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linux/init
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Huacai Chen 04718ab5db init: handle bootloader identifier in kernel parameters 
commit e416f0ed3c upstream.

BootLoaders (Grub, LILO, etc) may pass an identifier such as "BOOT_IMAGE=
/boot/vmlinuz-x.y.z" to kernel parameters.  But these identifiers are not
recognized by the kernel itself so will be passed to userspace.  However
user space init program also don't recognize it.

KEXEC/KDUMP (kexec-tools) may also pass an identifier such as "kexec" on
some architectures.

We cannot change BootLoader's behavior, because this behavior exists for
many years, and there are already user space programs search BOOT_IMAGE=
in /proc/cmdline to obtain the kernel image locations:

https://github.com/linuxdeepin/deepin-ab-recovery/blob/master/util.go
(search getBootOptions)
https://github.com/linuxdeepin/deepin-ab-recovery/blob/master/main.go
(search getKernelReleaseWithBootOption) So the the best way is handle
(ignore) it by the kernel itself, which can avoid such boot warnings (if
we use something like init=/bin/bash, bootloader identifier can even cause
a crash):

Kernel command line: BOOT_IMAGE=(hd0,1)/vmlinuz-6.x root=/dev/sda3 ro console=tty
Unknown kernel command line parameters "BOOT_IMAGE=(hd0,1)/vmlinuz-6.x", will be passed to user space.

[chenhuacai@loongson.cn: use strstarts()]
  Link: https://lkml.kernel.org/r/20250815090120.1569947-1-chenhuacai@loongson.cn
Link: https://lkml.kernel.org/r/20250721101343.3283480-1-chenhuacai@loongson.cn
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-10-19 16:23:13 +02:00
..
.gitignore kbuild: build init/built-in.a just once 2022-09-29 04:40:15 +09:00
build-version kbuild: build init/built-in.a just once 2022-09-29 04:40:15 +09:00
calibrate.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
do_mounts.c rootfs: Fix support for rootfstype= when root= is given 2024-01-25 15:27:43 -08:00
do_mounts.h init: add an init_mknod helper 2020-07-31 08:17:54 +02:00
do_mounts_initrd.c freezer,umh: Clean up freezer/initrd interaction 2022-09-07 21:53:48 +02:00
do_mounts_rd.c init: add an init_unlink helper 2020-07-31 08:17:52 +02:00
init_task.c rcu-tasks: Add data structures for lightweight grace periods 2022-06-20 09:22:28 -07:00
initramfs.c initramfs: avoid filename buffer overrun 2024-12-14 19:53:14 +01:00
Kconfig init: INITRAMFS_PRESERVE_MTIME should depend on BLK_DEV_INITRD 2025-10-15 11:56:25 +02:00
main.c init: handle bootloader identifier in kernel parameters 2025-10-19 16:23:13 +02:00
Makefile kbuild: generate include/generated/compile.h in top Makefile 2022-09-29 04:40:15 +09:00
noinitramfs.c init: move usermodehelper_enable() to populate_rootfs() 2021-09-08 11:50:27 -07:00
version-timestamp.c kbuild: build init/built-in.a just once 2022-09-29 04:40:15 +09:00
version.c kbuild: build init/built-in.a just once 2022-09-29 04:40:15 +09:00