| Message ID | 20181108141541.12832-5-jarkko.sakkinen@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Remove nested TPM operations | expand |
On 11/8/18 9:15 AM, Jarkko Sakkinen wrote: > Always call tpm2_flush_space() on failure in tpm_try_transmit() so that > the volatile memory of the TPM gets cleared. If /dev/tpm0 does not have > sufficient permissions (usually it has), this could lead to the leakage > of TPM objects. Through /dev/tpmrm0 this issue does not raise any new > security concerns. > > Cc: stable@vger.kernel.org > Fixes: 745b361e989a ("tpm:tpm: infrastructure for TPM spaces") > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com> > --- > drivers/char/tpm/tpm-interface.c | 33 +++++++++++++++----------------- > drivers/char/tpm/tpm.h | 1 + > drivers/char/tpm/tpm2-space.c | 2 +- > 3 files changed, 17 insertions(+), 19 deletions(-) > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c > index 64510ed81b46..c9efd1b9fd2c 100644 > --- a/drivers/char/tpm/tpm-interface.c > +++ b/drivers/char/tpm/tpm-interface.c > @@ -224,14 +224,14 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, > > rc = tpm2_prepare_space(chip, space, ordinal, buf); > if (rc) > - goto out; > + goto out_idle; > > rc = chip->ops->send(chip, buf, count); > if (rc < 0) { > if (rc != -EPIPE) > dev_err(&chip->dev, > "%s: tpm_send: error %d\n", __func__, rc); > - goto out; > + goto out_space; > } > > if (chip->flags & TPM_CHIP_FLAG_IRQ) > @@ -247,7 +247,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, > if (chip->ops->req_canceled(chip, status)) { > dev_err(&chip->dev, "Operation Canceled\n"); > rc = -ECANCELED; > - goto out; > + goto out_space; > } > > tpm_msleep(TPM_TIMEOUT_POLL); > @@ -257,30 +257,27 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, > chip->ops->cancel(chip); > dev_err(&chip->dev, "Operation Timed out\n"); > rc = -ETIME; > - goto out; > + goto out_space; > > out_recv: > len = chip->ops->recv(chip, buf, bufsiz); > if (len < 0) { > rc = len; > - dev_err(&chip->dev, > - "tpm_transmit: tpm_recv: error %d\n", rc); > - goto out; > - } else if (len < TPM_HEADER_SIZE) { > + dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc); > + } else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length)) > rc = -EFAULT; > - goto out; > - } > > - if (len != be32_to_cpu(header->length)) { > - rc = -EFAULT; > - goto out; > +out_space: > + if (rc) { > + tpm2_flush_space(chip); > + } else { > + rc = tpm2_commit_space(chip, space, ordinal, buf, &len); > + if (rc) > + dev_err(&chip->dev, "tpm2_commit_space: error %d\n", > + rc); > } > > - rc = tpm2_commit_space(chip, space, ordinal, buf, &len); > - if (rc) > - dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc); > - > -out: > +out_idle: > /* may fail but do not override previous error value in rc */ > tpm_go_idle(chip, flags); > > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h > index 49bca4d1e786..229ac42b644e 100644 > --- a/drivers/char/tpm/tpm.h > +++ b/drivers/char/tpm/tpm.h > @@ -579,6 +579,7 @@ int tpm2_probe(struct tpm_chip *chip); > int tpm2_find_cc(struct tpm_chip *chip, u32 cc); > int tpm2_init_space(struct tpm_space *space); > void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space); > +void tpm2_flush_space(struct tpm_chip *chip); > int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc, > u8 *cmd); > int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, > diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c > index 1131a8e7b79b..d53c882268ff 100644 > --- a/drivers/char/tpm/tpm2-space.c > +++ b/drivers/char/tpm/tpm2-space.c > @@ -162,7 +162,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf, > return 0; > } > > -static void tpm2_flush_space(struct tpm_chip *chip) > +void tpm2_flush_space(struct tpm_chip *chip) > { > struct tpm_space *space = &chip->work_space; > int i;
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 64510ed81b46..c9efd1b9fd2c 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -224,14 +224,14 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, rc = tpm2_prepare_space(chip, space, ordinal, buf); if (rc) - goto out; + goto out_idle; rc = chip->ops->send(chip, buf, count); if (rc < 0) { if (rc != -EPIPE) dev_err(&chip->dev, "%s: tpm_send: error %d\n", __func__, rc); - goto out; + goto out_space; } if (chip->flags & TPM_CHIP_FLAG_IRQ) @@ -247,7 +247,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, if (chip->ops->req_canceled(chip, status)) { dev_err(&chip->dev, "Operation Canceled\n"); rc = -ECANCELED; - goto out; + goto out_space; } tpm_msleep(TPM_TIMEOUT_POLL); @@ -257,30 +257,27 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, chip->ops->cancel(chip); dev_err(&chip->dev, "Operation Timed out\n"); rc = -ETIME; - goto out; + goto out_space; out_recv: len = chip->ops->recv(chip, buf, bufsiz); if (len < 0) { rc = len; - dev_err(&chip->dev, - "tpm_transmit: tpm_recv: error %d\n", rc); - goto out; - } else if (len < TPM_HEADER_SIZE) { + dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc); + } else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length)) rc = -EFAULT; - goto out; - } - if (len != be32_to_cpu(header->length)) { - rc = -EFAULT; - goto out; +out_space: + if (rc) { + tpm2_flush_space(chip); + } else { + rc = tpm2_commit_space(chip, space, ordinal, buf, &len); + if (rc) + dev_err(&chip->dev, "tpm2_commit_space: error %d\n", + rc); } - rc = tpm2_commit_space(chip, space, ordinal, buf, &len); - if (rc) - dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc); - -out: +out_idle: /* may fail but do not override previous error value in rc */ tpm_go_idle(chip, flags); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 49bca4d1e786..229ac42b644e 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -579,6 +579,7 @@ int tpm2_probe(struct tpm_chip *chip); int tpm2_find_cc(struct tpm_chip *chip, u32 cc); int tpm2_init_space(struct tpm_space *space); void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space); +void tpm2_flush_space(struct tpm_chip *chip); int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc, u8 *cmd); int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c index 1131a8e7b79b..d53c882268ff 100644 --- a/drivers/char/tpm/tpm2-space.c +++ b/drivers/char/tpm/tpm2-space.c @@ -162,7 +162,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf, return 0; } -static void tpm2_flush_space(struct tpm_chip *chip) +void tpm2_flush_space(struct tpm_chip *chip) { struct tpm_space *space = &chip->work_space; int i;
Always call tpm2_flush_space() on failure in tpm_try_transmit() so that the volatile memory of the TPM gets cleared. If /dev/tpm0 does not have sufficient permissions (usually it has), this could lead to the leakage of TPM objects. Through /dev/tpmrm0 this issue does not raise any new security concerns. Cc: stable@vger.kernel.org Fixes: 745b361e989a ("tpm:tpm: infrastructure for TPM spaces") Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> --- drivers/char/tpm/tpm-interface.c | 33 +++++++++++++++----------------- drivers/char/tpm/tpm.h | 1 + drivers/char/tpm/tpm2-space.c | 2 +- 3 files changed, 17 insertions(+), 19 deletions(-)