| Message ID | 20241002035458.24401-1-jlee@suse.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v3] aoe: fix the potential use-after-free problem in more places | expand |
On Wed, Oct 02, 2024 at 11:54:58AM +0800, Chun-Yi Lee wrote: > For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential > use-after-free problem in aoecmd_cfg_pkts") makes tx() calling dev_put() > instead of doing in aoecmd_cfg_pkts(). It avoids that the tx() runs > into use-after-free. > > Then Nicolai Stange found more places in aoe have potential use-after-free > problem with tx(). e.g. revalidate(), aoecmd_ata_rw(), resend(), probe() > and aoecmd_cfg_rsp(). Those functions also use aoenet_xmit() to push > packet to tx queue. So they should also use dev_hold() to increase the > refcnt of skb->dev. > > On the other hand, moving dev_put() to tx() causes that the refcnt of > skb->dev be reduced to a negative value, because corresponding > dev_hold() are not called in revalidate(), aoecmd_ata_rw(), resend(), > probe(), and aoecmd_cfg_rsp(). This patch fixed this issue. > > Link: https://nvd.nist.gov/vuln/detail/CVE-2023-6270 > Fixes: f98364e92662 ("aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts") > Reported-by: Nicolai Stange <nstange@suse.com> > Signed-off-by: Chun-Yi Lee <jlee@suse.com> > --- > Hi, This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree. You are receiving this message because of the following common error(s) as indicated below: - You have marked a patch with a "Fixes:" tag for a commit that is in an older released kernel, yet you do not have a cc: stable line in the signed-off-by area at all, which means that the patch will not be applied to any older kernel releases. To properly fix this, please follow the documented rules in the Documentation/process/stable-kernel-rules.rst file for how to resolve this. If you wish to discuss this problem further, or you have questions about how to resolve this issue, please feel free to respond to this email and Greg will reply once he has dug out from the pending patches received from other developers. thanks, greg k-h's patch email bot
On Wed, 02 Oct 2024 11:54:58 +0800, Chun-Yi Lee wrote: > For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential > use-after-free problem in aoecmd_cfg_pkts") makes tx() calling dev_put() > instead of doing in aoecmd_cfg_pkts(). It avoids that the tx() runs > into use-after-free. > > Then Nicolai Stange found more places in aoe have potential use-after-free > problem with tx(). e.g. revalidate(), aoecmd_ata_rw(), resend(), probe() > and aoecmd_cfg_rsp(). Those functions also use aoenet_xmit() to push > packet to tx queue. So they should also use dev_hold() to increase the > refcnt of skb->dev. > > [...] Applied, thanks! [1/1] aoe: fix the potential use-after-free problem in more places commit: 6d6e54fc71ad1ab0a87047fd9c211e75d86084a3 Best regards,
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index cc9077b588d7..d1f4ddc57645 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -361,6 +361,7 @@ ata_rw_frameinit(struct frame *f) } ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit; + dev_hold(t->ifp->nd); skb->dev = t->ifp->nd; } @@ -401,6 +402,8 @@ aoecmd_ata_rw(struct aoedev *d) __skb_queue_head_init(&queue); __skb_queue_tail(&queue, skb); aoenet_xmit(&queue); + } else { + dev_put(f->t->ifp->nd); } return 1; } @@ -483,10 +486,13 @@ resend(struct aoedev *d, struct frame *f) memcpy(h->dst, t->addr, sizeof h->dst); memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); + dev_hold(t->ifp->nd); skb->dev = t->ifp->nd; skb = skb_clone(skb, GFP_ATOMIC); - if (skb == NULL) + if (skb == NULL) { + dev_put(t->ifp->nd); return; + } f->sent = ktime_get(); __skb_queue_head_init(&queue); __skb_queue_tail(&queue, skb); @@ -617,6 +623,8 @@ probe(struct aoetgt *t) __skb_queue_head_init(&queue); __skb_queue_tail(&queue, skb); aoenet_xmit(&queue); + } else { + dev_put(f->t->ifp->nd); } } @@ -1395,6 +1403,7 @@ aoecmd_ata_id(struct aoedev *d) ah->cmdstat = ATA_CMD_ID_ATA; ah->lba3 = 0xa0; + dev_hold(t->ifp->nd); skb->dev = t->ifp->nd; d->rttavg = RTTAVG_INIT; @@ -1404,6 +1413,8 @@ aoecmd_ata_id(struct aoedev *d) skb = skb_clone(skb, GFP_ATOMIC); if (skb) f->sent = ktime_get(); + else + dev_put(t->ifp->nd); return skb; }
For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts") makes tx() calling dev_put() instead of doing in aoecmd_cfg_pkts(). It avoids that the tx() runs into use-after-free. Then Nicolai Stange found more places in aoe have potential use-after-free problem with tx(). e.g. revalidate(), aoecmd_ata_rw(), resend(), probe() and aoecmd_cfg_rsp(). Those functions also use aoenet_xmit() to push packet to tx queue. So they should also use dev_hold() to increase the refcnt of skb->dev. On the other hand, moving dev_put() to tx() causes that the refcnt of skb->dev be reduced to a negative value, because corresponding dev_hold() are not called in revalidate(), aoecmd_ata_rw(), resend(), probe(), and aoecmd_cfg_rsp(). This patch fixed this issue. Link: https://nvd.nist.gov/vuln/detail/CVE-2023-6270 Fixes: f98364e92662 ("aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts") Reported-by: Nicolai Stange <nstange@suse.com> Signed-off-by: Chun-Yi Lee <jlee@suse.com> --- v3: Improve the patch description v2: - Improve the patch description - Improved wording - Add oneline summary of the commit f98364e92662 - Used curly brackets in the if-else blocks. drivers/block/aoe/aoecmd.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)