linux/include/linux/personality.h
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   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 int);
  16
  17#endif /* __KERNEL__ */
  18
  19/*
  20 * Flags for bug emulation.
  21 *
  22 * These occupy the top three bytes.
  23 */
  24enum {
  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 */
  55enum {
  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 */
  90typedef void (*handler_t)(int, struct pt_regs *);
  91
  92struct 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
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