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Add 64-bit capability support to the kernel

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The patch supports legacy (32-bit) capability userspace, and where possible
translates 32-bit capabilities to/from userspace and the VFS to 64-bit
kernel space capabilities.  If a capability set cannot be compressed into
32-bits for consumption by user space, the system call fails, with -ERANGE.

FWIW libcap-2.00 supports this change (and earlier capability formats)

 http://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/

[akpm@linux-foundation.org: coding-syle fixes]
[akpm@linux-foundation.org: use get_task_comm()]
[ezk@cs.sunysb.edu: build fix]
[akpm@linux-foundation.org: do not initialise statics to 0 or NULL]
[akpm@linux-foundation.org: unused var]
[serue@us.ibm.com: export __cap_ symbols]
Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: James Morris <jmorris@namei.org>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morgan 2008-02-04 22:29:42 -08:00 • committed by Linus Torvalds
parent 8f6936f4d2
commit e338d263a7
7 changed files with 349 additions and 125 deletions
Download patch file Download diff file Expand all files Collapse all files

221
include/linux/capability.h
View file

@ -23,13 +23,20 @@ struct task_struct;
kernel might be somewhat backwards compatible, but don't bet on
it. */
/* XXX - Note, cap_t, is defined by POSIX to be an "opaque" pointer to
/* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
a set of three capability sets. The transposition of 3*the
following structure to such a composite is better handled in a user
library since the draft standard requires the use of malloc/free
etc.. */
#define _LINUX_CAPABILITY_VERSION 0x19980330
#define _LINUX_CAPABILITY_VERSION_1 0x19980330
#define _LINUX_CAPABILITY_U32S_1 1
#define _LINUX_CAPABILITY_VERSION_2 0x20071026
#define _LINUX_CAPABILITY_U32S_2 2
#define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_2
#define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_2
typedef struct __user_cap_header_struct {
__u32 version;
@ -42,43 +49,42 @@ typedef struct __user_cap_data_struct {
__u32 inheritable;
} __user *cap_user_data_t;
#define XATTR_CAPS_SUFFIX "capability"
#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
#define XATTR_CAPS_SZ (3*sizeof(__le32))
#define VFS_CAP_REVISION_MASK 0xFF000000
#define VFS_CAP_REVISION_1 0x01000000
#define VFS_CAP_REVISION VFS_CAP_REVISION_1
#define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
#define VFS_CAP_FLAGS_EFFECTIVE 0x000001
#define VFS_CAP_REVISION_1 0x01000000
#define VFS_CAP_U32_1 1
#define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))
#define VFS_CAP_REVISION_2 0x02000000
#define VFS_CAP_U32_2 2
#define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))
#define XATTR_CAPS_SZ XATTR_CAPS_SZ_2
#define VFS_CAP_U32 VFS_CAP_U32_2
#define VFS_CAP_REVISION VFS_CAP_REVISION_2
struct vfs_cap_data {
__u32 magic_etc; /* Little endian */
__le32 magic_etc; /* Little endian */
struct {
__u32 permitted; /* Little endian */
__u32 inheritable; /* Little endian */
} data[1];
__le32 permitted; /* Little endian */
__le32 inheritable; /* Little endian */
} data[VFS_CAP_U32];
};
#ifdef __KERNEL__
/* #define STRICT_CAP_T_TYPECHECKS */
#ifdef STRICT_CAP_T_TYPECHECKS
typedef struct kernel_cap_struct {
__u32 cap;
__u32 cap[_LINUX_CAPABILITY_U32S];
} kernel_cap_t;
#else
typedef __u32 kernel_cap_t;
#endif
#define _USER_CAP_HEADER_SIZE (2*sizeof(__u32))
#define _USER_CAP_HEADER_SIZE (sizeof(struct __user_cap_header_struct))
#define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
#endif
@ -121,10 +127,6 @@ typedef __u32 kernel_cap_t;
#define CAP_FSETID 4
/* Used to decide between falling back on the old suser() or fsuser(). */
#define CAP_FS_MASK 0x1f
/* 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. */
@ -147,8 +149,12 @@ typedef __u32 kernel_cap_t;
** Linux-specific capabilities
**/
/* Transfer any capability in your permitted set to any pid,
remove any capability in your permitted set from any pid */
/* 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 to the current process' inheritable set
*/
#define CAP_SETPCAP 8
@ -309,70 +315,153 @@ typedef __u32 kernel_cap_t;
#define CAP_SETFCAP 31
/*
* Bit location of each capability (used by user-space library and kernel)
*/
#define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */
#define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */
#ifdef __KERNEL__
/*
* Internal kernel functions only
*/
#ifdef STRICT_CAP_T_TYPECHECKS
#define CAP_FOR_EACH_U32(__capi) \
for (__capi = 0; __capi < _LINUX_CAPABILITY_U32S; ++__capi)
#define to_cap_t(x) { x }
#define cap_t(x) (x).cap
# define CAP_FS_MASK_B0 (CAP_TO_MASK(CAP_CHOWN) \
| CAP_TO_MASK(CAP_DAC_OVERRIDE) \
| CAP_TO_MASK(CAP_DAC_READ_SEARCH) \
| CAP_TO_MASK(CAP_FOWNER) \
| CAP_TO_MASK(CAP_FSETID))
#else
#if _LINUX_CAPABILITY_U32S != 2
# error Fix up hand-coded capability macro initializers
#else /* HAND-CODED capability initializers */
#define to_cap_t(x) (x)
#define cap_t(x) (x)
# define CAP_EMPTY_SET {{ 0, 0 }}
# define CAP_FULL_SET {{ ~0, ~0 }}
# define CAP_INIT_EFF_SET {{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }}
# define CAP_FS_SET {{ CAP_FS_MASK_B0, 0 }}
# define CAP_NFSD_SET {{ CAP_FS_MASK_B0|CAP_TO_MASK(CAP_SYS_RESOURCE), 0 }}
#endif
#endif /* _LINUX_CAPABILITY_U32S != 2 */
#define CAP_EMPTY_SET to_cap_t(0)
#define CAP_FULL_SET to_cap_t(~0)
#define CAP_INIT_EFF_SET to_cap_t(~0 & ~CAP_TO_MASK(CAP_SETPCAP))
#define CAP_INIT_INH_SET to_cap_t(0)
#define CAP_INIT_INH_SET CAP_EMPTY_SET
#define CAP_TO_MASK(x) (1 << (x))
#define cap_raise(c, flag) (cap_t(c) |= CAP_TO_MASK(flag))
#define cap_lower(c, flag) (cap_t(c) &= ~CAP_TO_MASK(flag))
#define cap_raised(c, flag) (cap_t(c) & CAP_TO_MASK(flag))
# define cap_clear(c) do { (c) = __cap_empty_set; } while (0)
# define cap_set_full(c) do { (c) = __cap_full_set; } while (0)
# define cap_set_init_eff(c) do { (c) = __cap_init_eff_set; } while (0)
static inline kernel_cap_t cap_combine(kernel_cap_t a, kernel_cap_t b)
#define cap_raise(c, flag) ((c).cap[CAP_TO_INDEX(flag)] |= CAP_TO_MASK(flag))
#define cap_lower(c, flag) ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))
#define cap_raised(c, flag) ((c).cap[CAP_TO_INDEX(flag)] & CAP_TO_MASK(flag))
#define CAP_BOP_ALL(c, a, b, OP) \
do { \
unsigned __capi; \
CAP_FOR_EACH_U32(__capi) { \
c.cap[__capi] = a.cap[__capi] OP b.cap[__capi]; \
} \
} while (0)
#define CAP_UOP_ALL(c, a, OP) \
do { \
unsigned __capi; \
CAP_FOR_EACH_U32(__capi) { \
c.cap[__capi] = OP a.cap[__capi]; \
} \
} while (0)
static inline kernel_cap_t cap_combine(const kernel_cap_t a,
const kernel_cap_t b)
{
kernel_cap_t dest;
cap_t(dest) = cap_t(a) | cap_t(b);
return dest;
kernel_cap_t dest;
CAP_BOP_ALL(dest, a, b, |);
return dest;
}
static inline kernel_cap_t cap_intersect(kernel_cap_t a, kernel_cap_t b)
static inline kernel_cap_t cap_intersect(const kernel_cap_t a,
const kernel_cap_t b)
{
kernel_cap_t dest;
cap_t(dest) = cap_t(a) & cap_t(b);
return dest;
kernel_cap_t dest;
CAP_BOP_ALL(dest, a, b, &);
return dest;
}
static inline kernel_cap_t cap_drop(kernel_cap_t a, kernel_cap_t drop)
static inline kernel_cap_t cap_drop(const kernel_cap_t a,
const kernel_cap_t drop)
{
kernel_cap_t dest;
cap_t(dest) = cap_t(a) & ~cap_t(drop);
return dest;
kernel_cap_t dest;
CAP_BOP_ALL(dest, a, drop, &~);
return dest;
}
static inline kernel_cap_t cap_invert(kernel_cap_t c)
static inline kernel_cap_t cap_invert(const kernel_cap_t c)
{
kernel_cap_t dest;
cap_t(dest) = ~cap_t(c);
return dest;
kernel_cap_t dest;
CAP_UOP_ALL(dest, c, ~);
return dest;
}
#define cap_isclear(c) (!cap_t(c))
#define cap_issubset(a,set) (!(cap_t(a) & ~cap_t(set)))
static inline int cap_isclear(const kernel_cap_t a)
{
unsigned __capi;
CAP_FOR_EACH_U32(__capi) {
if (a.cap[__capi] != 0)
return 0;
}
return 1;
}
#define cap_clear(c) do { cap_t(c) = 0; } while(0)
#define cap_set_full(c) do { cap_t(c) = ~0; } while(0)
#define cap_mask(c,mask) do { cap_t(c) &= cap_t(mask); } while(0)
static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
{
kernel_cap_t dest;
dest = cap_drop(a, set);
return cap_isclear(dest);
}
#define cap_is_fs_cap(c) (CAP_TO_MASK(c) & CAP_FS_MASK)
/* Used to decide between falling back on the old suser() or fsuser(). */
static inline int cap_is_fs_cap(int cap)
{
const kernel_cap_t __cap_fs_set = CAP_FS_SET;
return !!(CAP_TO_MASK(cap) & __cap_fs_set.cap[CAP_TO_INDEX(cap)]);
}
static inline kernel_cap_t cap_drop_fs_set(const kernel_cap_t a)
{
const kernel_cap_t __cap_fs_set = CAP_FS_SET;
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);