linux-kernel - Re: [PATCH] Convert filldir[64]() from __put_user() to unsafe_put

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Message-ID: <CA+8MBb+VKk0aQZaJ+tMbFV7+s37HrQ6pzy4sHDAA3yqS-3nVwA@mail.gmail.com>
Date:   Mon, 7 Oct 2019 11:36:43 -0700
From:   Tony Luck <tony.luck@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Guenter Roeck <linux@...ck-us.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] Convert filldir[64]() from __put_user() to unsafe_put_user()

On Mon, Oct 7, 2019 at 11:28 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Sun, Oct 6, 2019 at 8:11 PM Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > >
> > > The last two should just do user_access_begin()/user_access_end()
> > > instead of access_ok().  __copy_to_user_inatomic() has very few callers as well:
> >
> > Yeah, good points.
>
> Looking at it some more this morning, I think it's actually pretty painful.

Late to this party ,,, but my ia64 console today is full of:

irqbalance(5244): unaligned access to 0x2000000800042f9b, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x2000000800042fbb, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x2000000800042fdb, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x2000000800042ffb, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x200000080004301b, ip=0xa0000001002fef90
ia64_handle_unaligned: 95 callbacks suppressed
irqbalance(5244): unaligned access to 0x2000000800042f9b, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x2000000800042fbb, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x2000000800042fdb, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x2000000800042ffb, ip=0xa0000001002fef90
irqbalance(5244): unaligned access to 0x200000080004301b, ip=0xa0000001002fef90
ia64_handle_unaligned: 95 callbacks suppressed

Those ip's point into filldir64()

-Tony