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Smack: don't show empty rules when /smack/load or /smack/load2 is read

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This patch removes empty rules (i.e. with access set to '-') from the
rule list presented to user space.

Smack by design never removes labels nor rules from its lists. Access
for a rule may be set to '-' to effectively disable it. Such rules would
show up in the listing generated when /smack/load or /smack/load2 is
read. This may cause clutter if many rules were disabled.

As a rule with access set to '-' is equivalent to no rule at all, they
may be safely hidden from the listing.

Targeted for git://git.gitorious.org/smack-next/kernel.git

Signed-off-by: Rafal Krypa <r.krypa@samsung.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Rafal Krypa 2012-07-09 19:36:34 +02:00 committed by Casey Schaufler
parent 3518721a89
commit 65ee7f45cf
1 changed files with 3 additions and 2 deletions
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5
security/smack/smackfs.c
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@ -518,6 +518,9 @@ static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max)
return;
if (srp->smk_access == 0)
return;
seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object);
seq_putc(s, ' ');
@ -532,8 +535,6 @@ static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
seq_putc(s, 'a');
if (srp->smk_access & MAY_TRANSMUTE)
seq_putc(s, 't');
if (srp->smk_access == 0)
seq_putc(s, '-');
seq_putc(s, '\n');
}