File: | src/lib/libelf/libelf_phdr.c |
Warning: | line 123, column 7 Although the value stored to 'ehdr' is used in the enclosing expression, the value is never actually read from 'ehdr' |
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1 | /*- |
2 | * Copyright (c) 2006,2008 Joseph Koshy |
3 | * All rights reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
24 | * SUCH DAMAGE. |
25 | */ |
26 | |
27 | #include <assert.h> |
28 | #include <gelf.h> |
29 | #include <libelf.h> |
30 | #include <stdlib.h> |
31 | |
32 | #include "_libelf.h" |
33 | |
34 | ELFTC_VCSID("$Id: libelf_phdr.c,v 1.3 2020/05/18 06:46:23 jsg Exp $")__asm__(".ident\t\"" "$Id: libelf_phdr.c,v 1.3 2020/05/18 06:46:23 jsg Exp $" "\""); |
35 | |
36 | void * |
37 | _libelf_getphdr(Elf *e, int ec) |
38 | { |
39 | size_t phnum; |
40 | size_t fsz, msz; |
41 | uint64_t phoff; |
42 | Elf32_Ehdr *eh32; |
43 | Elf64_Ehdr *eh64; |
44 | void *ehdr, *phdr; |
45 | _libelf_translator_function *xlator; |
46 | |
47 | assert(ec == ELFCLASS32 || ec == ELFCLASS64)((ec == 1 || ec == 2) ? (void)0 : __assert2("/usr/src/lib/libelf/libelf_phdr.c" , 47, __func__, "ec == ELFCLASS32 || ec == ELFCLASS64")); |
48 | |
49 | if (e == NULL((void *)0)) { |
50 | LIBELF_SET_ERROR(ARGUMENT, 0)do { (_libelf.libelf_error) = (((ELF_E_ARGUMENT) & 0xFF) | (((0)) << 8)); } while (0); |
51 | return (NULL((void *)0)); |
52 | } |
53 | |
54 | if ((phdr = (ec == ELFCLASS321 ? |
55 | (void *) e->e_u.e_elf.e_phdr.e_phdr32 : |
56 | (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL((void *)0)) |
57 | return (phdr); |
58 | |
59 | /* |
60 | * Check the PHDR related fields in the EHDR for sanity. |
61 | */ |
62 | |
63 | if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL((void *)0)) |
64 | return (NULL((void *)0)); |
65 | |
66 | phnum = e->e_u.e_elf.e_nphdr; |
67 | |
68 | if (ec == ELFCLASS321) { |
69 | eh32 = (Elf32_Ehdr *) ehdr; |
70 | phoff = (uint64_t) eh32->e_phoff; |
71 | } else { |
72 | eh64 = (Elf64_Ehdr *) ehdr; |
73 | phoff = (uint64_t) eh64->e_phoff; |
74 | } |
75 | |
76 | fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version); |
77 | |
78 | assert(fsz > 0)((fsz > 0) ? (void)0 : __assert2("/usr/src/lib/libelf/libelf_phdr.c" , 78, __func__, "fsz > 0")); |
79 | |
80 | if (phoff + fsz < phoff) { /* Numeric overflow. */ |
81 | LIBELF_SET_ERROR(HEADER, 0)do { (_libelf.libelf_error) = (((ELF_E_HEADER) & 0xFF) | ( ((0)) << 8)); } while (0); |
82 | return (NULL((void *)0)); |
83 | } |
84 | |
85 | if ((uint64_t) e->e_rawsize < (phoff + fsz)) { |
86 | LIBELF_SET_ERROR(HEADER, 0)do { (_libelf.libelf_error) = (((ELF_E_HEADER) & 0xFF) | ( ((0)) << 8)); } while (0); |
87 | return (NULL((void *)0)); |
88 | } |
89 | |
90 | if ((msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT1)) == 0) |
91 | return (NULL((void *)0)); |
92 | |
93 | if ((phdr = calloc(phnum, msz)) == NULL((void *)0)) { |
94 | LIBELF_SET_ERROR(RESOURCE, 0)do { (_libelf.libelf_error) = (((ELF_E_RESOURCE) & 0xFF) | (((0)) << 8)); } while (0); |
95 | return (NULL((void *)0)); |
96 | } |
97 | |
98 | if (ec == ELFCLASS321) |
99 | e->e_u.e_elf.e_phdr.e_phdr32 = phdr; |
100 | else |
101 | e->e_u.e_elf.e_phdr.e_phdr64 = phdr; |
102 | |
103 | |
104 | xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec, |
105 | _libelf_elfmachine(e)); |
106 | (*xlator)(phdr, phnum * msz, e->e_rawfile + phoff, phnum, |
107 | e->e_byteorder != LIBELF_PRIVATE(byteorder)(_libelf.libelf_byteorder)); |
108 | |
109 | return (phdr); |
110 | } |
111 | |
112 | void * |
113 | _libelf_newphdr(Elf *e, int ec, size_t count) |
114 | { |
115 | void *ehdr, *newphdr, *oldphdr; |
116 | size_t msz; |
117 | |
118 | if (e == NULL((void *)0)) { |
119 | LIBELF_SET_ERROR(ARGUMENT, 0)do { (_libelf.libelf_error) = (((ELF_E_ARGUMENT) & 0xFF) | (((0)) << 8)); } while (0); |
120 | return (NULL((void *)0)); |
121 | } |
122 | |
123 | if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL((void *)0)) { |
Although the value stored to 'ehdr' is used in the enclosing expression, the value is never actually read from 'ehdr' | |
124 | LIBELF_SET_ERROR(SEQUENCE, 0)do { (_libelf.libelf_error) = (((ELF_E_SEQUENCE) & 0xFF) | (((0)) << 8)); } while (0); |
125 | return (NULL((void *)0)); |
126 | } |
127 | |
128 | assert(e->e_class == ec)((e->e_class == ec) ? (void)0 : __assert2("/usr/src/lib/libelf/libelf_phdr.c" , 128, __func__, "e->e_class == ec")); |
129 | assert(ec == ELFCLASS32 || ec == ELFCLASS64)((ec == 1 || ec == 2) ? (void)0 : __assert2("/usr/src/lib/libelf/libelf_phdr.c" , 129, __func__, "ec == ELFCLASS32 || ec == ELFCLASS64")); |
130 | assert(e->e_version == EV_CURRENT)((e->e_version == 1) ? (void)0 : __assert2("/usr/src/lib/libelf/libelf_phdr.c" , 130, __func__, "e->e_version == EV_CURRENT")); |
131 | |
132 | if ((msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version)) == 0) |
133 | return (NULL((void *)0)); |
134 | |
135 | newphdr = NULL((void *)0); |
136 | if (count > 0 && (newphdr = calloc(count, msz)) == NULL((void *)0)) { |
137 | LIBELF_SET_ERROR(RESOURCE, 0)do { (_libelf.libelf_error) = (((ELF_E_RESOURCE) & 0xFF) | (((0)) << 8)); } while (0); |
138 | return (NULL((void *)0)); |
139 | } |
140 | |
141 | if (ec == ELFCLASS321) { |
142 | if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL((void *)0)) |
143 | free(oldphdr); |
144 | e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr; |
145 | } else { |
146 | if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL((void *)0)) |
147 | free(oldphdr); |
148 | e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr; |
149 | } |
150 | |
151 | e->e_u.e_elf.e_nphdr = count; |
152 | |
153 | elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY0x002U); |
154 | |
155 | return (newphdr); |
156 | } |