linux-kernel - Re: [PATCH] modpost: Fix modpost's license checking V3

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Date:	Wed, 20 Jul 2011 17:25:18 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Alessio Igor Bogani <abogani@...nel.org>,
	Jan Beulich <jbeulich@...ell.com>,
	Kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tim Bird <tim.bird@...sony.com>,
	Anders Kaseorg <andersk@...lice.com>,
	Arnaud Lacombe <lacombar@...il.com>
Subject: Re: [PATCH] modpost: Fix modpost's license checking V3

On 14.7.2011 08:51, Alessio Igor Bogani wrote:
> The commit f02e8a6 sorts symbols placing each of them in its own elf section.
> The sorting and merging into the canonical sections are done by the linker.
> Unfortunately modpost to generate Module.symvers file parses vmlinux
> (already linked) and all modules object files (which aren't linked yet).
> These aren't sanitized by the linker yet. That breaks modpost that can't
> detect license properly for modules. This patch makes modpost aware of
> the new exported symbols structure.
>
> Thanks to Arnaud Lacombe<lacombar@...il.com>  and Anders Kaseorg
> <andersk@...lice.com>  for providing useful suggestions about code.
>
> This work was supported by a hardware donation from the CE Linux Forum.
>
> Reported-by: Jan Beulich<jbeulich@...ell.com>
> Signed-off-by: Alessio Igor Bogani<abogani@...nel.org>
> ---
>   scripts/mod/modpost.c |   29 ++++++++++++++++++++++++++++-
>   1 files changed, 28 insertions(+), 1 deletions(-)

Rusty, will you take this patch or should I apply it to kbuild-2.6.git?

Michal


> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 413c536..a509ff8 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -254,6 +254,28 @@ static enum export export_no(const char *s)
>   	return export_unknown;
>   }
>
> +static const char *sec_name(struct elf_info *elf, int secindex);
> +
> +#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
> +
> +static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
> +{
> +	const char *secname = sec_name(elf, sec);
> +
> +	if (strstarts(secname, "___ksymtab+"))
> +		return export_plain;
> +	else if (strstarts(secname, "___ksymtab_unused+"))
> +		return export_unused;
> +	else if (strstarts(secname, "___ksymtab_gpl+"))
> +		return export_gpl;
> +	else if (strstarts(secname, "___ksymtab_unused_gpl+"))
> +		return export_unused_gpl;
> +	else if (strstarts(secname, "___ksymtab_gpl_future+"))
> +		return export_gpl_future;
> +	else
> +		return export_unknown;
> +}
> +
>   static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
>   {
>   	if (sec == elf->export_sec)
> @@ -563,7 +585,12 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
>   			       Elf_Sym *sym, const char *symname)
>   {
>   	unsigned int crc;
> -	enum export export = export_from_sec(info, get_secindex(info, sym));
> +	enum export export;
> +
> +	if (!is_vmlinux(mod->name)&&  strncmp(symname, "__ksymtab", 9) == 0)
> +		export = export_from_secname(info, get_secindex(info, sym));
> +	else
> +		export = export_from_sec(info, get_secindex(info, sym));
>
>   	switch (sym->st_shndx) {
>   	case SHN_COMMON:

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