linux-kernel - [PATCH v2 1/3] keys, trusted: fix: *do not* allow duplicate key options

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Date:	Sun, 13 Dec 2015 17:42:29 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	David Howells <dhowells@...hat.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Jonathan Corbet <corbet@....net>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	David Safford <safford@...ibm.com>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	linux-security-module@...r.kernel.org (open list:KEYS-TRUSTED),
	keyrings@...r.kernel.org (open list:KEYS-TRUSTED),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 1/3] keys, trusted: fix: *do not* allow duplicate key options

The trusted keys option parsing allows specifying the same option
multiple times. The last option value specified is used.

This can be seen as a regression because:

* No gain.
* Could be problematic if there is be options dependent on other
  options.

Reported-by: James Morris James Morris <jmorris@...ei.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 security/keys/trusted.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index 903dace..7c183c7 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -736,11 +736,14 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 	int res;
 	unsigned long handle;
 	unsigned long lock;
+	unsigned long token_mask = 0;
 
 	while ((p = strsep(&c, " \t"))) {
 		if (*p == '\0' || *p == ' ' || *p == '\t')
 			continue;
 		token = match_token(p, key_tokens, args);
+		if (test_and_set_bit(token, &token_mask))
+			return -EINVAL;
 
 		switch (token) {
 		case Opt_pcrinfo:
-- 
2.5.0

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