From: Greg KH <gregkh@linuxfoundation.org>
To: Zubin Mithra <zsm@chromium.org>
Cc: stable@vger.kernel.org, groeck@chromium.org, axboe@kernel.dk,
hch@lst.de, ming.lei@redhat.com, osandov@fb.com
Subject: Re: 3d75ca0adef4 ("block: introduce multi-page bvec helpers")
Date: Mon, 8 Nov 2021 08:01:35 +0100 [thread overview]
Message-ID: <YYjLT4wUIbK5T1ez@kroah.com> (raw)
In-Reply-To: <YYVZBuDaWBKT3vOS@google.com>
On Fri, Nov 05, 2021 at 09:17:10AM -0700, Zubin Mithra wrote:
> Hello,
>
> A Syzkaller PoC causes a GPF with the following stacktrace in linux-4.14.y and linux-4.19.y.
>
> BUG: KASAN: null-ptr-deref in get_page+0xf/0x65
> Read of size 8 at addr 0000000000000008 by task poc2/3395
>
> CPU: 0 PID: 3395 Comm: poc2 Not tainted 4.19.214-00936-g38ec06730e44 #59
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
> Call Trace:
> dump_stack+0xe7/0x131
> kasan_report+0x22a/0x272
> get_page+0xf/0x65
> submit_page_section+0xf4/0x202
> do_blockdev_direct_IO+0xb90/0xfb9
> ? dio_set_defer_completion+0x57/0x57
> ? lock_is_held_type+0x78/0x86
> ? jbd2_journal_stop+0x6fa/0x742
> ? ext4_get_block_trans+0x188/0x188
> ? lock_downgrade+0x29a/0x29a
> ? __blockdev_direct_IO+0x52/0x93
> ? do_journal_get_write_access+0x7b/0x7b
> ext4_direct_IO+0x4eb/0x7ad
> ? ext4_get_block_trans+0x188/0x188
> generic_file_direct_write+0x132/0x1d8
> __generic_file_write_iter+0xa6/0x1c0
> ? generic_write_checks+0x173/0x19d
> ext4_file_write_iter+0x450/0x549
> ? ext4_unwritten_wait+0x153/0x153
> ? iter_file_splice_write+0x11a/0x4d7
> ? lock_acquire+0x1a7/0x1e7
> ? iter_file_splice_write+0x11a/0x4d7
> ? lock_acquire+0x1b7/0x1e7
> ? match_held_lock+0x2e/0x102
> ? __lock_is_held+0x2a/0x87
> do_iter_readv_writev+0x145/0x1b1
> ? file_start_write.isra.0+0x34/0x34
> ? avc_policy_seqno+0x1d/0x25
> ? selinux_file_permission+0xce/0x115
> do_iter_write+0xa6/0xe6
> iter_file_splice_write+0x337/0x4d7
> ? __do_compat_sys_vmsplice+0x16c/0x16c
> ? match_held_lock+0x2e/0x102
> ? lock_is_held_type+0x78/0x86
> __do_sys_splice+0x6cc/0x8f6
> ? ipipe_prep.part.0+0x99/0x99
> ? mark_held_locks+0x2d/0x84
> ? do_syscall_64+0x14/0x90
> do_syscall_64+0x74/0x90
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x43f579
>
> Could the following patch be applied to linux-4.19.y and linux-4.14.y?
> linux-5.4.y has this commit.
> 3d75ca0adef4 ("block: introduce multi-page bvec helpers")
>
> Tests run:
> * Syzkaller reproducer
> * Chrome OS tryjobs
Now queued up, thanks.
greg k-h
prev parent reply other threads:[~2021-11-08 7:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-05 16:17 3d75ca0adef4 ("block: introduce multi-page bvec helpers") Zubin Mithra
2021-11-08 7:01 ` Greg KH [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YYjLT4wUIbK5T1ez@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=axboe@kernel.dk \
--cc=groeck@chromium.org \
--cc=hch@lst.de \
--cc=ming.lei@redhat.com \
--cc=osandov@fb.com \
--cc=stable@vger.kernel.org \
--cc=zsm@chromium.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.