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SubjectRe: [PATCH] Make initramfs honor CONFIG_DEVTMPFS_MOUNT
On Thu, May 4, 2017 at 2:09 PM, Rob Landley <rob@landley.net> wrote:
> From: Rob Landley <rob@landley.net>
>
> Make initramfs honor CONFIG_DEVTMPFS_MOUNT, and move
> /dev/console open after devtmpfs mount.
>
> Signed-off-by: Rob Landley <rob@landley.net>

Seems sensible.

Reviewed-by: Kees Cook <keescook@chromium.org>


-Kees

> ---
>
> init/main.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/init/main.c b/init/main.c
> index 2858be7..71ed0d7 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -1016,12 +1016,6 @@ static noinline void __init kernel_init_freeable(void)
>
> do_basic_setup();
>
> - /* Open the /dev/console on the rootfs, this should never fail */
> - if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
> - pr_err("Warning: unable to open an initial console.\n");
> -
> - (void) sys_dup(0);
> - (void) sys_dup(0);
> /*
> * check if there is an early userspace init. If yes, let it do all
> * the work
> @@ -1033,8 +1027,17 @@ static noinline void __init kernel_init_freeable(void)
> if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
> ramdisk_execute_command = NULL;
> prepare_namespace();
> + } else if (IS_ENABLED(CONFIG_DEVTMPFS_MOUNT)) {
> + sys_mkdir("/dev", 0755);
> + sys_mount("dev", "dev", "devtmpfs", MS_SILENT, NULL);
> }
>
> + /* Open the /dev/console on the rootfs, this should never fail */
> + if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
> + pr_err("Warning: unable to open an initial console.\n");
> + (void) sys_dup(0);
> + (void) sys_dup(0);
> +
> /*
> * Ok, we have completed the initial bootup, and
> * we're essentially up and running. Get rid of the



--
Kees Cook
Pixel Security

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