linux-kernel - [PATCH] KVM: Enhance the coalesced_mmio_write() parameter to avoid stack buffer overflow

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, 12 Apr 2010 09:57:14 +0800
From:	wzt.wzt@...il.com
To:	linux-kernel@...r.kernel.org
Cc:	avi@...hat.com, mtosatti@...hat.com, kvm@...r.kernel.org
Subject: [PATCH] KVM: Enhance the coalesced_mmio_write() parameter to avoid stack buffer overflow

coalesced_mmio_write() is not check the len value, if len is negative,
memcpy(ring->coalesced_mmio[ring->last].data, val, len); will cause
stack buffer overflow.

Signed-off-by: Zhitong Wang <zhitong.wangzt@...baba-inc.com>

---
 virt/kvm/coalesced_mmio.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index c0dcfb7..eb4601c 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -61,6 +61,10 @@ static int coalesced_mmio_write(struct kvm_io_device *this,
 {
 	struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
 	struct kvm_coalesced_mmio_ring *ring = dev->kvm->coalesced_mmio_ring;
+
+	if (len < 0)
+		return -EOPNOTSUPP;
+
 	if (!coalesced_mmio_in_range(dev, addr, len))
 		return -EOPNOTSUPP;
 
-- 
1.6.5.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/