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authorDustin Kirkland <dustin.kirkland@us.ibm.com>2006-02-16 13:40:01 -0600
committerAl Viro <viro@zeniv.linux.org.uk>2006-03-20 14:08:55 -0500
commitd9d9ec6e2c45b22282cd36cf92fcb23d504350a8 (patch)
tree88e861cee6de93d931325b9bdb2cd867afc6decd /kernel/auditfilter.c
parent5bdb98868062c1b14025883049551af343233187 (diff)
[PATCH] Fix audit operators
Darrel Goeddel initiated a discussion on IRC regarding the possibility of audit_comparator() returning -EINVAL signaling an invalid operator. It is possible when creating the rule to assure that the operator is one of the 6 sane values. Here's a snip from include/linux/audit.h Note that 0 (nonsense) and 7 (all operators) are not valid values for an operator. ... /* These are the supported operators. * 4 2 1 * = > < * ------- * 0 0 0 0 nonsense * 0 0 1 1 < * 0 1 0 2 > * 0 1 1 3 != * 1 0 0 4 = * 1 0 1 5 <= * 1 1 0 6 >= * 1 1 1 7 all operators */ ... Furthermore, prior to adding these extended operators, flagging the AUDIT_NEGATE bit implied !=, and otherwise == was assumed. The following code forces the operator to be != if the AUDIT_NEGATE bit was flipped on. And if no operator was specified, == is assumed. The only invalid condition is if the AUDIT_NEGATE bit is off and all of the AUDIT_EQUAL, AUDIT_LESS_THAN, and AUDIT_GREATER_THAN bits are on--clearly a nonsensical operator. Now that this is handled at rule insertion time, the default -EINVAL return of audit_comparator() is eliminated such that the function can only return 1 or 0. If this is acceptable, let's get this applied to the current tree. :-Dustin -- Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> (cherry picked from 9bf0a8e137040f87d1b563336d4194e38fb2ba1a commit)
Diffstat (limited to 'kernel/auditfilter.c')
-rw-r--r--kernel/auditfilter.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 35f8fa82bb8b..b85fd8cce11f 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -160,11 +160,17 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
f->val = rule->values[i];
entry->rule.vers_ops = (f->op & AUDIT_OPERATORS) ? 2 : 1;
+
+ /* Support for legacy operators where
+ * AUDIT_NEGATE bit signifies != and otherwise assumes == */
if (f->op & AUDIT_NEGATE)
- f->op |= AUDIT_NOT_EQUAL;
- else if (!(f->op & AUDIT_OPERATORS))
- f->op |= AUDIT_EQUAL;
- f->op &= ~AUDIT_NEGATE;
+ f->op = AUDIT_NOT_EQUAL;
+ else if (!f->op)
+ f->op = AUDIT_EQUAL;
+ else if (f->op == AUDIT_OPERATORS) {
+ err = -EINVAL;
+ goto exit_free;
+ }
}
exit_nofree:
@@ -533,9 +539,9 @@ int audit_comparator(const u32 left, const u32 op, const u32 right)
return (left > right);
case AUDIT_GREATER_THAN_OR_EQUAL:
return (left >= right);
- default:
- return -EINVAL;
}
+ BUG();
+ return 0;
}

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