Re: [PATCH] Mini-OS: x86: zero out .bss segment at boot

[Jürgen Groß <jgross@xxxxxxxx>]

On 07.02.24 12:34, Samuel Thibault wrote:
> Jürgen Groß, le mer. 07 févr. 2024 12:16:44 +0100, a ecrit:
> > On 07.02.24 12:00, Samuel Thibault wrote:
> > > Jürgen Groß, le mer. 07 févr. 2024 11:42:20 +0100, a ecrit:
> > > > while implementing kexec in Mini-OS.
> > > Oh, nice :D
> > >
> > > > For that I need it for sure.
> > > It needs to be done by kexec itself then.
> > That's another option, yes.
> >
> > The question is whether we want to support to be kexec-ed from other
> > systems, too.
> But aren't other systems' kexec supports supposed to do the memset?
>
> They really should.
I guess there is a reason why the Linux kernel does clear its .bss section
in early boot. Maybe it is due to how the boot process works (the ELF file
is encapsulated in vmlinuz), but following your reasoning they should have
cleared their .bss while unpacking the ELF contents, not while booting the
contents.

I'm not sure they do the .bss clearing in kexec either, as the kernel is
clearing it anyway.


Juergen