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
  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 */