1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1993, David Greenman 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 AUTHOR 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_IMGACT_H_ 35 #define _SYS_IMGACT_H_ 36 37 #include <sys/_uio.h> 38 39 #include <vm/vm.h> 40 41 #define MAXSHELLCMDLEN PAGE_SIZE 42 43 struct ucred; 44 45 struct image_args { 46 char *buf; /* pointer to string buffer */ 47 void *bufkva; /* cookie for string buffer KVA */ 48 char *begin_argv; /* beginning of argv in buf */ 49 char *begin_envv; /* (interal use only) beginning of envv in buf, 50 * access with exec_args_get_begin_envv(). */ 51 char *endp; /* current `end' pointer of arg & env strings */ 52 char *fname; /* pointer to filename of executable (system space) */ 53 char *fname_buf; /* pointer to optional malloc(M_TEMP) buffer */ 54 int stringspace; /* space left in arg & env buffer */ 55 int argc; /* count of argument strings */ 56 int envc; /* count of environment strings */ 57 int fd; /* file descriptor of the executable */ 58 }; 59 60 struct image_params { 61 struct proc *proc; /* our process */ 62 struct label *execlabel; /* optional exec label */ 63 struct vnode *vp; /* pointer to vnode of file to exec */ 64 struct vm_object *object; /* The vm object for this vp */ 65 struct vattr *attr; /* attributes of file */ 66 const char *image_header; /* header of file to exec */ 67 unsigned long entry_addr; /* entry address of target executable */ 68 unsigned long reloc_base; /* load address of image */ 69 char *interpreter_name; /* name of the interpreter */ 70 void *auxargs; /* ELF Auxinfo structure pointer */ 71 struct sf_buf *firstpage; /* first page that we mapped */ 72 void *ps_strings; /* pointer to ps_string (user space) */ 73 struct image_args *args; /* system call arguments */ 74 struct sysentvec *sysent; /* system entry vector */ 75 void *argv; /* pointer to argv (user space) */ 76 void *envv; /* pointer to envv (user space) */ 77 char *execpath; 78 void *execpathp; 79 char *freepath; 80 void *canary; 81 int canarylen; 82 void *pagesizes; 83 int pagesizeslen; 84 vm_prot_t stack_prot; 85 u_long stack_sz; 86 struct ucred *newcred; /* new credentials if changing */ 87 #define IMGACT_SHELL 0x1 88 #define IMGACT_BINMISC 0x2 89 unsigned char interpreted; /* mask of interpreters that have run */ 90 bool credential_setid; /* true if becoming setid */ 91 bool vmspace_destroyed; /* we've blown away original vm space */ 92 bool opened; /* we have opened executable vnode */ 93 bool textset; 94 u_int map_flags; 95 #define IMGP_ASLR_SHARED_PAGE 0x1 96 uint32_t imgp_flags; 97 struct vnode *interpreter_vp; /* vnode of the interpreter */ 98 }; 99 100 #ifdef _KERNEL 101 struct sysentvec; 102 struct thread; 103 struct vmspace; 104 105 int exec_alloc_args(struct image_args *); 106 int exec_args_add_arg(struct image_args *args, const char *argp, 107 enum uio_seg segflg); 108 int exec_args_add_env(struct image_args *args, const char *envp, 109 enum uio_seg segflg); 110 int exec_args_add_fname(struct image_args *args, const char *fname, 111 enum uio_seg segflg); 112 int exec_args_adjust_args(struct image_args *args, size_t consume, 113 ssize_t extend); 114 char *exec_args_get_begin_envv(struct image_args *args); 115 int exec_check_permissions(struct image_params *); 116 void exec_cleanup(struct thread *td, struct vmspace *); 117 int exec_copyout_strings(struct image_params *, uintptr_t *); 118 void exec_free_args(struct image_args *); 119 int exec_map_stack(struct image_params *); 120 int exec_new_vmspace(struct image_params *, struct sysentvec *); 121 void exec_setregs(struct thread *, struct image_params *, uintptr_t); 122 int exec_shell_imgact(struct image_params *); 123 int exec_copyin_args(struct image_args *, const char *, enum uio_seg, 124 char **, char **); 125 int pre_execve(struct thread *td, struct vmspace **oldvmspace); 126 void post_execve(struct thread *td, int error, struct vmspace *oldvmspace); 127 #endif 128 129 #endif /* !_SYS_IMGACT_H_ */ 130