summaryrefslogtreecommitdiff
path: root/plugins/libcsem/exit.c
blob: b5545b96b0feeb647050eb12f43484e1a0ef1475 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122

/* Chrysalide - Outil d'analyse de fichiers binaires
 * exit.c - définition des sorties comme points de non retour
 *
 * Copyright (C) 2015 Cyrille Bagard
 *
 *  This file is part of Chrysalide.
 *
 *  Chrysalide is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Chrysalide is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "exit.h"



/* Modifie toutes les instructions appelant exit(). */
static void mark_one_kind_of_exit_as_return(const GLoadedBinary *, const char *);



/******************************************************************************
*                                                                             *
*  Paramètres  : binary = binaire dont le contenu est en cours de traitement. *
*                                                                             *
*  Description : Modifie toutes les instructions appelant exit().             *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static void mark_one_kind_of_exit_as_return(const GLoadedBinary *binary, const char *fname)
{
    GBinFormat *format;                     /* Format du fichier binaire   */
    GBinSymbol *symbol;                     /* Symbole de fonction trouvé  */
    const mrange_t *range;                  /* Emplacement du symbole      */
    GArchProcessor *proc;                   /* Architecture du binaire     */
    GArchInstruction *instr;                /* Instruction de sortie       */
    instr_link_t *sources;                  /* Instructions diverses liées */
    size_t count;                           /* Nbre de sources affichées   */
    size_t i;                               /* Boucle de parcours          */

    format = G_BIN_FORMAT(g_loaded_binary_get_format(binary));

    if (!g_binary_format_find_symbol_by_label(format, fname, &symbol))
        goto mokoear_exit;

    if (g_binary_symbol_get_target_type(symbol) != STP_ROUTINE)
        goto mokoear_done_with_sym;

    range = g_binary_symbol_get_range(symbol);

    proc = g_loaded_binary_get_processor(binary);

    instr = g_arch_processor_find_instr_by_address(proc,  get_mrange_addr(range));

    g_arch_instruction_rlock_src(instr);
    count = g_arch_instruction_get_sources(instr, &sources);

    for (i = 0; i < count; i++)
    {
        if (sources[i].type != ILT_CALL) continue;

        g_arch_instruction_set_flag(sources[i].linked, AIF_RETURN_POINT);

    }

    g_arch_instruction_runlock_src(instr);

    g_object_unref(G_OBJECT(proc));

 mokoear_done_with_sym:

    g_object_unref(G_OBJECT(symbol));

 mokoear_exit:

    g_object_unref(G_OBJECT(format));

}


/******************************************************************************
*                                                                             *
*  Paramètres  : binary = binaire dont le contenu est en cours de traitement. *
*                                                                             *
*  Description : Modifie toutes les instructions appelant exit().             *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

void mark_exit_calls_as_return_instructions(const GLoadedBinary *binary)
{
    const char **iter;                      /* Boucle de parcours          */

    static const char *exit_functions[] = {
        "exit",
        "_exit",
        "_Exit",
        NULL
    };

    for (iter = exit_functions; *iter != NULL; iter++)
        mark_one_kind_of_exit_as_return(binary, *iter);

}