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1da177e Linux-2.6.12-rc2
Linus Torvalds authored
1 This file is a registry of magic numbers which are in use. When you
2 add a magic number to a structure, you should also add it to this
3 file, since it is best if the magic numbers used by various structures
4 are unique.
6 It is a *very* good idea to protect kernel data structures with magic
7 numbers. This allows you to check at run time whether (a) a structure
8 has been clobbered, or (b) you've passed the wrong structure to a
9 routine. This last is especially useful --- particularly when you are
10 passing pointers to structures via a void * pointer. The tty code,
11 for example, does this frequently to pass driver-specific and line
12 discipline-specific structures back and forth.
14 The way to use magic numbers is to declare then at the beginning of
15 the structure, like so:
17 struct tty_ldisc {
18 int magic;
19 ...
20 };
22 Please follow this discipline when you are adding future enhancements
23 to the kernel! It has saved me countless hours of debugging,
24 especially in the screwy cases where an array has been overrun and
25 structures following the array have been overwritten. Using this
26 discipline, these cases get detected quickly and safely.
28 Theodore Ts'o
29 31 Mar 94
31 The magic table is current to Linux 2.1.55.
33 Michael Chastain
34 <>
35 22 Sep 1997
37 Now it should be up to date with Linux 2.1.112. Because
38 we are in feature freeze time it is very unlikely that
39 something will change before 2.2.x. The entries are
40 sorted by number field.
42 Krzysztof G. Baranowski
43 <mailto:>
44 29 Jul 1998
46 Updated the magic table to Linux 2.5.45. Right over the feature freeze,
47 but it is possible that some new magic numbers will sneak into the
48 kernel before 2.6.x yet.
50 Petr Baudis
51 <>
52 03 Nov 2002
54 Updated the magic table to Linux 2.5.74.
56 Fabian Frederick
57 <>
58 09 Jul 2003
61 Magic Name Number Structure File
62 ===========================================================================
63 PG_MAGIC 'P' pg_{read,write}_hdr include/linux/pg.h
64 CMAGIC 0x0111 user include/linux/a.out.h
65 MKISS_DRIVER_MAGIC 0x04bf mkiss_channel drivers/net/mkiss.h
66 RISCOM8_MAGIC 0x0907 riscom_port drivers/char/riscom8.h
67 SPECIALIX_MAGIC 0x0907 specialix_port drivers/char/specialix_io8.h
68 HDLC_MAGIC 0x239e n_hdlc drivers/char/n_hdlc.c
25eb650 @gaowanlong doc: fix wrong arch/i386 references
gaowanlong authored
69 APM_BIOS_MAGIC 0x4101 apm_user arch/x86/kernel/apm_32.c
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
70 CYCLADES_MAGIC 0x4359 cyclades_port include/linux/cyclades.h
71 DB_MAGIC 0x4442 fc_info drivers/net/iph5526_novram.c
72 DL_MAGIC 0x444d fc_info drivers/net/iph5526_novram.c
73 FASYNC_MAGIC 0x4601 fasync_struct include/linux/fs.h
74 FF_MAGIC 0x4646 fc_info drivers/net/iph5526_novram.c
75 ISICOM_MAGIC 0x4d54 isi_port include/linux/isicom.h
76 PTY_MAGIC 0x5001 drivers/char/pty.c
77 PPP_MAGIC 0x5002 ppp include/linux/if_pppvar.h
78 SERIAL_MAGIC 0x5301 async_struct include/linux/serial.h
79 SSTATE_MAGIC 0x5302 serial_state include/linux/serial.h
80 SLIP_MAGIC 0x5302 slip drivers/net/slip.h
81 STRIP_MAGIC 0x5303 strip drivers/net/strip.c
82 X25_ASY_MAGIC 0x5303 x25_asy drivers/net/x25_asy.h
83 SIXPACK_MAGIC 0x5304 sixpack drivers/net/hamradio/6pack.h
84 AX25_MAGIC 0x5316 ax_disp drivers/net/mkiss.h
85 ESP_MAGIC 0x53ee esp_struct drivers/char/esp.h
86 TTY_MAGIC 0x5401 tty_struct include/linux/tty.h
87 MGSL_MAGIC 0x5401 mgsl_info drivers/char/synclink.c
88 TTY_DRIVER_MAGIC 0x5402 tty_driver include/linux/tty_driver.h
89 MGSLPC_MAGIC 0x5402 mgslpc_info drivers/char/pcmcia/synclink_cs.c
90 TTY_LDISC_MAGIC 0x5403 tty_ldisc include/linux/tty_ldisc.h
91 USB_SERIAL_MAGIC 0x6702 usb_serial drivers/usb/serial/usb-serial.h
3396c78 @paulgortmaker drivers/net: fix up stale paths from driver reorg
paulgortmaker authored
92 FULL_DUPLEX_MAGIC 0x6969 drivers/net/ethernet/dec/tulip/de2104x.c
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
93 USB_BLUETOOTH_MAGIC 0x6d02 usb_bluetooth drivers/usb/class/bluetty.c
94 RFCOMM_TTY_MAGIC 0x6d02 net/bluetooth/rfcomm/tty.c
95 USB_SERIAL_PORT_MAGIC 0x7301 usb_serial_port drivers/usb/serial/usb-serial.h
96 CG_MAGIC 0x00090255 ufs_cylinder_group include/linux/ufs_fs.h
97 A2232_MAGIC 0x000a2232 gs_port drivers/char/ser_a2232.h
98 RPORT_MAGIC 0x00525001 r_port drivers/char/rocket_int.h
99 LSEMAGIC 0x05091998 lse drivers/fc4/fc.c
100 GDTIOCTL_MAGIC 0x06030f07 gdth_iowr_str drivers/scsi/gdth_ioctl.h
101 RIEBL_MAGIC 0x09051990 drivers/net/atarilance.c
102 RIO_MAGIC 0x12345678 gs_port drivers/char/rio/rio_linux.c
103 SX_MAGIC 0x12345678 gs_port drivers/char/sx.h
104 NBD_REQUEST_MAGIC 0x12560953 nbd_request include/linux/nbd.h
105 RED_MAGIC2 0x170fc2a5 (any) mm/slab.c
106 BAYCOM_MAGIC 0x19730510 baycom_state drivers/net/baycom_epp.c
107 ISDN_X25IFACE_MAGIC 0x1e75a2b9 isdn_x25iface_proto_data
108 drivers/isdn/isdn_x25iface.h
109 ECP_MAGIC 0x21504345 cdkecpsig include/linux/cdk.h
110 LSOMAGIC 0x27091997 lso drivers/fc4/fc.c
111 LSMAGIC 0x2a3b4d2a ls drivers/fc4/fc.c
112 WANPIPE_MAGIC 0x414C4453 sdla_{dump,exec} include/linux/wanpipe.h
113 CS_CARD_MAGIC 0x43525553 cs_card sound/oss/cs46xx.c
114 LABELCL_MAGIC 0x4857434c labelcl_info_s include/asm/ia64/sn/labelcl.h
115 ISDN_ASYNC_MAGIC 0x49344C01 modem_info include/linux/isdn.h
116 CTC_ASYNC_MAGIC 0x49344C01 ctc_tty_info drivers/s390/net/ctctty.c
117 ISDN_NET_MAGIC 0x49344C02 isdn_net_local_s drivers/isdn/i4l/isdn_net_lib.h
118 SAVEKMSG_MAGIC2 0x4B4D5347 savekmsg arch/*/amiga/config.c
119 STLI_BOARDMAGIC 0x4bc6c825 stlibrd include/linux/istallion.h
120 CS_STATE_MAGIC 0x4c4f4749 cs_state sound/oss/cs46xx.c
2109a2d [PATCH] mm: rename kmem_cache_s to kmem_cache
Pekka J Enberg authored
121 SLAB_C_MAGIC 0x4f17a36d kmem_cache mm/slab.c
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
122 COW_MAGIC 0x4f4f4f4d cow_header_v1 arch/um/drivers/ubd_user.c
123 I810_CARD_MAGIC 0x5072696E i810_card sound/oss/i810_audio.c
124 TRIDENT_CARD_MAGIC 0x5072696E trident_card sound/oss/trident.c
125 ROUTER_MAGIC 0x524d4157 wan_device include/linux/wanrouter.h
126 SCC_MAGIC 0x52696368 gs_port drivers/char/scc.h
127 SAVEKMSG_MAGIC1 0x53415645 savekmsg arch/*/amiga/config.c
07983f0 documentation: update header file paths
Randy Dunlap authored
128 GDA_MAGIC 0x58464552 gda arch/mips/include/asm/sn/gda.h
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
129 RED_MAGIC1 0x5a2cf071 (any) mm/slab.c
130 STL_PORTMAGIC 0x5a7182c9 stlport include/linux/stallion.h
b966877 Magic number prefix consistency change to Documentation/magic-number.txt
Jesper Juhl authored
131 EEPROM_MAGIC_VALUE 0x5ab478d2 lanai_dev drivers/atm/lanai.c
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
132 HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state include/linux/hdlcdrv.h
133 EPCA_MAGIC 0x5c6df104 channel include/linux/epca.h
134 PCXX_MAGIC 0x5c6df104 channel drivers/char/pcxx.h
07983f0 documentation: update header file paths
Randy Dunlap authored
135 KV_MAGIC 0x5f4b565f kernel_vars_s arch/mips/include/asm/sn/klkernvars.h
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
136 I810_STATE_MAGIC 0x63657373 i810_state sound/oss/i810_audio.c
137 TRIDENT_STATE_MAGIC 0x63657373 trient_state sound/oss/trident.c
138 M3_CARD_MAGIC 0x646e6f50 m3_card sound/oss/maestro3.c
139 FW_HEADER_MAGIC 0x65726F66 fw_header drivers/atm/fore200e.h
140 SLOT_MAGIC 0x67267321 slot drivers/hotplug/cpqphp.h
141 SLOT_MAGIC 0x67267322 slot drivers/hotplug/acpiphp.h
142 LO_MAGIC 0x68797548 nbd_device include/linux/nbd.h
143 OPROFILE_MAGIC 0x6f70726f super_block drivers/oprofile/oprofilefs.h
144 M3_STATE_MAGIC 0x734d724d m3_state sound/oss/maestro3.c
145 STL_PANELMAGIC 0x7ef621a1 stlpanel include/linux/stallion.h
146 VMALLOC_MAGIC 0x87654320 snd_alloc_track sound/core/memory.c
147 KMALLOC_MAGIC 0x87654321 snd_alloc_track sound/core/memory.c
148 PWC_MAGIC 0x89DC10AB pwc_device drivers/usb/media/pwc.h
149 NBD_REPLY_MAGIC 0x96744668 nbd_reply include/linux/nbd.h
150 STL_BOARDMAGIC 0xa2267f52 stlbrd include/linux/stallion.h
151 ENI155_MAGIC 0xa54b872d midway_eprom drivers/atm/eni.h
152 SCI_MAGIC 0xbabeface gs_port drivers/char/sh-sci.h
31a203d take coda-private headers out of include/linux
Al Viro authored
153 CODA_MAGIC 0xC0DAC0DA coda_file_info fs/coda/coda_fs_i.h
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
154 DPMEM_MAGIC 0xc0ffee11 gdt_pci_sram drivers/scsi/gdth.h
155 STLI_PORTMAGIC 0xe671c7a1 stliport include/linux/istallion.h
156 YAM_MAGIC 0xF10A7654 yam_port drivers/net/hamradio/yam.c
157 CCB_MAGIC 0xf2691ad2 ccb drivers/scsi/ncr53c8xx.c
158 QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry drivers/scsi/arm/queue.c
159 QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry drivers/scsi/arm/queue.c
160 HTB_CMAGIC 0xFEFAFEF1 htb_class net/sched/sch_htb.c
07983f0 documentation: update header file paths
Randy Dunlap authored
161 NMI_MAGIC 0x48414d4d455201 nmi_s arch/mips/include/asm/sn/nmi.h
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
163 Note that there are also defined special per-driver magic numbers in sound
164 memory management. See include/sound/sndmagic.h for complete list of them. Many
165 OSS sound drivers have their magic numbers constructed from the soundcard PCI
166 ID - these are not listed here as well.
168 IrDA subsystem also uses large number of own magic numbers, see
169 include/net/irda/irda.h for a complete list of them.
171 HFS is another larger user of magic numbers - you can find them in
172 fs/hfs/hfs.h.
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