On Thu, Aug 16, 2007 at 09:30:56AM -0700, Arjan van de Ven wrote:
> this sounds like something really stupid and bad... why would the kernel
> need to have a per-distro note section???
On Thu, Aug 16, 2007 at 09:39:06AM -0700, Chris Wright wrote:
> Huh!? Why do we need a SuSE section?
On Thu, Aug 16, 2007 at 09:54:55AM -0700, Greg KH wrote:
> I agree, what did we mess up in the SuSE kernel to require such a hack?
Beats the crap out of me.
Drop this patch - it looks like it might just be papering over
symptoms rather than fixing the real problem - see below.
What I do know is that current UML doesn't run when built on a SuSE
host, the UML commit which caused it to break is
c35e584c087381aaa5f1ed40a28b978535c18fb2
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c35e584c087381aaa5f1ed40a28b978535c18fb2;hp=a5bd1786fb30abe663b904f6d79bba413e9ba883
and the difference between a working UML binary and a broken one is
this:
+ 1 .note.ABI-tag 00000020 0000000060000254 0000000060000254 00000254 2**2
+ CONTENTS, ALLOC, LOAD, READONLY, DATA
+ 2 .note.SuSE 00000018 0000000060000274 0000000060000274 00000274 2**2
+ CONTENTS, ALLOC, LOAD, READONLY, DATA
and the .note.SuSE section makes the difference.
Looking into it a bit further, the contents of the section are:
objdump --section=.note.SuSE -s uml8796-linux-good
uml8796-linux-good: file format elf64-x86-64
Contents of section .note.SuSE:
60000274 05000000 04000000 53755345 53755345 ........SuSESuSE
60000284 00000000 01000a02 ........
which seems kind of pointless, but also harmless.
The crash is in this section:
__uml_setup_start = .;
.uml.setup.init : { *(.uml.setup.init) }
__uml_setup_end = .;
with &__uml_setup_start being 8 bytes before the start of the first
16-byte structure in .uml.setup.init, so the structures are misaligned
wrt the start symbol.
I don't see any connection between the presence of a section at the
start of the binary and this misalignment, so the patch is probably wrong.
Jeff
--
Work email - jdike at linux dot intel dot com
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