diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 95 | ||||
| -rw-r--r-- | init/do_mounts.c | 1 | ||||
| -rw-r--r-- | init/do_mounts_rd.c | 178 | ||||
| -rw-r--r-- | init/initramfs.c | 200 | ||||
| -rw-r--r-- | init/main.c | 25 |
5 files changed, 239 insertions, 260 deletions
diff --git a/init/Kconfig b/init/Kconfig index f068071fcc5..1398a14b019 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -101,6 +101,66 @@ config LOCALVERSION_AUTO which is done within the script "scripts/setlocalversion".) +config HAVE_KERNEL_GZIP + bool + +config HAVE_KERNEL_BZIP2 + bool + +config HAVE_KERNEL_LZMA + bool + +choice + prompt "Kernel compression mode" + default KERNEL_GZIP + depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA + help + The linux kernel is a kind of self-extracting executable. + Several compression algorithms are available, which differ + in efficiency, compression and decompression speed. + Compression speed is only relevant when building a kernel. + Decompression speed is relevant at each boot. + + If you have any problems with bzip2 or lzma compressed + kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older + version of this functionality (bzip2 only), for 2.4, was + supplied by Christian Ludwig) + + High compression options are mostly useful for users, who + are low on disk space (embedded systems), but for whom ram + size matters less. + + If in doubt, select 'gzip' + +config KERNEL_GZIP + bool "Gzip" + depends on HAVE_KERNEL_GZIP + help + The old and tried gzip compression. Its compression ratio is + the poorest among the 3 choices; however its speed (both + compression and decompression) is the fastest. + +config KERNEL_BZIP2 + bool "Bzip2" + depends on HAVE_KERNEL_BZIP2 + help + Its compression ratio and speed is intermediate. + Decompression speed is slowest among the three. The kernel + size is about 10% smaller with bzip2, in comparison to gzip. + Bzip2 uses a large amount of memory. For modern kernels you + will need at least 8MB RAM or more for booting. + +config KERNEL_LZMA + bool "LZMA" + depends on HAVE_KERNEL_LZMA + help + The most recent compression algorithm. + Its ratio is best, decompression speed is between the other + two. Compression is slowest. The kernel size is about 33% + smaller with LZMA in comparison to gzip. + +endchoice + config SWAP bool "Support for paging of anonymous memory (swap)" depends on MMU && BLOCK @@ -471,7 +531,7 @@ config CGROUP_DEVICE config CPUSETS bool "Cpuset support" - depends on SMP && CGROUPS + depends on CGROUPS help This option will let you create and manage CPUSETs which allow dynamically partitioning a system into sets of CPUs and @@ -537,6 +597,8 @@ config CGROUP_MEM_RES_CTLR_SWAP is disabled by boot option, this will be automatically disabled and there will be no overhead from this. Even when you set this config=y, if boot option "noswapaccount" is set, swap will not be accounted. + Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page + size is 4096bytes, 512k per 1Gbytes of swap. endif # CGROUPS @@ -675,6 +737,9 @@ config CC_OPTIMIZE_FOR_SIZE config SYSCTL bool +config ANON_INODES + bool + menuconfig EMBEDDED bool "Configure standard kernel features (for small systems)" help @@ -780,18 +845,6 @@ config PCSPKR_PLATFORM This option allows to disable the internal PC-Speaker support, saving some memory. -config COMPAT_BRK - bool "Disable heap randomization" - default y - help - Randomizing heap placement makes heap exploits harder, but it - also breaks ancient binaries (including anything libc5 based). - This option changes the bootup default to heap randomization - disabled, and can be overriden runtime by setting - /proc/sys/kernel/randomize_va_space to 2. - - On non-ancient distros (post-2000 ones) N is usually a safe choice. - config BASE_FULL default y bool "Enable full-sized data structures for core" if EMBEDDED @@ -809,9 +862,6 @@ config FUTEX support for "fast userspace mutexes". The resulting kernel may not run glibc-based applications correctly. -config ANON_INODES - bool - config EPOLL bool "Enable eventpoll support" if EMBEDDED default y @@ -897,6 +947,18 @@ config SLUB_DEBUG SLUB sysfs support. /sys/slab will not exist and there will be no support for cache validation etc. +config COMPAT_BRK + bool "Disable heap randomization" + default y + help + Randomizing heap placement makes heap exploits harder, but it + also breaks ancient binaries (including anything libc5 based). + This option changes the bootup default to heap randomization + disabled, and can be overriden runtime by setting + /proc/sys/kernel/randomize_va_space to 2. + + On non-ancient distros (post-2000 ones) N is usually a safe choice. + choice prompt "Choose SLAB allocator" default SLUB @@ -966,7 +1028,6 @@ config SLABINFO config RT_MUTEXES boolean - select PLIST config BASE_SMALL int diff --git a/init/do_mounts.c b/init/do_mounts.c index 8d4ff5afc1d..dd7ee5f203f 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -14,6 +14,7 @@ #include <linux/fs.h> #include <linux/initrd.h> #include <linux/async.h> +#include <linux/fs_struct.h> #include <linux/nfs_fs.h> #include <linux/nfs_fs_sb.h> diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c index 0f0f0cf3ba9..027a402708d 100644 --- a/init/do_mounts_rd.c +++ b/init/do_mounts_rd.c @@ -11,6 +11,9 @@ #include "do_mounts.h" #include "../fs/squashfs/squashfs_fs.h" +#include <linux/decompress/generic.h> + + int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */ static int __init prompt_ramdisk(char *str) @@ -29,7 +32,7 @@ static int __init ramdisk_start_setup(char *str) } __setup("ramdisk_start=", ramdisk_start_setup); -static int __init crd_load(int in_fd, int out_fd); +static int __init crd_load(int in_fd, int out_fd, decompress_fn deco); /* * This routine tries to find a RAM disk image to load, and returns the @@ -38,15 +41,15 @@ static int __init crd_load(int in_fd, int out_fd); * numbers could not be found. * * We currently check for the following magic numbers: - * minix - * ext2 + * minix + * ext2 * romfs * cramfs * squashfs - * gzip + * gzip */ -static int __init -identify_ramdisk_image(int fd, int start_block) +static int __init +identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) { const int size = 512; struct minix_super_block *minixsb; @@ -56,6 +59,7 @@ identify_ramdisk_image(int fd, int start_block) struct squashfs_super_block *squashfsb; int nblocks = -1; unsigned char *buf; + const char *compress_name; buf = kmalloc(size, GFP_KERNEL); if (!buf) @@ -69,18 +73,19 @@ identify_ramdisk_image(int fd, int start_block) memset(buf, 0xe5, size); /* - * Read block 0 to test for gzipped kernel + * Read block 0 to test for compressed kernel */ sys_lseek(fd, start_block * BLOCK_SIZE, 0); sys_read(fd, buf, size); - /* - * If it matches the gzip magic numbers, return 0 - */ - if (buf[0] == 037 && ((buf[1] == 0213) || (buf[1] == 0236))) { - printk(KERN_NOTICE - "RAMDISK: Compressed image found at block %d\n", - start_block); + *decompressor = decompress_method(buf, size, &compress_name); + if (compress_name) { + printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n", + compress_name, start_block); + if (!*decompressor) + printk(KERN_EMERG + "RAMDISK: %s decompressor not configured!\n", + compress_name); nblocks = 0; goto done; } @@ -142,7 +147,7 @@ identify_ramdisk_image(int fd, int start_block) printk(KERN_NOTICE "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", start_block); - + done: sys_lseek(fd, start_block * BLOCK_SIZE, 0); kfree(buf); @@ -157,6 +162,7 @@ int __init rd_load_image(char *from) int nblocks, i, disk; char *buf = NULL; unsigned short rotate = 0; + decompress_fn decompressor = NULL; #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) char rotator[4] = { '|' , '/' , '-' , '\\' }; #endif @@ -169,12 +175,12 @@ int __init rd_load_image(char *from) if (in_fd < 0) goto noclose_input; - nblocks = identify_ramdisk_image(in_fd, rd_image_start); + nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor); if (nblocks < 0) goto done; if (nblocks == 0) { - if (crd_load(in_fd, out_fd) == 0) + if (crd_load(in_fd, out_fd, decompressor) == 0) goto successful_load; goto done; } @@ -200,7 +206,7 @@ int __init rd_load_image(char *from) nblocks, rd_blocks); goto done; } - + /* * OK, time to copy in the data */ @@ -273,138 +279,48 @@ int __init rd_load_disk(int n) return rd_load_image("/dev/root"); } -/* - * gzip declarations - */ - -#define OF(args) args - -#ifndef memzero -#define memzero(s, n) memset ((s), 0, (n)) -#endif - -typedef unsigned char uch; -typedef unsigned short ush; -typedef unsigned long ulg; - -#define INBUFSIZ 4096 -#define WSIZE 0x8000 /* window size--must be a power of two, and */ - /* at least 32K for zip's deflate method */ - -static uch *inbuf; -static uch *window; - -static unsigned insize; /* valid bytes in inbuf */ -static unsigned inptr; /* index of next byte to be processed in inbuf */ -static unsigned outcnt; /* bytes in output buffer */ static int exit_code; -static int unzip_error; -static long bytes_out; +static int decompress_error; static int crd_infd, crd_outfd; -#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) - -/* Diagnostic functions (stubbed out) */ -#define Assert(cond,msg) -#define Trace(x) -#define Tracev(x) -#define Tracevv(x) -#define Tracec(c,x) -#define Tracecv(c,x) - -#define STATIC static -#define INIT __init - -static int __init fill_inbuf(void); -static void __init flush_window(void); -static void __init error(char *m); - -#define NO_INFLATE_MALLOC - -#include "../lib/inflate.c" - -/* =========================================================================== - * Fill the input buffer. This is called only when the buffer is empty - * and at least one byte is really needed. - * Returning -1 does not guarantee that gunzip() will ever return. - */ -static int __init fill_inbuf(void) +static int __init compr_fill(void *buf, unsigned int len) { - if (exit_code) return -1; - - insize = sys_read(crd_infd, inbuf, INBUFSIZ); - if (insize == 0) { - error("RAMDISK: ran out of compressed data"); - return -1; - } - - inptr = 1; - - return inbuf[0]; + int r = sys_read(crd_infd, buf, len); + if (r < 0) + printk(KERN_ERR "RAMDISK: error while reading compressed data"); + else if (r == 0) + printk(KERN_ERR "RAMDISK: EOF while reading compressed data"); + return r; } -/* =========================================================================== - * Write the output window window[0..outcnt-1] and update crc and bytes_out. - * (Used for the decompressed data only.) - */ -static void __init flush_window(void) +static int __init compr_flush(void *window, unsigned int outcnt) { - ulg c = crc; /* temporary variable */ - unsigned n, written; - uch *in, ch; - - written = sys_write(crd_outfd, window, outcnt); - if (written != outcnt && unzip_error == 0) { - printk(KERN_ERR "RAMDISK: incomplete write (%d != %d) %ld\n", - written, outcnt, bytes_out); - unzip_error = 1; - } - in = window; - for (n = 0; n < outcnt; n++) { - ch = *in++; - c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); - } - crc = c; - bytes_out += (ulg)outcnt; - outcnt = 0; + int written = sys_write(crd_outfd, window, outcnt); + if (written != outcnt) { + if (decompress_error == 0) + printk(KERN_ERR + "RAMDISK: incomplete write (%d != %d)\n", + written, outcnt); + decompress_error = 1; + return -1; + } + return outcnt; } static void __init error(char *x) { printk(KERN_ERR "%s\n", x); exit_code = 1; - unzip_error = 1; + decompress_error = 1; } -static int __init crd_load(int in_fd, int out_fd) +static int __init crd_load(int in_fd, int out_fd, decompress_fn deco) { int result; - - insize = 0; /* valid bytes in inbuf */ - inptr = 0; /* index of next byte to be processed in inbuf */ - outcnt = 0; /* bytes in output buffer */ - exit_code = 0; - bytes_out = 0; - crc = (ulg)0xffffffffL; /* shift register contents */ - crd_infd = in_fd; crd_outfd = out_fd; - inbuf = kmalloc(INBUFSIZ, GFP_KERNEL); - if (!inbuf) { - printk(KERN_ERR "RAMDISK: Couldn't allocate gzip buffer\n"); - return -1; - } - window = kmalloc(WSIZE, GFP_KERNEL); - if (!window) { - printk(KERN_ERR "RAMDISK: Couldn't allocate gzip window\n"); - kfree(inbuf); - return -1; - } - makecrc(); - result = gunzip(); - if (unzip_error) + result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error); + if (decompress_error) result = 1; - kfree(inbuf); - kfree(window); return result; } diff --git a/init/initramfs.c b/init/initramfs.c index d9c941c0c3c..80cd713f6cc 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -5,6 +5,7 @@ #include <linux/fcntl.h> #include <linux/delay.h> #include <linux/string.h> +#include <linux/dirent.h> #include <linux/syscalls.h> #include <linux/utime.h> @@ -166,8 +167,6 @@ static __initdata char *victim; static __initdata unsigned count; static __initdata loff_t this_header, next_header; -static __initdata int dry_run; - static inline void __init eat(unsigned n) { victim += n; @@ -229,10 +228,6 @@ static int __init do_header(void) parse_header(collected); next_header = this_header + N_ALIGN(name_len) + body_len; next_header = (next_header + 3) & ~3; - if (dry_run) { - read_into(name_buf, N_ALIGN(name_len), GotName); - return 0; - } state = SkipIt; if (name_len <= 0 || name_len > PATH_MAX) return 0; @@ -303,8 +298,6 @@ static int __init do_name(void) free_hash(); return 0; } - if (dry_run) - return 0; clean_path(collected, mode); if (S_ISREG(mode)) { int ml = maybe_link(); @@ -390,11 +383,13 @@ static int __init write_buffer(char *buf, unsigned len) return len - count; } -static void __init flush_buffer(char *buf, unsigned len) +static int __init flush_buffer(void *bufv, unsigned len) { + char *buf = (char *) bufv; int written; + int origLen = len; if (message) - return; + return -1; while ((written = write_buffer(buf, len)) < len && !message) { char c = buf[written]; if (c == '0') { @@ -408,84 +403,27 @@ static void __init flush_buffer(char *buf, unsigned len) } else error("junk in compressed archive"); } + return origLen; } -/* - * gzip declarations - */ - -#define OF(args) args - -#ifndef memzero -#define memzero(s, n) memset ((s), 0, (n)) -#endif - -typedef unsigned char uch; -typedef unsigned short ush; -typedef unsigned long ulg; +static unsigned my_inptr; /* index of next byte to be processed in inbuf */ -#define WSIZE 0x8000 /* window size--must be a power of two, and */ - /* at least 32K for zip's deflate method */ - -static uch *inbuf; -static uch *window; - -static unsigned insize; /* valid bytes in inbuf */ -static unsigned inptr; /* index of next byte to be processed in inbuf */ -static unsigned outcnt; /* bytes in output buffer */ -static long bytes_out; - -#define get_byte() (inptr < insize ? inbuf[inptr++] : -1) - -/* Diagnostic functions (stubbed out) */ -#define Assert(cond,msg) -#define Trace(x) -#define Tracev(x) -#define Tracevv(x) -#define Tracec(c,x) -#define Tracecv(c,x) - -#define STATIC static -#define INIT __init - -static void __init flush_window(void); -static void __init error(char *m); - -#define NO_INFLATE_MALLOC - -#include "../lib/inflate.c" - -/* =========================================================================== - * Write the output window window[0..outcnt-1] and update crc and bytes_out. - * (Used for the decompressed data only.) - */ -static void __init flush_window(void) -{ - ulg c = crc; /* temporary variable */ - unsigned n; - uch *in, ch; - - flush_buffer(window, outcnt); - in = window; - for (n = 0; n < outcnt; n++) { - ch = *in++; - c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); - } - crc = c; - bytes_out += (ulg)outcnt; - outcnt = 0; -} +#include <linux/decompress/generic.h> -static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) +static char * __init unpack_to_rootfs(char *buf, unsigned len) { int written; - dry_run = check_only; + decompress_fn decompress; + const char *compress_name; + static __initdata char msg_buf[64]; + header_buf = kmalloc(110, GFP_KERNEL); symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); - window = kmalloc(WSIZE, GFP_KERNEL); - if (!window || !header_buf || !symlink_buf || !name_buf) + + if (!header_buf || !symlink_buf || !name_buf) panic("can't allocate buffers"); + state = Start; this_header = 0; message = NULL; @@ -505,22 +443,25 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) continue; } this_header = 0; - insize = len; - inbuf = buf; - inptr = 0; - outcnt = 0; /* bytes in output buffer */ - bytes_out = 0; - crc = (ulg)0xffffffffL; /* shift register contents */ - makecrc(); - gunzip(); + decompress = decompress_method(buf, len, &compress_name); + if (decompress) + decompress(buf, len, NULL, flush_buffer, NULL, + &my_inptr, error); + else if (compress_name) { + if (!message) { + snprintf(msg_buf, sizeof msg_buf, + "compression method %s not configured", + compress_name); + message = msg_buf; + } + } if (state != Reset) - error("junk in gzipped archive"); - this_header = saved_offset + inptr; - buf += inptr; - len -= inptr; + error("junk in compressed archive"); + this_header = saved_offset + my_inptr; + buf += my_inptr; + len -= my_inptr; } dir_utime(); - kfree(window); kfree(name_buf); kfree(symlink_buf); kfree(header_buf); @@ -574,26 +515,76 @@ skip: initrd_end = 0; } +#define BUF_SIZE 1024 +static void __init clean_rootfs(void) +{ + int fd; + void *buf; + struct linux_dirent64 *dirp; + int count; + + fd = sys_open("/", O_RDONLY, 0); + WARN_ON(fd < 0); + if (fd < 0) + return; + buf = kzalloc(BUF_SIZE, GFP_KERNEL); + WARN_ON(!buf); + if (!buf) { + sys_close(fd); + return; + } + + dirp = buf; + count = sys_getdents64(fd, dirp, BUF_SIZE); + while (count > 0) { + while (count > 0) { + struct stat st; + int ret; + + ret = sys_newlstat(dirp->d_name, &st); + WARN_ON_ONCE(ret); + if (!ret) { + if (S_ISDIR(st.st_mode)) + sys_rmdir(dirp->d_name); + else + sys_unlink(dirp->d_name); + } + + count -= dirp->d_reclen; + dirp = (void *)dirp + dirp->d_reclen; + } + dirp = buf; + memset(buf, 0, BUF_SIZE); + count = sys_getdents64(fd, dirp, BUF_SIZE); + } + + sys_close(fd); + kfree(buf); +} + static int __init populate_rootfs(void) { char *err = unpack_to_rootfs(__initramfs_start, - __initramfs_end - __initramfs_start, 0); + __initramfs_end - __initramfs_start); if (err) - panic(err); + panic(err); /* Failed to decompress INTERNAL initramfs */ if (initrd_start) { #ifdef CONFIG_BLK_DEV_RAM int fd; - printk(KERN_INFO "checking if image is initramfs..."); + printk(KERN_INFO "checking if image is initramfs...\n"); err = unpack_to_rootfs((char *)initrd_start, - initrd_end - initrd_start, 1); + initrd_end - initrd_start); if (!err) { - printk(" it is\n"); - unpack_to_rootfs((char *)initrd_start, - initrd_end - initrd_start, 0); + printk(KERN_INFO "rootfs image is initramfs; unpacking...\n"); free_initrd(); return 0; + } else { + clean_rootfs(); + unpack_to_rootfs(__initramfs_start, + __initramfs_end - __initramfs_start); } - printk("it isn't (%s); looks like an initrd\n", err); + printk(KERN_INFO "rootfs image is not initramfs (%s)" + "; looks like an initrd\n", err); fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700); if (fd >= 0) { sys_write(fd, (char *)initrd_start, @@ -604,10 +595,13 @@ static int __init populate_rootfs(void) #else printk(KERN_INFO "Unpacking initramfs..."); err = unpack_to_rootfs((char *)initrd_start, - initrd_end - initrd_start, 0); - if (err) - panic(err); - printk(" done\n"); + initrd_end - initrd_start); + if (err) { + printk(" failed!\n"); + printk(KERN_EMERG "%s\n", err); + } else { + printk(" done\n"); + } free_initrd(); #endif } diff --git a/init/main.c b/init/main.c index 83697e160b3..07c8658ffca 100644 --- a/init/main.c +++ b/init/main.c @@ -14,6 +14,7 @@ #include <linux/proc_fs.h> #include <linux/kernel.h> #include <linux/syscalls.h> +#include <linux/stackprotector.h> #include <linux/string.h> #include <linux/ctype.h> #include <linux/delay.h> @@ -135,14 +136,14 @@ unsigned int __initdata setup_max_cpus = NR_CPUS; * greater than 0, limits the maximum number of CPUs activated in * SMP mode to <NUM>. */ -#ifndef CONFIG_X86_IO_APIC -static inline void disable_ioapic_setup(void) {}; -#endif + +void __weak arch_disable_smp_support(void) { } static int __init nosmp(char *str) { setup_max_cpus = 0; - disable_ioapic_setup(); + arch_disable_smp_support(); + return 0; } @@ -152,14 +153,14 @@ static int __init maxcpus(char *str) { get_option(&str, &setup_max_cpus); if (setup_max_cpus == 0) - disable_ioapic_setup(); + arch_disable_smp_support(); return 0; } early_param("maxcpus", maxcpus); #else -#define setup_max_cpus NR_CPUS +const unsigned int setup_max_cpus = NR_CPUS; #endif /* @@ -406,8 +407,7 @@ static void __init smp_init(void) * Set up the current CPU as possible to migrate to. * The other ones will be done by cpu_up/cpu_down() */ - cpu = smp_processor_id(); - cpu_set(cpu, cpu_active_map); + set_cpu_active(smp_processor_id(), true); /* FIXME: This should be done in userspace --RR */ for_each_present_cpu(cpu) { @@ -540,6 +540,12 @@ asmlinkage void __init start_kernel(void) */ lockdep_init(); debug_objects_early_init(); + + /* + * Set up the the initial canary ASAP: + */ + boot_init_stack_canary(); + cgroup_init_early(); local_irq_disable(); @@ -787,6 +793,7 @@ static void run_init_process(char *init_filename) * makes it inline to init() and it becomes part of init.text section */ static noinline int init_post(void) + __releases(kernel_lock) { /* need to finish all async __init code before freeing the memory */ async_synchronize_full(); @@ -835,7 +842,7 @@ static int __init kernel_init(void * unused) /* * init can run on any cpu. */ - set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR); + set_cpus_allowed_ptr(current, cpu_all_mask); /* * Tell the world that we're going to be the grim * reaper of innocent orphaned children. |