linux-ext4 - Re: [PATCH v3 3/3] ext4: do not update s_last

lists.openwall.net		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:   Sat, 5 May 2018 09:41:02 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Theodore Tso <tytso@....edu>
Cc:     Jan Kara <jack@...e.cz>, Ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] ext4: do not update s_last_mounted of a frozen fs

On Mon, Apr 23, 2018 at 6:00 PM, Amir Goldstein <amir73il@...il.com> wrote:
> If fs is frozen after mount and before the first file open, the
> update of s_last_mounted bypasses freeze protection and prints out
> a WARNING splat:
>
> $ mount /vdf
> $ fsfreeze -f /vdf
> $ cat /vdf/foo
>
> [   31.578555] WARNING: CPU: 1 PID: 1415 at
> fs/ext4/ext4_jbd2.c:53 ext4_journal_check_start+0x48/0x82
>
> [   31.614016] Call Trace:
> [   31.614997]  __ext4_journal_start_sb+0xe4/0x1a4
> [   31.616771]  ? ext4_file_open+0xb6/0x189
> [   31.618094]  ext4_file_open+0xb6/0x189
>
> If fs is frozen, skip s_last_mounted update.
>
> [backport hint: to apply to stable tree, need to apply also patches
>  vfs: add the sb_start_intwrite_trylock() helper
>  ext4: factor out helper ext4_sample_last_mounted()]
>
> Fixes: bc0b0d6d69ee ("ext4: update the s_last_mounted field in the
> superblock")
> Cc: <stable@...r.kernel.org>
> Reviewed-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Amir Goldstein <amir73il@...il.com>
> ---

Ted,

Ping.
Just wanted to make sure this didn't fly under your radar during LSF.
The series is already reviewed by Jan.

Thanks,
Amir.