linux-kernel - Re: [PATCH] s390: enable detection of kernel version from bzImage

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Date:   Tue, 16 Jul 2019 15:11:38 +0200
From:   Vasily Gorbik <gor@...ux.ibm.com>
To:     Petr Tesarik <PTesarik@...e.com>
Cc:     Heiko Carstens <heiko.carstens@...ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Philipp Rudo <prudo@...ux.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Laura Abbott <labbott@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Raymund Will <rw@...e.com>
Subject: Re: [PATCH] s390: enable detection of kernel version from bzImage

On Tue, Jul 16, 2019 at 10:30:14AM +0000, Petr Tesarik wrote:
> On Tue, 16 Jul 2019 00:12:19 +0200
> Vasily Gorbik <gor@...ux.ibm.com> wrote:
> 
> > Extend "parmarea" to include an offset of the version string, which is
> > stored as 8-byte big endian value.
> > 
> > To retrieve version string from bzImage reliably, one should check the
> > presence of "S390EP" ascii string at 0x10008 (available since v3.2),
> > then read the version string offset from 0x10428 (which has been 0
> > since v3.2 up to now). The string is null terminated.
> > 
> > Could be retrieved with the following "file" command magic (requires
> > file v5.34):
> > 8 string \x02\x00\x00\x18\x60\x00\x00\x50\x02\x00\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40\x40\x40\x40\x40 Linux S390
> > >0x10008       string          S390EP  
> > >>0x10428      bequad          >0  
> > >>>(0x10428.Q) string          >\0             \b, version %s  
> > 
> > Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
> 
> This looks great! Much cleaner than the original approach.
> 
> Thank you,
> Petr T

Then I'll add
Reported-by: Petr Tesarik <ptesarik@...e.com>
Suggested-by: Petr Tesarik <ptesarik@...e.com>
if you don't mind and try to queue that for 5.3.