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netlabel: fix a problem when setting bits below the previously lowest bit

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The NetLabel category (catmap) functions have a problem in that they
assume categories will be set in an increasing manner, e.g. the next
category set will always be larger than the last.  Unfortunately, this
is not a valid assumption and could result in problems when attempting
to set categories less than the startbit in the lowest catmap node.
In some cases kernel panics and other nasties can result.

This patch corrects the problem by checking for this and allocating a
new catmap node instance and placing it at the front of the list.

Cc: [email protected]
Reported-by: Christian Evans <[email protected]>
Signed-off-by: Paul Moore <[email protected]>
Tested-by: Casey Schaufler <[email protected]>
This commit is contained in:
Paul Moore 2014-08-01 11:17:03 -04:00
commit 41c3bd2039
4 changed files with 26 additions and 16 deletions
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2
security/smack/smack_access.c
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@ -444,7 +444,7 @@ int smk_netlbl_mls(int level, char *catset, struct netlbl_lsm_secattr *sap,
for (m = 0x80; m != 0; m >>= 1, cat++) {
if ((m & *cp) == 0)
continue;
rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
rc = netlbl_secattr_catmap_setbit(&sap->attr.mls.cat,
cat, GFP_ATOMIC);
if (rc < 0) {
netlbl_secattr_catmap_free(sap->attr.mls.cat);