root/include/linux/personality.h

INCLUDED FROM

#ifndef _LINUX_PERSONALITY_H
#define _LINUX_PERSONALITY_H

#ifdef __KERNEL__

/*
 * Handling of different ABIs (personalities).
 */

struct exec_domain;
struct pt_regs;

extern int              register_exec_domain(struct exec_domain *);
extern int              unregister_exec_domain(struct exec_domain *);
extern int              __set_personality(unsigned long);

#endif /* __KERNEL__ */

/*
 * Flags for bug emulation.
 *
 * These occupy the top three bytes.
 */
enum {
        ADDR_NO_RANDOMIZE =     0x0040000,      /* disable randomization of VA space */
        FDPIC_FUNCPTRS =        0x0080000,      /* userspace function ptrs point to descriptors
                                                 * (signal handling)
                                                 */
        MMAP_PAGE_ZERO =        0x0100000,
        ADDR_COMPAT_LAYOUT =    0x0200000,
        READ_IMPLIES_EXEC =     0x0400000,
        ADDR_LIMIT_32BIT =      0x0800000,
        SHORT_INODE =           0x1000000,
        WHOLE_SECONDS =         0x2000000,
        STICKY_TIMEOUTS =       0x4000000,
        ADDR_LIMIT_3GB =        0x8000000,
};

/*
 * Security-relevant compatibility flags that must be
 * cleared upon setuid or setgid exec:
 */
#define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC|ADDR_NO_RANDOMIZE)

/*
 * Personality types.
 *
 * These go in the low byte.  Avoid using the top bit, it will
 * conflict with error returns.
 */
enum {
        PER_LINUX =             0x0000,
        PER_LINUX_32BIT =       0x0000 | ADDR_LIMIT_32BIT,
        PER_LINUX_FDPIC =       0x0000 | FDPIC_FUNCPTRS,
        PER_SVR4 =              0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
        PER_SVR3 =              0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
        PER_SCOSVR3 =           0x0003 | STICKY_TIMEOUTS |
                                         WHOLE_SECONDS | SHORT_INODE,
        PER_OSR5 =              0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
        PER_WYSEV386 =          0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
        PER_ISCR4 =             0x0005 | STICKY_TIMEOUTS,
        PER_BSD =               0x0006,
        PER_SUNOS =             0x0006 | STICKY_TIMEOUTS,
        PER_XENIX =             0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
        PER_LINUX32 =           0x0008,
        PER_LINUX32_3GB =       0x0008 | ADDR_LIMIT_3GB,
        PER_IRIX32 =            0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
        PER_IRIXN32 =           0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
        PER_IRIX64 =            0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
        PER_RISCOS =            0x000c,
        PER_SOLARIS =           0x000d | STICKY_TIMEOUTS,
        PER_UW7 =               0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
        PER_OSF4 =              0x000f,                  /* OSF/1 v4 */
        PER_HPUX =              0x0010,
        PER_MASK =              0x00ff,
};

#ifdef __KERNEL__

/*
 * Description of an execution domain.
 * 
 * The first two members are refernced from assembly source
 * and should stay where they are unless explicitly needed.
 */
typedef void (*handler_t)(int, struct pt_regs *);

struct exec_domain {
        const char              *name;          /* name of the execdomain */
        handler_t               handler;        /* handler for syscalls */
        unsigned char           pers_low;       /* lowest personality */
        unsigned char           pers_high;      /* highest personality */
        unsigned long           *signal_map;    /* signal mapping */
        unsigned long           *signal_invmap; /* reverse signal mapping */
        struct map_segment      *err_map;       /* error mapping */
        struct map_segment      *socktype_map;  /* socket type mapping */
        struct map_segment      *sockopt_map;   /* socket option mapping */
        struct map_segment      *af_map;        /* address family mapping */
        struct module           *module;        /* module context of the ed. */
        struct exec_domain      *next;          /* linked list (internal) */
};

/*
 * Return the base personality without flags.
 */
#define personality(pers)       (pers & PER_MASK)


/*
 * Change personality of the currently running process.
 */
#define set_personality(pers) \
        ((current->personality == (pers)) ? 0 : __set_personality(pers))

#endif /* __KERNEL__ */

#endif /* _LINUX_PERSONALITY_H */