linux-kernel - Re: boot failure with 4.13.0-rc6 due to ATA errors

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Message-ID: <20170829124206.GA26738@lst.de>
Date:   Tue, 29 Aug 2017 14:42:06 +0200
From:   Christoph Hellwig <hch@....de>
To:     Tejun Heo <tj@...nel.org>
Cc:     David Ahern <dsahern@...il.com>, linux-ide@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Robert Elliott <elliott@....com>
Subject: Re: boot failure with 4.13.0-rc6 due to ATA errors

On Mon, Aug 28, 2017 at 02:22:25PM -0700, Tejun Heo wrote:
> Hello,
> 
> On Mon, Aug 28, 2017 at 02:26:52PM -0600, David Ahern wrote:
> > On 8/28/17 1:59 PM, Tejun Heo wrote:
> > > Can you please verify whether 818831c8b22f ("libata: implement
> > > SECURITY PROTOCOL IN/OUT") is the culprit?  ie. try to boot the commit
> > > to verify that the problem is there, and try the one prior?
> > 
> > That commit is the problem. a0fd2454a36ffab2ce39b3a91c1385a5f98e63f0
> > works fine.
> 
> Christoph, is there anything we can do to further gate issuing of the
> offending command?  Otherwise, we might have to go for whitelist
> instead.

We could try to check the IDENTIFY DEVICE word, but given that it has
a dual meaning in older spec versions I don't really like the idea
either.  Untested patch below as I'm not near my OPAL capable drive.

Also most recent ATA features seem to be keyed off a log page of some
sort, so we'll run into more problems like this.

---
>From e661047ec3a25587648b07c02a687a7dac778f3b Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@....de>
Date: Tue, 29 Aug 2017 14:35:50 +0200
Subject: libata: check for trusted computing in IDENTIFY DEVICE data

ATA-8 and later mirrors the TRUSTED COMPUTING SUPPORTED bit in word 48 of
the IDENTIFY DEVICE data.  Check this before issuing a READ LOG PAGE
command to avoid issues with buggy devices.  The only downside is that
we can't support Security Send / Receive for a device with an older
revision due to the conflicting use of this field in earlier
specifications.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/ata/libata-core.c |  3 +++
 include/linux/ata.h       | 10 +++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 697f5f896b19..ca57b03ab950 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2413,6 +2413,9 @@ static void ata_dev_config_trusted(struct ata_device *dev)
 	u64 trusted_cap;
 	unsigned int err;
 
+	if (!ata_id_has_trusted(dev->id))
+		return;
+
 	if (!ata_identify_page_supported(dev, ATA_LOG_SECURITY)) {
 		ata_dev_warn(dev,
 			     "Security Log not supported\n");
diff --git a/include/linux/ata.h b/include/linux/ata.h
index e65ae4b2ed48..c7a353825450 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -60,7 +60,8 @@ enum {
 	ATA_ID_FW_REV		= 23,
 	ATA_ID_PROD		= 27,
 	ATA_ID_MAX_MULTSECT	= 47,
-	ATA_ID_DWORD_IO		= 48,
+	ATA_ID_DWORD_IO		= 48,	/* before ATA-8 */
+	ATA_ID_TRUSTED		= 48,	/* ATA-8 and later */
 	ATA_ID_CAPABILITY	= 49,
 	ATA_ID_OLD_PIO_MODES	= 51,
 	ATA_ID_OLD_DMA_MODES	= 52,
@@ -889,6 +890,13 @@ static inline bool ata_id_has_dword_io(const u16 *id)
 	return id[ATA_ID_DWORD_IO] & (1 << 0);
 }
 
+static inline bool ata_id_has_trusted(const u16 *id)
+{
+	if (ata_id_major_version(id) <= 7)
+		return false;
+	return id[ATA_ID_TRUSTED] & (1 << 0);
+}
+
 static inline bool ata_id_has_unload(const u16 *id)
 {
 	if (ata_id_major_version(id) >= 7 &&
-- 
2.11.0