diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 14 | ||||
| -rw-r--r-- | init/initramfs.c | 76 |
2 files changed, 62 insertions, 28 deletions
diff --git a/init/Kconfig b/init/Kconfig index 8aed339b8e06..7efe7c56893f 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -423,8 +423,8 @@ config CROSS_MEMORY_ATTACH See the man page for more details. config USELIB - bool "uselib syscall" - def_bool ALPHA || M68K || SPARC || X86_32 || IA32_EMULATION + bool "uselib syscall (for libc5 and earlier)" + default ALPHA || M68K || SPARC help This option enables the uselib syscall, a system call used in the dynamic linker from libc5 and earlier. glibc does not use this @@ -1348,6 +1348,16 @@ config BOOT_CONFIG If unsure, say Y. +config INITRAMFS_PRESERVE_MTIME + bool "Preserve cpio archive mtimes in initramfs" + default y + help + Each entry in an initramfs cpio archive carries an mtime value. When + enabled, extracted cpio items take this mtime, with directory mtime + setting deferred until after creation of any child entries. + + If unsure, say Y. + choice prompt "Compiler optimization level" default CC_OPTIMIZE_FOR_PERFORMANCE diff --git a/init/initramfs.c b/init/initramfs.c index 2f3d96dc3db6..dc84cf756cea 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -17,8 +17,11 @@ #include <linux/init_syscalls.h> #include <linux/umh.h> -static ssize_t __init xwrite(struct file *file, const char *p, size_t count, - loff_t *pos) +static __initdata bool csum_present; +static __initdata u32 io_csum; + +static ssize_t __init xwrite(struct file *file, const unsigned char *p, + size_t count, loff_t *pos) { ssize_t out = 0; @@ -33,6 +36,13 @@ static ssize_t __init xwrite(struct file *file, const char *p, size_t count, } else if (rv == 0) break; + if (csum_present) { + ssize_t i; + + for (i = 0; i < rv; i++) + io_csum += p[i]; + } + p += rv; out += rv; count -= rv; @@ -116,31 +126,36 @@ static void __init free_hash(void) } } -static long __init do_utime(char *filename, time64_t mtime) +#ifdef CONFIG_INITRAMFS_PRESERVE_MTIME +static void __init do_utime(char *filename, time64_t mtime) { - struct timespec64 t[2]; + struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; + init_utimes(filename, t); +} - t[0].tv_sec = mtime; - t[0].tv_nsec = 0; - t[1].tv_sec = mtime; - t[1].tv_nsec = 0; - return init_utimes(filename, t); +static void __init do_utime_path(const struct path *path, time64_t mtime) +{ + struct timespec64 t[2] = { { .tv_sec = mtime }, { .tv_sec = mtime } }; + vfs_utimes(path, t); } static __initdata LIST_HEAD(dir_list); struct dir_entry { struct list_head list; - char *name; time64_t mtime; + char name[]; }; static void __init dir_add(const char *name, time64_t mtime) { - struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); + size_t nlen = strlen(name) + 1; + struct dir_entry *de; + + de = kmalloc(sizeof(struct dir_entry) + nlen, GFP_KERNEL); if (!de) panic_show_mem("can't allocate dir_entry buffer"); INIT_LIST_HEAD(&de->list); - de->name = kstrdup(name, GFP_KERNEL); + strscpy(de->name, name, nlen); de->mtime = mtime; list_add(&de->list, &dir_list); } @@ -151,10 +166,15 @@ static void __init dir_utime(void) list_for_each_entry_safe(de, tmp, &dir_list, list) { list_del(&de->list); do_utime(de->name, de->mtime); - kfree(de->name); kfree(de); } } +#else +static void __init do_utime(char *filename, time64_t mtime) {} +static void __init do_utime_path(const struct path *path, time64_t mtime) {} +static void __init dir_add(const char *name, time64_t mtime) {} +static void __init dir_utime(void) {} +#endif static __initdata time64_t mtime; @@ -166,15 +186,16 @@ static __initdata unsigned long body_len, name_len; static __initdata uid_t uid; static __initdata gid_t gid; static __initdata unsigned rdev; +static __initdata u32 hdr_csum; static void __init parse_header(char *s) { - unsigned long parsed[12]; + unsigned long parsed[13]; char buf[9]; int i; buf[8] = '\0'; - for (i = 0, s += 6; i < 12; i++, s += 8) { + for (i = 0, s += 6; i < 13; i++, s += 8) { memcpy(buf, s, 8); parsed[i] = simple_strtoul(buf, NULL, 16); } @@ -189,6 +210,7 @@ static void __init parse_header(char *s) minor = parsed[8]; rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); name_len = parsed[11]; + hdr_csum = parsed[12]; } /* FSM */ @@ -257,12 +279,15 @@ static int __init do_collect(void) static int __init do_header(void) { - if (memcmp(collected, "070707", 6)==0) { - error("incorrect cpio method used: use -H newc option"); - return 1; - } - if (memcmp(collected, "070701", 6)) { - error("no cpio magic"); + if (!memcmp(collected, "070701", 6)) { + csum_present = false; + } else if (!memcmp(collected, "070702", 6)) { + csum_present = true; + } else { + if (memcmp(collected, "070707", 6) == 0) + error("incorrect cpio method used: use -H newc option"); + else + error("no cpio magic"); return 1; } parse_header(collected); @@ -353,6 +378,7 @@ static int __init do_name(void) if (IS_ERR(wfile)) return 0; wfile_pos = 0; + io_csum = 0; vfs_fchown(wfile, uid, gid); vfs_fchmod(wfile, mode); @@ -380,15 +406,13 @@ static int __init do_name(void) static int __init do_copy(void) { if (byte_count >= body_len) { - struct timespec64 t[2] = { }; if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) error("write error"); - t[0].tv_sec = mtime; - t[1].tv_sec = mtime; - vfs_utimes(&wfile->f_path, t); - + do_utime_path(&wfile->f_path, mtime); fput(wfile); + if (csum_present && io_csum != hdr_csum) + error("bad data checksum"); eat(body_len); state = SkipIt; return 0; |