termux-elf-cleaner: Move to standalone repo
This commit is contained in:
Fredrik Fornwall
parent
37cc7f1eec
commit
d2c4f7c6e0
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@ -1,7 +1,7 @@
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TERMUX_PKG_HOMEPAGE=https://termux.com/
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TERMUX_PKG_HOMEPAGE=https://github.com/termux/termux-elf-cleaner
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TERMUX_PKG_DESCRIPTION="Cleaner of ELF files for Android"
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TERMUX_PKG_VERSION=1.1
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termux_step_make_install () {
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$CXX $CFLAGS $LDFLAGS -std=c++14 -Wall -Wextra -pedantic -Werror $TERMUX_PKG_BUILDER_DIR/*.cpp -o $TERMUX_PREFIX/bin/termux-elf-cleaner
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}
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TERMUX_PKG_SRCURL=https://github.com/termux/termux-elf-cleaner/archive/v${TERMUX_PKG_VERSION}.tar.gz
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TERMUX_PKG_SHA256=66612b294e197ab7bfac807e497581df58424af6a7c855f89fc12eafa3dc1b8c
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TERMUX_PKG_FOLDERNAME=termux-elf-cleaner-$TERMUX_PKG_VERSION
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TERMUX_PKG_BUILD_IN_SRC=yes
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@ -1,211 +0,0 @@
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#ifndef ELF_H_INCLUDED
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#define ELF_H_INCLUDED
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#include <stdint.h>
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/* Type for a 16-bit quantity. */
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typedef uint16_t Elf32_Half;
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typedef uint16_t Elf64_Half;
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/* Types for signed and unsigned 32-bit quantities. */
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typedef uint32_t Elf32_Word;
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typedef int32_t Elf32_Sword;
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typedef uint32_t Elf64_Word;
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typedef int32_t Elf64_Sword;
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/* Types for signed and unsigned 64-bit quantities. */
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typedef uint64_t Elf32_Xword;
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typedef int64_t Elf32_Sxword;
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typedef uint64_t Elf64_Xword;
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typedef int64_t Elf64_Sxword;
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/* Type of addresses. */
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typedef uint32_t Elf32_Addr;
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typedef uint64_t Elf64_Addr;
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/* Type of file offsets. */
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typedef uint32_t Elf32_Off;
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typedef uint64_t Elf64_Off;
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/* Type for section indices, which are 16-bit quantities. */
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typedef uint16_t Elf32_Section;
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typedef uint16_t Elf64_Section;
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/* Type for version symbol information. */
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typedef Elf32_Half Elf32_Versym;
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typedef Elf64_Half Elf64_Versym;
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/* The ELF file header. This appears at the start of every ELF file. */
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typedef struct {
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unsigned char e_ident[16]; /* Magic number and other info */
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Elf32_Half e_type; /* Object file type */
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Elf32_Half e_machine; /* Architecture */
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Elf32_Word e_version; /* Object file version */
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Elf32_Addr e_entry; /* Entry point virtual address */
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Elf32_Off e_phoff; /* Program header table (usually follows elf header directly) file offset */
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Elf32_Off e_shoff; /* Section header table (at end of file) file offset */
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Elf32_Word e_flags; /* Processor-specific flags */
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Elf32_Half e_ehsize; /* ELF header size in bytes */
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Elf32_Half e_phentsize; /* Program header table entry size */
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Elf32_Half e_phnum; /* Program header table entry count */
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Elf32_Half e_shentsize; /* Section header table entry size */
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Elf32_Half e_shnum; /* Section header table entry count */
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Elf32_Half e_shstrndx; /* Section header string table index */
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} Elf32_Ehdr;
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typedef struct {
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unsigned char e_ident[16]; /* Magic number and other info */
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Elf64_Half e_type; /* Object file type */
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Elf64_Half e_machine; /* Architecture */
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Elf64_Word e_version; /* Object file version */
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Elf64_Addr e_entry; /* Entry point virtual address */
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Elf64_Off e_phoff; /* Program header table file offset */
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Elf64_Off e_shoff; /* Section header table file offset */
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Elf64_Word e_flags; /* Processor-specific flags */
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Elf64_Half e_ehsize; /* ELF header size in bytes */
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Elf64_Half e_phentsize; /* Program header table entry size */
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Elf64_Half e_phnum; /* Program header table entry count */
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Elf64_Half e_shentsize; /* Section header table entry size */
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Elf64_Half e_shnum; /* Section header table entry count */
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Elf64_Half e_shstrndx; /* Section header string table index */
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} Elf64_Ehdr;
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/* Section header entry. The number of section entries in the file are determined by the "e_shnum" field of the ELF header.*/
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typedef struct {
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Elf32_Word sh_name; /* Section name (string tbl index) */
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Elf32_Word sh_type; /* Section type */
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Elf32_Word sh_flags; /* Section flags */
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Elf32_Addr sh_addr; /* Section virtual addr at execution */
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Elf32_Off sh_offset; /* Section file offset */
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Elf32_Word sh_size; /* Section size in bytes */
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Elf32_Word sh_link; /* Link to another section */
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Elf32_Word sh_info; /* Additional section information */
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Elf32_Word sh_addralign; /* Section alignment */
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Elf32_Word sh_entsize; /* Entry size if section holds table */
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} Elf32_Shdr;
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typedef struct {
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Elf64_Word sh_name; /* Section name (string tbl index) */
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Elf64_Word sh_type; /* Section type */
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Elf64_Xword sh_flags; /* Section flags */
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Elf64_Addr sh_addr; /* Section virtual addr at execution */
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Elf64_Off sh_offset; /* Section file offset */
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Elf64_Xword sh_size; /* Section size in bytes */
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Elf64_Word sh_link; /* Link to another section */
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Elf64_Word sh_info; /* Additional section information */
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Elf64_Xword sh_addralign; /* Section alignment */
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Elf64_Xword sh_entsize; /* Entry size if section holds table */
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} Elf64_Shdr;
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/* Legal values for sh_type (section type). */
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#define SHT_NULL 0 /* Section header table entry unused */
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#define SHT_PROGBITS 1 /* Program data */
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#define SHT_SYMTAB 2 /* Symbol table */
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#define SHT_STRTAB 3 /* String table */
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#define SHT_RELA 4 /* Relocation entries with addends */
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#define SHT_HASH 5 /* Symbol hash table */
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#define SHT_DYNAMIC 6 /* Dynamic linking information. Contains Elf32_Dyn/Elf64_Dyn entries. */
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#define SHT_NOTE 7 /* Notes */
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#define SHT_NOBITS 8 /* Program space with no data (bss) */
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#define SHT_REL 9 /* Relocation entries, no addends */
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#define SHT_SHLIB 10 /* Reserved */
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#define SHT_DYNSYM 11 /* Dynamic linker symbol table */
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#define SHT_INIT_ARRAY 14 /* Array of constructors */
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#define SHT_FINI_ARRAY 15 /* Array of destructors */
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#define SHT_PREINIT_ARRAY 16 /* Array of pre-constructors */
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#define SHT_GROUP 17 /* Section group */
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#define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */
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#define SHT_NUM 19 /* Number of defined types. */
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#define SHT_LOOS 0x60000000 /* Start OS-specific. */
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#define SHT_GNU_ATTRIBUTES 0x6ffffff5 /* Object attributes. */
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#define SHT_GNU_HASH 0x6ffffff6 /* GNU-style hash table. */
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#define SHT_GNU_LIBLIST 0x6ffffff7 /* Prelink library list */
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#define SHT_CHECKSUM 0x6ffffff8 /* Checksum for DSO content. */
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#define SHT_LOSUNW 0x6ffffffa /* Sun-specific low bound. */
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#define SHT_SUNW_move 0x6ffffffa
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#define SHT_SUNW_COMDAT 0x6ffffffb
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#define SHT_SUNW_syminfo 0x6ffffffc
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#define SHT_GNU_verdef 0x6ffffffd /* Version definition section. */
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#define SHT_GNU_verneed 0x6ffffffe /* Version needs section. */
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#define SHT_GNU_versym 0x6fffffff /* Version symbol table. */
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#define SHT_HISUNW 0x6fffffff /* Sun-specific high bound. */
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#define SHT_HIOS 0x6fffffff /* End OS-specific type */
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#define SHT_LOPROC 0x70000000 /* Start of processor-specific */
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#define SHT_HIPROC 0x7fffffff /* End of processor-specific */
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#define SHT_LOUSER 0x80000000 /* Start of application-specific */
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#define SHT_HIUSER 0x8fffffff /* End of application-specific */
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/* Dynamic section entry. */
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typedef struct {
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Elf32_Sword d_tag; /* Dynamic entry type */
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union { Elf32_Word d_val; Elf32_Addr d_ptr; } d_un; /* Integer or address value */
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} Elf32_Dyn;
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typedef struct {
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Elf64_Sxword d_tag; /* Dynamic entry type */
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union { Elf64_Xword d_val; Elf64_Addr d_ptr; } d_un; /* Integer or address value */
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} Elf64_Dyn;
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/* Legal values for d_tag (dynamic entry type). */
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#define DT_NULL 0 /* Marks end of dynamic section */
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#define DT_NEEDED 1 /* Name of needed library */
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#define DT_PLTRELSZ 2 /* Size in bytes of PLT relocs */
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#define DT_PLTGOT 3 /* Processor defined value */
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#define DT_HASH 4 /* Address of symbol hash table */
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#define DT_STRTAB 5 /* Address of string table */
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#define DT_SYMTAB 6 /* Address of symbol table */
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#define DT_RELA 7 /* Address of Rela relocs */
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#define DT_RELASZ 8 /* Total size of Rela relocs */
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#define DT_RELAENT 9 /* Size of one Rela reloc */
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#define DT_STRSZ 10 /* Size of string table */
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#define DT_SYMENT 11 /* Size of one symbol table entry */
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#define DT_INIT 12 /* Address of init function */
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#define DT_FINI 13 /* Address of termination function */
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#define DT_SONAME 14 /* Name of shared object */
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#define DT_RPATH 15 /* Library search path (deprecated) */
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#define DT_SYMBOLIC 16 /* Start symbol search here */
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#define DT_REL 17 /* Address of Rel relocs */
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#define DT_RELSZ 18 /* Total size of Rel relocs */
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#define DT_RELENT 19 /* Size of one Rel reloc */
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#define DT_PLTREL 20 /* Type of reloc in PLT */
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#define DT_DEBUG 21 /* For debugging; unspecified */
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#define DT_TEXTREL 22 /* Reloc might modify .text */
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#define DT_JMPREL 23 /* Address of PLT relocs */
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#define DT_BIND_NOW 24 /* Process relocations of object */
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#define DT_INIT_ARRAY 25 /* Array with addresses of init fct */
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#define DT_FINI_ARRAY 26 /* Array with addresses of fini fct */
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#define DT_INIT_ARRAYSZ 27 /* Size in bytes of DT_INIT_ARRAY */
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#define DT_FINI_ARRAYSZ 28 /* Size in bytes of DT_FINI_ARRAY */
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#define DT_RUNPATH 29 /* Library search path */
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#define DT_FLAGS 30 /* Flags for the object being loaded */
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#define DT_ENCODING 32 /* Start of encoded range */
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#define DT_PREINIT_ARRAY 32 /* Array with addresses of preinit fct*/
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#define DT_PREINIT_ARRAYSZ 33 /* size in bytes of DT_PREINIT_ARRAY */
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#define DT_NUM 34 /* Number used */
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#define DT_LOOS 0x6000000d /* Start of OS-specific */
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#define DT_HIOS 0x6ffff000 /* End of OS-specific */
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#define DT_VERDEF 0x6ffffffc
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#define DT_VERDEFNUM 0x6ffffffd
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#define DT_LOPROC 0x70000000 /* Start of processor-specific */
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#define DT_HIPROC 0x7fffffff /* End of processor-specific */
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/* Symbol table entry. */
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typedef struct {
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Elf32_Word st_name; /* Symbol name (string tbl index) */
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Elf32_Addr st_value; /* Symbol value */
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Elf32_Word st_size; /* Symbol size */
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unsigned char st_info; /* Symbol type and binding */
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unsigned char st_other; /* Symbol visibility */
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Elf32_Section st_shndx; /* Section index */
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} Elf32_Sym;
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typedef struct {
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Elf64_Word st_name; /* Symbol name (string tbl index) */
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unsigned char st_info; /* Symbol type and binding */
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unsigned char st_other; /* Symbol visibility */
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Elf64_Section st_shndx; /* Section index */
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Elf64_Addr st_value; /* Symbol value */
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Elf64_Xword st_size; /* Symbol size */
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} Elf64_Sym;
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#endif
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@ -1,154 +0,0 @@
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#include <algorithm>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#ifdef __APPLE__
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# include "elf.h"
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#else
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# include <elf.h>
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#endif
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#define DT_VERSYM 0x6ffffff0
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#define DT_VERNEEDED 0x6ffffffe
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#define DT_VERNEEDNUM 0x6fffffff
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template<typename ElfHeaderType /*Elf{32,64}_Ehdr*/,
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typename ElfSectionHeaderType /*Elf{32,64}_Shdr*/,
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typename ElfDynamicSectionEntryType /* Elf{32,64}_Dyn */>
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bool process_elf(uint8_t* bytes, size_t elf_file_size, char const* file_name)
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{
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if (sizeof(ElfSectionHeaderType) > elf_file_size) {
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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);
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return false;
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}
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ElfHeaderType* elf_hdr = reinterpret_cast<ElfHeaderType*>(bytes);
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size_t last_section_header_byte = elf_hdr->e_shoff + sizeof(ElfSectionHeaderType) * elf_hdr->e_shnum;
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if (last_section_header_byte > elf_file_size) {
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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);
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return false;
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}
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ElfSectionHeaderType* section_header_table = reinterpret_cast<ElfSectionHeaderType*>(bytes + elf_hdr->e_shoff);
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for (unsigned int i = 1; i < elf_hdr->e_shnum; i++) {
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ElfSectionHeaderType* section_header_entry = section_header_table + i;
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if (section_header_entry->sh_type == SHT_DYNAMIC) {
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size_t const last_dynamic_section_byte = section_header_entry->sh_offset + section_header_entry->sh_size;
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if (last_dynamic_section_byte > elf_file_size) {
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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);
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return false;
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}
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size_t const dynamic_section_entries = section_header_entry->sh_size / sizeof(ElfDynamicSectionEntryType);
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ElfDynamicSectionEntryType* const dynamic_section =
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reinterpret_cast<ElfDynamicSectionEntryType*>(bytes + section_header_entry->sh_offset);
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unsigned int last_nonnull_entry_idx = 0;
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for (unsigned int j = dynamic_section_entries - 1; j > 0; j--) {
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ElfDynamicSectionEntryType* dynamic_section_entry = dynamic_section + j;
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if (dynamic_section_entry->d_tag != DT_NULL) {
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last_nonnull_entry_idx = j;
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break;
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}
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}
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for (unsigned int j = 0; j < dynamic_section_entries; j++) {
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ElfDynamicSectionEntryType* dynamic_section_entry = dynamic_section + j;
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char const* removed_name = nullptr;
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switch (dynamic_section_entry->d_tag) {
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case DT_VERSYM: removed_name = "DT_VERSYM"; break;
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case DT_VERNEEDED: removed_name = "DT_VERNEEDED"; break;
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case DT_VERNEEDNUM: removed_name = "DT_VERNEEDNUM"; break;
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case DT_VERDEF: removed_name = "DT_VERDEF"; break;
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case DT_VERDEFNUM: removed_name = "DT_VERDEFNUM"; break;
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case DT_RPATH: removed_name = "DT_RPATH"; break;
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case DT_RUNPATH: removed_name = "DT_RUNPATH"; break;
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}
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if (removed_name != nullptr) {
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printf("termux-elf-cleaner: Removing the %s dynamic section entry from '%s'\n", removed_name, file_name);
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// Tag the entry with DT_NULL and put it last:
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dynamic_section_entry->d_tag = DT_NULL;
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// Decrease j to process new entry index:
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std::swap(dynamic_section[j--], dynamic_section[last_nonnull_entry_idx--]);
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}
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}
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} else if (section_header_entry->sh_type == SHT_GNU_verdef ||
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section_header_entry->sh_type == SHT_GNU_verneed ||
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section_header_entry->sh_type == SHT_GNU_versym) {
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printf("termux-elf-cleaner: Removing version section from '%s'\n", file_name);
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section_header_entry->sh_type = SHT_NULL;
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}
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}
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return true;
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}
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int main(int argc, char const** argv)
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{
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if (argc < 2 || (argc == 2 && strcmp(argv[1], "-h")==0)) {
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fprintf(stderr, "usage: %s <filename>\n", argv[0]);
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fprintf(stderr, " Processes ELF files to remove DT_VERNEEDED, DT_VERNEEDNUM, DT_RPATH\n"
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" and DT_RUNPATH entries (which the Android linker warns about)\n");
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return 1;
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}
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for (int i = 1; i < argc; i++) {
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char const* file_name = argv[i];
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int fd = open(file_name, O_RDWR);
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if (fd < 0) {
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char* error_message;
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if (asprintf(&error_message, "open(\"%s\")", file_name) == -1) error_message = (char*) "open()";
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perror(error_message);
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return 1;
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}
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struct stat st;
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if (fstat(fd, &st) < 0) { perror("fstat()"); return 1; }
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if (st.st_size < (long long) sizeof(Elf32_Ehdr)) {
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close(fd);
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continue;
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}
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void* mem = mmap(0, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (mem == MAP_FAILED) { perror("mmap()"); return 1; }
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uint8_t* bytes = reinterpret_cast<uint8_t*>(mem);
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if (!(bytes[0] == 0x7F && bytes[1] == 'E' && bytes[2] == 'L' && bytes[3] == 'F')) {
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// Not the ELF magic number.
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munmap(mem, st.st_size);
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close(fd);
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continue;
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}
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if (bytes[/*EI_DATA*/5] != 1) {
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fprintf(stderr, "termux-elf-cleaner: Not little endianness in '%s'\n", file_name);
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munmap(mem, st.st_size);
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close(fd);
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continue;
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}
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uint8_t const bit_value = bytes[/*EI_CLASS*/4];
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if (bit_value == 1) {
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if (!process_elf<Elf32_Ehdr, Elf32_Shdr, Elf32_Dyn>(bytes, st.st_size, file_name)) return 1;
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} else if (bit_value == 2) {
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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;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue