linux-kernel - Re: [PATCH v2 52/62] objtool/klp: Introduce klp diff subcommand for diffing object files

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Message-ID: <2oublab5wrfzneispi4sqb6feiw2abc3mzxozmx53btuvseljh@3qsmyluomyir>
Date: Mon, 9 Jun 2025 16:21:11 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Joe Lawrence <joe.lawrence@...hat.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, 
	Petr Mladek <pmladek@...e.com>, Miroslav Benes <mbenes@...e.cz>, live-patching@...r.kernel.org, 
	Song Liu <song@...nel.org>, laokz <laokz@...mail.com>, Jiri Kosina <jikos@...nel.org>, 
	Marcos Paulo de Souza <mpdesouza@...e.com>, Weinan Liu <wnliu@...gle.com>, 
	Fazla Mehrab <a.mehrab@...edance.com>, Chen Zhongjin <chenzhongjin@...wei.com>, 
	Puranjay Mohan <puranjay@...nel.org>
Subject: Re: [PATCH v2 52/62] objtool/klp: Introduce klp diff subcommand for
 diffing object files

On Mon, Jun 09, 2025 at 02:32:19PM -0400, Joe Lawrence wrote:
> On Fri, May 09, 2025 at 01:17:16PM -0700, Josh Poimboeuf wrote:
> > +static int validate_ffunction_fdata_sections(struct elf *elf)
> > +{
> > +	struct symbol *sym;
> > +	bool found_text = false, found_data = false;
> > +
> > +	for_each_sym(elf, sym) {
> > +		char sec_name[SEC_NAME_LEN];
> > +
> > +		if (!found_text && is_func_sym(sym)) {
> > +			snprintf(sec_name, SEC_NAME_LEN, ".text.%s", sym->name);
> > +			if (!strcmp(sym->sec->name, sec_name))
> > +				found_text = true;
> > +		}
> > +
> > +		if (!found_data && is_object_sym(sym)) {
> > +			snprintf(sec_name, SEC_NAME_LEN, ".data.%s", sym->name);
> > +			if (!strcmp(sym->sec->name, sec_name))
> > +				found_data = true;
> 
> Hi Josh,
> 
> Should we check for other data section prefixes here, like:
> 
> 			else {
> 				snprintf(sec_name, SEC_NAME_LEN, ".rodata.%s", sym->name);
> 				if (!strcmp(sym->sec->name, sec_name))
> 					found_data = true;
> 			}

Indeed.  And also .bss.*.

> At the same time, while we're here, what about other .text.* section
> prefixes?

AFAIK, .text.* is the only one.

-- 
Josh