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keys, trusted: fix: *do not* allow duplicate key options

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

This is problematic because:

* No gain.
* This makes complicated to specify options that are dependent on other
  options.

This patch changes the behavior in a way that option can be specified
only once.

Reported-by: James Morris James Morris <jmorris@namei.org>
Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Peter Huewe <peterhuewe@gmx.de>
This commit is contained in:
Jarkko Sakkinen 2015-12-12 13:19:52 +02:00
parent 6674ff145e
commit 5208cc8342
1 changed files with 3 additions and 0 deletions
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3
security/keys/trusted.c
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@ -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: