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// SPDX-License-Identifier: GPLv2
/*
* pe_allocspace.c - allocate space in the PE binary
* Copyright Peter Jones <pjones@redhat.com>
* Copyright Red Hat, Inc.
*/
#include "libdpe_priv.h"
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#define adjust(x,y) ((x) = (typeof (x))(((uint8_t *)(x)) + (y)))
static void
pe_fix_addresses(Pe *pe, int64_t offset)
{
pe->map_address += offset;
adjust(pe->state.pe.mzhdr, offset);
adjust(pe->state.pe.pehdr, offset);
adjust(pe->state.pe.reserved0, offset);
adjust(pe->state.pe.reserved1, offset);
adjust(pe->state.pe.shdr, offset);
size_t scncnt = get_shnum(pe->map_address, pe->maximum_size);
/* in general this means we couldn't identify any sections, so
* they must not need to be fixed up. */
if (scncnt == (size_t)-1l)
return;
for (size_t cnt = 0; cnt < scncnt; cnt++) {
pe->state.pe.scns.data[cnt].shdr =
&pe->state.pe.shdr[cnt];
adjust(pe->state.pe.scns.data[cnt].rawdata_base, offset);
adjust(pe->state.pe.scns.data[cnt].data_base, offset);
}
}
#undef adjust
#define align(val, align) (((val) + (align) -1 ) & (- (align)))
int
pe_set_image_size(Pe *pe)
{
if (!pe) {
errno = EINVAL;
return -1;
}
uint32_t image_size = 0;
struct pe_hdr *pehdr = pe->state.pe.pehdr;
struct pe32plus_opt_hdr *opthdr = pe->state.pe32plus_exe.opthdr;
Pe_Scn *scn = NULL;
struct section_header shdr = { "", 0, }, tmp_shdr;
if (pehdr->sections < 1)
return -1;
for (int i = 0; i < pehdr->sections; i++) {
scn = pe_nextscn(pe, scn);
if (scn == NULL)
break;
pe_getshdr(scn, &tmp_shdr);
if (tmp_shdr.virtual_size > 0)
memcpy (&shdr, &tmp_shdr, sizeof(shdr));
}
int falign = pe_get_file_alignment(pe);
int salign = pe_get_scn_alignment(pe);
image_size = shdr.virtual_address - opthdr->image_base +
align(align(shdr.virtual_size, falign), salign);
pe->state.pe32plus_exe.opthdr->image_size = image_size;
return 0;
}
int
pe_extend_file(Pe *pe, size_t size, uint32_t *new_space, int align)
{
if (!pe) {
errno = EINVAL;
return -1;
}
void *new = NULL;
if (align)
align = ALIGNMENT_PADDING(pe->maximum_size, align);
int extra = size + align;
int rc = ftruncate(pe->fildes, pe->maximum_size + extra);
if (rc < 0)
return -1;
new = mremap(pe->map_address, pe->maximum_size,
pe->maximum_size + extra, MREMAP_MAYMOVE);
if (new == MAP_FAILED) {
__libpe_seterrno (PE_E_NOMEM);
return -1;
}
if (new != pe->map_address)
pe_fix_addresses(pe, (uint8_t *)new-(uint8_t *)pe->map_address);
char *addr = compute_mem_addr(pe, pe->maximum_size);
memset(addr, '\0', extra);
*new_space = compute_file_addr(pe, addr + align);
pe->maximum_size = pe->maximum_size + extra;
return 0;
}
int
pe_shorten_file(Pe *pe, size_t size)
{
void *new = NULL;
if (!pe) {
errno = EINVAL;
return -1;
}
new = mremap(pe->map_address, pe->maximum_size,
pe->maximum_size - size, 0);
if (new == MAP_FAILED) {
__libpe_seterrno (PE_E_NOMEM);
return -1;
}
int rc = ftruncate(pe->fildes, pe->maximum_size - size);
if (rc < 0)
return -1;
pe->maximum_size -= size;
return 0;
}
int
pe_freespace(Pe *pe, uint32_t offset, size_t size)
{
if (!pe) {
errno = EINVAL;
return -1;
}
void *addr = compute_mem_addr(pe, offset);
memset(addr, '\0', size);
if (offset + size == pe->maximum_size)
pe_shorten_file(pe, size);
/* XXX PJFIX TODO: this should actually de-allocate the space, *if*
* it's the certificate list, when it isn't at the end of the file,
* too. */
return 0;
}
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