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Put upx stub loader at high end of ELF output file on linux,

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and allow for block-by-block specification of filter and parameters.
	linker.cpp linker.h mem.cpp mem.h p_elf.h
	p_lx_elf.cpp p_lx_elf.h
	p_lx_exc.cpp p_lx_exc.h
	p_lx_sh.cpp  p_lx_sh.h
	p_unix.cpp p_unix.h
	packer.cpp packer.h
	stub/fold_elf86.asm stub/fold_exec86.asm stub/fold_sh86.asm
	stub/l_lx_elf.c  stub/l_lx_elf86.asm  stub/l_lx_elf86.lds
	stub/l_lx_exec.c stub/l_lx_exec86.asm stub/l_lx_exec86.lds
	stub/l_lx_sh.c   stub/l_lx_sh86.asm   stub/l_lx_sh86.lds
	stub/linux.hh

committer: jreiser <jreiser> 981084316 +0000
This commit is contained in:
John Reiser
2001-02-02 03:25:16 +00:00
parent 9005e50049
commit 40fddf1715
28 changed files with 797 additions and 614 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/stub/l_lx_sh.c
+18 -35
View File
@@ -114,10 +114,7 @@ unpackExtent(
)
{
while (xo->size) {
struct {
int32_t sz_unc; // uncompressed
int32_t sz_cpr; // compressed
} h;
struct b_info h;
// Note: if h.sz_unc == h.sz_cpr then the block was not
// compressible and is stored in its uncompressed form.
@@ -135,7 +132,7 @@ unpackExtent(
ERR_LAB
}
if (h.sz_cpr > h.sz_unc
|| h.sz_unc > (int32_t)xo->size ) {
|| h.sz_unc > xo->size ) {
err_exit(5);
}
// Now we have:
@@ -272,48 +269,34 @@ ERR_LAB
**************************************************************************/
void *upx_main(
char *const uncbuf,
Elf32_Ehdr const *const my_ehdr,
f_expand *const f_decompress,
Elf32_auxv_t *const av,
Elf32_Ehdr *const ehdr
unsigned const junk,
f_expand *const f_decompress,
Elf32_Ehdr *const ehdr, // temp char[MAX_ELF_HDR]
struct Extent xi,
struct Extent xo
) __asm__("upx_main");
void *upx_main(
char *const uncbuf, // place to put decompressed shell script
Elf32_Ehdr const *const my_ehdr, // to get compressed size and data
f_expand *const f_decompress,
Elf32_auxv_t *const av,
Elf32_Ehdr *const ehdr // temp char[MAX_ELF_HDR]
unsigned const junk,
f_expand *const f_decompress,
Elf32_Ehdr *const ehdr, // temp char[MAX_ELF_HDR]
struct Extent xi,
struct Extent xo
)
{
// 'fn' and 'efn' must not suffer constant-propagation by gcc
// UPX2 = offset to name_of_shell
// UPX3 = strlen(name_of_shell)
char * /*const*/ volatile fn = UPX2 + xo.buf; // past "-c" and "#!"
char * /*const*/ volatile efn = UPX3 + fn; // &terminator
Elf32_Addr entry;
size_t const lsize = sizeof(struct p_info) +
*(unsigned short const *)(0x7c + (char const *)my_ehdr);
struct Extent xi = { // describe compressed shell script
((Elf32_Phdr const *)(1 + my_ehdr))->p_filesz - lsize,
lsize + CONST_CAST(char *, my_ehdr)
};
struct Extent xo = { ((struct p_info *)xi.buf)[-1].p_filesize, uncbuf };
// Allocate space for decompressed shell script.
// "1+": guarantee '\0' terminator at end of decompressed script
if (xo.buf != do_mmap(xo.buf, 1+3+xo.size, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, 0, 0)) {
err_exit(20);
ERR_LAB
}
// Uncompress shell script
xo.buf += 3; // leave room for "-c" argument
(void)junk;
unpackExtent(&xi, &xo, f_decompress);
{ // Map shell program
// 'fn' and 'efn' must not suffer constant-propagation by gcc
// UPX2 = 3 + offset to name_of_shell
// UPX3 = strlen(name_of_shell)
char * /*const*/ volatile fn = UPX2 + uncbuf; // past "-c" and "#!"
char * /*const*/ volatile efn = UPX3 + fn; // &terminator
char const c = *efn; *efn = 0; // terminator
entry = getexec(fn, ehdr, av);
*efn = c; // replace terminator character