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@xxxxxxxxxxxxxxx
Fixes: 6e592a065d51 ("tpm: Move Linux RNG connection to hwrng")
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
---
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
