magic-number.rst (10289B)
1.. _cn_magicnumbers: 2 3.. include:: ../disclaimer-zh_CN.rst 4 5:Original: :ref:`Documentation/process/magic-number.rst <magicnumbers>` 6 7如果想评论或更新本文的内容，请直接发信到LKML。如果你使用英文交流有困难的话，也可 8以向中文版维护者求助。如果本翻译更新不及时或者翻译存在问题，请联系中文版维护者:: 9 10 中文版维护者： 贾威威 Jia Wei Wei <harryxiyou@gmail.com> 11 中文版翻译者： 贾威威 Jia Wei Wei <harryxiyou@gmail.com> 12 中文版校译者： 贾威威 Jia Wei Wei <harryxiyou@gmail.com> 13 14Linux 魔术数 15============ 16 17这个文件是有关当前使用的魔术值注册表。当你给一个结构添加了一个魔术值，你也应该把这个魔术值添加到这个文件，因为我们最好把用于各种结构的魔术值统一起来。 18 19使用魔术值来保护内核数据结构是一个非常好的主意。这就允许你在运行期检查(a)一个结构是否已经被攻击，或者(b)你已经给一个例行程序通过了一个错误的结构。后一种情况特别地有用---特别是当你通过一个空指针指向结构体的时候。tty源码，例如，经常通过特定驱动使用这种方法并且反复地排列特定方面的结构。 20 21使用魔术值的方法是在结构的开始处声明的，如下:: 22 23 struct tty_ldisc { 24 int magic; 25 ... 26 }; 27 28当你以后给内核添加增强功能的时候，请遵守这条规则！这样就会节省数不清的调试时间，特别是一些古怪的情况，例如，数组超出范围并且重新写了超出部分。遵守这个规则，这些情况可以被快速地，安全地避免。 29 30 Theodore Ts'o 31 31 Mar 94 32 33给当前的Linux 2.1.55添加魔术表。 34 35 Michael Chastain 36 <mailto:mec@shout.net> 37 22 Sep 1997 38 39现在应该最新的Linux 2.1.112.因为在特性冻结期间，不能在2.2.x前改变任何东西。这些条目被数域所排序。 40 41 Krzysztof G.Baranowski 42 <mailto: kgb@knm.org.pl> 43 29 Jul 1998 44 45更新魔术表到Linux 2.5.45。刚好越过特性冻结，但是有可能还会有一些新的魔术值在2.6.x之前融入到内核中。 46 47 Petr Baudis 48 <pasky@ucw.cz> 49 03 Nov 2002 50 51更新魔术表到Linux 2.5.74。 52 53 Fabian Frederick 54 <ffrederick@users.sourceforge.net> 55 09 Jul 2003 56 57===================== ================ ======================== ========================================== 58魔术数名 数字 结构 文件 59===================== ================ ======================== ========================================== 60PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h`` 61CMAGIC 0x0111 user ``include/linux/a.out.h`` 62MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h`` 63HDLC_MAGIC 0x239e n_hdlc ``drivers/char/n_hdlc.c`` 64APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c`` 65DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c`` 66DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c`` 67FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h`` 68FF_MAGIC 0x4646 fc_info ``drivers/net/iph5526_novram.c`` 69PTY_MAGIC 0x5001 ``drivers/char/pty.c`` 70PPP_MAGIC 0x5002 ppp ``include/linux/if_pppvar.h`` 71SSTATE_MAGIC 0x5302 serial_state ``include/linux/serial.h`` 72SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h`` 73STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c`` 74SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h`` 75AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h`` 76TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h`` 77MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c`` 78TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h`` 79MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c`` 80USB_SERIAL_MAGIC 0x6702 usb_serial ``drivers/usb/serial/usb-serial.h`` 81FULL_DUPLEX_MAGIC 0x6969 ``drivers/net/ethernet/dec/tulip/de2104x.c`` 82USB_BLUETOOTH_MAGIC 0x6d02 usb_bluetooth ``drivers/usb/class/bluetty.c`` 83RFCOMM_TTY_MAGIC 0x6d02 ``net/bluetooth/rfcomm/tty.c`` 84USB_SERIAL_PORT_MAGIC 0x7301 usb_serial_port ``drivers/usb/serial/usb-serial.h`` 85CG_MAGIC 0x00090255 ufs_cylinder_group ``include/linux/ufs_fs.h`` 86LSEMAGIC 0x05091998 lse ``drivers/fc4/fc.c`` 87GDTIOCTL_MAGIC 0x06030f07 gdth_iowr_str ``drivers/scsi/gdth_ioctl.h`` 88RIEBL_MAGIC 0x09051990 ``drivers/net/atarilance.c`` 89NBD_REQUEST_MAGIC 0x12560953 nbd_request ``include/linux/nbd.h`` 90RED_MAGIC2 0x170fc2a5 (any) ``mm/slab.c`` 91BAYCOM_MAGIC 0x19730510 baycom_state ``drivers/net/baycom_epp.c`` 92ISDN_X25IFACE_MAGIC 0x1e75a2b9 isdn_x25iface_proto_data ``drivers/isdn/isdn_x25iface.h`` 93ECP_MAGIC 0x21504345 cdkecpsig ``include/linux/cdk.h`` 94LSOMAGIC 0x27091997 lso ``drivers/fc4/fc.c`` 95LSMAGIC 0x2a3b4d2a ls ``drivers/fc4/fc.c`` 96WANPIPE_MAGIC 0x414C4453 sdla_{dump,exec} ``include/linux/wanpipe.h`` 97CS_CARD_MAGIC 0x43525553 cs_card ``sound/oss/cs46xx.c`` 98LABELCL_MAGIC 0x4857434c labelcl_info_s ``include/asm/ia64/sn/labelcl.h`` 99ISDN_ASYNC_MAGIC 0x49344C01 modem_info ``include/linux/isdn.h`` 100CTC_ASYNC_MAGIC 0x49344C01 ctc_tty_info ``drivers/s390/net/ctctty.c`` 101ISDN_NET_MAGIC 0x49344C02 isdn_net_local_s ``drivers/isdn/i4l/isdn_net_lib.h`` 102SAVEKMSG_MAGIC2 0x4B4D5347 savekmsg ``arch/*/amiga/config.c`` 103CS_STATE_MAGIC 0x4c4f4749 cs_state ``sound/oss/cs46xx.c`` 104SLAB_C_MAGIC 0x4f17a36d kmem_cache ``mm/slab.c`` 105COW_MAGIC 0x4f4f4f4d cow_header_v1 ``arch/um/drivers/ubd_user.c`` 106I810_CARD_MAGIC 0x5072696E i810_card ``sound/oss/i810_audio.c`` 107TRIDENT_CARD_MAGIC 0x5072696E trident_card ``sound/oss/trident.c`` 108ROUTER_MAGIC 0x524d4157 wan_device [in ``wanrouter.h`` pre 3.9] 109SAVEKMSG_MAGIC1 0x53415645 savekmsg ``arch/*/amiga/config.c`` 110GDA_MAGIC 0x58464552 gda ``arch/mips/include/asm/sn/gda.h`` 111RED_MAGIC1 0x5a2cf071 (any) ``mm/slab.c`` 112EEPROM_MAGIC_VALUE 0x5ab478d2 lanai_dev ``drivers/atm/lanai.c`` 113HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state ``include/linux/hdlcdrv.h`` 114PCXX_MAGIC 0x5c6df104 channel ``drivers/char/pcxx.h`` 115KV_MAGIC 0x5f4b565f kernel_vars_s ``arch/mips/include/asm/sn/klkernvars.h`` 116I810_STATE_MAGIC 0x63657373 i810_state ``sound/oss/i810_audio.c`` 117TRIDENT_STATE_MAGIC 0x63657373 trient_state ``sound/oss/trident.c`` 118M3_CARD_MAGIC 0x646e6f50 m3_card ``sound/oss/maestro3.c`` 119FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fore200e.h`` 120SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h`` 121SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h`` 122LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h`` 123M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c`` 124VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c`` 125KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c`` 126PWC_MAGIC 0x89DC10AB pwc_device ``drivers/usb/media/pwc.h`` 127NBD_REPLY_MAGIC 0x96744668 nbd_reply ``include/linux/nbd.h`` 128ENI155_MAGIC 0xa54b872d midway_eprom ``drivers/atm/eni.h`` 129CODA_MAGIC 0xC0DAC0DA coda_file_info ``fs/coda/coda_fs_i.h`` 130DPMEM_MAGIC 0xc0ffee11 gdt_pci_sram ``drivers/scsi/gdth.h`` 131YAM_MAGIC 0xF10A7654 yam_port ``drivers/net/hamradio/yam.c`` 132CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c`` 133QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry ``drivers/scsi/arm/queue.c`` 134QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry ``drivers/scsi/arm/queue.c`` 135HTB_CMAGIC 0xFEFAFEF1 htb_class ``net/sched/sch_htb.c`` 136NMI_MAGIC 0x48414d4d455201 nmi_s ``arch/mips/include/asm/sn/nmi.h`` 137===================== ================ ======================== ========================================== 138 139 140请注意，在声音记忆管理中仍然有一些特殊的为每个驱动定义的魔术值。查看include/sound/sndmagic.h来获取他们完整的列表信息。很多OSS声音驱动拥有自己从声卡PCI ID构建的魔术值-他们也没有被列在这里。 141 142IrDA子系统也使用了大量的自己的魔术值，查看include/net/irda/irda.h来获取他们完整的信息。 143 144HFS是另外一个比较大的使用魔术值的文件系统-你可以在fs/hfs/hfs.h中找到他们。