From: Keith Busch <keith.busch@intel.com> To: Christoph Hellwig <hch@lst.de> Cc: scott.bauer@intel.com, jonathan.derrick@intel.com, axboe@fb.com, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org Subject: Re: [PATCH 4/4] nvme: re-check security protocol support after reset Date: Fri, 17 Feb 2017 10:26:51 -0500 [thread overview] Message-ID: <20170217152651.GA18275@localhost.localdomain> (raw) In-Reply-To: <20170217125941.14319-5-hch@lst.de> On Fri, Feb 17, 2017 at 01:59:41PM +0100, Christoph Hellwig wrote: > @@ -1789,7 +1789,8 @@ static void nvme_reset_work(struct work_struct *work) > if (result) > goto out; > > - if ((dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) && !dev->ctrl.opal_dev) { > + kfree(dev->ctrl.opal_dev); > + if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) { > dev->ctrl.opal_dev = > init_opal_dev(&dev->ctrl, &nvme_sec_submit); > } A couple things. This has a use-after-free in opal_unlock_from_suspend if the nvme device had an opal_dev before, but no longer support the capability after resume. So you'd want to set ctrl.opal_dev to NULL after the free. But we don't want to unconditionally free it anyway during resume since opal_unlock_from_suspend requires the exisiting opal_dev state information saved in the 'unlk_list'. Something like this instead: --- diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index ddc51ad..8fa6be9 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1789,13 +1789,17 @@ static void nvme_reset_work(struct work_struct *work) if (result) goto out; - if ((dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) && !dev->ctrl.opal_dev) { - dev->ctrl.opal_dev = - init_opal_dev(&dev->ctrl, &nvme_sec_submit); + if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) + if (was_suspend && dev->ctrl.opal_dev) + opal_unlock_from_suspend(dev->ctrl.opal_dev); + else if (!dev->ctrl.opal_dev) + dev->ctrl.opal_dev = + init_opal_dev(&dev->ctrl, &nvme_sec_submit); + } else { + kfree(dev->ctrl.opal_dev); + dev->ctrl.opal_dev = NULL; } - if (was_suspend) - opal_unlock_from_suspend(dev->ctrl.opal_dev); result = nvme_setup_io_queues(dev); if (result) --
WARNING: multiple messages have this Message-ID (diff)
From: keith.busch@intel.com (Keith Busch) Subject: [PATCH 4/4] nvme: re-check security protocol support after reset Date: Fri, 17 Feb 2017 10:26:51 -0500 [thread overview] Message-ID: <20170217152651.GA18275@localhost.localdomain> (raw) In-Reply-To: <20170217125941.14319-5-hch@lst.de> On Fri, Feb 17, 2017@01:59:41PM +0100, Christoph Hellwig wrote: > @@ -1789,7 +1789,8 @@ static void nvme_reset_work(struct work_struct *work) > if (result) > goto out; > > - if ((dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) && !dev->ctrl.opal_dev) { > + kfree(dev->ctrl.opal_dev); > + if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) { > dev->ctrl.opal_dev = > init_opal_dev(&dev->ctrl, &nvme_sec_submit); > } A couple things. This has a use-after-free in opal_unlock_from_suspend if the nvme device had an opal_dev before, but no longer support the capability after resume. So you'd want to set ctrl.opal_dev to NULL after the free. But we don't want to unconditionally free it anyway during resume since opal_unlock_from_suspend requires the exisiting opal_dev state information saved in the 'unlk_list'. Something like this instead: --- diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index ddc51ad..8fa6be9 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1789,13 +1789,17 @@ static void nvme_reset_work(struct work_struct *work) if (result) goto out; - if ((dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) && !dev->ctrl.opal_dev) { - dev->ctrl.opal_dev = - init_opal_dev(&dev->ctrl, &nvme_sec_submit); + if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) + if (was_suspend && dev->ctrl.opal_dev) + opal_unlock_from_suspend(dev->ctrl.opal_dev); + else if (!dev->ctrl.opal_dev) + dev->ctrl.opal_dev = + init_opal_dev(&dev->ctrl, &nvme_sec_submit); + } else { + kfree(dev->ctrl.opal_dev); + dev->ctrl.opal_dev = NULL; } - if (was_suspend) - opal_unlock_from_suspend(dev->ctrl.opal_dev); result = nvme_setup_io_queues(dev); if (result) --
next prev parent reply other threads:[~2017-02-17 15:18 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-02-17 12:59 OPAL fixups Christoph Hellwig 2017-02-17 12:59 ` Christoph Hellwig 2017-02-17 12:59 ` [PATCH 1/4] block/sed-opal: tone down not supported warnings Christoph Hellwig 2017-02-17 12:59 ` Christoph Hellwig 2017-02-17 12:59 ` [PATCH 2/4] block/sed-opal: allocate struct opal_dev dynamically Christoph Hellwig 2017-02-17 12:59 ` Christoph Hellwig 2017-02-17 12:59 ` [PATCH 3/4] nvme: Check for Security send/recv support before issuing commands Christoph Hellwig 2017-02-17 12:59 ` Christoph Hellwig 2017-02-17 12:59 ` [PATCH 4/4] nvme: re-check security protocol support after reset Christoph Hellwig 2017-02-17 12:59 ` Christoph Hellwig 2017-02-17 15:26 ` Keith Busch [this message] 2017-02-17 15:26 ` Keith Busch 2017-02-17 15:41 ` Scott Bauer 2017-02-17 15:41 ` Scott Bauer 2017-02-17 17:01 ` Christoph Hellwig 2017-02-17 17:01 ` Christoph Hellwig 2017-02-17 16:55 ` Scott Bauer 2017-02-17 16:55 ` Scott Bauer 2017-02-17 17:16 ` Christoph Hellwig 2017-02-17 17:16 ` Christoph Hellwig 2017-02-17 15:27 ` OPAL fixups Keith Busch 2017-02-17 15:27 ` Keith Busch 2017-02-17 19:42 ` Jens Axboe 2017-02-17 19:42 ` Jens Axboe
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20170217152651.GA18275@localhost.localdomain \ --to=keith.busch@intel.com \ --cc=axboe@fb.com \ --cc=hch@lst.de \ --cc=jonathan.derrick@intel.com \ --cc=linux-block@vger.kernel.org \ --cc=linux-nvme@lists.infradead.org \ --cc=scott.bauer@intel.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.