From: Andrey Pronin <apronin@chromium.org> To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Cc: Peter Huewe <peterhuewe@gmx.de>, Marcel Selhorst <tpmdd@selhorst.net>, Jason Gunthorpe <jgunthorpe@obsidianresearch.com>, tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Christophe Ricard <christophe.ricard@gmail.com>, dtor@chromium.org, smbarber@chromium.org, dianders@chromium.org, Andrey Pronin <apronin@chromium.org> Subject: [PATCH v3 1/2] tpm_tis_core: add optional max xfer size check Date: Wed, 27 Jul 2016 20:49:56 -0700 [thread overview] Message-ID: <1469677797-74304-2-git-send-email-apronin@chromium.org> (raw) In-Reply-To: <1469677797-74304-1-git-send-email-apronin@chromium.org> In-Reply-To: <1468546745-14646-1-git-send-email-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> --- 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 f22caf8..7c4fa0c 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -168,8 +168,15 @@ 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; + } msleep(TPM_TIMEOUT); } 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 9191aab..58e8b14 100644 --- a/drivers/char/tpm/tpm_tis_core.h +++ b/drivers/char/tpm/tpm_tis_core.h @@ -102,6 +102,7 @@ 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, -- 2.6.6
WARNING: multiple messages have this Message-ID (diff)
From: Andrey Pronin <apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> To: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> Cc: Christophe Ricard <christophe.ricard-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, smbarber-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org, tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, dtor-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org Subject: [PATCH v3 1/2] tpm_tis_core: add optional max xfer size check Date: Wed, 27 Jul 2016 20:49:56 -0700 [thread overview] Message-ID: <1469677797-74304-2-git-send-email-apronin@chromium.org> (raw) In-Reply-To: <1469677797-74304-1-git-send-email-apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> In-Reply-To: <1468546745-14646-1-git-send-email-apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.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-F7+t8E8rja9g9hUCZPvPmw@public.gmane.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 f22caf8..7c4fa0c 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -168,8 +168,15 @@ 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; + } msleep(TPM_TIMEOUT); } 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 9191aab..58e8b14 100644 --- a/drivers/char/tpm/tpm_tis_core.h +++ b/drivers/char/tpm/tpm_tis_core.h @@ -102,6 +102,7 @@ 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, -- 2.6.6 ------------------------------------------------------------------------------
next prev parent reply other threads:[~2016-07-28 3:50 UTC|newest] Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-15 1:39 [PATCH 0/2] tpm: add optional max xfer size check Andrey Pronin 2016-07-15 1:39 ` [PATCH 1/2] tpm_tis_core: " Andrey Pronin 2016-07-15 3:13 ` Jason Gunthorpe 2016-07-15 3:13 ` Jason Gunthorpe 2016-07-15 3:25 ` Andrey Pronin 2016-07-15 3:48 ` Guenter Roeck 2016-07-18 18:53 ` Jarkko Sakkinen 2016-07-18 18:53 ` Jarkko Sakkinen 2016-07-15 1:39 ` [PATCH 2/2] tpm_tis_spi: add max xfer size Andrey Pronin 2016-07-15 1:39 ` Andrey Pronin 2016-07-20 2:34 ` [PATCH v2 0/2] tpm: add optional max xfer size check Andrey Pronin 2016-07-20 2:34 ` Andrey Pronin 2016-07-20 2:34 ` [PATCH v2 1/2] tpm_tis_core: " Andrey Pronin 2016-07-20 2:34 ` Andrey Pronin 2016-07-20 2:34 ` [PATCH v2 2/2] tpm_tis_spi: add max xfer size Andrey Pronin 2016-07-20 15:10 ` [PATCH v2 0/2] tpm: add optional max xfer size check Jarkko Sakkinen 2016-07-20 15:10 ` Jarkko Sakkinen 2016-07-28 3:49 ` [PATCH v3 " Andrey Pronin 2016-07-28 3:49 ` Andrey Pronin 2016-07-28 3:49 ` Andrey Pronin [this message] 2016-07-28 3:49 ` [PATCH v3 1/2] tpm_tis_core: " Andrey Pronin 2016-07-28 22:52 ` Dmitry Torokhov 2016-08-09 8:14 ` Jarkko Sakkinen 2016-08-09 8:14 ` Jarkko Sakkinen 2020-11-19 10:00 ` Dafna Hirschfeld 2020-11-20 15:15 ` Jarkko Sakkinen 2016-07-28 3:49 ` [PATCH v3 2/2] tpm_tis_spi: add max xfer size Andrey Pronin 2016-07-28 3:49 ` Andrey Pronin 2016-07-28 22:53 ` Dmitry Torokhov 2016-08-09 8:14 ` Jarkko Sakkinen 2016-08-09 8:14 ` Jarkko Sakkinen
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