From: Stephen Boyd <swboyd@chromium.org>
To: Peter Huewe <peterhuewe@gmx.de>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Andrey Pronin <apronin@chromium.org>,
linux-kernel@vger.kernel.org, Jason Gunthorpe <jgg@ziepe.ca>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-integrity@vger.kernel.org,
Duncan Laurie <dlaurie@chromium.org>,
Guenter Roeck <groeck@chromium.org>,
Dmitry Torokhov <dtor@chromium.org>
Subject: [PATCH v2 2/6] tpm_tis_core: add optional max xfer size check
Date: Tue, 16 Jul 2019 15:45:14 -0700 [thread overview]
Message-ID: <20190716224518.62556-3-swboyd@chromium.org> (raw)
In-Reply-To: <20190716224518.62556-1-swboyd@chromium.org>
From: Andrey Pronin <apronin@chromium.org>
If tpm reports a bigger burstcnt than allowed by the physical protocol,
set burstcnt to the max allowed value.
In practice, seen in case of xfer issues (e.g. in spi interface case,
lost header causing flow control issues and wrong values returned on read
from TPM_STS). Without catching, causes the physical layer to reject xfer.
Signed-off-by: Andrey Pronin <apronin@chromium.org>
Reviewed-by: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
[swboyd@chromium.org: Drop extra parenthesis in if statement]
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
drivers/char/tpm/tpm_tis_core.c | 9 ++++++++-
drivers/char/tpm/tpm_tis_core.h | 1 +
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index c3181ea9f271..5134b05487e5 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -268,8 +268,15 @@ static int get_burstcount(struct tpm_chip *chip)
return rc;
burstcnt = (value >> 8) & 0xFFFF;
- if (burstcnt)
+ if (burstcnt) {
+ if (priv->phy_ops->max_xfer_size &&
+ burstcnt > priv->phy_ops->max_xfer_size) {
+ dev_warn(&chip->dev,
+ "Bad burstcnt read: %d\n", burstcnt);
+ burstcnt = priv->phy_ops->max_xfer_size;
+ }
return burstcnt;
+ }
usleep_range(TPM_TIMEOUT_USECS_MIN, TPM_TIMEOUT_USECS_MAX);
} while (time_before(jiffies, stop));
return -EBUSY;
diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h
index 7337819f5d7b..248e8ac8fd02 100644
--- a/drivers/char/tpm/tpm_tis_core.h
+++ b/drivers/char/tpm/tpm_tis_core.h
@@ -106,6 +106,7 @@ struct tpm_tis_phy_ops {
int (*read16)(struct tpm_tis_data *data, u32 addr, u16 *result);
int (*read32)(struct tpm_tis_data *data, u32 addr, u32 *result);
int (*write32)(struct tpm_tis_data *data, u32 addr, u32 src);
+ u16 max_xfer_size;
};
static inline int tpm_tis_read_bytes(struct tpm_tis_data *data, u32 addr,
--
Sent by a computer through tubes
next prev parent reply other threads:[~2019-07-16 22:45 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-16 22:45 [PATCH v2 0/6] tpm: Add driver for cr50 Stephen Boyd
2019-07-16 22:45 ` [PATCH v2 1/6] hwrng: core: Freeze khwrng thread during suspend Stephen Boyd
2019-07-17 1:43 ` Herbert Xu
2019-07-17 16:36 ` Stephen Boyd
2019-07-17 11:39 ` Jason Gunthorpe
2019-07-17 16:42 ` Stephen Boyd
2019-07-17 16:50 ` Jason Gunthorpe
2019-07-17 17:03 ` Stephen Boyd
2019-08-02 22:50 ` Stephen Boyd
2019-08-16 15:56 ` Alexander Steffen
2019-08-16 23:55 ` Jarkko Sakkinen
2019-08-02 20:22 ` Jarkko Sakkinen
2019-08-02 23:18 ` Stephen Boyd
2019-07-16 22:45 ` Stephen Boyd [this message]
2019-07-16 22:45 ` [PATCH v2 3/6] tpm_tis_spi: add max xfer size Stephen Boyd
2019-07-17 8:07 ` Alexander Steffen
2019-07-17 18:19 ` Stephen Boyd
2019-07-16 22:45 ` [PATCH v2 4/6] dt-bindings: tpm: document properties for cr50 Stephen Boyd
2019-07-16 22:45 ` [PATCH v2 5/6] tpm: add driver for cr50 on SPI Stephen Boyd
2019-07-17 12:00 ` Alexander Steffen
2019-07-17 12:25 ` Jason Gunthorpe
2019-07-17 16:49 ` Stephen Boyd
2019-07-17 16:56 ` Jason Gunthorpe
2019-07-17 17:05 ` Stephen Boyd
2019-07-17 17:12 ` Jason Gunthorpe
2019-07-17 17:22 ` Stephen Boyd
2019-07-17 17:25 ` Jason Gunthorpe
2019-07-17 18:21 ` Stephen Boyd
2019-07-17 18:30 ` Guenter Roeck
2019-07-17 18:36 ` Jason Gunthorpe
2019-07-17 19:57 ` Stephen Boyd
2019-07-17 21:38 ` Stephen Boyd
2019-07-17 22:17 ` Stephen Boyd
2019-07-18 16:47 ` Alexander Steffen
2019-07-18 18:11 ` Stephen Boyd
2019-07-19 7:53 ` Alexander Steffen
2019-08-01 16:02 ` Stephen Boyd
2019-08-02 15:21 ` Jarkko Sakkinen
2019-08-02 18:03 ` Stephen Boyd
2019-08-02 19:43 ` Jarkko Sakkinen
2019-07-18 16:47 ` Alexander Steffen
2019-07-18 18:07 ` Stephen Boyd
2019-07-19 7:51 ` Alexander Steffen
2019-08-02 20:43 ` Jarkko Sakkinen
2019-08-02 22:32 ` Stephen Boyd
2019-08-02 20:41 ` Jarkko Sakkinen
2019-07-16 22:45 ` [PATCH v2 6/6] tpm: Add driver for cr50 on I2C Stephen Boyd
2019-07-17 15:19 ` Alexander Steffen
2019-08-05 23:52 ` Stephen Boyd
2019-08-02 20:44 ` Jarkko Sakkinen
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