C; Wed, 13 Jan 2021 05:57:30 -0800 (PST) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Alim Akhtar , Avri Altman , "James E.J. Bottomley" , "Martin K. Petersen" , Matthias Brugger , Stanley Chu , Bean Huo , Adrian Hunter , Nitin Rawat , Satya Tangirala , linux-kernel@vger.kernel.org (open list), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Mediatek SoC support), linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek SoC support) Subject: [PATCH v4 2/2] scsi: ufs: Protect PM ops and err_handler from user access through sysfs Date: Wed, 13 Jan 2021 05:57:09 -0800 Message-Id: <1610546230-14732-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1610546230-14732-1-git-send-email-cang@codeaurora.org> References: <1610546230-14732-1-git-send-email-cang@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org User layer may access sysfs nodes when system PM ops or error handling is running, which can cause various problems. Rename eh_sem to host_sem and use it to protect PM ops and error handling from user layer intervene. Acked-by: Avri Altman Reviewed-by: Stanley Chu Signed-off-by: Can Guo --- drivers/scsi/ufs/ufs-sysfs.c | 106 ++++++++++++++++++++++++++++++++++++------- drivers/scsi/ufs/ufshcd.c | 42 ++++++++++------- drivers/scsi/ufs/ufshcd.h | 10 +++- 3 files changed, 125 insertions(+), 33 deletions(-) diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c index 0e14384..7cafffc 100644 --- a/drivers/scsi/ufs/ufs-sysfs.c +++ b/drivers/scsi/ufs/ufs-sysfs.c @@ -154,18 +154,29 @@ static ssize_t auto_hibern8_show(struct device *dev, struct device_attribute *attr, char *buf) { u32 ahit; + int ret; struct ufs_hba *hba = dev_get_drvdata(dev); if (!ufshcd_is_auto_hibern8_supported(hba)) return -EOPNOTSUPP; + down(&hba->host_sem); + if (!ufshcd_is_sysfs_allowed(hba)) { + ret = -EBUSY; + goto out; + } + pm_runtime_get_sync(hba->dev); ufshcd_hold(hba, false); ahit = ufshcd_readl(hba, REG_AUTO_HIBERNATE_IDLE_TIMER); ufshcd_release(hba); pm_runtime_put_sync(hba->dev); - return sysfs_emit(buf, "%d\n", ufshcd_ahit_to_us(ahit)); + ret = sysfs_emit(buf, "%d\n", ufshcd_ahit_to_us(ahit)); + +out: + up(&hba->host_sem); + return ret; } static ssize_t auto_hibern8_store(struct device *dev, @@ -174,6 +185,7 @@ static ssize_t auto_hibern8_store(struct device *dev, { struct ufs_hba *hba = dev_get_drvdata(dev); unsigned int timer; + int ret = 0; if (!ufshcd_is_auto_hibern8_supported(hba)) return -EOPNOTSUPP; @@ -184,9 +196,17 @@ static ssize_t auto_hibern8_store(struct device *dev, if (timer > UFSHCI_AHIBERN8_MAX) return -EINVAL; + down(&hba->host_sem); + if (!ufshcd_is_sysfs_allowed(hba)) { + ret = -EBUSY; + goto out; + } + ufshcd_auto_hibern8_update(hba, ufshcd_us_to_ahit(timer)); - return count; +out: + up(&hba->host_sem); + return ret ? ret : count; } static DEVICE_ATTR_RW(rpm_lvl); @@ -225,12 +245,21 @@ static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba, if (param_size > 8) return -EINVAL; + down(&hba->host_sem); + if (!ufshcd_is_sysfs_allowed(hba)) { + ret = -EBUSY; + goto out; + } + pm_runtime_get_sync(hba->dev); ret = ufshcd_read_desc_param(hba, desc_id, desc_index, param_offset, desc_buf, param_size); pm_runtime_put_sync(hba->dev); - if (ret) - return -EINVAL; + if (ret) { + ret = -EINVAL; + goto out; + } + switch (param_size) { case 1: ret = sysfs_emit(sysfs_buf, "0x%02X\n", *desc_buf); @@ -249,6 +278,8 @@ static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba, break; } +out: + up(&hba->host_sem); return ret; } @@ -591,9 +622,16 @@ static ssize_t _name##_show(struct device *dev, \ int desc_len = QUERY_DESC_MAX_SIZE; \ u8 *desc_buf; \ \ + down(&hba->host_sem); \ + if (!ufshcd_is_sysfs_allowed(hba)) { \ + up(&hba->host_sem); \ + return -EBUSY; \ + } \ desc_buf = kzalloc(QUERY_DESC_MAX_SIZE, GFP_ATOMIC); \ - if (!desc_buf) \ - return -ENOMEM; \ + if (!desc_buf) { \ + up(&hba->host_sem); \ + return -ENOMEM; \ + } \ pm_runtime_get_sync(hba->dev); \ ret = ufshcd_query_descriptor_retry(hba, \ UPIU_QUERY_OPCODE_READ_DESC, QUERY_DESC_IDN_DEVICE, \ @@ -609,10 +647,11 @@ static ssize_t _name##_show(struct device *dev, \ SD_ASCII_STD); \ if (ret < 0) \ goto out; \ - ret = sysfs_emit(buf, "%s\n", desc_buf); \ + ret = sysfs_emit(buf, "%s\n", desc_buf); \ out: \ pm_runtime_put_sync(hba->dev); \ kfree(desc_buf); \ + up(&hba->host_sem); \ return ret; \ } \ static DEVICE_ATTR_RO(_name) @@ -651,15 +690,26 @@ static ssize_t _name##_show(struct device *dev, \ u8 index = 0; \ int ret; \ struct ufs_hba *hba = dev_get_drvdata(dev); \ + \ + down(&hba->host_sem); \ + if (!ufshcd_is_sysfs_allowed(hba)) { \ + up(&hba->host_sem); \ + return -EBUSY; \ + } \ if (ufshcd_is_wb_flags(QUERY_FLAG_IDN##_uname)) \ index = ufshcd_wb_get_query_index(hba); \ pm_runtime_get_sync(hba->dev); \ ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG, \ QUERY_FLAG_IDN##_uname, index, &flag); \ pm_runtime_put_sync(hba->dev); \ - if (ret) \ - return -EINVAL; \ - return sysfs_emit(buf, "%s\n", flag ? "true" : "false"); \ + if (ret) { \ + ret = -EINVAL; \ + goto out; \ + } \ + ret = sysfs_emit(buf, "%s\n", flag ? "true" : "false"); \ +out: \ + up(&hba->host_sem); \ + return ret; \ } \ static DEVICE_ATTR_RO(_name) @@ -709,15 +759,26 @@ static ssize_t _name##_show(struct device *dev, \ u32 value; \ int ret; \ u8 index = 0; \ + \ + down(&hba->host_sem); \ + if (!ufshcd_is_sysfs_allowed(hba)) { \ + up(&hba->host_sem); \ + return -EBUSY; \ + } \ if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN##_uname)) \ index = ufshcd_wb_get_query_index(hba); \ pm_runtime_get_sync(hba->dev); \ ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, \ QUERY_ATTR_IDN##_uname, index, 0, &value); \ pm_runtime_put_sync(hba->dev); \ - if (ret) \ - return -EINVAL; \ - return sysfs_emit(buf, "0x%08X\n", value); \ + if (ret) { \ + ret = -EINVAL; \ + goto out; \ + } \ + ret = sysfs_emit(buf, "0x%08X\n", value); \ +out: \ + up(&hba->host_sem); \ + return ret; \ } \ static DEVICE_ATTR_RO(_name) @@ -850,13 +911,26 @@ static ssize_t dyn_cap_needed_attribute_show(struct device *dev, u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun); int ret; + down(&hba->host_sem); + if (!ufshcd_is_sysfs_allowed(hba)) { + ret = -EBUSY; + goto out; + } + pm_runtime_get_sync(hba->dev); ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, QUERY_ATTR_IDN_DYN_CAP_NEEDED, lun, 0, &value); pm_runtime_put_sync(hba->dev); - if (ret) - return -EINVAL; - return sysfs_emit(buf, "0x%08X\n", value); + if (ret) { + ret = -EINVAL; + goto out; + } + + ret = sysfs_emit(buf, "0x%08X\n", value); + +out: + up(&hba->host_sem); + return ret; } static DEVICE_ATTR_RO(dyn_cap_needed_attribute); diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 969aed9..d2bdf0c 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1551,11 +1551,17 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev, { struct ufs_hba *hba = dev_get_drvdata(dev); u32 value; - int err; + int err = 0; if (kstrtou32(buf, 0, &value)) return -EINVAL; + down(&hba->host_sem); + if (!ufshcd_is_sysfs_allowed(hba)) { + err = -EBUSY; + goto out; + } + value = !!value; if (value == hba->clk_scaling.is_allowed) goto out; @@ -1581,7 +1587,8 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev, ufshcd_release(hba); pm_runtime_put_sync(hba->dev); out: - return count; + up(&hba->host_sem); + return err ? err : count; } static void ufshcd_clkscaling_init_sysfs(struct ufs_hba *hba) @@ -5779,9 +5786,10 @@ static void ufshcd_err_handling_unprepare(struct ufs_hba *hba) static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba) { - return (!hba->is_powered || hba->ufshcd_state == UFSHCD_STATE_ERROR || + return (!hba->is_powered || hba->shutting_down || + hba->ufshcd_state == UFSHCD_STATE_ERROR || (!(hba->saved_err || hba->saved_uic_err || hba->force_reset || - ufshcd_is_link_broken(hba)))); + ufshcd_is_link_broken(hba)))); } #ifdef CONFIG_PM @@ -5851,13 +5859,13 @@ static void ufshcd_err_handler(struct work_struct *work) hba = container_of(work, struct ufs_hba, eh_work); - down(&hba->eh_sem); + down(&hba->host_sem); spin_lock_irqsave(hba->host->host_lock, flags); if (ufshcd_err_handling_should_stop(hba)) { if (hba->ufshcd_state != UFSHCD_STATE_ERROR) hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; spin_unlock_irqrestore(hba->host->host_lock, flags); - up(&hba->eh_sem); + up(&hba->host_sem); return; } ufshcd_set_eh_in_progress(hba); @@ -6026,7 +6034,7 @@ static void ufshcd_err_handler(struct work_struct *work) spin_unlock_irqrestore(hba->host->host_lock, flags); ufshcd_scsi_unblock_requests(hba); ufshcd_err_handling_unprepare(hba); - up(&hba->eh_sem); + up(&hba->host_sem); } /** @@ -7928,10 +7936,10 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie) struct ufs_hba *hba = (struct ufs_hba *)data; int ret; - down(&hba->eh_sem); + down(&hba->host_sem); /* Initialize hba, detect and initialize UFS device */ ret = ufshcd_probe_hba(hba, true); - up(&hba->eh_sem); + up(&hba->host_sem); if (ret) goto out; @@ -8960,7 +8968,7 @@ int ufshcd_system_suspend(struct ufs_hba *hba) return 0; } - down(&hba->eh_sem); + down(&hba->host_sem); if (!hba->is_powered) return 0; @@ -8993,7 +9001,7 @@ int ufshcd_system_suspend(struct ufs_hba *hba) if (!ret) hba->is_sys_suspended = true; else - up(&hba->eh_sem); + up(&hba->host_sem); return ret; } EXPORT_SYMBOL(ufshcd_system_suspend); @@ -9015,7 +9023,7 @@ int ufshcd_system_resume(struct ufs_hba *hba) if (unlikely(early_suspend)) { early_suspend = false; - down(&hba->eh_sem); + down(&hba->host_sem); } if (!hba->is_powered || pm_runtime_suspended(hba->dev)) @@ -9032,7 +9040,7 @@ int ufshcd_system_resume(struct ufs_hba *hba) hba->curr_dev_pwr_mode, hba->uic_link_state); if (!ret) hba->is_sys_suspended = false; - up(&hba->eh_sem); + up(&hba->host_sem); return ret; } EXPORT_SYMBOL(ufshcd_system_resume); @@ -9124,7 +9132,10 @@ int ufshcd_shutdown(struct ufs_hba *hba) { int ret = 0; - down(&hba->eh_sem); + down(&hba->host_sem); + hba->shutting_down = true; + up(&hba->host_sem); + if (!hba->is_powered) goto out; @@ -9138,7 +9149,6 @@ int ufshcd_shutdown(struct ufs_hba *hba) if (ret) dev_err(hba->dev, "%s failed, err %d\n", __func__, ret); hba->is_powered = false; - up(&hba->eh_sem); /* allow force shutdown even in case of errors */ return 0; } @@ -9334,7 +9344,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) INIT_WORK(&hba->eh_work, ufshcd_err_handler); INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler); - sema_init(&hba->eh_sem, 1); + sema_init(&hba->host_sem, 1); /* Initialize UIC command mutex */ mutex_init(&hba->uic_cmd_mutex); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 85f9d0f..9dfd9c3 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -663,6 +663,8 @@ struct ufs_hba_variant_params { * @intr_mask: Interrupt Mask Bits * @ee_ctrl_mask: Exception event control mask * @is_powered: flag to check if HBA is powered + * @shutting_down: flag to check if shutdown has been invoked + * @host_sem: semaphore used to serialize concurrent contexts * @eh_wq: Workqueue that eh_work works on * @eh_work: Worker to handle UFS errors that require s/w attention * @eeh_work: Worker to handle exception events @@ -759,7 +761,8 @@ struct ufs_hba { u32 intr_mask; u16 ee_ctrl_mask; bool is_powered; - struct semaphore eh_sem; + bool shutting_down; + struct semaphore host_sem; /* Work Queues */ struct workqueue_struct *eh_wq; @@ -883,6 +886,11 @@ static inline bool ufshcd_is_wb_allowed(struct ufs_hba *hba) return hba->caps & UFSHCD_CAP_WB_EN; } +static inline bool ufshcd_is_sysfs_allowed(struct ufs_hba *hba) +{ + return !hba->shutting_down; +} + #define ufshcd_writel(hba, val, reg) \ writel((val), (hba)->mmio_base + (reg)) #define ufshcd_readl(hba, reg) \