DPDK-dev Archive on lore.kernel.org
 help / color / Atom feed
From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Stephen Hemminger <sthemmin@microsoft.com>,
	Stephen Hemminger <stephen@networkplumber.org>
Subject: [dpdk-dev] [PATCH v3 6/8] kni: return -EFAULT if copy_from_user fails
Date: Wed, 19 Jun 2019 11:57:44 -0700
Message-ID: <20190619185746.26866-7-stephen@networkplumber.org> (raw)
In-Reply-To: <20190619185746.26866-1-stephen@networkplumber.org>

From: Stephen Hemminger <sthemmin@microsoft.com>

The correct thing to return if user gives a bad data
is to return -EFAULT. Logging is also discouraged because
it could be used as a DoS attack.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 kernel/linux/kni/kni_misc.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/kernel/linux/kni/kni_misc.c b/kernel/linux/kni/kni_misc.c
index b59cf24c2184..be45f823408f 100644
--- a/kernel/linux/kni/kni_misc.c
+++ b/kernel/linux/kni/kni_misc.c
@@ -301,11 +301,8 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num,
 		return -EINVAL;
 
 	/* Copy kni info from user space */
-	ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
-	if (ret) {
-		pr_err("copy_from_user in kni_ioctl_create");
-		return -EIO;
-	}
+	if (copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info)))
+		return -EFAULT;
 
 	/* Check if name is zero-ended */
 	if (strnlen(dev_info.name, sizeof(dev_info.name)) == sizeof(dev_info.name)) {
@@ -427,15 +424,12 @@ kni_ioctl_release(struct net *net, uint32_t ioctl_num,
 	if (_IOC_SIZE(ioctl_num) > sizeof(dev_info))
 		return -EINVAL;
 
-	ret = copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info));
-	if (ret) {
-		pr_err("copy_from_user in kni_ioctl_release");
-		return -EIO;
-	}
+	if (copy_from_user(&dev_info, (void *)ioctl_param, sizeof(dev_info)))
+		return -EFAULT;
 
 	/* Release the network device according to its name */
 	if (strlen(dev_info.name) == 0)
-		return ret;
+		return -EINVAL;
 
 	down_write(&knet->kni_list_lock);
 	list_for_each_entry_safe(dev, n, &knet->kni_list_head, list) {
-- 
2.20.1


  parent reply index

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10 17:51 [dpdk-dev] [PATCH v2 0/7] kni: cleanups and improvements Stephen Hemminger
2019-06-10 17:51 ` [dpdk-dev] [PATCH v2 1/7] kni: don't need stubs for rx_mode or ioctl Stephen Hemminger
2019-06-10 17:51 ` [dpdk-dev] [PATCH v2 2/7] kni: use netdev_alloc_skb Stephen Hemminger
2019-06-10 17:51 ` [dpdk-dev] [PATCH v2 3/7] kni: don't keep stats in kni_net Stephen Hemminger
2019-06-10 17:51 ` [dpdk-dev] [PATCH v2 4/7] kni: drop unused fields Stephen Hemminger
2019-06-10 17:51 ` [dpdk-dev] [PATCH v2 5/7] kni: use proper type for kni fifo's Stephen Hemminger
2019-06-10 17:51 ` [dpdk-dev] [PATCH v2 6/7] kni: return -EFAULT if copy_from_user fails Stephen Hemminger
2019-06-10 17:51 ` [dpdk-dev] [PATCH v2 7/7] doc: update KNI documentation Stephen Hemminger
2019-06-11 20:54 ` [dpdk-dev] [PATCH v2 0/7] kni: cleanups and improvements Stephen Hemminger
2019-06-11 21:18   ` Lance Richardson
2019-06-11 21:30     ` Stephen Hemminger
2019-06-11 21:49       ` Lance Richardson
2019-06-18 16:16 ` [dpdk-dev] [PATCH v3 0/8] kni: fixes and cleanups Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 1/8] kni: don't need stubs for rx_mode or ioctl Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 2/8] kni: use netdev_alloc_skb Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 3/8] kni: don't keep stats in kni_net Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 4/8] kni: drop unused fields Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 5/8] kni: use proper type for kni fifo's Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 6/8] kni: return -EFAULT if copy_from_user fails Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 7/8] doc: update KNI documentation Stephen Hemminger
2019-06-18 16:16   ` [dpdk-dev] [PATCH v3 8/8] kni: fix style issues Stephen Hemminger
2019-06-19 18:57 ` [dpdk-dev] [PATCH v3 0/8] kni: cleanups and fixes Stephen Hemminger
2019-06-19 18:57   ` [dpdk-dev] [PATCH v3 1/8] kni: don't need stubs for rx_mode or ioctl Stephen Hemminger
2019-06-19 18:57   ` [dpdk-dev] [PATCH v3 2/8] kni: use netdev_alloc_skb Stephen Hemminger
2019-06-19 18:57   ` [dpdk-dev] [PATCH v3 3/8] kni: don't keep stats in kni_net Stephen Hemminger
2019-06-19 18:57   ` [dpdk-dev] [PATCH v3 4/8] kni: drop unused fields Stephen Hemminger
2019-06-19 18:57   ` [dpdk-dev] [PATCH v3 5/8] kni: use proper type for kni fifo's Stephen Hemminger
2019-06-19 18:57   ` Stephen Hemminger [this message]
2019-06-19 18:57   ` [dpdk-dev] [PATCH v3 7/8] doc: update KNI documentation Stephen Hemminger
2019-06-19 18:57   ` [dpdk-dev] [PATCH v3 8/8] kni: fix style issues Stephen Hemminger
2019-06-19 18:59 ` [dpdk-dev] [PATCH v4 0/8] kni: fixes and cleanups Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 1/8] kni: don't need stubs for rx_mode or ioctl Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 2/8] kni: use netdev_alloc_skb Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 3/8] kni: don't keep stats in kni_net Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 4/8] kni: drop unused fields Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 5/8] kni: use proper type for kni fifo's Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 6/8] kni: return -EFAULT if copy_from_user fails Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 7/8] doc: update KNI documentation Stephen Hemminger
2019-06-19 18:59   ` [dpdk-dev] [PATCH v4 8/8] kni: fix style issues Stephen Hemminger
2019-06-20 19:20 ` [dpdk-dev] [PATCH v5 0/9] kni: fixes and cleanups Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 1/9] kni: don't need stubs for rx_mode or ioctl Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 2/9] kni: use netdev_alloc_skb Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 3/9] kni: don't keep stats in kni_net Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 4/9] kni: drop unused fields Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 5/9] kni: use proper type for kni fifo's Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 6/9] kni: return -EFAULT if copy_from_user fails Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 7/9] doc: update KNI documentation Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 8/9] kni: fix style issues Stephen Hemminger
2019-06-20 19:20   ` [dpdk-dev] [PATCH v5 9/9] kni: add minimal ethtool Stephen Hemminger
2019-06-21  8:26     ` Igor Ryzhov
2019-06-21 15:10       ` Stephen Hemminger
2019-06-24 16:47 ` [dpdk-dev] [PATCH v6 0/9] kni: fixes and cleanups Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 1/9] kni: don't need stubs for rx_mode or ioctl Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 2/9] kni: use netdev_alloc_skb Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 3/9] kni: don't keep stats in kni_net Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 4/9] kni: drop unused fields Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 5/9] kni: use proper type for kni fifo's Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 6/9] kni: return -EFAULT if copy_from_user fails Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 7/9] kni: fix style issues Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 8/9] kni: add minimal ethtool Stephen Hemminger
2019-06-24 16:47   ` [dpdk-dev] [PATCH v6 9/9] doc: update KNI documentation Stephen Hemminger
2019-07-12 17:03   ` [dpdk-dev] [PATCH v6 0/9] kni: fixes and cleanups Ferruh Yigit
2019-07-15 17:18     ` Thomas Monjalon

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190619185746.26866-7-stephen@networkplumber.org \
    --to=stephen@networkplumber.org \
    --cc=dev@dpdk.org \
    --cc=sthemmin@microsoft.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK-dev Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/dpdk-dev/0 dpdk-dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dpdk-dev dpdk-dev/ https://lore.kernel.org/dpdk-dev \
		dev@dpdk.org dpdk-dev@archiver.kernel.org
	public-inbox-index dpdk-dev


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/ public-inbox