bsd/sys/spawn_internal.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29
  30 /*
  31  * [SPN] Support for _POSIX_SPAWN
  32  *
  33  * This file contains internal data structures which are externally represented
  34  * as opaque void pointers to prevent introspection.  This permits us to
  35  * change the underlying implementation of the code to maintain it or to
  36  * support new features, as needed, without the consumer needing to recompile
  37  * their code because of structure size changes or data reorganization.
  38  */
  39
  40 #ifndef _SYS_SPAWN_INTERNAL_H_
  41 #define _SYS_SPAWN_INTERNAL_H_
  42
  43 #include <sys/_types.h>         /* __offsetof(), __darwin_size_t */
  44 #include <sys/param.h>
  45 #include <sys/syslimits.h>      /* PATH_MAX */
  46 #include <sys/spawn.h>
  47 #include <mach/machine.h>
  48 #include <mach/port.h>
  49 #include <mach/exception_types.h>
  50 #include <mach/coalition.h>     /* COALITION_NUM_TYPES */
  51 #include <os/overflow.h>
  52
  53 /*
  54  * Safely compute the size in bytes of a structure, '_type', whose last
  55  * element, '_member', is a zero-sized array meant to hold 'x' bytes.
  56  *
  57  * If the size calculation overflows a size_t value, this macro returns 0.
  58  */
  59 #define PS_ACTION_SIZE(x, _type, _member_type) ({\
  60         size_t _ps_count = (size_t)x; \
  61         size_t _ps_size = 0; \
  62         /* (count * sizeof(_member_type)) + sizeof(_type) */ \
  63         if (os_mul_and_add_overflow(_ps_count, \
  64                                     sizeof(_member_type), \
  65                                     sizeof(_type), \
  66                                     &_ps_size)) { \
  67                 _ps_size = 0; \
  68         } \
  69         _ps_size; })
  70
  71 /*
  72  * Allowable posix_spawn() port action types
  73  */
  74 typedef enum {
  75         PSPA_SPECIAL = 0,
  76         PSPA_EXCEPTION = 1,
  77         PSPA_AU_SESSION = 2,
  78         PSPA_IMP_WATCHPORTS = 3,
  79 } pspa_t;
  80
  81 /*
  82  * Internal representation of one port to be set on posix_spawn().
  83  * Currently this is limited to setting special and exception ports,
  84  * but could be extended to other inheritable port types.
  85  */
  86 typedef struct _ps_port_action {
  87         pspa_t                  port_type;
  88         exception_mask_t        mask;
  89         mach_port_name_t        new_port;
  90         exception_behavior_t    behavior;
  91         thread_state_flavor_t   flavor;
  92         int                     which;
  93 } _ps_port_action_t;
  94
  95 /*
  96  * A collection of port actions to take on the newly spawned process.
  97  */
  98 typedef struct _posix_spawn_port_actions {
  99         int                     pspa_alloc;
 100         int                     pspa_count;
 101         _ps_port_action_t       pspa_actions[];
 102 } *_posix_spawn_port_actions_t;
 103
 104 /*
 105  * Returns size in bytes of a _posix_spawn_port_actions holding x elements.
 106  */
 107 #define PS_PORT_ACTIONS_SIZE(x) \
 108         PS_ACTION_SIZE(x, struct _posix_spawn_port_actions, _ps_port_action_t)
 109
 110 #define NBINPREFS       4
 111
 112 /*
 113  * Mapping of opaque data pointer to a MAC policy (specified by name).
 114  */
 115 typedef struct _ps_mac_policy_extension {
 116         char                    policyname[128];
 117         union {
 118                 uint64_t        data;
 119                 void            *datap;         /* pointer in kernel memory */
 120         };
 121         uint64_t                datalen;
 122 } _ps_mac_policy_extension_t;
 123
 124 /*
 125  * A collection of extra data passed to MAC policies for the newly spawned process.
 126  */
 127 typedef struct _posix_spawn_mac_policy_extensions {
 128         int                     psmx_alloc;
 129         int                     psmx_count;
 130         _ps_mac_policy_extension_t psmx_extensions[];
 131 } *_posix_spawn_mac_policy_extensions_t;
 132
 133 /*
 134  * Returns size in bytes of a _posix_spawn_mac_policy_extensions holding x elements.
 135  */
 136 #define PS_MAC_EXTENSIONS_SIZE(x)     \
 137         PS_ACTION_SIZE(x, struct _posix_spawn_mac_policy_extensions, _ps_mac_policy_extension_t)
 138
 139 #define PS_MAC_EXTENSIONS_INIT_COUNT    2
 140
 141 /*
 142  * Coalition posix spawn attributes
 143  */
 144 struct _posix_spawn_coalition_info {
 145         struct {
 146                 uint64_t psci_id;
 147                 uint32_t psci_role;
 148                 uint32_t psci_reserved1;
 149                 uint64_t psci_reserved2;
 150         } psci_info[COALITION_NUM_TYPES];
 151 };
 152
 153 /*
 154  * Persona attributes
 155  */
 156 struct _posix_spawn_persona_info {
 157         uid_t    pspi_id;       /* persona ID (unix UID) */
 158         uint32_t pspi_flags;    /* spawn persona flags */
 159         uid_t    pspi_uid;      /* alternate posix/unix UID  */
 160         gid_t    pspi_gid;      /* alternate posix/unix GID */
 161         uint32_t pspi_ngroups;  /* alternate advisory groups */
 162         gid_t    pspi_groups[NGROUPS];
 163         uid_t    pspi_gmuid;    /* group membership UID */
 164 };
 165
 166 #define POSIX_SPAWN_PERSONA_FLAGS_NONE     0x0
 167 #define POSIX_SPAWN_PERSONA_FLAGS_OVERRIDE 0x1
 168 #define POSIX_SPAWN_PERSONA_FLAGS_VERIFY   0x2
 169
 170 #define POSIX_SPAWN_PERSONA_ALL_FLAGS \
 171         (POSIX_SPAWN_PERSONA_FLAGS_OVERRIDE \
 172          | POSIX_SPAWN_PERSONA_FLAGS_VERIFY \
 173         )
 174
 175 #define POSIX_SPAWN_PERSONA_UID           0x00010000
 176 #define POSIX_SPAWN_PERSONA_GID           0x00020000
 177 #define POSIX_SPAWN_PERSONA_GROUPS        0x00040000
 178
 179
 180 /*
 181  * A posix_spawnattr structure contains all of the attribute elements that
 182  * can be set, as well as any metadata whose validity is signalled by the
 183  * presence of a bit in the flags field.  All fields are initialized to the
 184  * appropriate default values by posix_spawnattr_init().
 185  *
 186  * Fields must be added at the end of this, but before extensions array
 187  * pointers.
 188  */
 189
 190 typedef struct _posix_spawnattr {
 191         short           psa_flags;              /* spawn attribute flags */
 192         short           flags_padding;  /* get the flags to be int aligned */
 193         sigset_t        psa_sigdefault;         /* signal set to default */
 194         sigset_t        psa_sigmask;            /* signal set to mask */
 195         pid_t           psa_pgroup;             /* pgroup to spawn into */
 196         cpu_type_t      psa_binprefs[NBINPREFS];   /* cpu affinity prefs*/
 197         int             psa_pcontrol;           /* process control bits on resource starvation */
 198         int             psa_apptype;            /* app type and process spec behav */
 199         uint64_t        psa_cpumonitor_percent; /* CPU usage monitor percentage */
 200         uint64_t        psa_cpumonitor_interval; /* CPU usage monitor interval, in seconds */
 201         uint64_t        psa_reserved;
 202
 203         short       psa_jetsam_flags;           /* jetsam flags */
 204         short           short_padding;          /* Padding for alignment issues */
 205         int         psa_priority;               /* jetsam relative importance */
 206         int         psa_memlimit_active;        /* jetsam memory limit (in MB) when process is active */
 207         int         psa_memlimit_inactive;      /* jetsam memory limit (in MB) when process is inactive */
 208
 209         uint64_t        psa_qos_clamp;          /* QoS Clamp to set on the new process */
 210         uint64_t        psa_darwin_role;           /* PRIO_DARWIN_ROLE to set on the new process */
 211         int             psa_thread_limit;       /* thread limit */
 212
 213         uint64_t        psa_max_addr;           /* Max valid VM address */
 214
 215         /*
 216          * NOTE: Extensions array pointers must stay at the end so that
 217          * everything above this point stays the same size on different bitnesses
 218          * see <rdar://problem/12858307>
 219          */
 220         _posix_spawn_port_actions_t    psa_ports;  /* special/exception ports */
 221         _posix_spawn_mac_policy_extensions_t psa_mac_extensions; /* MAC policy-specific extensions. */
 222         struct _posix_spawn_coalition_info *psa_coalition_info;  /* coalition info */
 223         struct _posix_spawn_persona_info   *psa_persona_info;    /* spawn new process into given persona */
 224 } *_posix_spawnattr_t;
 225
 226 /*
 227  * Jetsam flags  eg: psa_jetsam_flags
 228  */
 229 #define POSIX_SPAWN_JETSAM_SET                      0x8000
 230
 231 #define POSIX_SPAWN_JETSAM_USE_EFFECTIVE_PRIORITY       0x01
 232 #define POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND           0x02  /* to be deprecated */
 233 #define POSIX_SPAWN_JETSAM_MEMLIMIT_FATAL               0x04  /* to be deprecated */
 234
 235 /*
 236  * Additional flags available for use with
 237  * the posix_spawnattr_setjetsam_ext() call
 238  */
 239 #define POSIX_SPAWN_JETSAM_MEMLIMIT_ACTIVE_FATAL        0x04  /* if set, limit is fatal when the process is active   */
 240 #define POSIX_SPAWN_JETSAM_MEMLIMIT_INACTIVE_FATAL      0x08  /* if set, limit is fatal when the process is inactive */
 241
 242 /*
 243  * Deprecated posix_spawn psa_flags values
 244  *
 245  * POSIX_SPAWN_OSX_TALAPP_START         0x0400
 246  * POSIX_SPAWN_IOS_RESV1_APP_START      0x0400
 247  * POSIX_SPAWN_IOS_APPLE_DAEMON_START   0x0800
 248  * POSIX_SPAWN_IOS_APP_START            0x1000
 249  * POSIX_SPAWN_OSX_WIDGET_START         0x0800
 250  * POSIX_SPAWN_OSX_DBCLIENT_START       0x0800
 251  * POSIX_SPAWN_OSX_RESVAPP_START        0x1000
 252  */
 253
 254 /*
 255  * Deprecated posix_spawn psa_apptype values
 256  *
 257  * POSIX_SPAWN_PROCESS_TYPE_APPLEDAEMON             0x00000001
 258  * POSIX_SPAWN_PROCESS_TYPE_UIAPP                   0x00000002
 259  * POSIX_SPAWN_PROCESS_TYPE_ADAPTIVE                0x00000004
 260  * POSIX_SPAWN_PROCESS_TYPE_TAL                     0x00000001
 261  * POSIX_SPAWN_PROCESS_TYPE_WIDGET                  0x00000002
 262  * POSIX_SPAWN_PROCESS_TYPE_DELAYIDLESLEEP          0x10000000
 263  *
 264  * POSIX_SPAWN_PROCESS_FLAG_IMPORTANCE_DONOR        0x00000010
 265  * POSIX_SPAWN_PROCESS_FLAG_ADAPTIVE                0x00000020
 266  * POSIX_SPAWN_PROCESS_FLAG_START_BACKGROUND        0x00000040
 267  * POSIX_SPAWN_PROCESS_FLAG_START_LIGHT_THROTTLE    0x00000080
 268  */
 269
 270 /*
 271  * posix_spawn psa_apptype process type settings.
 272  * when POSIX_SPAWN_PROC_TYPE is set, old psa_apptype bits are ignored
 273  */
 274
 275 #define POSIX_SPAWN_PROCESS_TYPE_NORMAL             0x00000000
 276 #define POSIX_SPAWN_PROCESS_TYPE_DEFAULT            POSIX_SPAWN_PROCESS_TYPE_NORMAL
 277
 278 #define POSIX_SPAWN_PROC_TYPE_MASK                  0x00000F00
 279
 280 #define POSIX_SPAWN_PROC_TYPE_APP_DEFAULT           0x00000100
 281 #define POSIX_SPAWN_PROC_TYPE_APP_TAL               0x00000200
 282
 283 #define POSIX_SPAWN_PROC_TYPE_DAEMON_STANDARD       0x00000300
 284 #define POSIX_SPAWN_PROC_TYPE_DAEMON_INTERACTIVE    0x00000400
 285 #define POSIX_SPAWN_PROC_TYPE_DAEMON_BACKGROUND     0x00000500
 286 #define POSIX_SPAWN_PROC_TYPE_DAEMON_ADAPTIVE       0x00000600
 287
 288 #define POSIX_SPAWN_PROC_CLAMP_NONE                 0x00000000
 289 #define POSIX_SPAWN_PROC_CLAMP_UTILITY              0x00000001
 290 #define POSIX_SPAWN_PROC_CLAMP_BACKGROUND           0x00000002
 291 #define POSIX_SPAWN_PROC_CLAMP_MAINTENANCE          0x00000003
 292 #define POSIX_SPAWN_PROC_CLAMP_LAST                 0x00000004
 293
 294 /* Setting to indicate no change to darwin role */
 295 #define POSIX_SPAWN_DARWIN_ROLE_NONE                0x00000000
 296 /* Other possible values are specified by PRIO_DARWIN_ROLE in sys/resource.h */
 297
 298 /*
 299  * Allowable posix_spawn() file actions
 300  */
 301 typedef enum {
 302         PSFA_OPEN = 0,
 303         PSFA_CLOSE = 1,
 304         PSFA_DUP2 = 2,
 305         PSFA_INHERIT = 3
 306 } psfa_t;
 307
 308
 309 /*
 310  * A posix_spawn() file action record for a single action
 311  *
 312  * Notes:       We carry around the full open arguments for both the open
 313  *              and the close to permit the use of a single array of action
 314  *              elements to be associated with a file actions object.
 315  *
 316  *              A possible future optimization would be to break this into
 317  *              a variable sized vector list to save space (i.e. a separate
 318  *              string area, allocation of least amount of path buffer per
 319  *              open action, etc.).
 320  *
 321  * XXX:         Currently overloading psfao_oflag for PSFA_DUP2
 322  */
 323 typedef struct _psfa_action {
 324         psfa_t  psfaa_type;                     /* file action type */
 325         int     psfaa_filedes;                  /* fd to operate on */
 326         struct _psfaa_open {
 327                 int     psfao_oflag;            /* open flags to use */
 328                 mode_t  psfao_mode;             /* mode for open */
 329                 char    psfao_path[PATH_MAX];   /* path to open */
 330         } psfaa_openargs;
 331 } _psfa_action_t;
 332
 333
 334 /*
 335  * Internal representation of posix_spawn() file actions structure
 336  *
 337  * Notes:       This is implemented as a structure followed by an array of
 338  *              file action records.  The psfa_act_alloc value is the number
 339  *              of elements allocated in this array, and the psfa_act_count is
 340  *              the number of elements currently in use (to permit some form
 341  *              of preallocation, e.g. a power of 2 growth for reallocation,
 342  *              etc.).
 343  *
 344  *              A possible future optimization would keep a size value and
 345  *              a structure base reference pointer to permit copyin to the
 346  *              kernel directly as a single blob, without damaging relative
 347  *              internal pointer math.  It's probably better that this be a
 348  *              long long rather than a true pointer, to make it invariant
 349  *              for 32 vs. 64 bt programming SPIs.
 350  */
 351 typedef struct _posix_spawn_file_actions {
 352         int             psfa_act_alloc;         /* available actions space */
 353         int             psfa_act_count;         /* count of defined actions */
 354         _psfa_action_t  psfa_act_acts[];        /* actions array (uses c99) */
 355 } *_posix_spawn_file_actions_t;
 356
 357 /*
 358  * Calculate the size of a structure, given the number of elements that it is
 359  * capable of containing.
 360  */
 361 #define PSF_ACTIONS_SIZE(x)     \
 362         PS_ACTION_SIZE(x, struct _posix_spawn_file_actions, _psfa_action_t)
 363
 364 /*
 365  * Initial count of actions in a struct _posix_spawn_file_actions after it is
 366  * first allocated; this should be non-zero, since we expect that one would not
 367  * have been allocated unless there was an intent to use it.
 368  */
 369 #define PSF_ACTIONS_INIT_COUNT  2
 370
 371 /*
 372  * Structure defining the true third argument to the posix_spawn() system call
 373  * entry point; we wrap it and pass a descriptor so that we can know the
 374  * copyin size ahead of time, and deal with copying in variant lists of things
 375  * as single monolithic units, instead of many individual elements.  This is a
 376  * performance optimization.
 377  */
 378 struct _posix_spawn_args_desc {
 379         __darwin_size_t         attr_size;      /* size of attributes block */
 380         _posix_spawnattr_t      attrp;          /* pointer to block */
 381         __darwin_size_t file_actions_size;      /* size of file actions block */
 382         _posix_spawn_file_actions_t
 383             file_actions;                       /* pointer to block */
 384         __darwin_size_t port_actions_size;      /* size of port actions block */
 385         _posix_spawn_port_actions_t
 386             port_actions;                       /* pointer to port block */
 387         __darwin_size_t mac_extensions_size;
 388         _posix_spawn_mac_policy_extensions_t
 389             mac_extensions;                     /* pointer to policy-specific
 390                                                  * attributes */
 391         __darwin_size_t coal_info_size;
 392         struct _posix_spawn_coalition_info *coal_info;  /* pointer to coalition info */
 393
 394         __darwin_size_t persona_info_size;
 395         struct _posix_spawn_persona_info   *persona_info;
 396 };
 397
 398 #ifdef KERNEL
 399 #include <sys/appleapiopts.h>
 400 #ifdef __APPLE_API_PRIVATE
 401
 402 #if __DARWIN_ALIGN_NATURAL
 403 #pragma options align=natural
 404 #endif
 405
 406 struct user32__posix_spawn_args_desc {
 407         uint32_t                attr_size;      /* size of attributes block */
 408         uint32_t                attrp;          /* pointer to block */
 409         uint32_t        file_actions_size;      /* size of file actions block */
 410         uint32_t                file_actions;   /* pointer to block */
 411         uint32_t        port_actions_size;      /* size of port actions block */
 412         uint32_t                port_actions;   /* pointer to block */
 413         uint32_t        mac_extensions_size;
 414         uint32_t        mac_extensions;
 415         uint32_t        coal_info_size;
 416         uint32_t        coal_info;
 417         uint32_t        persona_info_size;
 418         uint32_t        persona_info;
 419 };
 420
 421 struct user__posix_spawn_args_desc {
 422         user_size_t             attr_size;      /* size of attributes block */
 423         user_addr_t             attrp;          /* pointer to block */
 424         user_size_t     file_actions_size;      /* size of file actions block */
 425         user_addr_t             file_actions;   /* pointer to block */
 426         user_size_t     port_actions_size;      /* size of port actions block */
 427         user_addr_t             port_actions;   /* pointer to block */
 428         user_size_t     mac_extensions_size;    /* size of MAC-specific attrs. */
 429         user_addr_t     mac_extensions;         /* pointer to block */
 430         user_size_t     coal_info_size;
 431         user_addr_t     coal_info;
 432         user_size_t     persona_info_size;
 433         user_addr_t     persona_info;
 434 };
 435
 436
 437 #if __DARWIN_ALIGN_NATURAL
 438 #pragma options align=reset
 439 #endif
 440
 441 #endif  /* __APPLE_API_PRIVATE */
 442 #endif  /* KERNEL */
 443
 444 #endif  /* _SYS_SPAWN_INTERNAL_H_ */