LXR linux/include/linux/personality.h

   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  | \
  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 */
  54enum {
  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 */
  89typedef void (*handler_t)(int, struct pt_regs *);
  90
  91struct 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