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From: Paolo Bonzini <pbonzini@redhat.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
	kvm@vger.kernel.org, bp@alien8.de, carlo@caione.org,
	catalin.marinas@arm.com, devicetree@vger.kernel.org,
	hpa@zytor.com, jmattson@google.com, joro@8bytes.org,
	khilman@baylibre.com, linux-amlogic@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, mark.rutland@arm.com,
	mingo@redhat.com, narmstrong@baylibre.com, rkrcmar@redhat.com,
	robh+dt@kernel.org, sean.j.christopherson@intel.com,
	syzkaller-bugs@googlegroups.com, tglx@linutronix.de,
	wanpengli@tencent.com, will.deacon@arm.com, x86@kernel.org,
	syzbot <syzbot+46f1dd7dbbe2bfb98b10@syzkaller.appspotmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	USB list <linux-usb@vger.kernel.org>
Subject: Re: KASAN: slab-out-of-bounds Read in handle_vmptrld
Date: Fri, 13 Sep 2019 17:01:22 +0200
Message-ID: <6a0ec3a2-2a52-f67a-6140-e0a60874538a@redhat.com> (raw)
In-Reply-To: <20190913130226.GB403359@kroah.com>

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.

Paolo

  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 [this message]
2019-09-13 15:32             ` Robin Murphy
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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