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b234ed6d62
Currently, usermodehelper is enabled right before PID1 starts going through the initcalls. However, any call of a usermodehelper from a pure_, core_, postcore_, arch_, subsys_ or fs_ initcall is futile, as there is no filesystem contents yet. Up until commite7cb072eb9
("init/initramfs.c: do unpacking asynchronously"), such calls, whether via some request_module(), a legacy uevent "/sbin/hotplug" notification or something else, would just fail silently with (presumably) -ENOENT from kernel_execve(). However, that commit introduced the wait_for_initramfs() synchronization hook which must be called from the usermodehelper exec path right before the kernel_execve, in order that request_module() et al done from *after* rootfs_initcall() time (i.e. device_ and late_ initcalls) would continue to find a populated initramfs as they used to. Any call of wait_for_initramfs() done before the unpacking has been scheduled (i.e. before rootfs_initcall time) must just return immediately [and let the caller find an empty file system] in order not to deadlock the machine. I mistakenly thought, and my limited testing confirmed, that there were no such calls, so I added a pr_warn_once() in wait_for_initramfs(). It turns out that one can indeed hit request_module() as well as kobject_uevent_env() during those early init calls, leading to a user-visible warning in the kernel log emitted consistently for certain configurations. We could just remove the pr_warn_once(), but I think it's better to postpone enabling the usermodehelper framework until there is at least some chance of finding the executable. That is also a little more efficient in that a lot of work done in umh.c will be elided. However, it does change the error seen by those early callers from -ENOENT to -EBUSY, so there is a risk of a regression if any caller care about the exact error value. Link: https://lkml.kernel.org/r/20210728134638.329060-1-linux@rasmusvillemoes.dk Fixes:e7cb072eb9
("init/initramfs.c: do unpacking asynchronously") Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Reported-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reported-by: Bruno Goncalves <bgoncalv@redhat.com> Reported-by: Heiner Kallweit <hkallweit1@gmail.com> Cc: Luis Chamberlain <mcgrof@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
737 lines
16 KiB
C
737 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/init.h>
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#include <linux/async.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/dirent.h>
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#include <linux/syscalls.h>
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#include <linux/utime.h>
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#include <linux/file.h>
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#include <linux/memblock.h>
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#include <linux/mm.h>
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#include <linux/namei.h>
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#include <linux/init_syscalls.h>
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#include <linux/umh.h>
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static ssize_t __init xwrite(struct file *file, const char *p, size_t count,
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loff_t *pos)
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{
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ssize_t out = 0;
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/* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
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while (count) {
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ssize_t rv = kernel_write(file, p, count, pos);
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if (rv < 0) {
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if (rv == -EINTR || rv == -EAGAIN)
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continue;
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return out ? out : rv;
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} else if (rv == 0)
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break;
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p += rv;
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out += rv;
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count -= rv;
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}
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return out;
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}
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static __initdata char *message;
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static void __init error(char *x)
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{
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if (!message)
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message = x;
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}
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static void panic_show_mem(const char *fmt, ...)
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{
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va_list args;
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show_mem(0, NULL);
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va_start(args, fmt);
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panic(fmt, args);
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va_end(args);
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}
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/* link hash */
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#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
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static __initdata struct hash {
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int ino, minor, major;
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umode_t mode;
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struct hash *next;
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char name[N_ALIGN(PATH_MAX)];
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} *head[32];
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static inline int hash(int major, int minor, int ino)
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{
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unsigned long tmp = ino + minor + (major << 3);
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tmp += tmp >> 5;
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return tmp & 31;
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}
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static char __init *find_link(int major, int minor, int ino,
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umode_t mode, char *name)
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{
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struct hash **p, *q;
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for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
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if ((*p)->ino != ino)
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continue;
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if ((*p)->minor != minor)
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continue;
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if ((*p)->major != major)
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continue;
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if (((*p)->mode ^ mode) & S_IFMT)
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continue;
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return (*p)->name;
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}
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q = kmalloc(sizeof(struct hash), GFP_KERNEL);
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if (!q)
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panic_show_mem("can't allocate link hash entry");
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q->major = major;
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q->minor = minor;
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q->ino = ino;
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q->mode = mode;
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strcpy(q->name, name);
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q->next = NULL;
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*p = q;
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return NULL;
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}
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static void __init free_hash(void)
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{
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struct hash **p, *q;
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for (p = head; p < head + 32; p++) {
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while (*p) {
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q = *p;
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*p = q->next;
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kfree(q);
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}
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}
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}
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static long __init do_utime(char *filename, time64_t mtime)
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{
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struct timespec64 t[2];
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t[0].tv_sec = mtime;
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t[0].tv_nsec = 0;
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t[1].tv_sec = mtime;
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t[1].tv_nsec = 0;
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return init_utimes(filename, t);
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}
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static __initdata LIST_HEAD(dir_list);
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struct dir_entry {
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struct list_head list;
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char *name;
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time64_t mtime;
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};
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static void __init dir_add(const char *name, time64_t mtime)
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{
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struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL);
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if (!de)
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panic_show_mem("can't allocate dir_entry buffer");
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INIT_LIST_HEAD(&de->list);
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de->name = kstrdup(name, GFP_KERNEL);
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de->mtime = mtime;
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list_add(&de->list, &dir_list);
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}
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static void __init dir_utime(void)
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{
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struct dir_entry *de, *tmp;
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list_for_each_entry_safe(de, tmp, &dir_list, list) {
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list_del(&de->list);
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do_utime(de->name, de->mtime);
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kfree(de->name);
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kfree(de);
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}
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}
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static __initdata time64_t mtime;
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/* cpio header parsing */
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static __initdata unsigned long ino, major, minor, nlink;
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static __initdata umode_t mode;
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static __initdata unsigned long body_len, name_len;
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static __initdata uid_t uid;
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static __initdata gid_t gid;
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static __initdata unsigned rdev;
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static void __init parse_header(char *s)
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{
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unsigned long parsed[12];
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char buf[9];
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int i;
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buf[8] = '\0';
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for (i = 0, s += 6; i < 12; i++, s += 8) {
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memcpy(buf, s, 8);
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parsed[i] = simple_strtoul(buf, NULL, 16);
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}
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ino = parsed[0];
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mode = parsed[1];
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uid = parsed[2];
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gid = parsed[3];
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nlink = parsed[4];
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mtime = parsed[5]; /* breaks in y2106 */
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body_len = parsed[6];
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major = parsed[7];
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minor = parsed[8];
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rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
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name_len = parsed[11];
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}
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/* FSM */
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static __initdata enum state {
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Start,
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Collect,
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GotHeader,
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SkipIt,
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GotName,
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CopyFile,
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GotSymlink,
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Reset
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} state, next_state;
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static __initdata char *victim;
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static unsigned long byte_count __initdata;
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static __initdata loff_t this_header, next_header;
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static inline void __init eat(unsigned n)
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{
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victim += n;
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this_header += n;
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byte_count -= n;
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}
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static __initdata char *collected;
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static long remains __initdata;
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static __initdata char *collect;
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static void __init read_into(char *buf, unsigned size, enum state next)
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{
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if (byte_count >= size) {
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collected = victim;
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eat(size);
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state = next;
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} else {
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collect = collected = buf;
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remains = size;
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next_state = next;
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state = Collect;
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}
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}
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static __initdata char *header_buf, *symlink_buf, *name_buf;
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static int __init do_start(void)
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{
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read_into(header_buf, 110, GotHeader);
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return 0;
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}
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static int __init do_collect(void)
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{
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unsigned long n = remains;
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if (byte_count < n)
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n = byte_count;
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memcpy(collect, victim, n);
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eat(n);
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collect += n;
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if ((remains -= n) != 0)
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return 1;
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state = next_state;
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return 0;
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}
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static int __init do_header(void)
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{
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if (memcmp(collected, "070707", 6)==0) {
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error("incorrect cpio method used: use -H newc option");
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return 1;
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}
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if (memcmp(collected, "070701", 6)) {
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error("no cpio magic");
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return 1;
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}
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parse_header(collected);
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next_header = this_header + N_ALIGN(name_len) + body_len;
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next_header = (next_header + 3) & ~3;
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state = SkipIt;
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if (name_len <= 0 || name_len > PATH_MAX)
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return 0;
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if (S_ISLNK(mode)) {
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if (body_len > PATH_MAX)
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return 0;
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collect = collected = symlink_buf;
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remains = N_ALIGN(name_len) + body_len;
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next_state = GotSymlink;
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state = Collect;
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return 0;
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}
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if (S_ISREG(mode) || !body_len)
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read_into(name_buf, N_ALIGN(name_len), GotName);
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return 0;
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}
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static int __init do_skip(void)
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{
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if (this_header + byte_count < next_header) {
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eat(byte_count);
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return 1;
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} else {
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eat(next_header - this_header);
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state = next_state;
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return 0;
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}
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}
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static int __init do_reset(void)
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{
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while (byte_count && *victim == '\0')
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eat(1);
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if (byte_count && (this_header & 3))
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error("broken padding");
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return 1;
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}
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static void __init clean_path(char *path, umode_t fmode)
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{
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struct kstat st;
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if (!init_stat(path, &st, AT_SYMLINK_NOFOLLOW) &&
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(st.mode ^ fmode) & S_IFMT) {
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if (S_ISDIR(st.mode))
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init_rmdir(path);
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else
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init_unlink(path);
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}
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}
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static int __init maybe_link(void)
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{
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if (nlink >= 2) {
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char *old = find_link(major, minor, ino, mode, collected);
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if (old) {
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clean_path(collected, 0);
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return (init_link(old, collected) < 0) ? -1 : 1;
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}
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}
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return 0;
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}
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static __initdata struct file *wfile;
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static __initdata loff_t wfile_pos;
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static int __init do_name(void)
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{
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state = SkipIt;
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next_state = Reset;
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if (strcmp(collected, "TRAILER!!!") == 0) {
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free_hash();
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return 0;
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}
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clean_path(collected, mode);
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if (S_ISREG(mode)) {
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int ml = maybe_link();
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if (ml >= 0) {
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int openflags = O_WRONLY|O_CREAT;
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if (ml != 1)
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openflags |= O_TRUNC;
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wfile = filp_open(collected, openflags, mode);
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if (IS_ERR(wfile))
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return 0;
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wfile_pos = 0;
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vfs_fchown(wfile, uid, gid);
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vfs_fchmod(wfile, mode);
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if (body_len)
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vfs_truncate(&wfile->f_path, body_len);
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state = CopyFile;
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}
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} else if (S_ISDIR(mode)) {
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init_mkdir(collected, mode);
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init_chown(collected, uid, gid, 0);
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init_chmod(collected, mode);
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dir_add(collected, mtime);
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} else if (S_ISBLK(mode) || S_ISCHR(mode) ||
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S_ISFIFO(mode) || S_ISSOCK(mode)) {
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if (maybe_link() == 0) {
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init_mknod(collected, mode, rdev);
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init_chown(collected, uid, gid, 0);
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init_chmod(collected, mode);
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do_utime(collected, mtime);
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}
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}
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return 0;
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}
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static int __init do_copy(void)
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{
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if (byte_count >= body_len) {
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struct timespec64 t[2] = { };
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if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len)
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error("write error");
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t[0].tv_sec = mtime;
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t[1].tv_sec = mtime;
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vfs_utimes(&wfile->f_path, t);
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fput(wfile);
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eat(body_len);
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state = SkipIt;
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return 0;
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} else {
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if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count)
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error("write error");
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body_len -= byte_count;
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eat(byte_count);
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return 1;
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}
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}
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static int __init do_symlink(void)
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{
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collected[N_ALIGN(name_len) + body_len] = '\0';
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clean_path(collected, 0);
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init_symlink(collected + N_ALIGN(name_len), collected);
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init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW);
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do_utime(collected, mtime);
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state = SkipIt;
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next_state = Reset;
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return 0;
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}
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static __initdata int (*actions[])(void) = {
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[Start] = do_start,
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[Collect] = do_collect,
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[GotHeader] = do_header,
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[SkipIt] = do_skip,
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[GotName] = do_name,
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[CopyFile] = do_copy,
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[GotSymlink] = do_symlink,
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[Reset] = do_reset,
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};
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static long __init write_buffer(char *buf, unsigned long len)
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{
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byte_count = len;
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victim = buf;
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while (!actions[state]())
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;
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return len - byte_count;
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}
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static long __init flush_buffer(void *bufv, unsigned long len)
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{
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char *buf = (char *) bufv;
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long written;
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long origLen = len;
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if (message)
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return -1;
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while ((written = write_buffer(buf, len)) < len && !message) {
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char c = buf[written];
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if (c == '0') {
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buf += written;
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len -= written;
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state = Start;
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} else if (c == 0) {
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buf += written;
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len -= written;
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state = Reset;
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} else
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error("junk within compressed archive");
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}
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return origLen;
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}
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static unsigned long my_inptr; /* index of next byte to be processed in inbuf */
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#include <linux/decompress/generic.h>
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static char * __init unpack_to_rootfs(char *buf, unsigned long len)
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{
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long written;
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decompress_fn decompress;
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const char *compress_name;
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static __initdata char msg_buf[64];
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header_buf = kmalloc(110, GFP_KERNEL);
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symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
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name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
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if (!header_buf || !symlink_buf || !name_buf)
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panic_show_mem("can't allocate buffers");
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state = Start;
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this_header = 0;
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message = NULL;
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while (!message && len) {
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loff_t saved_offset = this_header;
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if (*buf == '0' && !(this_header & 3)) {
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state = Start;
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written = write_buffer(buf, len);
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buf += written;
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len -= written;
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continue;
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}
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if (!*buf) {
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buf++;
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len--;
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this_header++;
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continue;
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}
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this_header = 0;
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decompress = decompress_method(buf, len, &compress_name);
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pr_debug("Detected %s compressed data\n", compress_name);
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if (decompress) {
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int res = decompress(buf, len, NULL, flush_buffer, NULL,
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&my_inptr, error);
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if (res)
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error("decompressor failed");
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} else if (compress_name) {
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if (!message) {
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snprintf(msg_buf, sizeof msg_buf,
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"compression method %s not configured",
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compress_name);
|
|
message = msg_buf;
|
|
}
|
|
} else
|
|
error("invalid magic at start of compressed archive");
|
|
if (state != Reset)
|
|
error("junk at the end of compressed archive");
|
|
this_header = saved_offset + my_inptr;
|
|
buf += my_inptr;
|
|
len -= my_inptr;
|
|
}
|
|
dir_utime();
|
|
kfree(name_buf);
|
|
kfree(symlink_buf);
|
|
kfree(header_buf);
|
|
return message;
|
|
}
|
|
|
|
static int __initdata do_retain_initrd;
|
|
|
|
static int __init retain_initrd_param(char *str)
|
|
{
|
|
if (*str)
|
|
return 0;
|
|
do_retain_initrd = 1;
|
|
return 1;
|
|
}
|
|
__setup("retain_initrd", retain_initrd_param);
|
|
|
|
#ifdef CONFIG_ARCH_HAS_KEEPINITRD
|
|
static int __init keepinitrd_setup(char *__unused)
|
|
{
|
|
do_retain_initrd = 1;
|
|
return 1;
|
|
}
|
|
__setup("keepinitrd", keepinitrd_setup);
|
|
#endif
|
|
|
|
static bool __initdata initramfs_async = true;
|
|
static int __init initramfs_async_setup(char *str)
|
|
{
|
|
strtobool(str, &initramfs_async);
|
|
return 1;
|
|
}
|
|
__setup("initramfs_async=", initramfs_async_setup);
|
|
|
|
extern char __initramfs_start[];
|
|
extern unsigned long __initramfs_size;
|
|
#include <linux/initrd.h>
|
|
#include <linux/kexec.h>
|
|
|
|
void __init reserve_initrd_mem(void)
|
|
{
|
|
phys_addr_t start;
|
|
unsigned long size;
|
|
|
|
/* Ignore the virtul address computed during device tree parsing */
|
|
initrd_start = initrd_end = 0;
|
|
|
|
if (!phys_initrd_size)
|
|
return;
|
|
/*
|
|
* Round the memory region to page boundaries as per free_initrd_mem()
|
|
* This allows us to detect whether the pages overlapping the initrd
|
|
* are in use, but more importantly, reserves the entire set of pages
|
|
* as we don't want these pages allocated for other purposes.
|
|
*/
|
|
start = round_down(phys_initrd_start, PAGE_SIZE);
|
|
size = phys_initrd_size + (phys_initrd_start - start);
|
|
size = round_up(size, PAGE_SIZE);
|
|
|
|
if (!memblock_is_region_memory(start, size)) {
|
|
pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
|
|
(u64)start, size);
|
|
goto disable;
|
|
}
|
|
|
|
if (memblock_is_region_reserved(start, size)) {
|
|
pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
|
|
(u64)start, size);
|
|
goto disable;
|
|
}
|
|
|
|
memblock_reserve(start, size);
|
|
/* Now convert initrd to virtual addresses */
|
|
initrd_start = (unsigned long)__va(phys_initrd_start);
|
|
initrd_end = initrd_start + phys_initrd_size;
|
|
initrd_below_start_ok = 1;
|
|
|
|
return;
|
|
disable:
|
|
pr_cont(" - disabling initrd\n");
|
|
initrd_start = 0;
|
|
initrd_end = 0;
|
|
}
|
|
|
|
void __weak __init free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
#ifdef CONFIG_ARCH_KEEP_MEMBLOCK
|
|
unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE);
|
|
unsigned long aligned_end = ALIGN(end, PAGE_SIZE);
|
|
|
|
memblock_free(__pa(aligned_start), aligned_end - aligned_start);
|
|
#endif
|
|
|
|
free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
|
|
"initrd");
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
static bool __init kexec_free_initrd(void)
|
|
{
|
|
unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
|
|
unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
|
|
|
|
/*
|
|
* If the initrd region is overlapped with crashkernel reserved region,
|
|
* free only memory that is not part of crashkernel region.
|
|
*/
|
|
if (initrd_start >= crashk_end || initrd_end <= crashk_start)
|
|
return false;
|
|
|
|
/*
|
|
* Initialize initrd memory region since the kexec boot does not do.
|
|
*/
|
|
memset((void *)initrd_start, 0, initrd_end - initrd_start);
|
|
if (initrd_start < crashk_start)
|
|
free_initrd_mem(initrd_start, crashk_start);
|
|
if (initrd_end > crashk_end)
|
|
free_initrd_mem(crashk_end, initrd_end);
|
|
return true;
|
|
}
|
|
#else
|
|
static inline bool kexec_free_initrd(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_KEXEC_CORE */
|
|
|
|
#ifdef CONFIG_BLK_DEV_RAM
|
|
static void __init populate_initrd_image(char *err)
|
|
{
|
|
ssize_t written;
|
|
struct file *file;
|
|
loff_t pos = 0;
|
|
|
|
unpack_to_rootfs(__initramfs_start, __initramfs_size);
|
|
|
|
printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n",
|
|
err);
|
|
file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700);
|
|
if (IS_ERR(file))
|
|
return;
|
|
|
|
written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start,
|
|
&pos);
|
|
if (written != initrd_end - initrd_start)
|
|
pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
|
|
written, initrd_end - initrd_start);
|
|
fput(file);
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_RAM */
|
|
|
|
static void __init do_populate_rootfs(void *unused, async_cookie_t cookie)
|
|
{
|
|
/* Load the built in initramfs */
|
|
char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
|
|
if (err)
|
|
panic_show_mem("%s", err); /* Failed to decompress INTERNAL initramfs */
|
|
|
|
if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE))
|
|
goto done;
|
|
|
|
if (IS_ENABLED(CONFIG_BLK_DEV_RAM))
|
|
printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
|
|
else
|
|
printk(KERN_INFO "Unpacking initramfs...\n");
|
|
|
|
err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start);
|
|
if (err) {
|
|
#ifdef CONFIG_BLK_DEV_RAM
|
|
populate_initrd_image(err);
|
|
#else
|
|
printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
|
|
#endif
|
|
}
|
|
|
|
done:
|
|
/*
|
|
* If the initrd region is overlapped with crashkernel reserved region,
|
|
* free only memory that is not part of crashkernel region.
|
|
*/
|
|
if (!do_retain_initrd && initrd_start && !kexec_free_initrd())
|
|
free_initrd_mem(initrd_start, initrd_end);
|
|
initrd_start = 0;
|
|
initrd_end = 0;
|
|
|
|
flush_delayed_fput();
|
|
}
|
|
|
|
static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain);
|
|
static async_cookie_t initramfs_cookie;
|
|
|
|
void wait_for_initramfs(void)
|
|
{
|
|
if (!initramfs_cookie) {
|
|
/*
|
|
* Something before rootfs_initcall wants to access
|
|
* the filesystem/initramfs. Probably a bug. Make a
|
|
* note, avoid deadlocking the machine, and let the
|
|
* caller's access fail as it used to.
|
|
*/
|
|
pr_warn_once("wait_for_initramfs() called before rootfs_initcalls\n");
|
|
return;
|
|
}
|
|
async_synchronize_cookie_domain(initramfs_cookie + 1, &initramfs_domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(wait_for_initramfs);
|
|
|
|
static int __init populate_rootfs(void)
|
|
{
|
|
initramfs_cookie = async_schedule_domain(do_populate_rootfs, NULL,
|
|
&initramfs_domain);
|
|
usermodehelper_enable();
|
|
if (!initramfs_async)
|
|
wait_for_initramfs();
|
|
return 0;
|
|
}
|
|
rootfs_initcall(populate_rootfs);
|