lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 02 Jan 2012 22:47:50 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: [PATCH net-next] sch_qfq: accurate wsum handling

We can underestimate q->wsum in case of "tc class replace ... qfq"
and/or qdisc_create_dflt() error.

wsum is not really used in fast path, only at qfq qdisc/class setup,
to catch user error.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Stephen Hemminger <shemminger@...tta.com>
---
 net/sched/sch_qfq.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 1033434..2c5ff61 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -211,6 +211,7 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 	struct nlattr *tb[TCA_QFQ_MAX + 1];
 	u32 weight, lmax, inv_w;
 	int i, err;
+	int delta_w;
 
 	if (tca[TCA_OPTIONS] == NULL) {
 		pr_notice("qfq: no options\n");
@@ -232,9 +233,10 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 
 	inv_w = ONE_FP / weight;
 	weight = ONE_FP / inv_w;
-	if (q->wsum + weight > QFQ_MAX_WSUM) {
+	delta_w = weight - (cl ? ONE_FP / cl->inv_w : 0);
+	if (q->wsum + delta_w > QFQ_MAX_WSUM) {
 		pr_notice("qfq: total weight out of range (%u + %u)\n",
-			  weight, q->wsum);
+			  delta_w, q->wsum);
 		return -EINVAL;
 	}
 
@@ -256,13 +258,12 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 				return err;
 		}
 
-		sch_tree_lock(sch);
-		if (tb[TCA_QFQ_WEIGHT]) {
-			q->wsum = weight - ONE_FP / cl->inv_w;
+		if (inv_w != cl->inv_w) {
+			sch_tree_lock(sch);
+			q->wsum += delta_w;
 			cl->inv_w = inv_w;
+			sch_tree_unlock(sch);
 		}
-		sch_tree_unlock(sch);
-
 		return 0;
 	}
 
@@ -277,7 +278,6 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 	i = qfq_calc_index(cl->inv_w, cl->lmax);
 
 	cl->grp = &q->groups[i];
-	q->wsum += weight;
 
 	cl->qdisc = qdisc_create_dflt(sch->dev_queue,
 				      &pfifo_qdisc_ops, classid);
@@ -294,6 +294,7 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 			return err;
 		}
 	}
+	q->wsum += weight;
 
 	sch_tree_lock(sch);
 	qdisc_class_hash_insert(&q->clhash, &cl->common);


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists