.note.tag, readelf and dsynth version detection
Matthew Dillon
dillon at backplane.com
Mon Jan 27 17:05:18 PST 2020
Hmm. that's a good point. It does look like a repeated structure. I will
look into it.
-Matt
On Mon, Jan 27, 2020 at 4:15 PM Romick <yellowrabbit2010 at gmail.com> wrote:
> I was probably lucky :) Of course, I could be wrong, but it seems to me
> that these pieces are not "fields" of the same structure, these are fields
> that belong to two records in the file. Is the order of these records
> guaranteed?
>
> I mean, it’s possible if I rebuild the world now, the linker will arrange
> these records in a different order and everything will be fine, or maybe
> not :)
>
> On Mon, Jan 27, 2020 at 03:56:25PM -0800, Matthew Dillon wrote:
> > That's ... weird. the 'zero' and the 'version' fields are transposed.
> Are you
> > compiling in any special way? I've tested -release and -master on a
> bunch of
> > boxes and they all have the version in the right spot.
> >
> > -Matt
> >
> > On Mon, Jan 27, 2020 at 1:45 PM Romick <yellowrabbit2010 at gmail.com>
> wrote:
> >
> > Hello,
> > It seems that dsynth defines the system version based on the
> .note.tag(s)
> > in
> > /bin/sh and a necessary condition is that these entries follow in a
> > certain order. On my system this is not so :)
> >
> > ==========
> > rabbit at fly ~% readelf -x .note.tag /bin/sh
> >
> > Hex dump of section '.note.tag':
> > 0x00400218 0a000000 04000000 20000000 44726167 ........ ...Drag
> > 0x00400228 6f6e466c 79000000 00000000 0a000000 onFly...........
> > 0x00400238 04000000 01000000 44726167 6f6e466c ........DragonFl
> > 0x00400248 79000000 e5a30700 y.......
> >
> > rabbit at fly ~%
> > ==========
> >
> > === /usr/src/usr.bin/dsynth/config.c ===
> > struct NoteTag {
> > Elf_Note note;
> > char osname1[12];
> > int version; /* e.g. 500702 -> 5.7 */
> > int x1;
> > int x2;
> > int x3;
> > char osname2[12];
> > int zero;
> > };
> > ========================================
> >
> > --
> > with best regards,
> > Yellow Rabbit @yrabbit at mastodon.sdf.org
> > DragonFly 5.7-DEVELOPMENT x86_64
> >
>
> --
> with best regards,
> Yellow Rabbit @yrabbit at mastodon.sdf.org
> DragonFly 5.7-DEVELOPMENT x86_64
>
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