Re: [RFC PATCH v2 5/7] ext4: use RCU to protect accessing superblock in... | linux-ext4

[RFC PATCH v2 0/7] ext4, jbd2: fix 3 issues about bdev_try_to_free_page() · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
[RFC PATCH v2 1/7] jbd2: remove the out label in __jbd2_journal_remove_checkpoint() · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
Re: [RFC PATCH v2 1/7] jbd2: remove the out label in __jbd2_journal_remove_checkpoint() · Jan Kara <jack@suse.cz> · 2021-04-21
[RFC PATCH v2 6/7] fs: introduce a usage count into the superblock · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
Re: [RFC PATCH v2 6/7] fs: introduce a usage count into the superblock · Christoph Hellwig <hch@infradead.org> · 2021-04-15
Re: [RFC PATCH v2 6/7] fs: introduce a usage count into the superblock · Zhang Yi <yi.zhang@huawei.com> · 2021-04-16
[RFC PATCH v2 4/7] jbd2: do not free buffers in jbd2_journal_try_to_free_buffers() · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
Re: [RFC PATCH v2 4/7] jbd2: do not free buffers in jbd2_journal_try_to_free_buffers() · Christoph Hellwig <hch@infradead.org> · 2021-04-15
[RFC PATCH v2 2/7] jbd2: ensure abort the journal if detect IO error when writing original buffer back · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
Re: [RFC PATCH v2 2/7] jbd2: ensure abort the journal if detect IO error when writing original buffer back · Jan Kara <jack@suse.cz> · 2021-04-21
[RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Christoph Hellwig <hch@infradead.org> · 2021-04-15
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Zhang Yi <yi.zhang@huawei.com> · 2021-04-16
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Christoph Hellwig <hch@infradead.org> · 2021-04-20
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Jan Kara <jack@suse.cz> · 2021-04-21
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · "Theodore Ts'o" <tytso@mit.edu> · 2021-04-21
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Jan Kara <jack@suse.cz> · 2021-04-22
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Zhang Yi <yi.zhang@huawei.com> · 2021-04-23
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · Jan Kara <jack@suse.cz> · 2021-04-23
Re: [RFC PATCH v2 7/7] ext4: fix race between blkdev_releasepage() and ext4_put_super() · "Theodore Ts'o" <tytso@mit.edu> · 2021-04-23
[RFC PATCH v2 5/7] ext4: use RCU to protect accessing superblock in blkdev_releasepage() · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
Re: [RFC PATCH v2 5/7] ext4: use RCU to protect accessing superblock in blkdev_releasepage() · Christoph Hellwig <hch@infradead.org> · 2021-04-15
[RFC PATCH v2 3/7] jbd2: don't abort the journal when freeing buffers · Zhang Yi <yi.zhang@huawei.com> · 2021-04-14
Re: [RFC PATCH v2 3/7] jbd2: don't abort the journal when freeing buffers · Jan Kara <jack@suse.cz> · 2021-04-21

Re: [RFC PATCH v2 5/7] ext4: use RCU to protect accessing superblock in blkdev_releasepage()

From: Christoph Hellwig <hch@infradead.org>
Date: 2021-04-15 14:49:24
Also in: linux-fsdevel

On Wed, Apr 14, 2021 at 09:47:35PM +0800, Zhang Yi wrote:

In blkdev_releasepage() we access the superblock structure directly, it
could be raced by umount filesystem on destroy superblock in put_super(),
and end up triggering a use after free issue.

The subject is wrong, this does not change ext4 code.

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