lukechilds
/
termux-packages
mirror of https://github.com/lukechilds/termux-packages.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

termux-elf-cleaner: Move to standalone repo

android-5
Fredrik Fornwall 8 years ago
parent
4c8a7b9f9c
commit
0085c3b7a4
3 changed files with 5 additions and 370 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 10
      packages/termux-elf-cleaner/build.sh
  2. 211
      packages/termux-elf-cleaner/elf.h
  3. 154
      packages/termux-elf-cleaner/termux-elf-cleaner.cpp

10
packages/termux-elf-cleaner/build.sh
View File

@ -1,7 +1,7 @@
TERMUX_PKG_HOMEPAGE=https://termux.com/
TERMUX_PKG_HOMEPAGE=https://github.com/termux/termux-elf-cleaner
TERMUX_PKG_DESCRIPTION="Cleaner of ELF files for Android"
TERMUX_PKG_VERSION=1.1
termux_step_make_install () {
$CXX $CFLAGS $LDFLAGS -std=c++14 -Wall -Wextra -pedantic -Werror $TERMUX_PKG_BUILDER_DIR/*.cpp -o $TERMUX_PREFIX/bin/termux-elf-cleaner
}
TERMUX_PKG_SRCURL=https://github.com/termux/termux-elf-cleaner/archive/v${TERMUX_PKG_VERSION}.tar.gz
TERMUX_PKG_SHA256=66612b294e197ab7bfac807e497581df58424af6a7c855f89fc12eafa3dc1b8c
TERMUX_PKG_FOLDERNAME=termux-elf-cleaner-$TERMUX_PKG_VERSION
TERMUX_PKG_BUILD_IN_SRC=yes

211
packages/termux-elf-cleaner/elf.h
View File

@ -1,211 +0,0 @@
#ifndef ELF_H_INCLUDED
#define ELF_H_INCLUDED
#include <stdint.h>
/* Type for a 16-bit quantity. */
typedef uint16_t Elf32_Half;
typedef uint16_t Elf64_Half;
/* Types for signed and unsigned 32-bit quantities. */
typedef uint32_t Elf32_Word;
typedef int32_t Elf32_Sword;
typedef uint32_t Elf64_Word;
typedef int32_t Elf64_Sword;
/* Types for signed and unsigned 64-bit quantities. */
typedef uint64_t Elf32_Xword;
typedef int64_t Elf32_Sxword;
typedef uint64_t Elf64_Xword;
typedef int64_t Elf64_Sxword;
/* Type of addresses. */
typedef uint32_t Elf32_Addr;
typedef uint64_t Elf64_Addr;
/* Type of file offsets. */
typedef uint32_t Elf32_Off;
typedef uint64_t Elf64_Off;
/* Type for section indices, which are 16-bit quantities. */
typedef uint16_t Elf32_Section;
typedef uint16_t Elf64_Section;
/* Type for version symbol information. */
typedef Elf32_Half Elf32_Versym;
typedef Elf64_Half Elf64_Versym;
/* The ELF file header. This appears at the start of every ELF file. */
typedef struct {
unsigned char e_ident[16]; /* Magic number and other info */
Elf32_Half e_type; /* Object file type */
Elf32_Half e_machine; /* Architecture */
Elf32_Word e_version; /* Object file version */
Elf32_Addr e_entry; /* Entry point virtual address */
Elf32_Off e_phoff; /* Program header table (usually follows elf header directly) file offset */
Elf32_Off e_shoff; /* Section header table (at end of file) file offset */
Elf32_Word e_flags; /* Processor-specific flags */
Elf32_Half e_ehsize; /* ELF header size in bytes */
Elf32_Half e_phentsize; /* Program header table entry size */
Elf32_Half e_phnum; /* Program header table entry count */
Elf32_Half e_shentsize; /* Section header table entry size */
Elf32_Half e_shnum; /* Section header table entry count */
Elf32_Half e_shstrndx; /* Section header string table index */
} Elf32_Ehdr;
typedef struct {
unsigned char e_ident[16]; /* Magic number and other info */
Elf64_Half e_type; /* Object file type */
Elf64_Half e_machine; /* Architecture */
Elf64_Word e_version; /* Object file version */
Elf64_Addr e_entry; /* Entry point virtual address */
Elf64_Off e_phoff; /* Program header table file offset */
Elf64_Off e_shoff; /* Section header table file offset */
Elf64_Word e_flags; /* Processor-specific flags */
Elf64_Half e_ehsize; /* ELF header size in bytes */
Elf64_Half e_phentsize; /* Program header table entry size */
Elf64_Half e_phnum; /* Program header table entry count */
Elf64_Half e_shentsize; /* Section header table entry size */
Elf64_Half e_shnum; /* Section header table entry count */
Elf64_Half e_shstrndx; /* Section header string table index */
} Elf64_Ehdr;
/* Section header entry. The number of section entries in the file are determined by the "e_shnum" field of the ELF header.*/
typedef struct {
Elf32_Word sh_name; /* Section name (string tbl index) */
Elf32_Word sh_type; /* Section type */
Elf32_Word sh_flags; /* Section flags */
Elf32_Addr sh_addr; /* Section virtual addr at execution */
Elf32_Off sh_offset; /* Section file offset */
Elf32_Word sh_size; /* Section size in bytes */
Elf32_Word sh_link; /* Link to another section */
Elf32_Word sh_info; /* Additional section information */
Elf32_Word sh_addralign; /* Section alignment */
Elf32_Word sh_entsize; /* Entry size if section holds table */
} Elf32_Shdr;
typedef struct {
Elf64_Word sh_name; /* Section name (string tbl index) */
Elf64_Word sh_type; /* Section type */
Elf64_Xword sh_flags; /* Section flags */
Elf64_Addr sh_addr; /* Section virtual addr at execution */
Elf64_Off sh_offset; /* Section file offset */
Elf64_Xword sh_size; /* Section size in bytes */
Elf64_Word sh_link; /* Link to another section */
Elf64_Word sh_info; /* Additional section information */
Elf64_Xword sh_addralign; /* Section alignment */
Elf64_Xword sh_entsize; /* Entry size if section holds table */
} Elf64_Shdr;
/* Legal values for sh_type (section type). */
#define SHT_NULL 0 /* Section header table entry unused */
#define SHT_PROGBITS 1 /* Program data */
#define SHT_SYMTAB 2 /* Symbol table */
#define SHT_STRTAB 3 /* String table */
#define SHT_RELA 4 /* Relocation entries with addends */
#define SHT_HASH 5 /* Symbol hash table */
#define SHT_DYNAMIC 6 /* Dynamic linking information. Contains Elf32_Dyn/Elf64_Dyn entries. */
#define SHT_NOTE 7 /* Notes */
#define SHT_NOBITS 8 /* Program space with no data (bss) */
#define SHT_REL 9 /* Relocation entries, no addends */
#define SHT_SHLIB 10 /* Reserved */
#define SHT_DYNSYM 11 /* Dynamic linker symbol table */
#define SHT_INIT_ARRAY 14 /* Array of constructors */
#define SHT_FINI_ARRAY 15 /* Array of destructors */
#define SHT_PREINIT_ARRAY 16 /* Array of pre-constructors */
#define SHT_GROUP 17 /* Section group */
#define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */
#define SHT_NUM 19 /* Number of defined types. */
#define SHT_LOOS 0x60000000 /* Start OS-specific. */
#define SHT_GNU_ATTRIBUTES 0x6ffffff5 /* Object attributes. */
#define SHT_GNU_HASH 0x6ffffff6 /* GNU-style hash table. */
#define SHT_GNU_LIBLIST 0x6ffffff7 /* Prelink library list */
#define SHT_CHECKSUM 0x6ffffff8 /* Checksum for DSO content. */
#define SHT_LOSUNW 0x6ffffffa /* Sun-specific low bound. */
#define SHT_SUNW_move 0x6ffffffa
#define SHT_SUNW_COMDAT 0x6ffffffb
#define SHT_SUNW_syminfo 0x6ffffffc
#define SHT_GNU_verdef 0x6ffffffd /* Version definition section. */
#define SHT_GNU_verneed 0x6ffffffe /* Version needs section. */
#define SHT_GNU_versym 0x6fffffff /* Version symbol table. */
#define SHT_HISUNW 0x6fffffff /* Sun-specific high bound. */
#define SHT_HIOS 0x6fffffff /* End OS-specific type */
#define SHT_LOPROC 0x70000000 /* Start of processor-specific */
#define SHT_HIPROC 0x7fffffff /* End of processor-specific */
#define SHT_LOUSER 0x80000000 /* Start of application-specific */
#define SHT_HIUSER 0x8fffffff /* End of application-specific */
/* Dynamic section entry. */
typedef struct {
Elf32_Sword d_tag; /* Dynamic entry type */
union { Elf32_Word d_val; Elf32_Addr d_ptr; } d_un; /* Integer or address value */
} Elf32_Dyn;
typedef struct {
Elf64_Sxword d_tag; /* Dynamic entry type */
union { Elf64_Xword d_val; Elf64_Addr d_ptr; } d_un; /* Integer or address value */
} Elf64_Dyn;
/* Legal values for d_tag (dynamic entry type). */
#define DT_NULL 0 /* Marks end of dynamic section */
#define DT_NEEDED 1 /* Name of needed library */
#define DT_PLTRELSZ 2 /* Size in bytes of PLT relocs */
#define DT_PLTGOT 3 /* Processor defined value */
#define DT_HASH 4 /* Address of symbol hash table */
#define DT_STRTAB 5 /* Address of string table */
#define DT_SYMTAB 6 /* Address of symbol table */
#define DT_RELA 7 /* Address of Rela relocs */
#define DT_RELASZ 8 /* Total size of Rela relocs */
#define DT_RELAENT 9 /* Size of one Rela reloc */
#define DT_STRSZ 10 /* Size of string table */
#define DT_SYMENT 11 /* Size of one symbol table entry */
#define DT_INIT 12 /* Address of init function */
#define DT_FINI 13 /* Address of termination function */
#define DT_SONAME 14 /* Name of shared object */
#define DT_RPATH 15 /* Library search path (deprecated) */
#define DT_SYMBOLIC 16 /* Start symbol search here */
#define DT_REL 17 /* Address of Rel relocs */
#define DT_RELSZ 18 /* Total size of Rel relocs */
#define DT_RELENT 19 /* Size of one Rel reloc */
#define DT_PLTREL 20 /* Type of reloc in PLT */
#define DT_DEBUG 21 /* For debugging; unspecified */
#define DT_TEXTREL 22 /* Reloc might modify .text */
#define DT_JMPREL 23 /* Address of PLT relocs */
#define DT_BIND_NOW 24 /* Process relocations of object */
#define DT_INIT_ARRAY 25 /* Array with addresses of init fct */
#define DT_FINI_ARRAY 26 /* Array with addresses of fini fct */
#define DT_INIT_ARRAYSZ 27 /* Size in bytes of DT_INIT_ARRAY */
#define DT_FINI_ARRAYSZ 28 /* Size in bytes of DT_FINI_ARRAY */
#define DT_RUNPATH 29 /* Library search path */
#define DT_FLAGS 30 /* Flags for the object being loaded */
#define DT_ENCODING 32 /* Start of encoded range */
#define DT_PREINIT_ARRAY 32 /* Array with addresses of preinit fct*/
#define DT_PREINIT_ARRAYSZ 33 /* size in bytes of DT_PREINIT_ARRAY */
#define DT_NUM 34 /* Number used */
#define DT_LOOS 0x6000000d /* Start of OS-specific */
#define DT_HIOS 0x6ffff000 /* End of OS-specific */
#define DT_VERDEF 0x6ffffffc
#define DT_VERDEFNUM 0x6ffffffd
#define DT_LOPROC 0x70000000 /* Start of processor-specific */
#define DT_HIPROC 0x7fffffff /* End of processor-specific */
/* Symbol table entry. */
typedef struct {
Elf32_Word st_name; /* Symbol name (string tbl index) */
Elf32_Addr st_value; /* Symbol value */
Elf32_Word st_size; /* Symbol size */
unsigned char st_info; /* Symbol type and binding */
unsigned char st_other; /* Symbol visibility */
Elf32_Section st_shndx; /* Section index */
} Elf32_Sym;
typedef struct {
Elf64_Word st_name; /* Symbol name (string tbl index) */
unsigned char st_info; /* Symbol type and binding */
unsigned char st_other; /* Symbol visibility */
Elf64_Section st_shndx; /* Section index */
Elf64_Addr st_value; /* Symbol value */
Elf64_Xword st_size; /* Symbol size */
} Elf64_Sym;
#endif

154
packages/termux-elf-cleaner/termux-elf-cleaner.cpp
View File

@ -1,154 +0,0 @@
#include <algorithm>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef __APPLE__
# include "elf.h"
#else
# include <elf.h>
#endif
#define DT_VERSYM 0x6ffffff0
#define DT_VERNEEDED 0x6ffffffe
#define DT_VERNEEDNUM 0x6fffffff
template<typename ElfHeaderType /*Elf{32,64}_Ehdr*/,
typename ElfSectionHeaderType /*Elf{32,64}_Shdr*/,
typename ElfDynamicSectionEntryType /* Elf{32,64}_Dyn */>
bool process_elf(uint8_t* bytes, size_t elf_file_size, char const* file_name)
{
if (sizeof(ElfSectionHeaderType) > elf_file_size) {
fprintf(stderr, "termux-elf-cleaner: Elf header for '%s' would end at %zu but file size only %zu\n", file_name, sizeof(ElfSectionHeaderType), elf_file_size);
return false;
}
ElfHeaderType* elf_hdr = reinterpret_cast<ElfHeaderType*>(bytes);
size_t last_section_header_byte = elf_hdr->e_shoff + sizeof(ElfSectionHeaderType) * elf_hdr->e_shnum;
if (last_section_header_byte > elf_file_size) {
fprintf(stderr, "termux-elf-cleaner: Section header for '%s' would end at %zu but file size only %zu\n", file_name, last_section_header_byte, elf_file_size);
return false;
}
ElfSectionHeaderType* section_header_table = reinterpret_cast<ElfSectionHeaderType*>(bytes + elf_hdr->e_shoff);
for (unsigned int i = 1; i < elf_hdr->e_shnum; i++) {
ElfSectionHeaderType* section_header_entry = section_header_table + i;
if (section_header_entry->sh_type == SHT_DYNAMIC) {
size_t const last_dynamic_section_byte = section_header_entry->sh_offset + section_header_entry->sh_size;
if (last_dynamic_section_byte > elf_file_size) {
fprintf(stderr, "termux-elf-cleaner: Dynamic section for '%s' would end at %zu but file size only %zu\n", file_name, last_dynamic_section_byte, elf_file_size);
return false;
}
size_t const dynamic_section_entries = section_header_entry->sh_size / sizeof(ElfDynamicSectionEntryType);
ElfDynamicSectionEntryType* const dynamic_section =
reinterpret_cast<ElfDynamicSectionEntryType*>(bytes + section_header_entry->sh_offset);
unsigned int last_nonnull_entry_idx = 0;
for (unsigned int j = dynamic_section_entries - 1; j > 0; j--) {
ElfDynamicSectionEntryType* dynamic_section_entry = dynamic_section + j;
if (dynamic_section_entry->d_tag != DT_NULL) {
last_nonnull_entry_idx = j;
break;
}
}
for (unsigned int j = 0; j < dynamic_section_entries; j++) {
ElfDynamicSectionEntryType* dynamic_section_entry = dynamic_section + j;
char const* removed_name = nullptr;
switch (dynamic_section_entry->d_tag) {
case DT_VERSYM: removed_name = "DT_VERSYM"; break;
case DT_VERNEEDED: removed_name = "DT_VERNEEDED"; break;
case DT_VERNEEDNUM: removed_name = "DT_VERNEEDNUM"; break;
case DT_VERDEF: removed_name = "DT_VERDEF"; break;
case DT_VERDEFNUM: removed_name = "DT_VERDEFNUM"; break;
case DT_RPATH: removed_name = "DT_RPATH"; break;
case DT_RUNPATH: removed_name = "DT_RUNPATH"; break;
}
if (removed_name != nullptr) {
printf("termux-elf-cleaner: Removing the %s dynamic section entry from '%s'\n", removed_name, file_name);
// Tag the entry with DT_NULL and put it last:
dynamic_section_entry->d_tag = DT_NULL;
// Decrease j to process new entry index:
std::swap(dynamic_section[j--], dynamic_section[last_nonnull_entry_idx--]);
}
}
} else if (section_header_entry->sh_type == SHT_GNU_verdef ||
section_header_entry->sh_type == SHT_GNU_verneed ||
section_header_entry->sh_type == SHT_GNU_versym) {
printf("termux-elf-cleaner: Removing version section from '%s'\n", file_name);
section_header_entry->sh_type = SHT_NULL;
}
}
return true;
}
int main(int argc, char const** argv)
{
if (argc < 2 || (argc == 2 && strcmp(argv[1], "-h")==0)) {
fprintf(stderr, "usage: %s <filename>\n", argv[0]);
fprintf(stderr, " Processes ELF files to remove DT_VERNEEDED, DT_VERNEEDNUM, DT_RPATH\n"
" and DT_RUNPATH entries (which the Android linker warns about)\n");
return 1;
}
for (int i = 1; i < argc; i++) {
char const* file_name = argv[i];
int fd = open(file_name, O_RDWR);
if (fd < 0) {
char* error_message;
if (asprintf(&error_message, "open(\"%s\")", file_name) == -1) error_message = (char*) "open()";
perror(error_message);
return 1;
}
struct stat st;
if (fstat(fd, &st) < 0) { perror("fstat()"); return 1; }
if (st.st_size < (long long) sizeof(Elf32_Ehdr)) {
close(fd);
continue;
}
void* mem = mmap(0, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mem == MAP_FAILED) { perror("mmap()"); return 1; }
uint8_t* bytes = reinterpret_cast<uint8_t*>(mem);
if (!(bytes[0] == 0x7F && bytes[1] == 'E' && bytes[2] == 'L' && bytes[3] == 'F')) {
// Not the ELF magic number.
munmap(mem, st.st_size);
close(fd);
continue;
}
if (bytes[/*EI_DATA*/5] != 1) {
fprintf(stderr, "termux-elf-cleaner: Not little endianness in '%s'\n", file_name);
munmap(mem, st.st_size);
close(fd);
continue;
}
uint8_t const bit_value = bytes[/*EI_CLASS*/4];
if (bit_value == 1) {
if (!process_elf<Elf32_Ehdr, Elf32_Shdr, Elf32_Dyn>(bytes, st.st_size, file_name)) return 1;
} else if (bit_value == 2) {
if (!process_elf<Elf64_Ehdr, Elf64_Shdr, Elf64_Dyn>(bytes, st.st_size, file_name)) return 1;
} else {
printf("termux-elf-cleaner: Incorrect bit value %d in '%s'\n", bit_value, file_name);
return 1;
}
if (msync(mem, st.st_size, MS_SYNC) < 0) { perror("msync()"); return 1; }
munmap(mem, st.st_size);
close(fd);
}
return 0;
}
Write Preview
Loading…
Cancel
Save