diff options
Diffstat (limited to 'init/do_mounts_initrd.c')
| -rw-r--r-- | init/do_mounts_initrd.c | 135 |
1 files changed, 76 insertions, 59 deletions
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c index 3e0878e8a80d..f6867bad0d78 100644 --- a/init/do_mounts_initrd.c +++ b/init/do_mounts_initrd.c @@ -1,13 +1,4 @@ -/* - * Many of the syscalls used in this file expect some of the arguments - * to be __user pointers not __kernel pointers. To limit the sparse - * noise, turn off sparse checking for this file. - */ -#ifdef __CHECKER__ -#undef __CHECKER__ -#warning "Sparse checking disabled for this file" -#endif - +// SPDX-License-Identifier: GPL-2.0 #include <linux/unistd.h> #include <linux/kernel.h> #include <linux/fs.h> @@ -17,14 +8,37 @@ #include <linux/sched.h> #include <linux/freezer.h> #include <linux/kmod.h> +#include <uapi/linux/mount.h> #include "do_mounts.h" unsigned long initrd_start, initrd_end; int initrd_below_start_ok; -unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ +static unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ static int __initdata mount_initrd = 1; +phys_addr_t phys_initrd_start __initdata; +unsigned long phys_initrd_size __initdata; + +#ifdef CONFIG_SYSCTL +static const struct ctl_table kern_do_mounts_initrd_table[] = { + { + .procname = "real-root-dev", + .data = &real_root_dev, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, +}; + +static __init int kernel_do_mounts_initrd_sysctls_init(void) +{ + register_sysctl_init("kernel", kern_do_mounts_initrd_table); + return 0; +} +late_initcall(kernel_do_mounts_initrd_sysctls_init); +#endif /* CONFIG_SYSCTL */ + static int __init no_initrd(char *str) { mount_initrd = 0; @@ -33,90 +47,93 @@ static int __init no_initrd(char *str) __setup("noinitrd", no_initrd); -static int init_linuxrc(struct subprocess_info *info, struct cred *new) +static int __init early_initrdmem(char *p) { - sys_unshare(CLONE_FS | CLONE_FILES); - /* stdin/stdout/stderr for /linuxrc */ - sys_open("/dev/console", O_RDWR, 0); - sys_dup(0); - sys_dup(0); + phys_addr_t start; + unsigned long size; + char *endp; + + start = memparse(p, &endp); + if (*endp == ',') { + size = memparse(endp + 1, NULL); + + phys_initrd_start = start; + phys_initrd_size = size; + } + return 0; +} +early_param("initrdmem", early_initrdmem); + +static int __init early_initrd(char *p) +{ + return early_initrdmem(p); +} +early_param("initrd", early_initrd); + +static int __init init_linuxrc(struct subprocess_info *info, struct cred *new) +{ + ksys_unshare(CLONE_FS | CLONE_FILES); + console_on_rootfs(); /* move initrd over / and chdir/chroot in initrd root */ - sys_chdir("/root"); - sys_mount(".", "/", NULL, MS_MOVE, NULL); - sys_chroot("."); - sys_setsid(); + init_chdir("/root"); + init_mount(".", "/", NULL, MS_MOVE, NULL); + init_chroot("."); + ksys_setsid(); return 0; } -static void __init handle_initrd(void) +static void __init handle_initrd(char *root_device_name) { struct subprocess_info *info; static char *argv[] = { "linuxrc", NULL, }; extern char *envp_init[]; int error; + pr_warn("using deprecated initrd support, will be removed soon.\n"); + real_root_dev = new_encode_dev(ROOT_DEV); create_dev("/dev/root.old", Root_RAM0); /* mount initrd on rootfs' /root */ - mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); - sys_mkdir("/old", 0700); - sys_chdir("/old"); - - /* try loading default modules from initrd */ - load_default_modules(); - - /* - * In case that a resume from disk is carried out by linuxrc or one of - * its children, we need to tell the freezer not to wait for us. - */ - current->flags |= PF_FREEZER_SKIP; + mount_root_generic("/dev/root.old", root_device_name, + root_mountflags & ~MS_RDONLY); + init_mkdir("/old", 0700); + init_chdir("/old"); info = call_usermodehelper_setup("/linuxrc", argv, envp_init, GFP_KERNEL, init_linuxrc, NULL, NULL); if (!info) return; - call_usermodehelper_exec(info, UMH_WAIT_PROC); - - current->flags &= ~PF_FREEZER_SKIP; + call_usermodehelper_exec(info, UMH_WAIT_PROC|UMH_FREEZABLE); /* move initrd to rootfs' /old */ - sys_mount("..", ".", NULL, MS_MOVE, NULL); + init_mount("..", ".", NULL, MS_MOVE, NULL); /* switch root and cwd back to / of rootfs */ - sys_chroot(".."); + init_chroot(".."); if (new_decode_dev(real_root_dev) == Root_RAM0) { - sys_chdir("/old"); + init_chdir("/old"); return; } - sys_chdir("/"); + init_chdir("/"); ROOT_DEV = new_decode_dev(real_root_dev); - mount_root(); + mount_root(root_device_name); printk(KERN_NOTICE "Trying to move old root to /initrd ... "); - error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); + error = init_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); if (!error) printk("okay\n"); else { - int fd = sys_open("/dev/root.old", O_RDWR, 0); if (error == -ENOENT) printk("/initrd does not exist. Ignored.\n"); else printk("failed\n"); printk(KERN_NOTICE "Unmounting old root\n"); - sys_umount("/old", MNT_DETACH); - printk(KERN_NOTICE "Trying to free ramdisk memory ... "); - if (fd < 0) { - error = fd; - } else { - error = sys_ioctl(fd, BLKFLSBUF, 0); - sys_close(fd); - } - printk(!error ? "okay\n" : "failed\n"); + init_umount("/old", MNT_DETACH); } } -int __init initrd_load(void) +bool __init initrd_load(char *root_device_name) { if (mount_initrd) { create_dev("/dev/ram", Root_RAM0); @@ -127,11 +144,11 @@ int __init initrd_load(void) * mounted in the normal path. */ if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { - sys_unlink("/initrd.image"); - handle_initrd(); - return 1; + init_unlink("/initrd.image"); + handle_initrd(root_device_name); + return true; } } - sys_unlink("/initrd.image"); - return 0; + init_unlink("/initrd.image"); + return false; } |