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

[Vasily Gorbik]

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@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
> 
> This looks great! Much cleaner than the original approach.
> 
> Thank you,
> Petr T

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