LXR linux/include/linux/personality.h

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