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From: Paolo Bonzini <pbonzini@redhat.com>
To: Robin Murphy <robin.murphy@arm.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: mark.rutland@arm.com, x86@kernel.org, wanpengli@tencent.com,
	kvm@vger.kernel.org, narmstrong@baylibre.com,
	catalin.marinas@arm.com, will.deacon@arm.com, hpa@zytor.com,
	khilman@baylibre.com, joro@8bytes.org, rkrcmar@redhat.com,
	mingo@redhat.com, Dmitry Vyukov <dvyukov@google.com>,
	syzbot <syzbot+46f1dd7dbbe2bfb98b10@syzkaller.appspotmail.com>,
	devicetree@vger.kernel.org, syzkaller-bugs@googlegroups.com,
	robh+dt@kernel.org, bp@alien8.de,
	linux-amlogic@lists.infradead.org, tglx@linutronix.de,
	linux-arm-kernel@lists.infradead.org, jmattson@google.com,
	USB list <linux-usb@vger.kernel.org>,
	linux-kernel@vger.kernel.org, sean.j.christopherson@intel.com,
	carlo@caione.org, Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: KASAN: slab-out-of-bounds Read in handle_vmptrld
Date: Fri, 13 Sep 2019 23:39:03 +0200
Message-ID: <a85cee75-99f9-7de3-6e5c-86f9bb41bca5@redhat.com> (raw)
In-Reply-To: <462660f4-1537-cece-b55f-0ceba0269eb8@arm.com>

On 13/09/19 17:32, Robin Murphy wrote:
> Oh, that bit of usbdev_mmap() is already known to be pretty much totally
> bogus for various reasons - there have been a few threads about it, of
> which I think [1] is both the most recent and the most informative.
> There was another patch[2], but that might have stalled (and might need
> reworking with additional hcd_uses_dma() checks anyway).

Neither is enough, see my reply to Alan.  Memory from kmalloc just
*cannot* be passed down to remap_pfn_range, dma_mmap_coherent or
anything like that.  It's a simple alignment issue.

Paolo

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <000000000000a9d4f705924cff7a@google.com>
     [not found] ` <87lfutei1j.fsf@vitty.brq.redhat.com>
2019-09-12 16:49   ` Paolo Bonzini
2019-09-13  4:46     ` Greg Kroah-Hartman
2019-09-13  7:34       ` Paolo Bonzini
2019-09-13 13:02         ` Greg Kroah-Hartman
2019-09-13 15:01           ` Paolo Bonzini
2019-09-13 15:32             ` Robin Murphy
2019-09-13 21:39               ` Paolo Bonzini [this message]
2019-09-13 15:36             ` Alan Stern
2019-09-13 16:14               ` Paolo Bonzini
2019-10-21 15:47 ` Paolo Bonzini

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