Re: [PATCH 3/3] objtool: check: Handle calling non-function symbols in other sections

[Julien Thierry]

On 9/18/20 9:07 PM, Josh Poimboeuf wrote:
> On Tue, Sep 15, 2020 at 08:53:18AM +0100, Julien Thierry wrote:
> > Relocation for a call destination could point to a symbol that has
> > type STT_NOTYPE.
>
> Then shouldn't the callee be changed to STT_FUNC?

Not if it's a code symbol that does not follow standard calling convention.

It's really the same case as the !reloc, except this time it's in a 
different .text section. In arm64 there are different sections that are 
used (.text for basic code, .idmap.text for code mapped in a manner 
where virtual address == physical address, .hyp.text for kvm priviledged 
code, .tramp.text for trampolines...). There aren't many cases, but some 
symbols reference symbols in other sections, but the symbol being called 
isn't a proper function.



--
Julien Thierry