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154 lines
3.7 KiB
154 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/unistd.h> |
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#include <linux/kernel.h> |
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#include <linux/fs.h> |
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#include <linux/minix_fs.h> |
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#include <linux/romfs_fs.h> |
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#include <linux/initrd.h> |
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#include <linux/sched.h> |
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#include <linux/freezer.h> |
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#include <linux/kmod.h> |
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#include <uapi/linux/mount.h> |
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#include "do_mounts.h" |
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unsigned long initrd_start, initrd_end; |
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int initrd_below_start_ok; |
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static unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ |
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static int __initdata mount_initrd = 1; |
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phys_addr_t phys_initrd_start __initdata; |
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unsigned long phys_initrd_size __initdata; |
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#ifdef CONFIG_SYSCTL |
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static struct ctl_table kern_do_mounts_initrd_table[] = { |
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{ |
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.procname = "real-root-dev", |
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.data = &real_root_dev, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ } |
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}; |
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static __init int kernel_do_mounts_initrd_sysctls_init(void) |
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{ |
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register_sysctl_init("kernel", kern_do_mounts_initrd_table); |
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return 0; |
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} |
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late_initcall(kernel_do_mounts_initrd_sysctls_init); |
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#endif /* CONFIG_SYSCTL */ |
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static int __init no_initrd(char *str) |
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{ |
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mount_initrd = 0; |
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return 1; |
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} |
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__setup("noinitrd", no_initrd); |
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static int __init early_initrdmem(char *p) |
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{ |
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phys_addr_t start; |
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unsigned long size; |
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char *endp; |
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start = memparse(p, &endp); |
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if (*endp == ',') { |
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size = memparse(endp + 1, NULL); |
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phys_initrd_start = start; |
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phys_initrd_size = size; |
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} |
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return 0; |
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} |
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early_param("initrdmem", early_initrdmem); |
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static int __init early_initrd(char *p) |
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{ |
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return early_initrdmem(p); |
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} |
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early_param("initrd", early_initrd); |
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static int __init init_linuxrc(struct subprocess_info *info, struct cred *new) |
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{ |
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ksys_unshare(CLONE_FS | CLONE_FILES); |
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console_on_rootfs(); |
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/* move initrd over / and chdir/chroot in initrd root */ |
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init_chdir("/root"); |
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init_mount(".", "/", NULL, MS_MOVE, NULL); |
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init_chroot("."); |
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ksys_setsid(); |
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return 0; |
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} |
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static void __init handle_initrd(void) |
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{ |
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struct subprocess_info *info; |
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static char *argv[] = { "linuxrc", NULL, }; |
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extern char *envp_init[]; |
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int error; |
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pr_warn("using deprecated initrd support, will be removed in 2021.\n"); |
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real_root_dev = new_encode_dev(ROOT_DEV); |
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create_dev("/dev/root.old", Root_RAM0); |
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/* mount initrd on rootfs' /root */ |
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mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); |
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init_mkdir("/old", 0700); |
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init_chdir("/old"); |
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info = call_usermodehelper_setup("/linuxrc", argv, envp_init, |
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GFP_KERNEL, init_linuxrc, NULL, NULL); |
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if (!info) |
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return; |
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call_usermodehelper_exec(info, UMH_WAIT_PROC|UMH_FREEZABLE); |
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/* move initrd to rootfs' /old */ |
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init_mount("..", ".", NULL, MS_MOVE, NULL); |
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/* switch root and cwd back to / of rootfs */ |
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init_chroot(".."); |
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if (new_decode_dev(real_root_dev) == Root_RAM0) { |
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init_chdir("/old"); |
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return; |
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} |
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init_chdir("/"); |
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ROOT_DEV = new_decode_dev(real_root_dev); |
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mount_root(); |
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printk(KERN_NOTICE "Trying to move old root to /initrd ... "); |
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error = init_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); |
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if (!error) |
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printk("okay\n"); |
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else { |
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if (error == -ENOENT) |
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printk("/initrd does not exist. Ignored.\n"); |
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else |
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printk("failed\n"); |
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printk(KERN_NOTICE "Unmounting old root\n"); |
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init_umount("/old", MNT_DETACH); |
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} |
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} |
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bool __init initrd_load(void) |
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{ |
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if (mount_initrd) { |
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create_dev("/dev/ram", Root_RAM0); |
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/* |
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* Load the initrd data into /dev/ram0. Execute it as initrd |
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* unless /dev/ram0 is supposed to be our actual root device, |
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* in that case the ram disk is just set up here, and gets |
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* mounted in the normal path. |
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*/ |
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if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { |
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init_unlink("/initrd.image"); |
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handle_initrd(); |
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return true; |
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} |
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} |
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init_unlink("/initrd.image"); |
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return false; |
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}
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