Re: [PATCH] module: set ksymtab/kcrctab* section addresses to 0x0

[Rabin Vincent <rabin@rab.in>]

On Tue, Jan 27, 2015 at 10:20:32AM +1030, Rusty Russell wrote:
> Rabin Vincent <rabin.vincent@axis.com> writes:
> > These __ksymtab*/__kcrctab* sections currently have non-zero addresses.
> > Non-zero section addresses in a relocatable ELF confuse GDB and it ends
> > up not relocating all symbols when add-symbol-file is used on modules
> > which have exports.  The kernel's module loader does not care about
> > these addresses, so let's just set them to zero.
> 
>         You're right, we don't use sh_addr.  This should be safe, I've
> applied it for the next merge window.

Thanks.

> AFAICT this would have always been a problem; wonder if it should be
> CC:stable?  I don't use gdb on modules so haven't got a good feel for
> how many people this would be hurting.

I've no opinion on -stable.  This method of debugging kernel modules is
described in for example LDD3, so it would be nice if it worked in all
cases, but I guess most people won't be affected even if they use it
since it only affects modules with exported symbols.