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From: Robin Murphy <robin.murphy@arm.com>
To: Paolo Bonzini <pbonzini@redhat.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 16:32:48 +0100
Message-ID: <462660f4-1537-cece-b55f-0ceba0269eb8@arm.com> (raw)
In-Reply-To: <6a0ec3a2-2a52-f67a-6140-e0a60874538a@redhat.com>

On 13/09/2019 16:01, Paolo Bonzini wrote:
> On 13/09/19 15:02, Greg Kroah-Hartman wrote:
>> Look at linux-next, we "should" have fixed up hcd_buffer_alloc() now to
>> not need this type of thing.  If we got it wrong, please let us know and
>> then yes, a fix like this would be most appreciated :)
> 
> I still see
> 
> 	/* some USB hosts just use PIO */
> 	if (!hcd_uses_dma(hcd)) {
> 		*dma = ~(dma_addr_t) 0;
> 		return kmalloc(size, mem_flags);
> 	}
> 
> in linux-next's hcd_buffer_alloc and also in usb.git's usb-next branch.
>   I also see the same
> 
> 	if (remap_pfn_range(vma, vma->vm_start,
> 			virt_to_phys(usbm->mem) >> PAGE_SHIFT,
> 			size, vma->vm_page_prot) < 0) {
> 		...
> 	}
> 
> in usbdev_mmap.  Of course it's possible that I'm looking at the wrong
> branch, or just being dense.

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).

Robin.

[1] 
https://lore.kernel.org/linux-arm-kernel/20190808084636.GB15080@priv-mua.localdomain/
[2] 
https://lore.kernel.org/linux-usb/20190801220134.3295-1-gavinli@thegavinli.com/

  reply index

Thread overview: 9+ 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 [this message]
2019-09-13 21:39               ` Paolo Bonzini
2019-09-13 15:36             ` Alan Stern
2019-09-13 16:14               ` Paolo Bonzini

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