lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 3 Feb 2023 08:19:35 -1000
From:   Tejun Heo <>
To:     Eric Biggers <>
        Matthew Wilcox <>,
Subject: Re: [PATCH] ext4: fix cgroup writeback accounting with fs-layer

On Thu, Feb 02, 2023 at 04:55:03PM -0800, Eric Biggers wrote:
> From: Eric Biggers <>
> When writing a page from an encrypted file that is using
> filesystem-layer encryption (not inline encryption), ext4 encrypts the
> pagecache page into a bounce page, then writes the bounce page.
> It also passes the bounce page to wbc_account_cgroup_owner().  That's
> incorrect, because the bounce page is a newly allocated temporary page
> that doesn't have the memory cgroup of the original pagecache page.
> This makes wbc_account_cgroup_owner() not account the I/O to the owner
> of the pagecache page as it should.
> Fix this by always passing the pagecache page to
> wbc_account_cgroup_owner().
> Fixes: 001e4a8775f6 ("ext4: implement cgroup writeback support")
> Cc:
> Reported-by: Matthew Wilcox (Oracle) <>
> Signed-off-by: Eric Biggers <>

Acked-by: Tejun Heo <>



Powered by blists - more mailing lists