init: handle bootloader identifier in kernel parameters

commit e416f0ed3c500c05c55fb62ee62662717b1c7f71 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>

diff --git a/init/main.c b/init/main.c
index c4778edae7972f512d5eefe8400075ac35a70d1c..821df1f05e9c025baa733e15dce93b13b2c8459c 100644 (file)
--- a/init/main.c
+++ b/init/main.c
@@ -543,6 +543,12 @@ static int __init unknown_bootoption(char *param, char *val,
                                     const char *unused, void *arg)
 {
        size_t len = strlen(param);
+       /*
+        * Well-known bootloader identifiers:
+        * 1. LILO/Grub pass "BOOT_IMAGE=...";
+        * 2. kexec/kdump (kexec-tools) pass "kexec".
+        */
+       const char *bootloader[] = { "BOOT_IMAGE=", "kexec", NULL };
 
        /* Handle params aliased to sysctls */
        if (sysctl_is_alias(param))
@@ -550,6 +556,12 @@ static int __init unknown_bootoption(char *param, char *val,
 
        repair_env_string(param, val);
 
+       /* Handle bootloader identifier */
+       for (int i = 0; bootloader[i]; i++) {
+               if (strstarts(param, bootloader[i]))
+                       return 0;
+       }
+
        /* Handle obsolete-style parameters */
        if (obsolete_checksetup(param))
                return 0;