linux-kernel - [PATCH 5.2 09/61] tpm: Actually fail on TPM errors during "get random"

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Message-Id: <20190712121621.125477736@linuxfoundation.org>
Date:   Fri, 12 Jul 2019 14:19:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Phil Baker <baker1tex@...il.com>,
        Craig Robson <craig@...tt.com>,
        Laura Abbott <labbott@...hat.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Bartosz Szczepanek <bsz@...ihalf.com>
Subject: [PATCH 5.2 09/61] tpm: Actually fail on TPM errors during "get random"

From: Kees Cook <keescook@...omium.org>

commit 782779b60faa2fc7ff609ac8ef938260fd792c0f upstream.

A "get random" may fail with a TPM error, but those codes were returned
as-is to the caller, which assumed the result was the number of bytes
that had been written to the target buffer, which could lead to a kernel
heap memory exposure and over-read.

This fixes tpm1_get_random() to mask positive TPM errors into -EIO, as
before.

[   18.092103] tpm tpm0: A TPM error (379) occurred attempting get random
[   18.092106] usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-64' (offset 0, size 379)!

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1650989
Reported-by: Phil Baker <baker1tex@...il.com>
Reported-by: Craig Robson <craig@...tt.com>
Fixes: 7aee9c52d7ac ("tpm: tpm1: rewrite tpm1_get_random() using tpm_buf structure")
Cc: Laura Abbott <labbott@...hat.com>
Cc: Tomas Winkler <tomas.winkler@...el.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc: stable@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Tomas Winkler <tomas.winkler@...el.com>
Tested-by: Bartosz Szczepanek <bsz@...ihalf.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/char/tpm/tpm1-cmd.c |    7 +++++--
 drivers/char/tpm/tpm2-cmd.c |    7 +++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -510,7 +510,7 @@ struct tpm1_get_random_out {
  *
  * Return:
  * *  number of bytes read
- * * -errno or a TPM return code otherwise
+ * * -errno (positive TPM return codes are masked to -EIO)
  */
 int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
 {
@@ -531,8 +531,11 @@ int tpm1_get_random(struct tpm_chip *chi
 
 		rc = tpm_transmit_cmd(chip, &buf, sizeof(out->rng_data_len),
 				      "attempting get random");
-		if (rc)
+		if (rc) {
+			if (rc > 0)
+				rc = -EIO;
 			goto out;
+		}
 
 		out = (struct tpm1_get_random_out *)&buf.data[TPM_HEADER_SIZE];
 
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -297,7 +297,7 @@ struct tpm2_get_random_out {
  *
  * Return:
  *   size of the buffer on success,
- *   -errno otherwise
+ *   -errno otherwise (positive TPM return codes are masked to -EIO)
  */
 int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
 {
@@ -324,8 +324,11 @@ int tpm2_get_random(struct tpm_chip *chi
 				       offsetof(struct tpm2_get_random_out,
 						buffer),
 				       "attempting get random");
-		if (err)
+		if (err) {
+			if (err > 0)
+				err = -EIO;
 			goto out;
+		}
 
 		out = (struct tpm2_get_random_out *)
 			&buf.data[TPM_HEADER_SIZE];