linux-kernel - Re: [PATCH v2] printk: Do not lose last line in kmsg buffer dump

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]

Message-ID: <20190712092253.GA7922@jagdpanzerIV>
Date:   Fri, 12 Jul 2019 18:22:53 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        sergey.senozhatsky@...il.com, rostedt@...dmis.org,
        Vincent Whitchurch <rabinv@...s.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] printk: Do not lose last line in kmsg buffer dump

On (07/12/19 11:12), Petr Mladek wrote:
> > For example, with the following two final prints:
> > 
> > [    6.427502] AAAAAAAAAAAAA
> > [    6.427769] BBBBBBBB12345
> > 
> > A dump of a 64-byte buffer filled by kmsg_dump_get_buffer(), before this
> > patch:
> > 
> >  00000000: 3c 30 3e 5b 20 20 20 20 36 2e 35 32 32 31 39 37  <0>[    6.522197
> >  00000010: 5d 20 41 41 41 41 41 41 41 41 41 41 41 41 41 0a  ] AAAAAAAAAAAAA.
> >  00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> >  00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> > 
> > After this patch:
> > 
> >  00000000: 3c 30 3e 5b 20 20 20 20 36 2e 34 35 36 36 37 38  <0>[    6.456678
> >  00000010: 5d 20 42 42 42 42 42 42 42 42 31 32 33 34 35 0a  ] BBBBBBBB12345.
> >  00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> >  00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> > 
> > Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> 
> I think that I need vacation. I have got lost in all the checks
> and got it wrongly in the morning.
> 
> This patch fixes the calculation of messages that might fit
> into the buffer. It makes sure that the function that writes
> the messages will really allow to write them.
> 
> It seems to be the correct fix.
> 
> Reviewed-by: Petr Mladek <pmladek@...e.com>

Looks correct to me as well.

Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

	-ss