| .. SPDX-License-Identifier: GPL-2.0 |
| |
| .. _tw_magicnumbers: |
| |
| .. include:: ../disclaimer-zh_TW.rst |
| |
| :Original: :ref:`Documentation/process/magic-number.rst <magicnumbers>` |
| |
| 如果想評論或更新本文的內容，請直接發信到LKML。如果你使用英文交流有困難的話，也可 |
| 以向中文版維護者求助。如果本翻譯更新不及時或者翻譯存在問題，請聯繫中文版維護者:: |
| |
| 中文版維護者： 賈威威 Jia Wei Wei <harryxiyou@gmail.com> |
| 中文版翻譯者： 賈威威 Jia Wei Wei <harryxiyou@gmail.com> |
| 中文版校譯者： 賈威威 Jia Wei Wei <harryxiyou@gmail.com> |
| 胡皓文 Hu Haowen <src.res@email.cn> |
| |
| Linux 魔術數 |
| ============ |
| |
| 這個文件是有關當前使用的魔術值註冊表。當你給一個結構添加了一個魔術值，你也應該把這個魔術值添加到這個文件，因爲我們最好把用於各種結構的魔術值統一起來。 |
| |
| 使用魔術值來保護內核數據結構是一個非常好的主意。這就允許你在運行期檢查(a)一個結構是否已經被攻擊，或者(b)你已經給一個例行程序通過了一個錯誤的結構。後一種情況特別地有用---特別是當你通過一個空指針指向結構體的時候。tty源碼，例如，經常通過特定驅動使用這種方法並且反覆地排列特定方面的結構。 |
| |
| 使用魔術值的方法是在結構的開始處聲明的，如下:: |
| |
| struct tty_ldisc { |
| int magic; |
| ... |
| }; |
| |
| 當你以後給內核添加增強功能的時候，請遵守這條規則！這樣就會節省數不清的調試時間，特別是一些古怪的情況，例如，數組超出範圍並且重新寫了超出部分。遵守這個規則，這些情況可以被快速地，安全地避免。 |
| |
| Theodore Ts'o |
| 31 Mar 94 |
| |
| 給當前的Linux 2.1.55添加魔術表。 |
| |
| Michael Chastain |
| <mailto:mec@shout.net> |
| 22 Sep 1997 |
| |
| 現在應該最新的Linux 2.1.112.因爲在特性凍結期間，不能在2.2.x前改變任何東西。這些條目被數域所排序。 |
| |
| Krzysztof G.Baranowski |
| <mailto: kgb@knm.org.pl> |
| 29 Jul 1998 |
| |
| 更新魔術表到Linux 2.5.45。剛好越過特性凍結，但是有可能還會有一些新的魔術值在2.6.x之前融入到內核中。 |
| |
| Petr Baudis |
| <pasky@ucw.cz> |
| 03 Nov 2002 |
| |
| 更新魔術表到Linux 2.5.74。 |
| |
| Fabian Frederick |
| <ffrederick@users.sourceforge.net> |
| 09 Jul 2003 |
| |
| ===================== ================ ======================== ========================================== |
| 魔術數名 數字 結構 文件 |
| ===================== ================ ======================== ========================================== |
| PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h`` |
| CMAGIC 0x0111 user ``include/linux/a.out.h`` |
| MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h`` |
| HDLC_MAGIC 0x239e n_hdlc ``drivers/char/n_hdlc.c`` |
| APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c`` |
| DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c`` |
| DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c`` |
| FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h`` |
| FF_MAGIC 0x4646 fc_info ``drivers/net/iph5526_novram.c`` |
| PTY_MAGIC 0x5001 ``drivers/char/pty.c`` |
| PPP_MAGIC 0x5002 ppp ``include/linux/if_pppvar.h`` |
| SSTATE_MAGIC 0x5302 serial_state ``include/linux/serial.h`` |
| SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h`` |
| STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c`` |
| SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h`` |
| AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h`` |
| TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h`` |
| MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c`` |
| TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h`` |
| MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c`` |
| USB_SERIAL_MAGIC 0x6702 usb_serial ``drivers/usb/serial/usb-serial.h`` |
| FULL_DUPLEX_MAGIC 0x6969 ``drivers/net/ethernet/dec/tulip/de2104x.c`` |
| USB_BLUETOOTH_MAGIC 0x6d02 usb_bluetooth ``drivers/usb/class/bluetty.c`` |
| RFCOMM_TTY_MAGIC 0x6d02 ``net/bluetooth/rfcomm/tty.c`` |
| USB_SERIAL_PORT_MAGIC 0x7301 usb_serial_port ``drivers/usb/serial/usb-serial.h`` |
| CG_MAGIC 0x00090255 ufs_cylinder_group ``include/linux/ufs_fs.h`` |
| LSEMAGIC 0x05091998 lse ``drivers/fc4/fc.c`` |
| GDTIOCTL_MAGIC 0x06030f07 gdth_iowr_str ``drivers/scsi/gdth_ioctl.h`` |
| RIEBL_MAGIC 0x09051990 ``drivers/net/atarilance.c`` |
| NBD_REQUEST_MAGIC 0x12560953 nbd_request ``include/linux/nbd.h`` |
| RED_MAGIC2 0x170fc2a5 (any) ``mm/slab.c`` |
| BAYCOM_MAGIC 0x19730510 baycom_state ``drivers/net/baycom_epp.c`` |
| ISDN_X25IFACE_MAGIC 0x1e75a2b9 isdn_x25iface_proto_data ``drivers/isdn/isdn_x25iface.h`` |
| ECP_MAGIC 0x21504345 cdkecpsig ``include/linux/cdk.h`` |
| LSOMAGIC 0x27091997 lso ``drivers/fc4/fc.c`` |
| LSMAGIC 0x2a3b4d2a ls ``drivers/fc4/fc.c`` |
| WANPIPE_MAGIC 0x414C4453 sdla_{dump,exec} ``include/linux/wanpipe.h`` |
| CS_CARD_MAGIC 0x43525553 cs_card ``sound/oss/cs46xx.c`` |
| LABELCL_MAGIC 0x4857434c labelcl_info_s ``include/asm/ia64/sn/labelcl.h`` |
| ISDN_ASYNC_MAGIC 0x49344C01 modem_info ``include/linux/isdn.h`` |
| CTC_ASYNC_MAGIC 0x49344C01 ctc_tty_info ``drivers/s390/net/ctctty.c`` |
| ISDN_NET_MAGIC 0x49344C02 isdn_net_local_s ``drivers/isdn/i4l/isdn_net_lib.h`` |
| SAVEKMSG_MAGIC2 0x4B4D5347 savekmsg ``arch/*/amiga/config.c`` |
| CS_STATE_MAGIC 0x4c4f4749 cs_state ``sound/oss/cs46xx.c`` |
| SLAB_C_MAGIC 0x4f17a36d kmem_cache ``mm/slab.c`` |
| COW_MAGIC 0x4f4f4f4d cow_header_v1 ``arch/um/drivers/ubd_user.c`` |
| I810_CARD_MAGIC 0x5072696E i810_card ``sound/oss/i810_audio.c`` |
| TRIDENT_CARD_MAGIC 0x5072696E trident_card ``sound/oss/trident.c`` |
| ROUTER_MAGIC 0x524d4157 wan_device [in ``wanrouter.h`` pre 3.9] |
| SAVEKMSG_MAGIC1 0x53415645 savekmsg ``arch/*/amiga/config.c`` |
| GDA_MAGIC 0x58464552 gda ``arch/mips/include/asm/sn/gda.h`` |
| RED_MAGIC1 0x5a2cf071 (any) ``mm/slab.c`` |
| EEPROM_MAGIC_VALUE 0x5ab478d2 lanai_dev ``drivers/atm/lanai.c`` |
| HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state ``include/linux/hdlcdrv.h`` |
| PCXX_MAGIC 0x5c6df104 channel ``drivers/char/pcxx.h`` |
| KV_MAGIC 0x5f4b565f kernel_vars_s ``arch/mips/include/asm/sn/klkernvars.h`` |
| I810_STATE_MAGIC 0x63657373 i810_state ``sound/oss/i810_audio.c`` |
| TRIDENT_STATE_MAGIC 0x63657373 trient_state ``sound/oss/trident.c`` |
| M3_CARD_MAGIC 0x646e6f50 m3_card ``sound/oss/maestro3.c`` |
| FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fore200e.h`` |
| SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h`` |
| SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h`` |
| LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h`` |
| M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c`` |
| VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c`` |
| KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c`` |
| PWC_MAGIC 0x89DC10AB pwc_device ``drivers/usb/media/pwc.h`` |
| NBD_REPLY_MAGIC 0x96744668 nbd_reply ``include/linux/nbd.h`` |
| ENI155_MAGIC 0xa54b872d midway_eprom ``drivers/atm/eni.h`` |
| CODA_MAGIC 0xC0DAC0DA coda_file_info ``fs/coda/coda_fs_i.h`` |
| DPMEM_MAGIC 0xc0ffee11 gdt_pci_sram ``drivers/scsi/gdth.h`` |
| YAM_MAGIC 0xF10A7654 yam_port ``drivers/net/hamradio/yam.c`` |
| CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c`` |
| QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry ``drivers/scsi/arm/queue.c`` |
| QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry ``drivers/scsi/arm/queue.c`` |
| HTB_CMAGIC 0xFEFAFEF1 htb_class ``net/sched/sch_htb.c`` |
| NMI_MAGIC 0x48414d4d455201 nmi_s ``arch/mips/include/asm/sn/nmi.h`` |
| ===================== ================ ======================== ========================================== |
| |
| |
| 請注意，在聲音記憶管理中仍然有一些特殊的爲每個驅動定義的魔術值。查看include/sound/sndmagic.h來獲取他們完整的列表信息。很多OSS聲音驅動擁有自己從音效卡PCI ID構建的魔術值-他們也沒有被列在這裡。 |
| |
| IrDA子系統也使用了大量的自己的魔術值，查看include/net/irda/irda.h來獲取他們完整的信息。 |
| |
| HFS是另外一個比較大的使用魔術值的文件系統-你可以在fs/hfs/hfs.h中找到他們。 |
| |
