/src/libbpf/elfutils/libelf/gelf_getphdr.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* Return program header table entry. |
2 | | Copyright (C) 1998-2010, 2015 Red Hat, Inc. |
3 | | This file is part of elfutils. |
4 | | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
5 | | |
6 | | This file is free software; you can redistribute it and/or modify |
7 | | it under the terms of either |
8 | | |
9 | | * the GNU Lesser General Public License as published by the Free |
10 | | Software Foundation; either version 3 of the License, or (at |
11 | | your option) any later version |
12 | | |
13 | | or |
14 | | |
15 | | * the GNU General Public License as published by the Free |
16 | | Software Foundation; either version 2 of the License, or (at |
17 | | your option) any later version |
18 | | |
19 | | or both in parallel, as here. |
20 | | |
21 | | elfutils is distributed in the hope that it will be useful, but |
22 | | WITHOUT ANY WARRANTY; without even the implied warranty of |
23 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
24 | | General Public License for more details. |
25 | | |
26 | | You should have received copies of the GNU General Public License and |
27 | | the GNU Lesser General Public License along with this program. If |
28 | | not, see <http://www.gnu.org/licenses/>. */ |
29 | | |
30 | | #ifdef HAVE_CONFIG_H |
31 | | # include <config.h> |
32 | | #endif |
33 | | |
34 | | #include <gelf.h> |
35 | | #include <string.h> |
36 | | #include <stdbool.h> |
37 | | |
38 | | #include "libelfP.h" |
39 | | |
40 | | |
41 | | GElf_Phdr * |
42 | | gelf_getphdr (Elf *elf, int ndx, GElf_Phdr *dst) |
43 | 0 | { |
44 | 0 | GElf_Phdr *result = NULL; |
45 | |
|
46 | 0 | if (elf == NULL) |
47 | 0 | return NULL; |
48 | | |
49 | 0 | if (unlikely (elf->kind != ELF_K_ELF)) |
50 | 0 | { |
51 | 0 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
52 | 0 | return NULL; |
53 | 0 | } |
54 | | |
55 | 0 | if (dst == NULL) |
56 | 0 | { |
57 | 0 | __libelf_seterrno (ELF_E_INVALID_OPERAND); |
58 | 0 | return NULL; |
59 | 0 | } |
60 | | |
61 | 0 | rwlock_rdlock (elf->lock); |
62 | |
|
63 | 0 | if (elf->class == ELFCLASS32) |
64 | 0 | { |
65 | | /* Copy the elements one-by-one. */ |
66 | 0 | Elf32_Phdr *phdr = elf->state.elf32.phdr; |
67 | |
|
68 | 0 | if (phdr == NULL) |
69 | 0 | { |
70 | 0 | rwlock_unlock (elf->lock); |
71 | 0 | phdr = INTUSE(elf32_getphdr) (elf); |
72 | 0 | if (phdr == NULL) |
73 | | /* The error number is already set. */ |
74 | 0 | return NULL; |
75 | 0 | rwlock_rdlock (elf->lock); |
76 | 0 | } |
77 | | |
78 | | /* Test whether the index is ok. */ |
79 | 0 | size_t phnum; |
80 | 0 | if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0 |
81 | 0 | || (size_t) ndx >= phnum) |
82 | 0 | { |
83 | 0 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
84 | 0 | goto out; |
85 | 0 | } |
86 | | |
87 | | /* We know the result now. */ |
88 | 0 | result = dst; |
89 | | |
90 | | /* Now correct the pointer to point to the correct element. */ |
91 | 0 | phdr += ndx; |
92 | |
|
93 | 0 | #define COPY(Name) result->Name = phdr->Name |
94 | 0 | COPY (p_type); |
95 | 0 | COPY (p_offset); |
96 | 0 | COPY (p_vaddr); |
97 | 0 | COPY (p_paddr); |
98 | 0 | COPY (p_filesz); |
99 | 0 | COPY (p_memsz); |
100 | 0 | COPY (p_flags); |
101 | 0 | COPY (p_align); |
102 | 0 | } |
103 | 0 | else |
104 | 0 | { |
105 | | /* Copy the elements one-by-one. */ |
106 | 0 | Elf64_Phdr *phdr = elf->state.elf64.phdr; |
107 | |
|
108 | 0 | if (phdr == NULL) |
109 | 0 | { |
110 | 0 | rwlock_unlock (elf->lock); |
111 | 0 | phdr = INTUSE(elf64_getphdr) (elf); |
112 | 0 | if (phdr == NULL) |
113 | | /* The error number is already set. */ |
114 | 0 | return NULL; |
115 | 0 | rwlock_rdlock (elf->lock); |
116 | 0 | } |
117 | | |
118 | | /* Test whether the index is ok. */ |
119 | 0 | size_t phnum; |
120 | 0 | if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0 |
121 | 0 | || (size_t) ndx >= phnum) |
122 | 0 | { |
123 | 0 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
124 | 0 | goto out; |
125 | 0 | } |
126 | | |
127 | | /* We only have to copy the data. */ |
128 | 0 | result = memcpy (dst, phdr + ndx, sizeof (GElf_Phdr)); |
129 | 0 | } |
130 | | |
131 | 0 | out: |
132 | 0 | rwlock_unlock (elf->lock); |
133 | |
|
134 | 0 | return result; |
135 | 0 | } |