elf/tst-auditmod24d.c

   1 /* Audit module for tst-audit24d.
   2    Copyright (C) 2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <link.h>
  20 #include <inttypes.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <tst-auditmod24.h>
  24
  25 #define AUDIT24_COOKIE     0x0
  26 #define AUDIT24MOD1_COOKIE 0x1
  27 #define AUDIT24MOD2_COOKIE 0x2
  28 #define AUDIT24MOD3_COOKIE 0x3
  29 #define AUDIT24MOD4_COOKIE 0x4
  30
  31 unsigned int
  32 la_version (unsigned int version)
  33 {
  34   return LAV_CURRENT;
  35 }
  36
  37 unsigned int
  38 la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
  39 {
  40   const char *p = strrchr (map->l_name, '/');
  41   const char *l_name = p == NULL ? "tst-audit24d" : p + 1;
  42
  43   uintptr_t ck = -1;
  44   if (strcmp (l_name, "tst-audit24dmod1.so") == 0)
  45     ck = AUDIT24MOD1_COOKIE;
  46   else if (strcmp (l_name, "tst-audit24dmod2.so") == 0)
  47     ck = AUDIT24MOD2_COOKIE;
  48   else if (strcmp (l_name, "tst-audit24dmod3.so") == 0)
  49     ck = AUDIT24MOD3_COOKIE;
  50   else if (strcmp (l_name, "tst-audit24dmod.so") == 0)
  51     ck = AUDIT24MOD4_COOKIE;
  52   else if (strcmp (l_name, "tst-audit24d") == 0)
  53     ck = AUDIT24_COOKIE;
  54
  55   *cookie = ck;
  56   return ck == -1 ? 0 : LA_FLG_BINDFROM | LA_FLG_BINDTO;
  57 }
  58
  59 static int
  60 tst_audit24dmod1_func1 (void)
  61 {
  62   return 1;
  63 }
  64
  65 static int
  66 tst_audit24dmod2_func1 (void)
  67 {
  68   return 10;
  69 }
  70
  71 static int
  72 tst_audit24dmod3_func1 (void)
  73 {
  74   return 30;
  75 }
  76
  77 #include <stdio.h>
  78
  79 #if __ELF_NATIVE_CLASS == 64
  80 uintptr_t
  81 la_symbind64 (Elf64_Sym *sym, unsigned int ndx,
  82               uintptr_t *refcook, uintptr_t *defcook,
  83               unsigned int *flags, const char *symname)
  84 #else
  85 uintptr_t
  86 la_symbind32 (Elf32_Sym *sym, unsigned int ndx,
  87               uintptr_t *refcook, uintptr_t *defcook,
  88               unsigned int *flags, const char *symname)
  89 #endif
  90 {
  91   if (*refcook == AUDIT24_COOKIE)
  92     {
  93       if (*defcook == AUDIT24MOD1_COOKIE)
  94           {
  95             if (strcmp (symname, "tst_audit24dmod1_func1") == 0)
  96               return (uintptr_t) tst_audit24dmod1_func1;
  97             else if (strcmp (symname, "tst_audit24dmod1_func2") == 0)
  98               return sym->st_value;
  99             abort ();
 100           }
 101       if (*defcook == AUDIT24MOD2_COOKIE
 102           && (strcmp (symname, "tst_audit24dmod2_func1") == 0))
 103         return (uintptr_t) tst_audit24dmod2_func1;
 104
 105       /* malloc functions.  */
 106       return sym->st_value;
 107     }
 108   else if (*refcook == AUDIT24MOD1_COOKIE)
 109     {
 110       if (*defcook == AUDIT24MOD3_COOKIE
 111           && strcmp (symname, "tst_audit24dmod3_func1") == 0)
 112         {
 113           test_symbind_flags (*flags);
 114
 115           return (uintptr_t) tst_audit24dmod3_func1;
 116         }
 117     }
 118
 119   if (symname[0] != '\0')
 120     abort ();
 121   return sym->st_value;
 122 }