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filters for linux/elf386;

Browse Source 
filter.cpp filter.h p_lx_elf.cpp p_lx_elf.h filter/ctojr.h
	stub/l_lx_elf.c stub/l_lx_elf86.asm

committer: jreiser <jreiser> 978846586 +0000
This commit is contained in:
John Reiser
2001-01-07 05:49:46 +00:00
parent 4d2b35c9ee
commit ce1b58d293
7 changed files with 206 additions and 17 deletions
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src/stub/l_lx_elf.c
+13 -3
View File
@@ -102,6 +102,7 @@ do_mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset)
// UPX & NRV stuff
**************************************************************************/
typedef void f_unfilter(nrv_byte *, nrv_uint); // 1st param is also addvalue
typedef int f_expand(
const nrv_byte *, nrv_uint,
nrv_byte *, nrv_uint * );
@@ -110,7 +111,8 @@ static void
unpackExtent(
struct Extent *const xi, // input
struct Extent *const xo, // output
f_expand *const f_decompress
f_expand *const f_decompress,
f_unfilter *f_unf
)
{
while (xo->size) {
@@ -148,6 +150,13 @@ ERR_LAB
int const j = (*f_decompress)(xi->buf, h.sz_cpr, xo->buf, &out_len);
if (j != 0 || out_len != (nrv_uint)h.sz_unc)
err_exit(7);
// Skip Ehdr+Phdrs: separate 1st block, not filtered
if (f_unf // have filter
&& ((512 < out_len) // this block is longer than Ehdr+Phdrs
|| (xo->size==(unsigned)h.sz_unc) ) // block is last in Extent
) {
(*f_unf)(xo->buf, out_len);
}
xi->buf += h.sz_cpr;
xi->size -= h.sz_cpr;
}
@@ -241,7 +250,8 @@ do_xmap(int const fdi, Elf32_Ehdr const *const ehdr, struct Extent *const xi,
base = (unsigned long)addr;
}
if (xi) {
unpackExtent(xi, &xo, (f_expand *)fdi);
unpackExtent(xi, &xo, (f_expand *)fdi,
((phdr->p_flags & PF_X) ? (f_unfilter *)(2+ fdi) : 0));
}
bzero(addr, frag); // fragment at lo end
frag = (-mlen) &~ PAGE_MASK; // distance to next page boundary
@@ -333,7 +343,7 @@ void *upx_main(
// Uncompress Ehdr and Phdrs.
xo.size = sz_elfhdrs; xo.buf = (char *)ehdr;
xi.size = 2*sizeof(size_t) + sz_pckhdrs;
unpackExtent(&xi, &xo, f_decompress);
unpackExtent(&xi, &xo, f_decompress, 0);
// Prepare to decompress the Elf headers again, into the first PT_LOAD.
xi.buf -= 2*sizeof(size_t) + sz_pckhdrs;