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 e46aa00b3c997aeabaf0fc5d17a63ccea43e4632..aab33b204f886f592f5fe4182208eae1f6d73773 100644 (file)
--- a/init/main.c
+++ b/init/main.c
@@ -533,6 +533,12 @@ 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))
@@ -540,6 +546,12 @@ 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;