1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #ifndef _SYS_SYSENT_H_ 35 #define _SYS_SYSENT_H_ 36 37 #include <bsm/audit.h> 38 39 struct rlimit; 40 struct sysent; 41 struct thread; 42 struct ksiginfo; 43 struct syscall_args; 44 45 enum systrace_probe_t { 46 SYSTRACE_ENTRY, 47 SYSTRACE_RETURN, 48 }; 49 50 typedef int sy_call_t(struct thread *, void *); 51 52 typedef void (*systrace_probe_func_t)(struct syscall_args *, 53 enum systrace_probe_t, int); 54 typedef void (*systrace_args_func_t)(int, void *, uint64_t *, int *); 55 56 #ifdef _KERNEL 57 extern systrace_probe_func_t systrace_probe_func; 58 extern bool systrace_enabled; 59 60 #ifdef KDTRACE_HOOKS 61 #define SYSTRACE_ENABLED() (systrace_enabled) 62 #else 63 #define SYSTRACE_ENABLED() (0) 64 #endif 65 #endif /* _KERNEL */ 66 67 struct sysent { /* system call table */ 68 sy_call_t *sy_call; /* implementing function */ 69 systrace_args_func_t sy_systrace_args_func; 70 /* optional argument conversion function. */ 71 u_int8_t sy_narg; /* number of arguments */ 72 u_int8_t sy_flags; /* General flags for system calls. */ 73 au_event_t sy_auevent; /* audit event associated with syscall */ 74 u_int32_t sy_entry; /* DTrace entry ID for systrace. */ 75 u_int32_t sy_return; /* DTrace return ID for systrace. */ 76 u_int32_t sy_thrcnt; 77 }; 78 79 /* 80 * A system call is permitted in capability mode. 81 */ 82 #define SYF_CAPENABLED 0x00000001 83 84 #define SY_THR_FLAGMASK 0x7 85 #define SY_THR_STATIC 0x1 86 #define SY_THR_DRAINING 0x2 87 #define SY_THR_ABSENT 0x4 88 #define SY_THR_INCR 0x8 89 90 #ifdef KLD_MODULE 91 #define SY_THR_STATIC_KLD 0 92 #else 93 #define SY_THR_STATIC_KLD SY_THR_STATIC 94 #endif 95 96 struct image_params; 97 struct proc; 98 struct __sigset; 99 struct trapframe; 100 struct vnode; 101 102 struct sysentvec { 103 int sv_size; /* number of entries */ 104 struct sysent *sv_table; /* pointer to sysent */ 105 int (*sv_transtrap)(int, int); 106 /* translate trap-to-signal mapping */ 107 int (*sv_fixup)(uintptr_t *, struct image_params *); 108 /* stack fixup function */ 109 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *); 110 /* send signal */ 111 const char *sv_sigcode; /* start of sigtramp code */ 112 int *sv_szsigcode; /* size of sigtramp code */ 113 int sv_sigcodeoff; 114 char *sv_name; /* name of binary type */ 115 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int); 116 /* function to dump core, or NULL */ 117 int (*sv_imgact_try)(struct image_params *); 118 int (*sv_copyout_auxargs)(struct image_params *, 119 uintptr_t); 120 int sv_minsigstksz; /* minimum signal stack size */ 121 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 122 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 123 vm_offset_t sv_usrstack; /* USRSTACK */ 124 vm_offset_t sv_psstrings; /* PS_STRINGS */ 125 size_t sv_psstringssz; /* PS_STRINGS size */ 126 int sv_stackprot; /* vm protection for stack */ 127 int (*sv_copyout_strings)(struct image_params *, 128 uintptr_t *); 129 void (*sv_setregs)(struct thread *, struct image_params *, 130 uintptr_t); 131 void (*sv_fixlimit)(struct rlimit *, int); 132 u_long *sv_maxssiz; 133 u_int sv_flags; 134 void (*sv_set_syscall_retval)(struct thread *, int); 135 int (*sv_fetch_syscall_args)(struct thread *); 136 const char **sv_syscallnames; 137 vm_offset_t sv_timekeep_base; 138 vm_offset_t sv_shared_page_base; 139 vm_offset_t sv_shared_page_len; 140 vm_offset_t sv_sigcode_base; 141 void *sv_shared_page_obj; 142 vm_offset_t sv_vdso_base; 143 void (*sv_schedtail)(struct thread *); 144 void (*sv_thread_detach)(struct thread *); 145 int (*sv_trap)(struct thread *); 146 u_long *sv_hwcap; /* Value passed in AT_HWCAP. */ 147 u_long *sv_hwcap2; /* Value passed in AT_HWCAP2. */ 148 const char *(*sv_machine_arch)(struct proc *); 149 vm_offset_t sv_fxrng_gen_base; 150 void (*sv_onexec_old)(struct thread *td); 151 void (*sv_onexec)(struct proc *, struct image_params *); 152 void (*sv_onexit)(struct proc *); 153 void (*sv_ontdexit)(struct thread *td); 154 int (*sv_setid_allowed)(struct thread *td, 155 struct image_params *imgp); 156 }; 157 158 #define SV_ILP32 0x000100 /* 32-bit executable. */ 159 #define SV_LP64 0x000200 /* 64-bit executable. */ 160 #define SV_IA32 0x004000 /* Intel 32-bit executable. */ 161 #define SV_AOUT 0x008000 /* a.out executable. */ 162 #define SV_SHP 0x010000 /* Shared page. */ 163 #define SV_CAPSICUM 0x020000 /* Force cap_enter() on startup. */ 164 #define SV_TIMEKEEP 0x040000 /* Shared page timehands. */ 165 #define SV_ASLR 0x080000 /* ASLR allowed. */ 166 #define SV_RNG_SEED_VER 0x100000 /* random(4) reseed generation. */ 167 #define SV_SIG_DISCIGN 0x200000 /* Do not discard ignored signals */ 168 #define SV_SIG_WAITNDQ 0x400000 /* Wait does not dequeue SIGCHLD */ 169 #define SV_DSO_SIG 0x800000 /* Signal trampoline packed in dso */ 170 171 #define SV_ABI_MASK 0xff 172 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) 173 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK) 174 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x) 175 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc) 176 /* same as ELFOSABI_XXX, to prevent header pollution */ 177 #define SV_ABI_LINUX 3 178 #define SV_ABI_FREEBSD 9 179 #define SV_ABI_CLOUDABI 17 180 #define SV_ABI_UNDEF 255 181 182 /* sv_coredump flags */ 183 #define SVC_PT_COREDUMP 0x00000001 /* dump requested by ptrace(2) */ 184 #define SVC_NOCOMPRESS 0x00000002 /* disable compression. */ 185 #define SVC_ALL 0x00000004 /* dump everything */ 186 187 #ifdef _KERNEL 188 extern struct sysentvec aout_sysvec; 189 extern struct sysent sysent[]; 190 extern const char *syscallnames[]; 191 192 #define NO_SYSCALL (-1) 193 194 struct module; 195 196 struct syscall_module_data { 197 int (*chainevh)(struct module *, int, void *); /* next handler */ 198 void *chainarg; /* arg for next event handler */ 199 int *offset; /* offset into sysent */ 200 struct sysent *new_sysent; /* new sysent */ 201 struct sysent old_sysent; /* old sysent */ 202 int flags; /* flags for syscall_register */ 203 }; 204 205 /* separate initialization vector so it can be used in a substructure */ 206 #define SYSENT_INIT_VALS(_syscallname) { \ 207 .sy_narg = (sizeof(struct _syscallname ## _args ) \ 208 / sizeof(register_t)), \ 209 .sy_call = (sy_call_t *)&sys_##_syscallname, \ 210 .sy_auevent = SYS_AUE_##_syscallname, \ 211 .sy_systrace_args_func = NULL, \ 212 .sy_entry = 0, \ 213 .sy_return = 0, \ 214 .sy_flags = 0, \ 215 .sy_thrcnt = 0 \ 216 } 217 218 #define MAKE_SYSENT(syscallname) \ 219 static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname); 220 221 #define MAKE_SYSENT_COMPAT(syscallname) \ 222 static struct sysent syscallname##_sysent = { \ 223 (sizeof(struct syscallname ## _args ) \ 224 / sizeof(register_t)), \ 225 (sy_call_t *)& syscallname, \ 226 SYS_AUE_##syscallname \ 227 } 228 229 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 230 static struct syscall_module_data name##_syscall_mod = { \ 231 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 232 }; \ 233 \ 234 static moduledata_t name##_mod = { \ 235 "sys/" #name, \ 236 syscall_module_handler, \ 237 &name##_syscall_mod \ 238 }; \ 239 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 240 241 #define SYSCALL_MODULE_HELPER(syscallname) \ 242 static int syscallname##_syscall = SYS_##syscallname; \ 243 MAKE_SYSENT(syscallname); \ 244 SYSCALL_MODULE(syscallname, \ 245 & syscallname##_syscall, & syscallname##_sysent, \ 246 NULL, NULL) 247 248 #define SYSCALL_MODULE_PRESENT(syscallname) \ 249 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ 250 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) 251 252 /* 253 * Syscall registration helpers with resource allocation handling. 254 */ 255 struct syscall_helper_data { 256 struct sysent new_sysent; 257 struct sysent old_sysent; 258 int syscall_no; 259 int registered; 260 }; 261 #define SYSCALL_INIT_HELPER_F(syscallname, flags) { \ 262 .new_sysent = { \ 263 .sy_narg = (sizeof(struct syscallname ## _args ) \ 264 / sizeof(register_t)), \ 265 .sy_call = (sy_call_t *)& sys_ ## syscallname, \ 266 .sy_auevent = SYS_AUE_##syscallname, \ 267 .sy_flags = (flags) \ 268 }, \ 269 .syscall_no = SYS_##syscallname \ 270 } 271 #define SYSCALL_INIT_HELPER_COMPAT_F(syscallname, flags) { \ 272 .new_sysent = { \ 273 .sy_narg = (sizeof(struct syscallname ## _args ) \ 274 / sizeof(register_t)), \ 275 .sy_call = (sy_call_t *)& syscallname, \ 276 .sy_auevent = SYS_AUE_##syscallname, \ 277 .sy_flags = (flags) \ 278 }, \ 279 .syscall_no = SYS_##syscallname \ 280 } 281 #define SYSCALL_INIT_HELPER(syscallname) \ 282 SYSCALL_INIT_HELPER_F(syscallname, 0) 283 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) \ 284 SYSCALL_INIT_HELPER_COMPAT_F(syscallname, 0) 285 #define SYSCALL_INIT_LAST { \ 286 .syscall_no = NO_SYSCALL \ 287 } 288 289 int syscall_module_handler(struct module *mod, int what, void *arg); 290 int syscall_helper_register(struct syscall_helper_data *sd, int flags); 291 int syscall_helper_unregister(struct syscall_helper_data *sd); 292 /* Implementation, exposed for COMPAT code */ 293 int kern_syscall_register(struct sysent *sysents, int *offset, 294 struct sysent *new_sysent, struct sysent *old_sysent, int flags); 295 int kern_syscall_deregister(struct sysent *sysents, int offset, 296 const struct sysent *old_sysent); 297 int kern_syscall_module_handler(struct sysent *sysents, 298 struct module *mod, int what, void *arg); 299 int kern_syscall_helper_register(struct sysent *sysents, 300 struct syscall_helper_data *sd, int flags); 301 int kern_syscall_helper_unregister(struct sysent *sysents, 302 struct syscall_helper_data *sd); 303 304 struct proc; 305 const char *syscallname(struct proc *p, u_int code); 306 307 /* Special purpose system call functions. */ 308 struct nosys_args; 309 310 int lkmnosys(struct thread *, struct nosys_args *); 311 int lkmressys(struct thread *, struct nosys_args *); 312 313 int syscall_thread_enter(struct thread *td, struct sysent *se); 314 void syscall_thread_exit(struct thread *td, struct sysent *se); 315 316 int shared_page_alloc(int size, int align); 317 int shared_page_fill(int size, int align, const void *data); 318 void shared_page_write(int base, int size, const void *data); 319 void exec_sysvec_init(void *param); 320 void exec_sysvec_init_secondary(struct sysentvec *sv, struct sysentvec *sv2); 321 void exec_inittk(void); 322 323 void exit_onexit(struct proc *p); 324 void exec_free_abi_mappings(struct proc *p); 325 void exec_onexec_old(struct thread *td); 326 327 #define INIT_SYSENTVEC(name, sv) \ 328 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \ 329 (sysinit_cfunc_t)exec_sysvec_init, sv); 330 331 #endif /* _KERNEL */ 332 333 #endif /* !_SYS_SYSENT_H_ */ 334