From: Alan Stern <stern@rowland.harvard.edu>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: mark.rutland@arm.com, x86@kernel.org, wanpengli@tencent.com,
kvm@vger.kernel.org, rkrcmar@redhat.com, catalin.marinas@arm.com,
will.deacon@arm.com, hpa@zytor.com, khilman@baylibre.com,
joro@8bytes.org, narmstrong@baylibre.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,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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 11:36:30 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1909131129390.1466-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <6a0ec3a2-2a52-f67a-6140-e0a60874538a@redhat.com>
On Fri, 13 Sep 2019, 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.
Have you seen
https://marc.info/?l=linux-usb&m=156758511218419&w=2
? It certainly is relevant, although Greg hasn't replied to it.
There have been other messages on the mailing list about this issue,
but I haven't tried to keep track of them.
Also, just warning about a non-page-aligned allocation doesn't really
help. It would be better to fix the misbehaving allocator.
Alan Stern
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next prev parent reply other threads:[~2019-09-13 15:36 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-11 20:38 KASAN: slab-out-of-bounds Read in handle_vmptrld syzbot
2019-09-12 12:25 ` Will Deacon
2019-09-12 13:54 ` Vitaly Kuznetsov
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
2019-09-13 15:36 ` Alan Stern [this message]
2019-09-13 16:14 ` Paolo Bonzini
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