FreeBSD/Linux Kernel Cross Reference
sys/sys/imgact.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1993, David Greenman
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_IMGACT_H_
    #define _SYS_IMGACT_H_
    
    #include <sys/_uio.h>
    
    #include <vm/vm.h>
    
    #define MAXSHELLCMDLEN  PAGE_SIZE
    
    struct ucred;
    
    struct image_args {
            char *buf;              /* pointer to string buffer */
            void *bufkva;           /* cookie for string buffer KVA */
            char *begin_argv;       /* beginning of argv in buf */
            char *begin_envv;       /* (interal use only) beginning of envv in buf,
                                     * access with exec_args_get_begin_envv(). */
            char *endp;             /* current `end' pointer of arg & env strings */
            char *fname;            /* pointer to filename of executable (system space) */
            char *fname_buf;        /* pointer to optional malloc(M_TEMP) buffer */
            int stringspace;        /* space left in arg & env buffer */
            int argc;               /* count of argument strings */
            int envc;               /* count of environment strings */
            int fd;                 /* file descriptor of the executable */
    };
    
    struct image_params {
            struct proc *proc;              /* our process */
            struct label *execlabel;        /* optional exec label */
            struct vnode *vp;               /* pointer to vnode of file to exec */
            struct vm_object *object;       /* The vm object for this vp */
            struct vattr *attr;             /* attributes of file */
            const char *image_header;       /* header of file to exec */
            unsigned long entry_addr;       /* entry address of target executable */
            unsigned long reloc_base;       /* load address of image */
            char *interpreter_name;         /* name of the interpreter */
            void *auxargs;                  /* ELF Auxinfo structure pointer */
            struct sf_buf *firstpage;       /* first page that we mapped */
            void *ps_strings;               /* pointer to ps_string (user space) */
            struct image_args *args;        /* system call arguments */
            struct sysentvec *sysent;       /* system entry vector */
            void *argv;                     /* pointer to argv (user space) */
            void *envv;                     /* pointer to envv (user space) */
            char *execpath;
            void *execpathp;
            char *freepath;
            void *canary;
            int canarylen;
            void *pagesizes;
            int pagesizeslen;
            vm_prot_t stack_prot;
            u_long stack_sz;
            struct ucred *newcred;          /* new credentials if changing */
    #define IMGACT_SHELL    0x1
    #define IMGACT_BINMISC  0x2
            unsigned char interpreted;      /* mask of interpreters that have run */
            bool credential_setid;          /* true if becoming setid */
            bool vmspace_destroyed;         /* we've blown away original vm space */
            bool opened;                    /* we have opened executable vnode */
            bool textset;
            u_int map_flags;
    #define IMGP_ASLR_SHARED_PAGE   0x1
            uint32_t imgp_flags;
            struct vnode *interpreter_vp;   /* vnode of the interpreter */
    };
    
   #ifdef _KERNEL
   struct sysentvec;
   struct thread;
   struct vmspace;
   
   int     exec_alloc_args(struct image_args *);
   int     exec_args_add_arg(struct image_args *args, const char *argp,
               enum uio_seg segflg);
   int     exec_args_add_env(struct image_args *args, const char *envp,
               enum uio_seg segflg);
   int     exec_args_add_fname(struct image_args *args, const char *fname,
               enum uio_seg segflg);
   int     exec_args_adjust_args(struct image_args *args, size_t consume,
               ssize_t extend);
   char    *exec_args_get_begin_envv(struct image_args *args);
   int     exec_check_permissions(struct image_params *);
   void    exec_cleanup(struct thread *td, struct vmspace *);
   int     exec_copyout_strings(struct image_params *, uintptr_t *);
   void    exec_free_args(struct image_args *);
   int     exec_map_stack(struct image_params *);
   int     exec_new_vmspace(struct image_params *, struct sysentvec *);
   void    exec_setregs(struct thread *, struct image_params *, uintptr_t);
   int     exec_shell_imgact(struct image_params *);
   int     exec_copyin_args(struct image_args *, const char *, enum uio_seg,
           char **, char **);
   int     pre_execve(struct thread *td, struct vmspace **oldvmspace);
   void    post_execve(struct thread *td, int error, struct vmspace *oldvmspace);
   #endif
   
   #endif /* !_SYS_IMGACT_H_ */

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