From: Linus Torvalds <torvalds@linux-foundation.org>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot+2a831e062bb4aebd8755@syzkaller.appspotmail.com,
Eric Van Hensbergen <ericvh@gmail.com>,
Ron Minnich <rminnich@sandia.gov>,
Latchesar Ionkov <lucho@ionkov.net>, Jens Axboe <axboe@kernel.dk>,
Bart Van Assche <bart.vanassche@wdc.com>,
David Miller <davem@davemloft.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
Sagi Grimberg <sagi@grimberg.me>,
syzkaller-bugs@googlegroups.com,
kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: general protection fault in in_aton
Date: Tue, 10 Jul 2018 13:15:02 -0700 [thread overview]
Message-ID: <CA+55aFz1GVHUGiX1SE_5C-e9LdXdx3pBB10zwga1LOy6axk5Ww@mail.gmail.com> (raw)
In-Reply-To: <CACT4Y+bOJx+SnkMqzDDUTU1iztQ7DpMBG7Z-oV5wArRaSEzh+Q@mail.gmail.com>
On Tue, Jul 10, 2018 at 12:57 PM Dmitry Vyukov <dvyukov@google.com> wrote:
>
> Is it really hard to get fault address? I know that userspace
> generally receives fault address in siginfo.
For an actual page fault it's trivial.
However, for invalid addresses (aka "non-canonical"), you don't even
get a page fault, you get a GP like in this case. And then the actual
address is not available.
Linus
next prev parent reply other threads:[~2018-07-10 20:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 19:19 general protection fault in in_aton syzbot
2018-07-10 19:44 ` Linus Torvalds
2018-07-10 19:56 ` Dmitry Vyukov
2018-07-10 20:15 ` Linus Torvalds [this message]
2018-07-11 16:47 ` Dmitry Vyukov
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