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SubjectRe: [PATCH bootconfig 2/3] fs/proc: Add boot loader arguments as comment to /proc/bootconfig
On Thu,  5 Oct 2023 10:17:46 -0700
"Paul E. McKenney" <paulmck@kernel.org> wrote:

> In kernels built with CONFIG_BOOT_CONFIG_FORCE=y, /proc/cmdline will
> show all kernel boot parameters, both those supplied by the boot loader
> and those embedded in the kernel image. This works well for those who
> just want to see all of the kernel boot parameters, but is not helpful to
> those who need to see only those parameters supplied by the boot loader.
> This is especially important when these parameters are presented to the
> boot loader by automation that might gather them from diverse sources.
> It is also useful when booting the next kernel via kexec(), in which
> case it is necessary to supply only those kernel command-line arguments
> from the boot loader, and most definitely not those that were embedded
> into the current kernel.
>
> Therefore, add comments to /proc/bootconfig of the form:
>
> # Parameters from bootloader:
> # root=UUID=ac0f0548-a69d-43ca-a06b-7db01bcbd5ad ro quiet ...
>
> The second added line shows only those kernel boot parameters supplied
> by the boot loader.

Thanks for update it.

This looks good to me.

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Thank you!

>
> Link: https://lore.kernel.org/all/CAHk-=wjpVAW3iRq_bfKnVfs0ZtASh_aT67bQBG11b4W6niYVUw@mail.gmail.com/
> Link: https://lore.kernel.org/all/20230731233130.424913-1-paulmck@kernel.org/
> Co-developed-by: Masami Hiramatsu <mhiramat@kernel.org>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Stephen Rothwell <sfr@canb.auug.org.au>
> Cc: Arnd Bergmann <arnd@kernel.org>
> Cc: Nick Desaulniers <ndesaulniers@google.com>
> Cc: Alexey Dobriyan <adobriyan@gmail.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: <linux-trace-kernel@vger.kernel.org>
> Cc: <linux-fsdevel@vger.kernel.org>
> ---
> fs/proc/bootconfig.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/fs/proc/bootconfig.c b/fs/proc/bootconfig.c
> index 2e244ada1f97..902b326e1e56 100644
> --- a/fs/proc/bootconfig.c
> +++ b/fs/proc/bootconfig.c
> @@ -62,6 +62,12 @@ static int __init copy_xbc_key_value_list(char *dst, size_t size)
> break;
> dst += ret;
> }
> + if (ret >= 0 && boot_command_line[0]) {
> + ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n",
> + boot_command_line);
> + if (ret > 0)
> + dst += ret;
> + }
> }
> out:
> kfree(key);
> --
> 2.40.1
>


--
Masami Hiramatsu (Google) <mhiramat@kernel.org>

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