1#ifndef _LINUX_PERSONALITY_H
2#define _LINUX_PERSONALITY_H
3
4#ifdef __KERNEL__
5
6/*
7 * Handling of different ABIs (personalities).
8 */
9
10struct exec_domain;
11struct pt_regs;
12
13extern int		register_exec_domain(struct exec_domain *);
14extern int		unregister_exec_domain(struct exec_domain *);
15extern int		__set_personality(unsigned long);
16
17#endif /* __KERNEL__ */
18
19/*
20 * Flags for bug emulation.
21 *
22 * These occupy the top three bytes.
23 */
24enum {
25	ADDR_NO_RANDOMIZE = 	0x0040000,	/* disable randomization of VA space */
26	FDPIC_FUNCPTRS =	0x0080000,	/* userspace function ptrs point to descriptors
27						 * (signal handling)
28						 */
29	MMAP_PAGE_ZERO =	0x0100000,
30	ADDR_COMPAT_LAYOUT =	0x0200000,
31	READ_IMPLIES_EXEC =	0x0400000,
32	ADDR_LIMIT_32BIT =	0x0800000,
33	SHORT_INODE =		0x1000000,
34	WHOLE_SECONDS =		0x2000000,
35	STICKY_TIMEOUTS	=	0x4000000,
36	ADDR_LIMIT_3GB = 	0x8000000,
37};
38
39/*
40 * Security-relevant compatibility flags that must be
41 * cleared upon setuid or setgid exec:
42 */
43#define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC|ADDR_NO_RANDOMIZE)
44
45/*
46 * Personality types.
47 *
48 * These go in the low byte.  Avoid using the top bit, it will
49 * conflict with error returns.
50 */
51enum {
52	PER_LINUX =		0x0000,
53	PER_LINUX_32BIT =	0x0000 | ADDR_LIMIT_32BIT,
54	PER_LINUX_FDPIC =	0x0000 | FDPIC_FUNCPTRS,
55	PER_SVR4 =		0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
56	PER_SVR3 =		0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
57	PER_SCOSVR3 =		0x0003 | STICKY_TIMEOUTS |
58					 WHOLE_SECONDS | SHORT_INODE,
59	PER_OSR5 =		0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
60	PER_WYSEV386 =		0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
61	PER_ISCR4 =		0x0005 | STICKY_TIMEOUTS,
62	PER_BSD =		0x0006,
63	PER_SUNOS =		0x0006 | STICKY_TIMEOUTS,
64	PER_XENIX =		0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
65	PER_LINUX32 =		0x0008,
66	PER_LINUX32_3GB =	0x0008 | ADDR_LIMIT_3GB,
67	PER_IRIX32 =		0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
68	PER_IRIXN32 =		0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
69	PER_IRIX64 =		0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
70	PER_RISCOS =		0x000c,
71	PER_SOLARIS =		0x000d | STICKY_TIMEOUTS,
72	PER_UW7 =		0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
73	PER_OSF4 =		0x000f,			 /* OSF/1 v4 */
74	PER_HPUX =		0x0010,
75	PER_MASK =		0x00ff,
76};
77
78#ifdef __KERNEL__
79
80/*
81 * Description of an execution domain.
82 *
83 * The first two members are refernced from assembly source
84 * and should stay where they are unless explicitly needed.
85 */
86typedef void (*handler_t)(int, struct pt_regs *);
87
88struct exec_domain {
89	const char		*name;		/* name of the execdomain */
90	handler_t		handler;	/* handler for syscalls */
91	unsigned char		pers_low;	/* lowest personality */
92	unsigned char		pers_high;	/* highest personality */
93	unsigned long		*signal_map;	/* signal mapping */
94	unsigned long		*signal_invmap;	/* reverse signal mapping */
95	struct map_segment	*err_map;	/* error mapping */
96	struct map_segment	*socktype_map;	/* socket type mapping */
97	struct map_segment	*sockopt_map;	/* socket option mapping */
98	struct map_segment	*af_map;	/* address family mapping */
99	struct module		*module;	/* module context of the ed. */
100	struct exec_domain	*next;		/* linked list (internal) */
101};
102
103/*
104 * Return the base personality without flags.
105 */
106#define personality(pers)	(pers & PER_MASK)
107
108/*
109 * Personality of the currently running process.
110 */
111#define get_personality		(current->personality)
112
113/*
114 * Change personality of the currently running process.
115 */
116#define set_personality(pers) \
117	((current->personality == (pers)) ? 0 : __set_personality(pers))
118
119#endif /* __KERNEL__ */
120
121#endif /* _LINUX_PERSONALITY_H */
122