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 32 #ifndef _SYS_IMGACT_H_ 33 #define _SYS_IMGACT_H_ 34 35 #include <sys/_uio.h> 36 37 #include <vm/vm.h> 38 39 #define MAXSHELLCMDLEN PAGE_SIZE 40 41 struct ucred; 42 43 struct image_args { 44 char *buf; /* pointer to string buffer */ 45 void *bufkva; /* cookie for string buffer KVA */ 46 char *begin_argv; /* beginning of argv in buf */ 47 char *begin_envv; /* (interal use only) beginning of envv in buf, 48 * access with exec_args_get_begin_envv(). */ 49 char *endp; /* current `end' pointer of arg & env strings */ 50 char *fname; /* pointer to filename of executable (system space) */ 51 char *fname_buf; /* pointer to optional malloc(M_TEMP) buffer */ 52 int stringspace; /* space left in arg & env buffer */ 53 int argc; /* count of argument strings */ 54 int envc; /* count of environment strings */ 55 int fd; /* file descriptor of the executable */ 56 }; 57 58 struct image_params { 59 struct proc *proc; /* our process */ 60 struct label *execlabel; /* optional exec label */ 61 struct vnode *vp; /* pointer to vnode of file to exec */ 62 struct vm_object *object; /* The vm object for this vp */ 63 struct vattr *attr; /* attributes of file */ 64 const char *image_header; /* header of file to exec */ 65 unsigned long entry_addr; /* entry address of target executable */ 66 unsigned long reloc_base; /* load address of image */ 67 unsigned long et_dyn_addr; /* PIE load base */ 68 char *interpreter_name; /* name of the interpreter */ 69 void *auxargs; /* ELF Auxinfo structure pointer */ 70 struct sf_buf *firstpage; /* first page that we mapped */ 71 void *ps_strings; /* pointer to ps_string (user space) */ 72 struct image_args *args; /* system call arguments */ 73 struct sysentvec *sysent; /* system entry vector */ 74 void *argv; /* pointer to argv (user space) */ 75 void *envv; /* pointer to envv (user space) */ 76 char *execpath; 77 void *execpathp; 78 char *freepath; 79 void *canary; 80 int canarylen; 81 void *pagesizes; 82 int pagesizeslen; 83 vm_prot_t stack_prot; 84 u_long stack_sz; 85 struct ucred *newcred; /* new credentials if changing */ 86 #define IMGACT_SHELL 0x1 87 #define IMGACT_BINMISC 0x2 88 unsigned char interpreted; /* mask of interpreters that have run */ 89 bool credential_setid; /* true if becoming setid */ 90 bool vmspace_destroyed; /* we've blown away original vm space */ 91 bool opened; /* we have opened executable vnode */ 92 bool textset; 93 u_int map_flags; 94 #define IMGP_ASLR_SHARED_PAGE 0x1 95 uint32_t imgp_flags; 96 struct vnode *interpreter_vp; /* vnode of the interpreter */ 97 }; 98 99 #ifdef _KERNEL 100 struct sysentvec; 101 struct thread; 102 struct vmspace; 103 104 int exec_alloc_args(struct image_args *); 105 int exec_args_add_arg(struct image_args *args, const char *argp, 106 enum uio_seg segflg); 107 int exec_args_add_env(struct image_args *args, const char *envp, 108 enum uio_seg segflg); 109 int exec_args_add_fname(struct image_args *args, const char *fname, 110 enum uio_seg segflg); 111 int exec_args_adjust_args(struct image_args *args, size_t consume, 112 ssize_t extend); 113 char *exec_args_get_begin_envv(struct image_args *args); 114 int exec_check_permissions(struct image_params *); 115 void exec_cleanup(struct thread *td, struct vmspace *); 116 int exec_copyout_strings(struct image_params *, uintptr_t *); 117 void exec_free_args(struct image_args *); 118 int exec_map_stack(struct image_params *); 119 int exec_new_vmspace(struct image_params *, struct sysentvec *); 120 void exec_setregs(struct thread *, struct image_params *, uintptr_t); 121 int exec_shell_imgact(struct image_params *); 122 int exec_copyin_args(struct image_args *, const char *, enum uio_seg, 123 char **, char **); 124 int pre_execve(struct thread *td, struct vmspace **oldvmspace); 125 void post_execve(struct thread *td, int error, struct vmspace *oldvmspace); 126 #endif 127 128 #endif /* !_SYS_IMGACT_H_ */ 129