Bug Summary

File:src/lib/libelf/gelf_phdr.c
Warning:line 72, column 8
Although the value stored to 'eh32' is used in the enclosing expression, the value is never actually read from 'eh32'

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name gelf_phdr.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libelf/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/lib/libelf -D PIC -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libelf/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/lib/libelf/gelf_phdr.c
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 <gelf.h>
28#include <libelf.h>
29#include <limits.h>
30#include <stdint.h>
31
32#include "_libelf.h"
33
34ELFTC_VCSID("$Id: gelf_phdr.c,v 1.1 2019/02/01 05:27:38 jsg Exp $")__asm__(".ident\t\"" "$Id: gelf_phdr.c,v 1.1 2019/02/01 05:27:38 jsg Exp $"
"\"");
35
36Elf32_Phdr *
37elf32_getphdr(Elf *e)
38{
39 return (_libelf_getphdr(e, ELFCLASS321));
40}
41
42Elf64_Phdr *
43elf64_getphdr(Elf *e)
44{
45 return (_libelf_getphdr(e, ELFCLASS642));
46}
47
48GElf_Phdr *
49gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
50{
51 int ec;
52 Elf32_Ehdr *eh32;
53 Elf64_Ehdr *eh64;
54 Elf32_Phdr *ep32;
55 Elf64_Phdr *ep64;
56 size_t phnum;
57
58 if (d == NULL((void *)0) || e == NULL((void *)0) ||
59 ((ec = e->e_class) != ELFCLASS321 && ec != ELFCLASS642) ||
60 (e->e_kind != ELF_K_ELF) || index < 0 ||
61 elf_getphdrnum(e, &phnum) < 0) {
62 LIBELF_SET_ERROR(ARGUMENT, 0)do { (_libelf.libelf_error) = (((ELF_E_ARGUMENT) & 0xFF) |
(((0)) << 8)); } while (0);
63 return (NULL((void *)0));
64 }
65
66 if ((size_t)index >= phnum) {
67 LIBELF_SET_ERROR(ARGUMENT, 0)do { (_libelf.libelf_error) = (((ELF_E_ARGUMENT) & 0xFF) |
(((0)) << 8)); } while (0);
68 return (NULL((void *)0));
69 }
70
71 if (ec == ELFCLASS321) {
72 if ((eh32 = _libelf_ehdr(e, ELFCLASS321, 0)) == NULL((void *)0) ||
Although the value stored to 'eh32' is used in the enclosing expression, the value is never actually read from 'eh32'
73 ((ep32 = _libelf_getphdr(e, ELFCLASS321)) == NULL((void *)0)))
74 return (NULL((void *)0));
75
76 ep32 += index;
77
78 d->p_type = ep32->p_type;
79 d->p_offset = ep32->p_offset;
80 d->p_vaddr = (Elf64_Addr) ep32->p_vaddr;
81 d->p_paddr = (Elf64_Addr) ep32->p_paddr;
82 d->p_filesz = (Elf64_Xword) ep32->p_filesz;
83 d->p_memsz = (Elf64_Xword) ep32->p_memsz;
84 d->p_flags = ep32->p_flags;
85 d->p_align = (Elf64_Xword) ep32->p_align;
86
87 } else {
88 if ((eh64 = _libelf_ehdr(e, ELFCLASS642, 0)) == NULL((void *)0) ||
89 (ep64 = _libelf_getphdr(e, ELFCLASS642)) == NULL((void *)0))
90 return (NULL((void *)0));
91
92 ep64 += index;
93
94 *d = *ep64;
95 }
96
97 return (d);
98}
99
100Elf32_Phdr *
101elf32_newphdr(Elf *e, size_t count)
102{
103 return (_libelf_newphdr(e, ELFCLASS321, count));
104}
105
106Elf64_Phdr *
107elf64_newphdr(Elf *e, size_t count)
108{
109 return (_libelf_newphdr(e, ELFCLASS642, count));
110}
111
112void *
113gelf_newphdr(Elf *e, size_t count)
114{
115 if (e == NULL((void *)0)) {
116 LIBELF_SET_ERROR(ARGUMENT, 0)do { (_libelf.libelf_error) = (((ELF_E_ARGUMENT) & 0xFF) |
(((0)) << 8)); } while (0);
117 return (NULL((void *)0));
118 }
119 return (_libelf_newphdr(e, e->e_class, count));
120}
121
122int
123gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
124{
125 int ec;
126 size_t phnum;
127 void *ehdr;
128 Elf32_Phdr *ph32;
129 Elf64_Phdr *ph64;
130
131 if (s == NULL((void *)0) || e == NULL((void *)0) || e->e_kind != ELF_K_ELF ||
132 ((ec = e->e_class) != ELFCLASS321 && ec != ELFCLASS642) ||
133 elf_getphdrnum(e, &phnum) < 0) {
134 LIBELF_SET_ERROR(ARGUMENT, 0)do { (_libelf.libelf_error) = (((ELF_E_ARGUMENT) & 0xFF) |
(((0)) << 8)); } while (0);
135 return (0);
136 }
137
138 if (e->e_cmd == ELF_C_READ) {
139 LIBELF_SET_ERROR(MODE, 0)do { (_libelf.libelf_error) = (((ELF_E_MODE) & 0xFF) | ((
(0)) << 8)); } while (0);
140 return (0);
141 }
142
143 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL((void *)0))
144 return (0);
145
146 if (ndx < 0 || (size_t)ndx > phnum) {
147 LIBELF_SET_ERROR(ARGUMENT, 0)do { (_libelf.libelf_error) = (((ELF_E_ARGUMENT) & 0xFF) |
(((0)) << 8)); } while (0);
148 return (0);
149 }
150
151 (void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY0x002U);
152
153 if (ec == ELFCLASS642) {
154 ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
155 *ph64 = *s;
156 return (1);
157 }
158
159 ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
160
161 ph32->p_type = s->p_type;
162 ph32->p_flags = s->p_flags;
163 LIBELF_COPY_U32(ph32, s, p_offset)do { if ((s)->p_offset > 0xffffffffU) { do { (_libelf.libelf_error
) = (((ELF_E_RANGE) & 0xFF) | (((0)) << 8)); } while
(0); return (0); } (ph32)->p_offset = (s)->p_offset &
0xFFFFFFFFU; } while (0);
164 LIBELF_COPY_U32(ph32, s, p_vaddr)do { if ((s)->p_vaddr > 0xffffffffU) { do { (_libelf.libelf_error
) = (((ELF_E_RANGE) & 0xFF) | (((0)) << 8)); } while
(0); return (0); } (ph32)->p_vaddr = (s)->p_vaddr &
0xFFFFFFFFU; } while (0);
165 LIBELF_COPY_U32(ph32, s, p_paddr)do { if ((s)->p_paddr > 0xffffffffU) { do { (_libelf.libelf_error
) = (((ELF_E_RANGE) & 0xFF) | (((0)) << 8)); } while
(0); return (0); } (ph32)->p_paddr = (s)->p_paddr &
0xFFFFFFFFU; } while (0);
166 LIBELF_COPY_U32(ph32, s, p_filesz)do { if ((s)->p_filesz > 0xffffffffU) { do { (_libelf.libelf_error
) = (((ELF_E_RANGE) & 0xFF) | (((0)) << 8)); } while
(0); return (0); } (ph32)->p_filesz = (s)->p_filesz &
0xFFFFFFFFU; } while (0);
167 LIBELF_COPY_U32(ph32, s, p_memsz)do { if ((s)->p_memsz > 0xffffffffU) { do { (_libelf.libelf_error
) = (((ELF_E_RANGE) & 0xFF) | (((0)) << 8)); } while
(0); return (0); } (ph32)->p_memsz = (s)->p_memsz &
0xFFFFFFFFU; } while (0);
168 LIBELF_COPY_U32(ph32, s, p_align)do { if ((s)->p_align > 0xffffffffU) { do { (_libelf.libelf_error
) = (((ELF_E_RANGE) & 0xFF) | (((0)) << 8)); } while
(0); return (0); } (ph32)->p_align = (s)->p_align &
0xFFFFFFFFU; } while (0);
169
170 return (1);
171}