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 	UNAME26	=               0x0020000,
26 	ADDR_NO_RANDOMIZE = 	0x0040000,	/* disable randomization of VA space */
27 	FDPIC_FUNCPTRS =	0x0080000,	/* userspace function ptrs point to descriptors
28 						 * (signal handling)
29 						 */
30 	MMAP_PAGE_ZERO =	0x0100000,
31 	ADDR_COMPAT_LAYOUT =	0x0200000,
32 	READ_IMPLIES_EXEC =	0x0400000,
33 	ADDR_LIMIT_32BIT =	0x0800000,
34 	SHORT_INODE =		0x1000000,
35 	WHOLE_SECONDS =		0x2000000,
36 	STICKY_TIMEOUTS	=	0x4000000,
37 	ADDR_LIMIT_3GB = 	0x8000000,
38 };
39 
40 /*
41  * Security-relevant compatibility flags that must be
42  * cleared upon setuid or setgid exec:
43  */
44 #define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC  | \
45 			    ADDR_NO_RANDOMIZE  | \
46 			    ADDR_COMPAT_LAYOUT | \
47 			    MMAP_PAGE_ZERO)
48 
49 /*
50  * Personality types.
51  *
52  * These go in the low byte.  Avoid using the top bit, it will
53  * conflict with error returns.
54  */
55 enum {
56 	PER_LINUX =		0x0000,
57 	PER_LINUX_32BIT =	0x0000 | ADDR_LIMIT_32BIT,
58 	PER_LINUX_FDPIC =	0x0000 | FDPIC_FUNCPTRS,
59 	PER_SVR4 =		0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
60 	PER_SVR3 =		0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
61 	PER_SCOSVR3 =		0x0003 | STICKY_TIMEOUTS |
62 					 WHOLE_SECONDS | SHORT_INODE,
63 	PER_OSR5 =		0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
64 	PER_WYSEV386 =		0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
65 	PER_ISCR4 =		0x0005 | STICKY_TIMEOUTS,
66 	PER_BSD =		0x0006,
67 	PER_SUNOS =		0x0006 | STICKY_TIMEOUTS,
68 	PER_XENIX =		0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
69 	PER_LINUX32 =		0x0008,
70 	PER_LINUX32_3GB =	0x0008 | ADDR_LIMIT_3GB,
71 	PER_IRIX32 =		0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
72 	PER_IRIXN32 =		0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
73 	PER_IRIX64 =		0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
74 	PER_RISCOS =		0x000c,
75 	PER_SOLARIS =		0x000d | STICKY_TIMEOUTS,
76 	PER_UW7 =		0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
77 	PER_OSF4 =		0x000f,			 /* OSF/1 v4 */
78 	PER_HPUX =		0x0010,
79 	PER_MASK =		0x00ff,
80 };
81 
82 #ifdef __KERNEL__
83 
84 /*
85  * Description of an execution domain.
86  *
87  * The first two members are refernced from assembly source
88  * and should stay where they are unless explicitly needed.
89  */
90 typedef void (*handler_t)(int, struct pt_regs *);
91 
92 struct exec_domain {
93 	const char		*name;		/* name of the execdomain */
94 	handler_t		handler;	/* handler for syscalls */
95 	unsigned char		pers_low;	/* lowest personality */
96 	unsigned char		pers_high;	/* highest personality */
97 	unsigned long		*signal_map;	/* signal mapping */
98 	unsigned long		*signal_invmap;	/* reverse signal mapping */
99 	struct map_segment	*err_map;	/* error mapping */
100 	struct map_segment	*socktype_map;	/* socket type mapping */
101 	struct map_segment	*sockopt_map;	/* socket option mapping */
102 	struct map_segment	*af_map;	/* address family mapping */
103 	struct module		*module;	/* module context of the ed. */
104 	struct exec_domain	*next;		/* linked list (internal) */
105 };
106 
107 /*
108  * Return the base personality without flags.
109  */
110 #define personality(pers)	(pers & PER_MASK)
111 
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