linux-kernel - Re: [PATCH v3 3/4] module: centralize no-versions force load check

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Message-ID: <5ac979fd-7a84-4633-a53a-55be955faed4@suse.com>
Date: Mon, 1 Sep 2025 11:30:11 +0200
From: Petr Pavlu <petr.pavlu@...e.com>
To: Jinchao Wang <wangjinchao600@...il.com>
Cc: Luis Chamberlain <mcgrof@...nel.org>, Daniel Gomez <da.gomez@...nel.org>,
 Sami Tolvanen <samitolvanen@...gle.com>, linux-modules@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/4] module: centralize no-versions force load check

On 8/29/25 10:49 AM, Jinchao Wang wrote:
> Move try_to_force_load() call from check_version() to
> check_modstruct_version() to handle "no versions" case only once before
> other version checks.
> 
> Suggested-by: Petr Pavlu <petr.pavlu@...e.com>
> Signed-off-by: Jinchao Wang <wangjinchao600@...il.com>
> ---
>  kernel/module/version.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/module/version.c b/kernel/module/version.c
> index 2beefeba82d9..7a458c681049 100644
> --- a/kernel/module/version.c
> +++ b/kernel/module/version.c
> @@ -41,9 +41,9 @@ int check_version(const struct load_info *info,
>  		return 1;
>  	}
>  
> -	/* No versions at all?  modprobe --force does this. */
> +	/* No versions? Ok, already tainted in check_modstruct_version(). */
>  	if (versindex == 0)
> -		return try_to_force_load(mod, symname) == 0;
> +		return 1;
>  
>  	versions = (void *)sechdrs[versindex].sh_addr;
>  	num_versions = sechdrs[versindex].sh_size
> @@ -80,6 +80,7 @@ int check_modstruct_version(const struct load_info *info,
>  		.gplok	= true,
>  	};
>  	bool have_symbol;
> +	char *reason;
>  
>  	/*
>  	 * Since this should be found in kernel (which can't be removed), no
> @@ -90,6 +91,11 @@ int check_modstruct_version(const struct load_info *info,
>  		have_symbol = find_symbol(&fsa);
>  	BUG_ON(!have_symbol);
>  
> +	/* No versions at all?  modprobe --force does this. */
> +	if (!info->index.vers && !info->index.vers_ext_crc) {
> +		reason = "no versions for imported symbols";
> +		return try_to_force_load(mod, reason) == 0;
> +	}
>  	return check_version(info, "module_layout", mod, fsa.crc);
>  }
>  

Nit: I would prefer this to be formatted as:

+	/* No versions at all?  modprobe --force does this. */
+	if (!info->index.vers && !info->index.vers_ext_crc)
+		return try_to_force_load(
+			       mod, "no versions for imported symbols") == 0;
+

Nonetheless, it looks ok to me functionality-wise.

Reviewed-by: Petr Pavlu <petr.pavlu@...e.com>

-- 
Thanks,
Petr