From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, stable@kernel.org,
Jan Kara <jack@suse.cz>, Ritesh Harjani <riteshh@linux.ibm.com>,
Theodore Tso <tytso@mit.edu>,
syzbot+afa2ca5171d93e44b348@syzkaller.appspotmail.com
Subject: [PATCH 5.17 31/39] jbd2: fix use-after-free of transaction_t race
Date: Fri, 25 Mar 2022 16:14:46 +0100 [thread overview]
Message-ID: <20220325150421.134448886@linuxfoundation.org> (raw)
In-Reply-To: <20220325150420.245733653@linuxfoundation.org>
From: Ritesh Harjani <riteshh@linux.ibm.com>
commit cc16eecae687912238ee6efbff71ad31e2bc414e upstream.
jbd2_journal_wait_updates() is called with j_state_lock held. But if
there is a commit in progress, then this transaction might get committed
and freed via jbd2_journal_commit_transaction() ->
jbd2_journal_free_transaction(), when we release j_state_lock.
So check for journal->j_running_transaction everytime we release and
acquire j_state_lock to avoid use-after-free issue.
Link: https://lore.kernel.org/r/948c2fed518ae739db6a8f7f83f1d58b504f87d0.1644497105.git.ritesh.list@gmail.com
Fixes: 4f98186848707f53 ("jbd2: refactor wait logic for transaction updates into a common function")
Cc: stable@kernel.org
Reported-and-tested-by: syzbot+afa2ca5171d93e44b348@syzkaller.appspotmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/jbd2/transaction.c | 41 +++++++++++++++++++++++++----------------
1 file changed, 25 insertions(+), 16 deletions(-)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -842,27 +842,38 @@ EXPORT_SYMBOL(jbd2_journal_restart);
*/
void jbd2_journal_wait_updates(journal_t *journal)
{
- transaction_t *commit_transaction = journal->j_running_transaction;
+ DEFINE_WAIT(wait);
- if (!commit_transaction)
- return;
+ while (1) {
+ /*
+ * Note that the running transaction can get freed under us if
+ * this transaction is getting committed in
+ * jbd2_journal_commit_transaction() ->
+ * jbd2_journal_free_transaction(). This can only happen when we
+ * release j_state_lock -> schedule() -> acquire j_state_lock.
+ * Hence we should everytime retrieve new j_running_transaction
+ * value (after j_state_lock release acquire cycle), else it may
+ * lead to use-after-free of old freed transaction.
+ */
+ transaction_t *transaction = journal->j_running_transaction;
- spin_lock(&commit_transaction->t_handle_lock);
- while (atomic_read(&commit_transaction->t_updates)) {
- DEFINE_WAIT(wait);
+ if (!transaction)
+ break;
+ spin_lock(&transaction->t_handle_lock);
prepare_to_wait(&journal->j_wait_updates, &wait,
- TASK_UNINTERRUPTIBLE);
- if (atomic_read(&commit_transaction->t_updates)) {
- spin_unlock(&commit_transaction->t_handle_lock);
- write_unlock(&journal->j_state_lock);
- schedule();
- write_lock(&journal->j_state_lock);
- spin_lock(&commit_transaction->t_handle_lock);
+ TASK_UNINTERRUPTIBLE);
+ if (!atomic_read(&transaction->t_updates)) {
+ spin_unlock(&transaction->t_handle_lock);
+ finish_wait(&journal->j_wait_updates, &wait);
+ break;
}
+ spin_unlock(&transaction->t_handle_lock);
+ write_unlock(&journal->j_state_lock);
+ schedule();
finish_wait(&journal->j_wait_updates, &wait);
+ write_lock(&journal->j_state_lock);
}
- spin_unlock(&commit_transaction->t_handle_lock);
}
/**
@@ -877,8 +888,6 @@ void jbd2_journal_wait_updates(journal_t
*/
void jbd2_journal_lock_updates(journal_t *journal)
{
- DEFINE_WAIT(wait);
-
jbd2_might_wait_for_commit(journal);
write_lock(&journal->j_state_lock);
next prev parent reply other threads:[~2022-03-25 15:27 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-25 15:14 [PATCH 5.17 00/39] 5.17.1-rc1 review Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 01/39] tpm: Fix error handling in async work Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 02/39] Bluetooth: btusb: Add another Realtek 8761BU Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 03/39] llc: fix netdevice reference leaks in llc_ui_bind() Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 04/39] ASoC: sti: Fix deadlock via snd_pcm_stop_xrun() call Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 05/39] ALSA: oss: Fix PCM OSS buffer allocation overflow Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 06/39] ALSA: usb-audio: add mapping for new Corsair Virtuoso SE Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 07/39] ALSA: hda/realtek: Add quirk for Clevo NP70PNJ Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 08/39] ALSA: hda/realtek: Add quirk for Clevo NP50PNJ Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 09/39] ALSA: hda/realtek - Fix headset mic problem for a HP machine with alc671 Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 10/39] ALSA: hda/realtek: Add quirk for ASUS GA402 Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 11/39] ALSA: pcm: Fix races among concurrent hw_params and hw_free calls Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 12/39] ALSA: pcm: Fix races among concurrent read/write and buffer changes Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 13/39] ALSA: pcm: Fix races among concurrent prepare and hw_params/hw_free calls Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 14/39] ALSA: pcm: Fix races among concurrent prealloc proc writes Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 15/39] ALSA: pcm: Add stream lock during PCM reset ioctl operations Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 16/39] ALSA: usb-audio: Add mute TLV for playback volumes on RODE NT-USB Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 17/39] ALSA: cmipci: Restore aux vol on suspend/resume Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 18/39] ALSA: pci: fix reading of swapped values from pcmreg in AC97 codec Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 19/39] drivers: net: xgene: Fix regression in CRC stripping Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 20/39] netfilter: nf_tables: initialize registers in nft_do_chain() Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 21/39] netfilter: nf_tables: validate registers coming from userspace Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 22/39] ACPI / x86: Work around broken XSDT on Advantech DAC-BJ01 board Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 23/39] ACPI: battery: Add device HID and quirk for Microsoft Surface Go 3 Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 24/39] ACPI: video: Force backlight native for Clevo NL5xRU and NL5xNU Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 25/39] crypto: qat - disable registration of algorithms Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 26/39] Bluetooth: btusb: Add one more Bluetooth part for the Realtek RTL8852AE Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 27/39] Bluetooth: hci_sync: Add a new quirk to skip HCI_FLT_CLEAR_ALL Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 28/39] Bluetooth: btusb: Use quirk to skip HCI_FLT_CLEAR_ALL on fake CSR controllers Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 29/39] Revert "ath: add support for special 0x0 regulatory domain" Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 30/39] drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_free() Greg Kroah-Hartman
2022-03-25 15:14 ` Greg Kroah-Hartman [this message]
2022-03-25 15:14 ` [PATCH 5.17 32/39] rcu: Dont deboost before reporting expedited quiescent state Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 33/39] uaccess: fix integer overflow on access_ok() Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 34/39] mac80211: fix potential double free on mesh join Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 35/39] tpm: fix reference counting for struct tpm_chip Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 36/39] tpm: use try_get_ops() in tpm-space.c Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 37/39] wcn36xx: Differentiate wcn3660 from wcn3620 Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 38/39] m68k: fix access_ok for coldfire Greg Kroah-Hartman
2022-03-25 15:14 ` [PATCH 5.17 39/39] nds32: fix access_ok() checks in get/put_user Greg Kroah-Hartman
2022-03-25 23:22 ` [PATCH 5.17 00/39] 5.17.1-rc1 review Shuah Khan
2022-03-26 1:22 ` Fox Chen
2022-03-26 2:53 ` Rudi Heitbaum
2022-03-26 3:07 ` Florian Fainelli
2022-03-26 4:54 ` Naresh Kamboju
2022-03-26 9:55 ` Greg Kroah-Hartman
2022-03-26 12:26 ` Naresh Kamboju
2022-03-26 12:19 ` Bagas Sanjaya
2022-03-27 0:13 ` Ron Economos
2022-03-27 0:52 ` Guenter Roeck
2022-03-27 1:37 ` Justin Forbes
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=20220325150421.134448886@linuxfoundation.org \
--to=gregkh@linuxfoundation.org \
--cc=jack@suse.cz \
--cc=linux-kernel@vger.kernel.org \
--cc=riteshh@linux.ibm.com \
--cc=stable@kernel.org \
--cc=stable@vger.kernel.org \
--cc=syzbot+afa2ca5171d93e44b348@syzkaller.appspotmail.com \
--cc=tytso@mit.edu \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).