The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/ksyms.c

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    1 /*      $OpenBSD: ksyms.c,v 1.34 2022/01/08 22:54:49 guenther Exp $     */
    2 /*
    3  * Copyright (c) 1998 Todd C. Miller <millert@openbsd.org>
    4  * Copyright (c) 2001 Artur Grabowski <art@openbsd.org>
    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  *
   16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
   17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
   18  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
   19  * THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/exec.h>
   30 #include <sys/systm.h>
   31 #include <sys/uio.h>
   32 #include <sys/malloc.h>
   33 #include <sys/fcntl.h>
   34 #include <sys/conf.h>
   35 #include <sys/exec_elf.h>
   36 
   37 extern char *esym;                              /* end of symbol table */
   38 #if defined(__sparc64__) || defined(__mips__) || defined(__amd64__) || \
   39     defined(__i386__) || defined(__powerpc64__)
   40 extern char *ssym;                              /* end of kernel */
   41 #else
   42 extern long end;                                /* end of kernel */
   43 #endif
   44 
   45 static caddr_t ksym_head;
   46 static caddr_t ksym_syms;
   47 static size_t ksym_head_size;
   48 static size_t ksym_syms_size;
   49 
   50 void    ksymsattach(int);
   51 
   52 void
   53 ksymsattach(int num)
   54 {
   55 
   56 #if defined(__sparc64__) || defined(__mips__) || defined(__amd64__) || \
   57     defined(__i386__) || defined(__powerpc64__)
   58         if (esym <= ssym) {
   59                 printf("/dev/ksyms: Symbol table not valid.\n");
   60                 return;
   61         }
   62 #else
   63         if (esym <= (char *)&end) {
   64                 printf("/dev/ksyms: Symbol table not valid.\n");
   65                 return;
   66         }
   67 #endif
   68 
   69         do {
   70 #if defined(__sparc64__) || defined(__mips__) || defined(__amd64__) || \
   71     defined(__i386__) || defined(__powerpc64__)
   72                 caddr_t symtab = ssym;
   73 #else
   74                 caddr_t symtab = (caddr_t)&end;
   75 #endif
   76                 Elf_Ehdr *elf;
   77                 Elf_Shdr *shdr;
   78                 int i;
   79 
   80                 elf = (Elf_Ehdr *)symtab;
   81                 if (memcmp(elf->e_ident, ELFMAG, SELFMAG) != 0 ||
   82                     elf->e_ident[EI_CLASS] != ELFCLASS ||
   83                     elf->e_machine != ELF_TARG_MACH)
   84                         break;
   85 
   86                 shdr = (Elf_Shdr *)&symtab[elf->e_shoff];
   87                 for (i = 0; i < elf->e_shnum; i++) {
   88                         if (shdr[i].sh_type == SHT_SYMTAB) {
   89                                 break;
   90                         }
   91                 }
   92 
   93                 /*
   94                  * No symbol table found.
   95                  */
   96                 if (i == elf->e_shnum)
   97                         break;
   98 
   99                 /*
  100                  * No additional header.
  101                  */
  102                 ksym_head_size = 0;
  103                 ksym_syms = symtab;
  104                 ksym_syms_size = (size_t)(esym - symtab);
  105 
  106                 return;
  107         } while (0);
  108 }
  109 
  110 int
  111 ksymsopen(dev_t dev, int flag, int mode, struct proc *p)
  112 {
  113 
  114         /* There are no non-zero minor devices */
  115         if (minor(dev) != 0)
  116                 return (ENXIO);
  117 
  118         /* This device is read-only */
  119         if ((flag & FWRITE))
  120                 return (EPERM);
  121 
  122         /* ksym_syms must be initialized */
  123         if (ksym_syms == NULL)
  124                 return (ENXIO);
  125 
  126         return (0);
  127 }
  128 
  129 int
  130 ksymsclose(dev_t dev, int flag, int mode, struct proc *p)
  131 {
  132 
  133         return (0);
  134 }
  135 
  136 int
  137 ksymsread(dev_t dev, struct uio *uio, int flags)
  138 {
  139         int error;
  140         size_t len;
  141         caddr_t v;
  142         size_t off;
  143 
  144         if (uio->uio_offset < 0)
  145                 return (EINVAL);
  146 
  147         while (uio->uio_resid > 0) {
  148                 if (uio->uio_offset >= ksym_head_size + ksym_syms_size)
  149                         break;
  150 
  151                 if (uio->uio_offset < ksym_head_size) {
  152                         v = ksym_head + uio->uio_offset;
  153                         len = ksym_head_size - uio->uio_offset;
  154                 } else {
  155                         off = uio->uio_offset - ksym_head_size;
  156                         v = ksym_syms + off;
  157                         len = ksym_syms_size - off;
  158                 }
  159 
  160                 if (len > uio->uio_resid)
  161                         len = uio->uio_resid;
  162 
  163                 if ((error = uiomove(v, len, uio)) != 0)
  164                         return (error);
  165         }
  166 
  167         return (0);
  168 }

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