chrpath: killrpath.c annotate

annotate killrpath.c @ 1:bbbfb3f97919

implement 32 and 64 bit support

author	Peter Meerwald <p.meerwald@bct-electronic.com>
date	Fri, 20 Jul 2012 11:26:24 +0200
parents	b8f7423e385c
children

rev	line source
0 b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	1 /*
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	2 Taken from another list:
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	3
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	4 _Changing_ is a little tricky, but the attached program strips rpaths
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	5 from executables (I find it essential for debugging the binutils).
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	6 It's endian-dependent, if you want this for x86 you can just change
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	7 the occurrences of 'MSB' to 'LSB' and compile (I should really fix
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	8 that).
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	9
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	10 --
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	11 Geoffrey Keating <geoffk@ozemail.com.au>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	12 */
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	13
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	14 #ifdef HAVE_CONFIG_H
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	15 # include "config.h"
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	16 #endif
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	17
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	18 #include <stdio.h>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	19 #include <unistd.h>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	20 #include <fcntl.h>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	21 #include <elf.h>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	22 #if defined(HAVE_LINK_H)
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	23 # include <link.h>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	24 #endif /* HAVE_LINK_H */
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	25 #include <stdlib.h>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	26 #include "protos.h"
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	27 #include <string.h>
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	28
1 bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	29 static int
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	30 killrpath32(int fd, Elf32_Ehdr *ehdr) {
0 b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	31 int i;
1 bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	32 Elf32_Phdr phdr;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	33 Elf32_Dyn *dyns;
0 b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	34 int dynpos;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	35
1 bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	36 if (0 != elf32_find_dynamic_section(fd, ehdr, &phdr))
0 b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	37 {
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	38 perror("found no dynamic section");
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	39 return 1;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	40 }
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	41
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	42 dyns = malloc(phdr.p_memsz);
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	43 if (dyns == NULL)
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	44 {
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	45 perror ("allocating memory for dynamic section");
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	46 return 1;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	47 }
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	48 memset(dyns, 0, phdr.p_memsz);
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	49 if (lseek(fd, phdr.p_offset, SEEK_SET) == -1
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	50 \|\| read(fd, dyns, phdr.p_filesz) != (int)phdr.p_filesz)
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	51 {
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	52 perror ("reading dynamic section");
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	53 return 1;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	54 }
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	55
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	56 dynpos = 0;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	57 for (i = 0; dyns[i].d_tag != DT_NULL; i++)
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	58 {
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	59 dyns[dynpos] = dyns[i];
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	60 if ( ! elf_dynpath_tag(dyns[i].d_tag) )
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	61 dynpos++;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	62 }
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	63 for (; dynpos < i; dynpos++)
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	64 dyns[dynpos].d_tag = DT_NULL;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	65
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	66 if (lseek(fd, phdr.p_offset, SEEK_SET) == -1
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	67 \|\| write(fd, dyns, phdr.p_filesz) != (int)phdr.p_filesz)
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	68 {
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	69 perror ("writing dynamic section");
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	70 return 1;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	71 }
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	72
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	73 elf_close(fd);
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	74
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	75 return 0;
b8f7423e385c import 0.13 Peter Meerwald <pmeerw@pmeerw.net> parents: diff changeset	76 }
1 bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	77
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	78 static int
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	79 killrpath64(int fd, Elf64_Ehdr *ehdr) {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	80 int i;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	81 Elf64_Phdr phdr;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	82 Elf64_Dyn *dyns;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	83 int dynpos;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	84
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	85 if (0 != elf64_find_dynamic_section(fd, ehdr, &phdr))
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	86 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	87 perror("found no dynamic section");
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	88 return 1;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	89 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	90
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	91 dyns = malloc(phdr.p_memsz);
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	92 if (dyns == NULL)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	93 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	94 perror ("allocating memory for dynamic section");
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	95 return 1;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	96 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	97 memset(dyns, 0, phdr.p_memsz);
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	98 if (lseek(fd, phdr.p_offset, SEEK_SET) == -1
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	99 \|\| read(fd, dyns, phdr.p_filesz) != (int)phdr.p_filesz)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	100 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	101 perror ("reading dynamic section");
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	102 return 1;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	103 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	104
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	105 dynpos = 0;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	106 for (i = 0; dyns[i].d_tag != DT_NULL; i++)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	107 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	108 dyns[dynpos] = dyns[i];
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	109 if ( ! elf_dynpath_tag(dyns[i].d_tag) )
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	110 dynpos++;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	111 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	112 for (; dynpos < i; dynpos++)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	113 dyns[dynpos].d_tag = DT_NULL;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	114
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	115 if (lseek(fd, phdr.p_offset, SEEK_SET) == -1
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	116 \|\| write(fd, dyns, phdr.p_filesz) != (int)phdr.p_filesz)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	117 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	118 perror ("writing dynamic section");
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	119 return 1;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	120 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	121
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	122 elf_close(fd);
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	123
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	124 return 0;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	125 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	126
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	127 /* Reads an ELF file, nukes all the RPATH entries. */
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	128
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	129 int
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	130 killrpath(const char *filename)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	131 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	132 int fd;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	133 Elf32_Ehdr ehdr32;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	134 Elf64_Ehdr ehdr64;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	135
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	136 fd = elf32_open(filename, O_RDWR, &ehdr32);
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	137 if (fd >= 0)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	138 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	139 return killrpath32(fd, &ehdr32);
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	140 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	141
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	142 fd = elf64_open(filename, O_RDWR, &ehdr64);
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	143 if (fd >= 0)
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	144 {
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	145 return killrpath64(fd, &ehdr64);
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	146 }
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	147
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	148 perror ("elf_open");
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	149 return 1;
bbbfb3f97919 implement 32 and 64 bit support Peter Meerwald <p.meerwald@bct-electronic.com> parents: 0 diff changeset	150 }

Mercurial > hg > chrpath

annotate killrpath.c @ 1:bbbfb3f97919