From: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
To: gregkh@linuxfoundation.org
Cc: alex.dewar90@gmail.com, arnd@arndb.de,
linux-kernel@vger.kernel.org, snovitoll@gmail.com,
syzbot+15ec7391f3d6a1a7cc7d@syzkaller.appspotmail.com
Subject: [PATCH v4] drivers/misc/vmw_vmci: restrict too big queue size in qp_host_alloc_queue
Date: Tue, 9 Feb 2021 16:26:12 +0600 [thread overview]
Message-ID: <20210209102612.2112247-1-snovitoll@gmail.com> (raw)
In-Reply-To: <YCJb0Rc8ruCQIJMM@kroah.com>
syzbot found WARNING in qp_broker_alloc[1] in qp_host_alloc_queue()
when num_pages is 0x100001, giving queue_size + queue_page_size
bigger than KMALLOC_MAX_SIZE for kzalloc(), resulting order >= MAX_ORDER
condition.
queue_size + queue_page_size=0x8000d8, where KMALLOC_MAX_SIZE=0x400000.
[1]
Call Trace:
alloc_pages include/linux/gfp.h:547 [inline]
kmalloc_order+0x40/0x130 mm/slab_common.c:837
kmalloc_order_trace+0x15/0x70 mm/slab_common.c:853
kmalloc_large include/linux/slab.h:481 [inline]
__kmalloc+0x257/0x330 mm/slub.c:3959
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:682 [inline]
qp_host_alloc_queue drivers/misc/vmw_vmci/vmci_queue_pair.c:540 [inline]
qp_broker_create drivers/misc/vmw_vmci/vmci_queue_pair.c:1351 [inline]
qp_broker_alloc+0x936/0x2740 drivers/misc/vmw_vmci/vmci_queue_pair.c:1739
Reported-by: syzbot+15ec7391f3d6a1a7cc7d@syzkaller.appspotmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
---
> This patch does not apply to the tree...
Apologies, it was so stupid from my side.
Tested locally and via syzbot.
v4: made a patch based on commit 65f0d2414b("Merge tag 'sound-5.11-rc4'
of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound")
---
drivers/misc/vmw_vmci/vmci_queue_pair.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index c49065887e8f..024dcdbd9d01 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -537,6 +537,9 @@ static struct vmci_queue *qp_host_alloc_queue(u64 size)
queue_page_size = num_pages * sizeof(*queue->kernel_if->u.h.page);
+ if (queue_size + queue_page_size > KMALLOC_MAX_SIZE)
+ return NULL;
+
queue = kzalloc(queue_size + queue_page_size, GFP_KERNEL);
if (queue) {
queue->q_header = NULL;
--
2.25.1
next prev parent reply other threads:[~2021-02-09 10:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-06 5:34 [PATCH] drivers/misc/vmw_vmci: restrict too big queue size in qp_host_alloc_queue Sabyrzhan Tasbolatov
2021-02-09 8:38 ` Greg KH
2021-02-09 9:31 ` [PATCH v2] drivers/misc/vmw_vmci: restrict too big queue size in Sabyrzhan Tasbolatov
2021-02-09 9:32 ` Alex Dewar
2021-02-09 9:45 ` [PATCH v3] " Sabyrzhan Tasbolatov
2021-02-09 9:54 ` Greg KH
2021-02-09 10:26 ` Sabyrzhan Tasbolatov [this message]
2021-02-09 9:49 ` [PATCH v2] " Greg KH
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