include/linux/personality.h

   1 #ifndef _LINUX_PERSONALITY_H
   2 #define _LINUX_PERSONALITY_H
   3
   4 /*
   5  * Handling of different ABIs (personalities).
   6  */
   7
   8 struct exec_domain;
   9 struct pt_regs;
  10
  11 extern int              register_exec_domain(struct exec_domain *);
  12 extern int              unregister_exec_domain(struct exec_domain *);
  13 extern int              __set_personality(unsigned long);
  14
  15 /*
  16  * Flags for bug emulation.
  17  *
  18  * These occupy the top three bytes.
  19  */
  20 enum {
  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  */
  46 enum {
  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  */
  80 typedef void (*handler_t)(int, struct pt_regs *);
  81
  82 struct 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 */