linux-kernel - Re: [PATCH 09/10] modpost: add symbol import protection flag to kflagstab

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Message-ID: <6e057525-ca8d-4f96-bb52-cca6cafbe835@suse.com>
Date: Wed, 8 Oct 2025 15:35:30 +0200
From: Petr Pavlu <petr.pavlu@...e.com>
To: Siddharth Nayyar <sidnayyar@...gle.com>
Cc: Nathan Chancellor <nathan@...nel.org>,
 Luis Chamberlain <mcgrof@...nel.org>, Sami Tolvanen
 <samitolvanen@...gle.com>, Nicolas Schier <nicolas.schier@...ux.dev>,
 Arnd Bergmann <arnd@...db.de>, linux-kbuild@...r.kernel.org,
 linux-arch@...r.kernel.org, linux-modules@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] modpost: add symbol import protection flag to
 kflagstab

On 8/29/25 12:54 PM, Siddharth Nayyar wrote:
> When the unused exports whitelist is provided, the symbol protection bit
> is set for symbols not present in the unused exports whitelist.
> 
> The flag will be used in the following commit to prevent unsigned
> modules from the using symbols other than those explicitly declared by
> the such modules ahead of time.
> 
> Signed-off-by: Siddharth Nayyar <sidnayyar@...gle.com>
> ---
> [...]
> diff --git a/include/linux/module_symbol.h b/include/linux/module_symbol.h
> index 574609aced99..96fe3f4d7424 100644
> --- a/include/linux/module_symbol.h
> +++ b/include/linux/module_symbol.h
> @@ -3,8 +3,9 @@
>  #define _LINUX_MODULE_SYMBOL_H
>  
>  /* Kernel symbol flags bitset. */
> -enum ksym_flags {
> +enum symbol_flags {
>  	KSYM_FLAG_GPL_ONLY	= 1 << 0,
> +	KSYM_FLAG_PROTECTED	= 1 << 1,
>  };
>  

Nit: The ksym_flags enum is added in patch #1. If you prefer a different
name, you can change it in that patch.

-- 
Thanks,
Petr