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Evade poratbility constraints of UPX build system
when building a tool to investigate "minimal" Mach-O executable on Apple MacOS Big Sur using Apple M1 hardware (aarch64). https://github.com/upx/upx/issues/567 modified: stub/tools/macho-snip/Makefile modified: stub/tools/macho-snip/macho-snip.c modified: stub/tools/macho-snip/udf.s
This commit is contained in:
John Reiser
Markus F.X.J. Oberhumer
parent
972c76eb42
commit
480ab51650
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@ -8,13 +8,13 @@
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CFLAGS += -g
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macho-snip: macho-snip.o udf
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macho-snip: macho-snip.o
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$(CC) $(CFLAGS) -o macho-snip macho-snip.o
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udf.o: udf.s
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gcc -c $<
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# shortest main program; used as an example
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# shortest main program; used as an example for Apple Mach-O
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udf: udf.o
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gcc --verbose -nostartfiles -o udf $<
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codesign --remove-signature udf
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@ -11,9 +11,138 @@
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#include <fcntl.h>
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#include <sys/mman.h>
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#ifdef __APPLE__ //{
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// /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/mach-o/loader.h
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#include <mach-o/loader.h>
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#include <mach-o/nlist.h>
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#else //}{
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enum { // cmd
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LC_REQ_DYLD = 0x80000000, // OR'ed ==> must not ignore
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LC_SEGMENT = 0x1,
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LC_SYMTAB = 0x2,
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LC_THREAD = 0x4,
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LC_UNIXTHREAD = 0x5,
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LC_DYSYMTAB = 0xb,
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LC_LOAD_DYLIB = 0xc,
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LC_ID_DYLIB = 0xd,
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LC_LOAD_DYLINKER = 0xe,
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LC_ID_DYLINKER = 0xf,
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LC_ROUTINES = 0x11,
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LC_TWOLEVEL_HINTS= 0x16,
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LC_LOAD_WEAK_DYLIB= (0x18 | LC_REQ_DYLD),
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LC_SEGMENT_64 = 0x19,
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LC_ROUTINES_64 = 0x1a,
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LC_UUID = 0x1b,
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LC_RPATH = 0x1c,
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LC_CODE_SIGNATURE = 0x1d,
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LC_SEGMENT_SPLIT_INFO = 0x1e,
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LC_REEXPORT_DYLIB = (0x1f | LC_REQ_DYLD),
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LC_LAZY_LOAD_DYLIB= 0x20,
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LC_ENCRYPTION_INFO= 0x21,
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LC_DYLD_INFO = 0x22, // compressed dyld information (10.6.x)
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LC_DYLD_INFO_ONLY = (0x22|LC_REQ_DYLD),
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LC_VERSION_MIN_MACOSX= 0x24,
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LC_VERSION_MIN_IPHONEOS= 0x25,
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LC_FUNCTION_STARTS= 0x26,
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LC_DYLD_ENVIRONMENT= 0x27, // string as environment variable
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LC_MAIN = (0x28|LC_REQ_DYLD),
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LC_DATA_IN_CODE = 0x29,
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LC_SOURCE_VERSION = 0x2a,
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LC_DYLIB_CODE_SIGN_DRS= 0x2B,
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LC_ENCRYPTION_INFO_64= 0x2C,
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LC_LINKER_OPTIMIZATION_HINT = 0x2E,
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LC_VERSION_MIN_TVOS= 0x2F,
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LC_VERSION_MIN_WATCHOS= 0x30,
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LC_NOTE = 0x31,
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LC_BUILD_VERSION = 0x32,
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LC_DYLD_EXPORTS_TRIE = (0x33|LC_REQ_DYLD),
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LC_DYLD_CHAINED_FIXUPS = (0x34|LC_REQ_DYLD),
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LC_FILESET_ENTRY = (0x35|LC_REQ_DYLD),
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};
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#include <stdint.h>
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struct mach_header_64 {
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uint32_t magic;
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uint32_t cputype;
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uint32_t cpusubtype;
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uint32_t filetype;
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uint32_t ncmds;
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uint32_t sizeofcmds;
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uint32_t flags;
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uint32_t reserved;
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};
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struct load_command {
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uint32_t cmd;
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uint32_t cmdsize;
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};
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struct segment_command_64 {
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uint32_t cmd;
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uint32_t cmdsize;
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char segname[16];
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uint64_t vmaddr;
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uint64_t vmsize;
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uint64_t fileoff;
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uint64_t filesize;
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uint32_t maxprot;
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uint32_t initprot;
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uint32_t nsects;
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uint32_t flags;
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};
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struct linkedit_data_command {
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uint32_t cmd;
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uint32_t cmdsize;
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uint32_t dataoff;
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uint32_t datasize;
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};
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struct symtab_command {
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uint32_t cmd;
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uint32_t cmdsize;
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uint32_t symoff;
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uint32_t nsyms;
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uint32_t stroff;
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uint32_t strsize;
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};
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struct dysymtab_command {
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uint32_t cmd;
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uint32_t cmdsize;
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uint32_t ilocalsym;
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uint32_t nlocalsym;
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uint32_t iextdefsym;
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uint32_t nextdefsym;
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uint32_t iundefsym;
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uint32_t nundefsym;
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uint32_t tocoff;
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uint32_t ntoc;
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uint32_t modtaboff;
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uint32_t nmodtab;
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uint32_t extrefsymoff;
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uint32_t nextrefsyms;
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uint32_t indirectsymoff;
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uint32_t nindirectsyms;
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uint32_t extreloff;
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uint32_t nextrel;
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uint32_t locreloff;
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uint32_t nlocrel;
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};
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struct nlist_64 {
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union {
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uint32_t n_strx;
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} n_un;
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uint8_t n_type;
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uint8_t n_sect;
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uint16_t n_desc;
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uint64_t n_value;
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};
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#endif //}
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struct Cmd_names {
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unsigned char val;
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@ -64,7 +193,9 @@ struct Cmd_names {
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// Try to enable success of running "codesign -s - file" afterwards.
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// Note that LC_CODE_SIGNATURE should be removed before snipping:
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// codesign --remove-signature file
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//
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// This is EXPERIMENTAL to aid in finding a "minimal" executable
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// on Apple MacOS Big Sur, particularly Apple M1 hardware (aarch64).
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int
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main(int argc, char const * /*const*/ *const argv, char const *const *const envp)
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{
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@ -1,4 +1,9 @@
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.align 4
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// start: .globl start // for standalone
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_main: .globl _main // for -lc
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udf 123
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.align 4
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// start: .globl start # for standalone
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_main: .globl _main # for -lc
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#ifdef __x86_64__
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ud2
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#endif
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#ifdef __AARCH64EL__
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.int 0x7b # udf 123
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#endif
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