int pt_sec_posix_map(struct pt_section *section, int fd)
{
struct pt_sec_posix_mapping *mapping;
uint64_t offset, size, adjustment;
uint8_t *base;
if (!section)
return -pte_internal;
offset = section->offset;
size = section->size;
adjustment = offset % PAGE_SIZE;
offset -= adjustment;
size += adjustment;
/* The section is supposed to fit into the file so we shouldn't
* see any overflows, here.
*/
if (size < section->size)
return -pte_internal;
base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, offset);
if (base == MAP_FAILED)
return -pte_nomem;
mapping = malloc(sizeof(*mapping));
if (!mapping)
goto out_map;
mapping->base = base;
mapping->size = size;
mapping->begin = base + adjustment;
mapping->end = base + size;
section->mapping = mapping;
section->unmap = pt_sec_posix_unmap;
section->read = pt_sec_posix_read;
return pt_section_add_bcache(section);
out_map:
munmap(base, size);
return -pte_nomem;
}
int pt_sec_file_map(struct pt_section *section, FILE *file)
{
struct pt_sec_file_mapping *mapping;
uint64_t offset, size;
long begin, end, fsize;
int errcode;
if (!section)
return -pte_internal;
mapping = section->mapping;
if (mapping)
return -pte_internal;
offset = section->offset;
size = section->size;
begin = (long) offset;
end = begin + (long) size;
/* Check for overflows. */
if ((uint64_t) begin != offset)
return -pte_bad_image;
if ((uint64_t) end != (offset + size))
return -pte_bad_image;
if (end < begin)
return -pte_bad_image;
/* Validate that the section lies within the file. */
errcode = fseek(file, 0, SEEK_END);
if (errcode)
return -pte_bad_image;
fsize = ftell(file);
if (fsize < 0)
return -pte_bad_image;
if (fsize < end)
return -pte_bad_image;
mapping = malloc(sizeof(*mapping));
if (!mapping)
return -pte_nomem;
errcode = fmap_init(mapping);
if (errcode < 0) {
free(mapping);
return errcode;
}
mapping->file = file;
mapping->begin = begin;
mapping->end = end;
section->mapping = mapping;
section->unmap = pt_sec_file_unmap;
section->read = pt_sec_file_read;
return pt_section_add_bcache(section);
}
