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