* [PATCH 1/2] tpm_tis: Use tpm_chip_{start,stop} decoration inside tpm_tis_resume
[not found] <20230426172928.3963287-1-jarkko@kernel.org>
@ 2023-04-26 17:29 ` Jarkko Sakkinen
2023-04-27 15:11 ` Jerry Snitselaar
2023-04-26 17:29 ` [PATCH 2/2] tpm: Prevent hwrng from activating during resume Jarkko Sakkinen
1 sibling, 1 reply; 5+ messages in thread
From: Jarkko Sakkinen @ 2023-04-26 17:29 UTC (permalink / raw)
To: linux-integrity, linux-kernel, Peter Huewe, Jarkko Sakkinen,
Jason Gunthorpe, Jerry Snitselaar, Stefan Berger,
James Bottomley
Cc: stable, Jason A . Donenfeld
Before sending a TPM command, CLKRUN protocol must be disabled. This is not
done in the case of tpm1_do_selftest() call site inside tpm_tis_resume().
Address this by decorating the calls with tpm_chip_{start,stop}, which arm
and disarm the TPM chip for transmission, and take care of disabling and
re-enabling CLKRUN, among other things.
Cc: stable@vger.kernel.org
Reported-by: Jason A. Donenfeld <Jason@zx2c4.com>
Link: https://lore.kernel.org/linux-integrity/CS68AWILHXS4.3M36M1EKZLUMS@suppilovahvero/
Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
drivers/char/tpm/tpm_tis_core.c | 43 +++++++++++++++------------------
1 file changed, 19 insertions(+), 24 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index c2421162cf34..73707026e358 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1209,25 +1209,20 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
u32 intmask;
int rc;
- if (chip->ops->clk_enable != NULL)
- chip->ops->clk_enable(chip, true);
-
- /* reenable interrupts that device may have lost or
- * BIOS/firmware may have disabled
+ /*
+ * Re-enable interrupts that device may have lost or BIOS/firmware may
+ * have disabled.
*/
rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq);
- if (rc < 0)
- goto out;
+ if (rc < 0) {
+ dev_err(&chip->dev, "Setting IRQ failed.\n");
+ return;
+ }
intmask = priv->int_mask | TPM_GLOBAL_INT_ENABLE;
-
- tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
-
-out:
- if (chip->ops->clk_enable != NULL)
- chip->ops->clk_enable(chip, false);
-
- return;
+ rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
+ if (rc < 0)
+ dev_err(&chip->dev, "Enabling interrupts failed.\n");
}
int tpm_tis_resume(struct device *dev)
@@ -1235,27 +1230,27 @@ int tpm_tis_resume(struct device *dev)
struct tpm_chip *chip = dev_get_drvdata(dev);
int ret;
- ret = tpm_tis_request_locality(chip, 0);
- if (ret < 0)
+ ret = tpm_chip_start(chip);
+ if (ret)
return ret;
if (chip->flags & TPM_CHIP_FLAG_IRQ)
tpm_tis_reenable_interrupts(chip);
- ret = tpm_pm_resume(dev);
- if (ret)
- goto out;
-
/*
* TPM 1.2 requires self-test on resume. This function actually returns
* an error code but for unknown reason it isn't handled.
*/
if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
tpm1_do_selftest(chip);
-out:
- tpm_tis_relinquish_locality(chip, 0);
- return ret;
+ tpm_chip_stop(chip);
+
+ ret = tpm_pm_resume(dev);
+ if (ret)
+ return ret;
+
+ return 0;
}
EXPORT_SYMBOL_GPL(tpm_tis_resume);
#endif
--
2.39.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 2/2] tpm: Prevent hwrng from activating during resume
[not found] <20230426172928.3963287-1-jarkko@kernel.org>
2023-04-26 17:29 ` [PATCH 1/2] tpm_tis: Use tpm_chip_{start,stop} decoration inside tpm_tis_resume Jarkko Sakkinen
@ 2023-04-26 17:29 ` Jarkko Sakkinen
2023-04-27 18:27 ` Jerry Snitselaar
1 sibling, 1 reply; 5+ messages in thread
From: Jarkko Sakkinen @ 2023-04-26 17:29 UTC (permalink / raw)
To: linux-integrity, linux-kernel, Peter Huewe, Jarkko Sakkinen,
Jason Gunthorpe
Cc: stable
Set TPM_CHIP_FLAG_SUSPENDED in tpm_pm_suspend() and reset in
tpm_pm_resume(). While the flag is set, tpm_hwrng() gives back zero bytes.
This prevents hwrng from racing during resume.
Cc: stable@vger.kernel.org
Fixes: 6e592a065d51 ("tpm: Move Linux RNG connection to hwrng")
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
drivers/char/tpm/tpm-chip.c | 4 ++++
drivers/char/tpm/tpm-interface.c | 10 ++++++++++
include/linux/tpm.h | 13 +++++++------
3 files changed, 21 insertions(+), 6 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 6fdfa65a00c3..6f5ee27aeda1 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -572,6 +572,10 @@ static int tpm_hwrng_read(struct hwrng *rng, void *data, size_t max, bool wait)
{
struct tpm_chip *chip = container_of(rng, struct tpm_chip, hwrng);
+ /* Give back zero bytes, as TPM chip has not yet fully resumed: */
+ if (chip->flags & TPM_CHIP_FLAG_SUSPENDED)
+ return 0;
+
return tpm_get_random(chip, data, max);
}
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 7e513b771832..0f941cb32eb1 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -412,6 +412,8 @@ int tpm_pm_suspend(struct device *dev)
}
suspended:
+ chip->flags |= TPM_CHIP_FLAG_SUSPENDED;
+
if (rc)
dev_err(dev, "Ignoring error %d while suspending\n", rc);
return 0;
@@ -429,6 +431,14 @@ int tpm_pm_resume(struct device *dev)
if (chip == NULL)
return -ENODEV;
+ chip->flags &= ~TPM_CHIP_FLAG_SUSPENDED;
+
+ /*
+ * Guarantee that SUSPENDED is written last, so that hwrng does not
+ * activate before the chip has been fully resumed.
+ */
+ wmb();
+
return 0;
}
EXPORT_SYMBOL_GPL(tpm_pm_resume);
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 4dc97b9f65fb..d7073dc45444 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -274,13 +274,14 @@ enum tpm2_cc_attrs {
#define TPM_VID_ATML 0x1114
enum tpm_chip_flags {
- TPM_CHIP_FLAG_TPM2 = BIT(1),
- TPM_CHIP_FLAG_IRQ = BIT(2),
- TPM_CHIP_FLAG_VIRTUAL = BIT(3),
- TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
- TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
+ TPM_CHIP_FLAG_SUSPENDED = BIT(0),
+ TPM_CHIP_FLAG_TPM2 = BIT(1),
+ TPM_CHIP_FLAG_IRQ = BIT(2),
+ TPM_CHIP_FLAG_VIRTUAL = BIT(3),
+ TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
+ TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6),
- TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7),
+ TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7),
};
#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
--
2.39.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] tpm_tis: Use tpm_chip_{start,stop} decoration inside tpm_tis_resume
2023-04-26 17:29 ` [PATCH 1/2] tpm_tis: Use tpm_chip_{start,stop} decoration inside tpm_tis_resume Jarkko Sakkinen
@ 2023-04-27 15:11 ` Jerry Snitselaar
0 siblings, 0 replies; 5+ messages in thread
From: Jerry Snitselaar @ 2023-04-27 15:11 UTC (permalink / raw)
To: Jarkko Sakkinen
Cc: linux-integrity, linux-kernel, Peter Huewe, Jason Gunthorpe,
Stefan Berger, James Bottomley, stable, Jason A . Donenfeld
On Wed, Apr 26, 2023 at 08:29:27PM +0300, Jarkko Sakkinen wrote:
> Before sending a TPM command, CLKRUN protocol must be disabled. This is not
> done in the case of tpm1_do_selftest() call site inside tpm_tis_resume().
>
> Address this by decorating the calls with tpm_chip_{start,stop}, which arm
> and disarm the TPM chip for transmission, and take care of disabling and
> re-enabling CLKRUN, among other things.
>
> Cc: stable@vger.kernel.org
> Reported-by: Jason A. Donenfeld <Jason@zx2c4.com>
> Link: https://lore.kernel.org/linux-integrity/CS68AWILHXS4.3M36M1EKZLUMS@suppilovahvero/
> Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
> ---
> drivers/char/tpm/tpm_tis_core.c | 43 +++++++++++++++------------------
> 1 file changed, 19 insertions(+), 24 deletions(-)
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com
>
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index c2421162cf34..73707026e358 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -1209,25 +1209,20 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
> u32 intmask;
> int rc;
>
> - if (chip->ops->clk_enable != NULL)
> - chip->ops->clk_enable(chip, true);
> -
> - /* reenable interrupts that device may have lost or
> - * BIOS/firmware may have disabled
> + /*
> + * Re-enable interrupts that device may have lost or BIOS/firmware may
> + * have disabled.
> */
> rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq);
> - if (rc < 0)
> - goto out;
> + if (rc < 0) {
> + dev_err(&chip->dev, "Setting IRQ failed.\n");
> + return;
> + }
>
> intmask = priv->int_mask | TPM_GLOBAL_INT_ENABLE;
> -
> - tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
> -
> -out:
> - if (chip->ops->clk_enable != NULL)
> - chip->ops->clk_enable(chip, false);
> -
> - return;
> + rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
> + if (rc < 0)
> + dev_err(&chip->dev, "Enabling interrupts failed.\n");
> }
>
> int tpm_tis_resume(struct device *dev)
> @@ -1235,27 +1230,27 @@ int tpm_tis_resume(struct device *dev)
> struct tpm_chip *chip = dev_get_drvdata(dev);
> int ret;
>
> - ret = tpm_tis_request_locality(chip, 0);
> - if (ret < 0)
> + ret = tpm_chip_start(chip);
> + if (ret)
> return ret;
>
> if (chip->flags & TPM_CHIP_FLAG_IRQ)
> tpm_tis_reenable_interrupts(chip);
>
> - ret = tpm_pm_resume(dev);
> - if (ret)
> - goto out;
> -
> /*
> * TPM 1.2 requires self-test on resume. This function actually returns
> * an error code but for unknown reason it isn't handled.
> */
> if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
> tpm1_do_selftest(chip);
> -out:
> - tpm_tis_relinquish_locality(chip, 0);
>
> - return ret;
> + tpm_chip_stop(chip);
> +
> + ret = tpm_pm_resume(dev);
> + if (ret)
> + return ret;
> +
> + return 0;
> }
> EXPORT_SYMBOL_GPL(tpm_tis_resume);
> #endif
> --
> 2.39.2
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] tpm: Prevent hwrng from activating during resume
2023-04-26 17:29 ` [PATCH 2/2] tpm: Prevent hwrng from activating during resume Jarkko Sakkinen
@ 2023-04-27 18:27 ` Jerry Snitselaar
2023-04-28 13:41 ` Jarkko Sakkinen
0 siblings, 1 reply; 5+ messages in thread
From: Jerry Snitselaar @ 2023-04-27 18:27 UTC (permalink / raw)
To: Jarkko Sakkinen
Cc: linux-integrity, linux-kernel, Peter Huewe, Jason Gunthorpe, stable
On Wed, Apr 26, 2023 at 08:29:28PM +0300, Jarkko Sakkinen wrote:
> Set TPM_CHIP_FLAG_SUSPENDED in tpm_pm_suspend() and reset in
> tpm_pm_resume(). While the flag is set, tpm_hwrng() gives back zero bytes.
> This prevents hwrng from racing during resume.
>
> Cc: stable@vger.kernel.org
> Fixes: 6e592a065d51 ("tpm: Move Linux RNG connection to hwrng")
> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com
> ---
> drivers/char/tpm/tpm-chip.c | 4 ++++
> drivers/char/tpm/tpm-interface.c | 10 ++++++++++
> include/linux/tpm.h | 13 +++++++------
> 3 files changed, 21 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index 6fdfa65a00c3..6f5ee27aeda1 100644
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -572,6 +572,10 @@ static int tpm_hwrng_read(struct hwrng *rng, void *data, size_t max, bool wait)
> {
> struct tpm_chip *chip = container_of(rng, struct tpm_chip, hwrng);
>
> + /* Give back zero bytes, as TPM chip has not yet fully resumed: */
> + if (chip->flags & TPM_CHIP_FLAG_SUSPENDED)
> + return 0;
> +
> return tpm_get_random(chip, data, max);
> }
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 7e513b771832..0f941cb32eb1 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -412,6 +412,8 @@ int tpm_pm_suspend(struct device *dev)
> }
>
> suspended:
> + chip->flags |= TPM_CHIP_FLAG_SUSPENDED;
> +
> if (rc)
> dev_err(dev, "Ignoring error %d while suspending\n", rc);
> return 0;
> @@ -429,6 +431,14 @@ int tpm_pm_resume(struct device *dev)
> if (chip == NULL)
> return -ENODEV;
>
> + chip->flags &= ~TPM_CHIP_FLAG_SUSPENDED;
> +
> + /*
> + * Guarantee that SUSPENDED is written last, so that hwrng does not
> + * activate before the chip has been fully resumed.
> + */
> + wmb();
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(tpm_pm_resume);
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index 4dc97b9f65fb..d7073dc45444 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -274,13 +274,14 @@ enum tpm2_cc_attrs {
> #define TPM_VID_ATML 0x1114
>
> enum tpm_chip_flags {
> - TPM_CHIP_FLAG_TPM2 = BIT(1),
> - TPM_CHIP_FLAG_IRQ = BIT(2),
> - TPM_CHIP_FLAG_VIRTUAL = BIT(3),
> - TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
> - TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
> + TPM_CHIP_FLAG_SUSPENDED = BIT(0),
> + TPM_CHIP_FLAG_TPM2 = BIT(1),
> + TPM_CHIP_FLAG_IRQ = BIT(2),
> + TPM_CHIP_FLAG_VIRTUAL = BIT(3),
> + TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
> + TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
> TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6),
> - TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7),
> + TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7),
> };
>
> #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
> --
> 2.39.2
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] tpm: Prevent hwrng from activating during resume
2023-04-27 18:27 ` Jerry Snitselaar
@ 2023-04-28 13:41 ` Jarkko Sakkinen
0 siblings, 0 replies; 5+ messages in thread
From: Jarkko Sakkinen @ 2023-04-28 13:41 UTC (permalink / raw)
To: Jerry Snitselaar
Cc: linux-integrity, linux-kernel, Peter Huewe, Jason Gunthorpe, stable
On Thu Apr 27, 2023 at 9:27 PM EEST, Jerry Snitselaar wrote:
> On Wed, Apr 26, 2023 at 08:29:28PM +0300, Jarkko Sakkinen wrote:
> > Set TPM_CHIP_FLAG_SUSPENDED in tpm_pm_suspend() and reset in
> > tpm_pm_resume(). While the flag is set, tpm_hwrng() gives back zero bytes.
> > This prevents hwrng from racing during resume.
> >
> > Cc: stable@vger.kernel.org
> > Fixes: 6e592a065d51 ("tpm: Move Linux RNG connection to hwrng")
> > Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
>
>
> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com
Thanks Jerry! I'm planning to schedule these patches to rc2. So any
tested-by's are welcome before that (I'll send it the following week
of rc1 release).
BR, Jarkko
^ permalink raw reply [flat|nested] 5+ messages in thread
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[not found] <20230426172928.3963287-1-jarkko@kernel.org>
2023-04-26 17:29 ` [PATCH 1/2] tpm_tis: Use tpm_chip_{start,stop} decoration inside tpm_tis_resume Jarkko Sakkinen
2023-04-27 15:11 ` Jerry Snitselaar
2023-04-26 17:29 ` [PATCH 2/2] tpm: Prevent hwrng from activating during resume Jarkko Sakkinen
2023-04-27 18:27 ` Jerry Snitselaar
2023-04-28 13:41 ` Jarkko Sakkinen
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