linux-kernel - [GIT PULL] fscrypt fix for v5.6-rc6

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Date:   Wed, 11 Mar 2020 12:48:39 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [GIT PULL] fscrypt fix for v5.6-rc6

The following changes since commit 98d54f81e36ba3bf92172791eba5ca5bd813989b:

  Linux 5.6-rc4 (2020-03-01 16:38:46 -0600)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/fs/fscrypt/fscrypt.git tags/fscrypt-for-linus

for you to fetch changes up to 2b4eae95c7361e0a147b838715c8baa1380a428f:

  fscrypt: don't evict dirty inodes after removing key (2020-03-07 18:43:07 -0800)

----------------------------------------------------------------

Fix a bug where if userspace is writing to encrypted files while the
FS_IOC_REMOVE_ENCRYPTION_KEY ioctl (introduced in v5.4) is running,
dirty inodes could be evicted, causing writes could be lost or the
filesystem to hang due to a use-after-free.  This was encountered during
real-world use, not just theoretical.

Tested with the existing fscrypt xfstests, and with a new xfstest I
wrote to reproduce this bug.  This fix does expose an existing bug with
'-o lazytime' that Ted is working on fixing, but this fscrypt fix is
more critical and is needed anyway regardless of the lazytime fix.

----------------------------------------------------------------
Eric Biggers (1):
      fscrypt: don't evict dirty inodes after removing key

 fs/crypto/keysetup.c | 9 +++++++++
 1 file changed, 9 insertions(+)