linux-ext4 - Re: [PATCH] ext4: Reduce ext4 timestamp warnings

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:   Wed, 4 Sep 2019 12:39:22 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     arnd@...db.de, linux-kernel@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, cai@....pw, jlayton@...nel.org,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH] ext4: Reduce ext4 timestamp warnings

On Sep 4, 2019, at 09:02, Deepa Dinamani <deepa.kernel@...il.com> wrote:
> 
> When ext4 file systems were created intentionally with 128 byte inodes,
> the rate-limited warning of eventual possible timestamp overflow are
> still emitted rather frequently.  Remove the warning for now.
> 
> Discussion for whether any warning is needed,
> and where it should be emitted, can be found at
> https://lore.kernel.org/lkml/1567523922.5576.57.camel@lca.pw/.
> I can post a separate follow-up patch after the conclusion.
> 
> Reported-by: Qian Cai <cai@....pw>
> Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>

I'd be in favor of a severely rare-limited warning in the actual case
that Y2038 timestamps cannot be stored, but the current message is
too verbose for now and I agree it is better to remove it while discussions
on the best solution are underway. 

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> fs/ext4/ext4.h | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 9e3ae3be3de9..24b14bd3feab 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -833,10 +833,8 @@ do {                                        \
>        (raw_inode)->xtime ## _extra =                    \
>                ext4_encode_extra_time(&(inode)->xtime);    \
>        }                                \
> -    else    {\
> +    else    \
>        (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
> -        ext4_warning_inode(inode, "inode does not support timestamps beyond 2038"); \
> -    } \
> } while (0)
> 
> #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                   \
> -- 
> 2.17.1
>