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Linux Capability

linux-2.6.38.y include/linux/capability.h に定義された POSIX Capability の一覧

※ 自分用メモ

Linux Capability 一覧

No Capability Description
0 CAP_CHOWN In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
overrides the restriction of changing file ownership and group ownership.
1 CAP_DAC_OVERRIDE Override all DAC access, including ACL execute access if
[_POSIX_ACL] is defined. Excluding DAC access covered by
2 CAP_DAC_READ_SEARCH Overrides all DAC restrictions regarding read and search on files
and directories, including ACL restrictions if [_POSIX_ACL] is
defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE.
3 CAP_FOWNER Overrides all restrictions about allowed operations on files, where
file owner ID must be equal to the user ID, except where CAP_FSETID
is applicable. It doesn't override MAC and DAC restrictions.
4 CAP_FSETID Overrides the following restrictions that the effective user ID
shall match the file owner ID when setting the S_ISUID and S_ISGID
bits on that file; that the effective group ID (or one of the
supplementary group IDs) shall match the file owner ID when setting
the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
cleared on successful return from chown(2) (not implemented).
5 CAP_KILL Overrides the restriction that the real or effective user ID of a
process sending a signal must match the real or effective user ID
of the process receiving the signal.
6 CAP_SETGID Allows setgid(2) manipulation
Allows setgroups(2)
Allows forged gids on socket credentials passing.
7 CAP_SETUID Allows set*uid(2) manipulation (including fsuid).
Allows forged pids on socket credentials passing.
8 CAP_SETPCAP Without VFS support for capabilities:
  Transfer any capability in your permitted set to any pid,
  remove any capability in your permitted set from any pid
With VFS support for capabilities (neither of above, but)
  Add any capability from current's capability bounding set
      to the current process' inheritable set
  Allow taking bits out of capability bounding set
  Allow modification of the securebits for a process
9 CAP_LINUX_IMMUTABLE Allow modification of S_IMMUTABLE and S_APPEND file attributes
10 CAP_NET_BIND_SERVICE Allows binding to TCP/UDP sockets below 1024
Allows binding to ATM VCIs below 32
11 CAP_NET_BROADCAST Allow broadcasting, listen to multicast
12 CAP_NET_ADMIN Allow interface configuration
Allow administration of IP firewall, masquerading and accounting
Allow setting debug option on sockets
Allow modification of routing tables
Allow setting arbitrary process / process group ownership on
sockets
Allow binding to any address for transparent proxying
Allow setting TOS (type of service)
Allow setting promiscuous mode
Allow clearing driver statistics
Allow multicasting
Allow read/write of device-specific registers
Allow activation of ATM control sockets
13 CAP_NET_RAW Allow use of RAW sockets
Allow use of PACKET sockets
14 CAP_IPC_LOCK Allow locking of shared memory segments
Allow mlock and mlockall (which doesn't really have anything to do
with IPC)
15 CAP_IPC_OWNER Override IPC ownership checks
16 CAP_SYS_MODULE Insert and remove kernel modules - modify kernel without limit
17 CAP_SYS_RAWIO Allow ioperm/iopl access
Allow sending USB messages to any device via /proc/bus/usb
18 CAP_SYS_CHROOT Allow use of chroot()
19 CAP_SYS_PTRACE Allow ptrace() of any process
20 CAP_SYS_PACCT Allow configuration of process accounting
21 CAP_SYS_ADMIN Allow configuration of the secure attention key
Allow administration of the random device
Allow examination and configuration of disk quotas
Allow setting the domainname
Allow setting the hostname
Allow calling bdflush()
Allow mount() and umount(), setting up new smb connection
Allow some autofs root ioctls
Allow nfsservctl
Allow VM86_REQUEST_IRQ
Allow to read/write pci config on alpha
Allow irix_prctl on mips (setstacksize)
Allow flushing all cache on m68k (sys_cacheflush)
Allow removing semaphores
Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
and shared memory
Allow locking/unlocking of shared memory segment
Allow turning swap on/off
Allow forged pids on socket credentials passing
Allow setting readahead and flushing buffers on block devices
Allow setting geometry in floppy driver
Allow turning DMA on/off in xd driver
Allow administration of md devices (mostly the above, but some
extra ioctls)
Allow tuning the ide driver
Allow access to the nvram device
Allow administration of apm_bios, serial and bttv (TV) device
Allow manufacturer commands in isdn CAPI support driver
Allow reading non-standardized portions of pci configuration space
Allow DDI debug ioctl on sbpcd driver
Allow setting up serial ports
Allow sending raw qic-117 commands
Allow enabling/disabling tagged queuing on SCSI controllers and sending
arbitrary SCSI commands
Allow setting encryption key on loopback filesystem
Allow setting zone reclaim policy
22 CAP_SYS_BOOT Allow use of reboot()
23 CAP_SYS_NICE Allow raising priority and setting priority on other (different
UID) processes
Allow use of FIFO and round-robin (realtime) scheduling on own
processes and setting the scheduling algorithm used by another
process.
Allow setting cpu affinity on other processes
24 CAP_SYS_RESOURCE Override resource limits. Set resource limits.
Override quota limits.
Override reserved space on ext2 filesystem
Modify data journaling mode on ext3 filesystem (uses journaling
resources)
NOTE: ext2 honors fsuid when checking for resource overrides, so
you can override using fsuid too
Override size restrictions on IPC message queues
Allow more than 64hz interrupts from the real-time clock
Override max number of consoles on console allocation
Override max number of keymaps
25 CAP_SYS_TIME Allow manipulation of system clock
Allow irix_stime on mips
Allow setting the real-time clock
26 CAP_SYS_TTY_CONFIG Allow configuration of tty devices
Allow vhangup() of tty
27 CAP_MKNOD Allow the privileged aspects of mknod()
28 CAP_LEASE Allow taking of leases on files
29 CAP_AUDIT_WRITE Allow taking of leases on files
30 CAP_AUDIT_CONTROL Allow taking of leases on files
31 CAP_SETFCAP Allow taking of leases on files
32 CAP_MAC_OVERRIDE Override MAC access.
The base kernel enforces no MAC policy.
An LSM may enforce a MAC policy, and if it does and it chooses
to implement capability based overrides of that policy, this is
the capability it should use to do so.
33 CAP_MAC_ADMIN Allow MAC configuration or state changes.
The base kernel requires no MAC configuration.
An LSM may enforce a MAC policy, and if it does and it chooses
to implement capability based checks on modifications to that
policy or the data required to maintain it, this is the
capability it should use to do so.
34 CAP_SYSLOG Allow configuring the kernel's syslog (printk behaviour)

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