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