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- This file is a registry of magic numbers which are in use. When you
- add a magic number to a structure, you should also add it to this
- file, since it is best if the magic numbers used by various structures
- are unique.
- It is a *very* good idea to protect kernel data structures with magic
- numbers. This allows you to check at run time whether (a) a structure
- has been clobbered, or (b) you've passed the wrong structure to a
- routine. This last is especially useful --- particularly when you are
- passing pointers to structures via a void * pointer. The tty code,
- for example, does this frequently to pass driver-specific and line
- discipline-specific structures back and forth.
- The way to use magic numbers is to declare then at the beginning of
- the structure, like so:
- struct tty_ldisc {
- int magic;
- ...
- };
- Please follow this discipline when you are adding future enhancements
- to the kernel! It has saved me countless hours of debugging,
- especially in the screwy cases where an array has been overrun and
- structures following the array have been overwritten. Using this
- discipline, these cases get detected quickly and safely.
- Theodore Ts'o
- 31 Mar 94
- The magic table is current to Linux 2.1.55.
- Michael Chastain
- <mailto:mec@shout.net>
- 22 Sep 1997
- Now it should be up to date with Linux 2.1.112. Because
- we are in feature freeze time it is very unlikely that
- something will change before 2.2.x. The entries are
- sorted by number field.
- Krzysztof G. Baranowski
- <mailto: kgb@knm.org.pl>
- 29 Jul 1998
- Updated the magic table to Linux 2.5.45. Right over the feature freeze,
- but it is possible that some new magic numbers will sneak into the
- kernel before 2.6.x yet.
- Petr Baudis
- <pasky@ucw.cz>
- 03 Nov 2002
- Updated the magic table to Linux 2.5.74.
- Fabian Frederick
- <ffrederick@users.sourceforge.net>
- 09 Jul 2003
- Magic Name Number Structure File
- ===========================================================================
- 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
- CYCLADES_MAGIC 0x4359 cyclades_port include/linux/cyclades.h
- 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
- ISICOM_MAGIC 0x4d54 isi_port include/linux/isicom.h
- PTY_MAGIC 0x5001 drivers/char/pty.c
- PPP_MAGIC 0x5002 ppp include/linux/if_pppvar.h
- SERIAL_MAGIC 0x5301 async_struct include/linux/serial.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
- X25_ASY_MAGIC 0x5303 x25_asy drivers/net/x25_asy.h
- 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
- TTY_LDISC_MAGIC 0x5403 tty_ldisc include/linux/tty_ldisc.h
- 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
- RPORT_MAGIC 0x00525001 r_port drivers/char/rocket_int.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
- OPROFILE_MAGIC 0x6f70726f super_block drivers/oprofile/oprofilefs.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
- Note that there are also defined special per-driver magic numbers in sound
- memory management. See include/sound/sndmagic.h for complete list of them. Many
- OSS sound drivers have their magic numbers constructed from the soundcard PCI
- ID - these are not listed here as well.
- IrDA subsystem also uses large number of own magic numbers, see
- include/net/irda/irda.h for a complete list of them.
- HFS is another larger user of magic numbers - you can find them in
- fs/hfs/hfs.h.
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