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Linux 魔术数¶
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。
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。
使用魔术值的方法是在结构的开始处声明的,如下:
struct tty_ldisc {
int magic;
...
};
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。
- Theodore Ts’o
- 31 Mar 94
给当前的Linux 2.1.55添加魔术表。
Michael Chastain <mailto:mec@shout.net> 22 Sep 1997
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。
Krzysztof G.Baranowski <mailto: kgb@knm.org.pl> 29 Jul 1998
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。
Petr Baudis <pasky@ucw.cz> 03 Nov 2002
更新魔术表到Linux 2.5.74。
Fabian Frederick <ffrederick@users.sourceforge.net> 09 Jul 2003
魔术数名 | 数字 | 结构 | 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 |
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 |
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 |
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。
IrDA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。
HFS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。