linux-kernel - [PATCH 1/2] tpm_vtpm_proxy: fix address space of a user pointer in vtpmx_fops

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Message-Id: <1466174369-7140-2-git-send-email-jarkko.sakkinen@linux.intel.com>
Date:	Fri, 17 Jun 2016 16:39:28 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Peter Huewe <peterhuewe@....de>
Cc:	linux-security-module@...r.kernel.org,
	Stefan Berger <stefanb@...ux.vnet.ibm.com>,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Marcel Selhorst <tpmdd@...horst.net>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	tpmdd-devel@...ts.sourceforge.net (moderated list:TPM DEVICE DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/2] tpm_vtpm_proxy: fix address space of a user pointer in vtpmx_fops_ioctl()

When running make C=2 M=drivers/char/tpm/

  CC [M]  drivers/char/tpm//tpm_crb.o
  CHECK   drivers/char/tpm//tpm_vtpm_proxy.c
drivers/char/tpm//tpm_vtpm_proxy.c:552:32: warning: incorrect type in assignment (different address spaces)
drivers/char/tpm//tpm_vtpm_proxy.c:552:32:    expected struct vtpm_proxy_new_dev *vtpm_new_dev_p
drivers/char/tpm//tpm_vtpm_proxy.c:552:32:    got void [noderef] <asn:1>*argp
drivers/char/tpm//tpm_vtpm_proxy.c:553:51: warning: incorrect type in argument 2 (different address spaces)
drivers/char/tpm//tpm_vtpm_proxy.c:553:51:    expected void const [noderef] <asn:1>*from
drivers/char/tpm//tpm_vtpm_proxy.c:553:51:    got struct vtpm_proxy_new_dev *vtpm_new_dev_p
drivers/char/tpm//tpm_vtpm_proxy.c:559:34: warning: incorrect type in argument 1 (different address spaces)
drivers/char/tpm//tpm_vtpm_proxy.c:559:34:    expected void [noderef] <asn:1>*to
drivers/char/tpm//tpm_vtpm_proxy.c:559:34:    got struct vtpm_proxy_new_dev *vtpm_new_dev_p

The __user annotation was missing from the corresponding variable.

Fixes: 794c38e01358 ("tpm: Proxy driver for supporting multiple emulated TPMs")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Tested-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
---
 drivers/char/tpm/tpm_vtpm_proxy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
index 4384042..86e27e8 100644
--- a/drivers/char/tpm/tpm_vtpm_proxy.c
+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
@@ -541,7 +541,7 @@ static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
 				   unsigned long arg)
 {
 	void __user *argp = (void __user *)arg;
-	struct vtpm_proxy_new_dev *vtpm_new_dev_p;
+	struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
 	struct vtpm_proxy_new_dev vtpm_new_dev;
 	struct file *file;
 
-- 
2.7.4