forked from luck/tmp_suning_uos_patched
ca05a99a54
Source code out there hard-codes a notion of what the
_LINUX_CAPABILITY_VERSION #define means in terms of the semantics of the
raw capability system calls capget() and capset(). Its unfortunate, but
true.
Since the confusing header file has been in a released kernel, there is
software that is erroneously using 64-bit capabilities with the semantics
of 32-bit compatibilities. These recently compiled programs may suffer
corruption of their memory when sys_getcap() overwrites more memory than
they are coded to expect, and the raising of added capabilities when using
sys_capset().
As such, this patch does a number of things to clean up the situation
for all. It
1. forces the _LINUX_CAPABILITY_VERSION define to always retain its
legacy value.
2. adopts a new #define strategy for the kernel's internal
implementation of the preferred magic.
3. deprecates v2 capability magic in favor of a new (v3) magic
number. The functionality of v3 is entirely equivalent to v2,
the only difference being that the v2 magic causes the kernel
to log a "deprecated" warning so the admin can find applications
that may be using v2 inappropriately.
[User space code continues to be encouraged to use the libcap API which
protects the application from details like this. libcap-2.10 is the first
to support v3 capabilities.]
Fixes issue reported in https://bugzilla.redhat.com/show_bug.cgi?id=447518.
Thanks to Bojan Smojver for the report.
[akpm@linux-foundation.org: s/depreciate/deprecate/g]
[akpm@linux-foundation.org: be robust about put_user size]
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Bojan Smojver <bojan@rexursive.com>
Cc: stable@kernel.org
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
510 lines
15 KiB
C
510 lines
15 KiB
C
/*
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* This is <linux/capability.h>
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*
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* Andrew G. Morgan <morgan@kernel.org>
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* Alexander Kjeldaas <astor@guardian.no>
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* with help from Aleph1, Roland Buresund and Andrew Main.
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*
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* See here for the libcap library ("POSIX draft" compliance):
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*
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* ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
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*/
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#ifndef _LINUX_CAPABILITY_H
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#define _LINUX_CAPABILITY_H
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#include <linux/types.h>
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struct task_struct;
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/* User-level do most of the mapping between kernel and user
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capabilities based on the version tag given by the kernel. The
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kernel might be somewhat backwards compatible, but don't bet on
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it. */
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/* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
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a set of three capability sets. The transposition of 3*the
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following structure to such a composite is better handled in a user
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library since the draft standard requires the use of malloc/free
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etc.. */
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#define _LINUX_CAPABILITY_VERSION_1 0x19980330
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#define _LINUX_CAPABILITY_U32S_1 1
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#define _LINUX_CAPABILITY_VERSION_2 0x20071026 /* deprecated - use v3 */
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#define _LINUX_CAPABILITY_U32S_2 2
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#define _LINUX_CAPABILITY_VERSION_3 0x20080522
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#define _LINUX_CAPABILITY_U32S_3 2
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typedef struct __user_cap_header_struct {
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__u32 version;
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int pid;
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} __user *cap_user_header_t;
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typedef struct __user_cap_data_struct {
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__u32 effective;
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__u32 permitted;
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__u32 inheritable;
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} __user *cap_user_data_t;
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#define XATTR_CAPS_SUFFIX "capability"
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#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
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#define VFS_CAP_REVISION_MASK 0xFF000000
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#define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
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#define VFS_CAP_FLAGS_EFFECTIVE 0x000001
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#define VFS_CAP_REVISION_1 0x01000000
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#define VFS_CAP_U32_1 1
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#define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))
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#define VFS_CAP_REVISION_2 0x02000000
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#define VFS_CAP_U32_2 2
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#define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))
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#define XATTR_CAPS_SZ XATTR_CAPS_SZ_2
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#define VFS_CAP_U32 VFS_CAP_U32_2
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#define VFS_CAP_REVISION VFS_CAP_REVISION_2
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struct vfs_cap_data {
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__le32 magic_etc; /* Little endian */
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struct {
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__le32 permitted; /* Little endian */
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__le32 inheritable; /* Little endian */
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} data[VFS_CAP_U32];
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};
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#ifndef __KERNEL__
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/*
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* Backwardly compatible definition for source code - trapped in a
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* 32-bit world. If you find you need this, please consider using
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* libcap to untrap yourself...
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*/
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#define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1
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#define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1
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#else
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#define _KERNEL_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_3
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#define _KERNEL_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_3
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typedef struct kernel_cap_struct {
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__u32 cap[_KERNEL_CAPABILITY_U32S];
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} kernel_cap_t;
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#define _USER_CAP_HEADER_SIZE (sizeof(struct __user_cap_header_struct))
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#define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
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#endif
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/**
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** POSIX-draft defined capabilities.
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**/
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/* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
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overrides the restriction of changing file ownership and group
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ownership. */
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#define CAP_CHOWN 0
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/* Override all DAC access, including ACL execute access if
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[_POSIX_ACL] is defined. Excluding DAC access covered by
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CAP_LINUX_IMMUTABLE. */
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#define CAP_DAC_OVERRIDE 1
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/* Overrides all DAC restrictions regarding read and search on files
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and directories, including ACL restrictions if [_POSIX_ACL] is
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defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
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#define CAP_DAC_READ_SEARCH 2
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/* Overrides all restrictions about allowed operations on files, where
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file owner ID must be equal to the user ID, except where CAP_FSETID
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is applicable. It doesn't override MAC and DAC restrictions. */
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#define CAP_FOWNER 3
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/* Overrides the following restrictions that the effective user ID
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shall match the file owner ID when setting the S_ISUID and S_ISGID
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bits on that file; that the effective group ID (or one of the
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supplementary group IDs) shall match the file owner ID when setting
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the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
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cleared on successful return from chown(2) (not implemented). */
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#define CAP_FSETID 4
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/* Overrides the restriction that the real or effective user ID of a
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process sending a signal must match the real or effective user ID
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of the process receiving the signal. */
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#define CAP_KILL 5
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/* Allows setgid(2) manipulation */
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/* Allows setgroups(2) */
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/* Allows forged gids on socket credentials passing. */
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#define CAP_SETGID 6
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/* Allows set*uid(2) manipulation (including fsuid). */
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/* Allows forged pids on socket credentials passing. */
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#define CAP_SETUID 7
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/**
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** Linux-specific capabilities
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**/
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/* Without VFS support for capabilities:
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* Transfer any capability in your permitted set to any pid,
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* remove any capability in your permitted set from any pid
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* With VFS support for capabilities (neither of above, but)
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* Add any capability from current's capability bounding set
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* to the current process' inheritable set
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* Allow taking bits out of capability bounding set
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* Allow modification of the securebits for a process
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*/
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#define CAP_SETPCAP 8
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/* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
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#define CAP_LINUX_IMMUTABLE 9
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/* Allows binding to TCP/UDP sockets below 1024 */
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/* Allows binding to ATM VCIs below 32 */
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#define CAP_NET_BIND_SERVICE 10
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/* Allow broadcasting, listen to multicast */
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#define CAP_NET_BROADCAST 11
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/* Allow interface configuration */
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/* Allow administration of IP firewall, masquerading and accounting */
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/* Allow setting debug option on sockets */
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/* Allow modification of routing tables */
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/* Allow setting arbitrary process / process group ownership on
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sockets */
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/* Allow binding to any address for transparent proxying */
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/* Allow setting TOS (type of service) */
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/* Allow setting promiscuous mode */
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/* Allow clearing driver statistics */
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/* Allow multicasting */
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/* Allow read/write of device-specific registers */
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/* Allow activation of ATM control sockets */
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#define CAP_NET_ADMIN 12
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/* Allow use of RAW sockets */
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/* Allow use of PACKET sockets */
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#define CAP_NET_RAW 13
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/* Allow locking of shared memory segments */
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/* Allow mlock and mlockall (which doesn't really have anything to do
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with IPC) */
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#define CAP_IPC_LOCK 14
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/* Override IPC ownership checks */
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#define CAP_IPC_OWNER 15
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/* Insert and remove kernel modules - modify kernel without limit */
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#define CAP_SYS_MODULE 16
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/* Allow ioperm/iopl access */
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/* Allow sending USB messages to any device via /proc/bus/usb */
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#define CAP_SYS_RAWIO 17
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/* Allow use of chroot() */
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#define CAP_SYS_CHROOT 18
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/* Allow ptrace() of any process */
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#define CAP_SYS_PTRACE 19
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/* Allow configuration of process accounting */
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#define CAP_SYS_PACCT 20
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/* Allow configuration of the secure attention key */
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/* Allow administration of the random device */
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/* Allow examination and configuration of disk quotas */
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/* Allow configuring the kernel's syslog (printk behaviour) */
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/* Allow setting the domainname */
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/* Allow setting the hostname */
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/* Allow calling bdflush() */
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/* Allow mount() and umount(), setting up new smb connection */
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/* Allow some autofs root ioctls */
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/* Allow nfsservctl */
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/* Allow VM86_REQUEST_IRQ */
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/* Allow to read/write pci config on alpha */
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/* Allow irix_prctl on mips (setstacksize) */
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/* Allow flushing all cache on m68k (sys_cacheflush) */
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/* Allow removing semaphores */
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/* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
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and shared memory */
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/* Allow locking/unlocking of shared memory segment */
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/* Allow turning swap on/off */
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/* Allow forged pids on socket credentials passing */
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/* Allow setting readahead and flushing buffers on block devices */
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/* Allow setting geometry in floppy driver */
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/* Allow turning DMA on/off in xd driver */
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/* Allow administration of md devices (mostly the above, but some
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extra ioctls) */
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/* Allow tuning the ide driver */
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/* Allow access to the nvram device */
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/* Allow administration of apm_bios, serial and bttv (TV) device */
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/* Allow manufacturer commands in isdn CAPI support driver */
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/* Allow reading non-standardized portions of pci configuration space */
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/* Allow DDI debug ioctl on sbpcd driver */
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/* Allow setting up serial ports */
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/* Allow sending raw qic-117 commands */
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/* Allow enabling/disabling tagged queuing on SCSI controllers and sending
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arbitrary SCSI commands */
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/* Allow setting encryption key on loopback filesystem */
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/* Allow setting zone reclaim policy */
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#define CAP_SYS_ADMIN 21
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/* Allow use of reboot() */
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#define CAP_SYS_BOOT 22
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/* Allow raising priority and setting priority on other (different
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UID) processes */
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/* Allow use of FIFO and round-robin (realtime) scheduling on own
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processes and setting the scheduling algorithm used by another
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process. */
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/* Allow setting cpu affinity on other processes */
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#define CAP_SYS_NICE 23
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/* Override resource limits. Set resource limits. */
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/* Override quota limits. */
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/* Override reserved space on ext2 filesystem */
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/* Modify data journaling mode on ext3 filesystem (uses journaling
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resources) */
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/* NOTE: ext2 honors fsuid when checking for resource overrides, so
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you can override using fsuid too */
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/* Override size restrictions on IPC message queues */
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/* Allow more than 64hz interrupts from the real-time clock */
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/* Override max number of consoles on console allocation */
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/* Override max number of keymaps */
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#define CAP_SYS_RESOURCE 24
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/* Allow manipulation of system clock */
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/* Allow irix_stime on mips */
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/* Allow setting the real-time clock */
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#define CAP_SYS_TIME 25
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/* Allow configuration of tty devices */
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/* Allow vhangup() of tty */
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#define CAP_SYS_TTY_CONFIG 26
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/* Allow the privileged aspects of mknod() */
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#define CAP_MKNOD 27
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/* Allow taking of leases on files */
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#define CAP_LEASE 28
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#define CAP_AUDIT_WRITE 29
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#define CAP_AUDIT_CONTROL 30
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#define CAP_SETFCAP 31
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/* Override MAC access.
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The base kernel enforces no MAC policy.
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An LSM may enforce a MAC policy, and if it does and it chooses
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to implement capability based overrides of that policy, this is
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the capability it should use to do so. */
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#define CAP_MAC_OVERRIDE 32
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/* Allow MAC configuration or state changes.
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The base kernel requires no MAC configuration.
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An LSM may enforce a MAC policy, and if it does and it chooses
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to implement capability based checks on modifications to that
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policy or the data required to maintain it, this is the
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capability it should use to do so. */
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#define CAP_MAC_ADMIN 33
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#define CAP_LAST_CAP CAP_MAC_ADMIN
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#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
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/*
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* Bit location of each capability (used by user-space library and kernel)
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*/
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#define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */
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#define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */
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#ifdef __KERNEL__
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/*
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* Internal kernel functions only
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*/
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#define CAP_FOR_EACH_U32(__capi) \
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for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi)
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# define CAP_FS_MASK_B0 (CAP_TO_MASK(CAP_CHOWN) \
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| CAP_TO_MASK(CAP_DAC_OVERRIDE) \
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| CAP_TO_MASK(CAP_DAC_READ_SEARCH) \
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| CAP_TO_MASK(CAP_FOWNER) \
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| CAP_TO_MASK(CAP_FSETID))
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# define CAP_FS_MASK_B1 (CAP_TO_MASK(CAP_MAC_OVERRIDE))
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#if _KERNEL_CAPABILITY_U32S != 2
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# error Fix up hand-coded capability macro initializers
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#else /* HAND-CODED capability initializers */
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# define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }})
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# define CAP_FULL_SET ((kernel_cap_t){{ ~0, ~0 }})
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# define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }})
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# define CAP_FS_SET ((kernel_cap_t){{ CAP_FS_MASK_B0, CAP_FS_MASK_B1 } })
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# define CAP_NFSD_SET ((kernel_cap_t){{ CAP_FS_MASK_B0|CAP_TO_MASK(CAP_SYS_RESOURCE), \
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CAP_FS_MASK_B1 } })
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#endif /* _KERNEL_CAPABILITY_U32S != 2 */
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#define CAP_INIT_INH_SET CAP_EMPTY_SET
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# define cap_clear(c) do { (c) = __cap_empty_set; } while (0)
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# define cap_set_full(c) do { (c) = __cap_full_set; } while (0)
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# define cap_set_init_eff(c) do { (c) = __cap_init_eff_set; } while (0)
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#define cap_raise(c, flag) ((c).cap[CAP_TO_INDEX(flag)] |= CAP_TO_MASK(flag))
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#define cap_lower(c, flag) ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))
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#define cap_raised(c, flag) ((c).cap[CAP_TO_INDEX(flag)] & CAP_TO_MASK(flag))
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#define CAP_BOP_ALL(c, a, b, OP) \
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do { \
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unsigned __capi; \
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CAP_FOR_EACH_U32(__capi) { \
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c.cap[__capi] = a.cap[__capi] OP b.cap[__capi]; \
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} \
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} while (0)
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#define CAP_UOP_ALL(c, a, OP) \
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do { \
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unsigned __capi; \
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CAP_FOR_EACH_U32(__capi) { \
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c.cap[__capi] = OP a.cap[__capi]; \
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} \
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} while (0)
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static inline kernel_cap_t cap_combine(const kernel_cap_t a,
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const kernel_cap_t b)
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{
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kernel_cap_t dest;
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CAP_BOP_ALL(dest, a, b, |);
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return dest;
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}
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static inline kernel_cap_t cap_intersect(const kernel_cap_t a,
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const kernel_cap_t b)
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{
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kernel_cap_t dest;
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CAP_BOP_ALL(dest, a, b, &);
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return dest;
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}
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static inline kernel_cap_t cap_drop(const kernel_cap_t a,
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const kernel_cap_t drop)
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{
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kernel_cap_t dest;
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CAP_BOP_ALL(dest, a, drop, &~);
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return dest;
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}
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static inline kernel_cap_t cap_invert(const kernel_cap_t c)
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{
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kernel_cap_t dest;
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CAP_UOP_ALL(dest, c, ~);
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return dest;
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}
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static inline int cap_isclear(const kernel_cap_t a)
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{
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unsigned __capi;
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CAP_FOR_EACH_U32(__capi) {
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if (a.cap[__capi] != 0)
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return 0;
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}
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return 1;
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}
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static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
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{
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kernel_cap_t dest;
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dest = cap_drop(a, set);
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return cap_isclear(dest);
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}
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/* Used to decide between falling back on the old suser() or fsuser(). */
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static inline int cap_is_fs_cap(int cap)
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{
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const kernel_cap_t __cap_fs_set = CAP_FS_SET;
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return !!(CAP_TO_MASK(cap) & __cap_fs_set.cap[CAP_TO_INDEX(cap)]);
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}
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static inline kernel_cap_t cap_drop_fs_set(const kernel_cap_t a)
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{
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const kernel_cap_t __cap_fs_set = CAP_FS_SET;
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return cap_drop(a, __cap_fs_set);
|
|
}
|
|
|
|
static inline kernel_cap_t cap_raise_fs_set(const kernel_cap_t a,
|
|
const kernel_cap_t permitted)
|
|
{
|
|
const kernel_cap_t __cap_fs_set = CAP_FS_SET;
|
|
return cap_combine(a,
|
|
cap_intersect(permitted, __cap_fs_set));
|
|
}
|
|
|
|
static inline kernel_cap_t cap_drop_nfsd_set(const kernel_cap_t a)
|
|
{
|
|
const kernel_cap_t __cap_fs_set = CAP_NFSD_SET;
|
|
return cap_drop(a, __cap_fs_set);
|
|
}
|
|
|
|
static inline kernel_cap_t cap_raise_nfsd_set(const kernel_cap_t a,
|
|
const kernel_cap_t permitted)
|
|
{
|
|
const kernel_cap_t __cap_nfsd_set = CAP_NFSD_SET;
|
|
return cap_combine(a,
|
|
cap_intersect(permitted, __cap_nfsd_set));
|
|
}
|
|
|
|
extern const kernel_cap_t __cap_empty_set;
|
|
extern const kernel_cap_t __cap_full_set;
|
|
extern const kernel_cap_t __cap_init_eff_set;
|
|
|
|
int capable(int cap);
|
|
int __capable(struct task_struct *t, int cap);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* !_LINUX_CAPABILITY_H */
|