mirror of
https://github.com/radareorg/radare2.git
synced 2024-11-27 23:20:40 +00:00
0dcac185dc
* Fix another UAF in skyline * Simplify * r_vector_insert() accepts assign at last index * No need to check for parts that fit/overlap with new_part if new_part itself fitted inside a prev_part
66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
/* radare2 - LGPL - Copyright 2020 - GustavoLCR */
|
|
|
|
#include <r_skyline.h>
|
|
|
|
#define CMP_BEGIN_GTE_PART(addr, part) \
|
|
(((addr) > (r_itv_begin (((RSkylineItem *)(part))->itv))) - ((addr) < (r_itv_begin (((RSkylineItem *)(part))->itv))))
|
|
|
|
#define CMP_END_GTE_PART(addr, part) \
|
|
(((addr) < (r_itv_end (((RSkylineItem *)(part))->itv)) || !r_itv_end (((RSkylineItem *)(part))->itv)) ? -1 : 1)
|
|
|
|
R_API bool r_skyline_add(RSkyline *skyline, RInterval itv, void *user) {
|
|
r_return_val_if_fail (skyline && r_itv_size (itv), false);
|
|
RVector *skyline_vec = &skyline->v;
|
|
RSkylineItem new_part = { itv, user };
|
|
const ut64 new_part_end = r_itv_end (new_part.itv);
|
|
|
|
// `slot` is the index of the first RSkylineItem with part->itv.addr >= new_part.itv.addr
|
|
size_t slot;
|
|
r_vector_lower_bound (skyline_vec, new_part.itv.addr, slot, CMP_BEGIN_GTE_PART);
|
|
const bool is_last = slot == r_vector_len (skyline_vec);
|
|
bool is_inside_prev_part = false;
|
|
if (slot) {
|
|
RSkylineItem *prev_part = r_vector_index_ptr (skyline_vec, slot - 1);
|
|
const ut64 prev_part_end = r_itv_end (prev_part->itv);
|
|
if (prev_part_end > r_itv_begin (new_part.itv)) {
|
|
prev_part->itv.size = r_itv_begin (new_part.itv) - r_itv_begin (prev_part->itv);
|
|
if (prev_part_end > new_part_end) {
|
|
RSkylineItem tail;
|
|
tail.user = prev_part->user;
|
|
tail.itv.addr = new_part_end;
|
|
tail.itv.size = prev_part_end - r_itv_begin (tail.itv);
|
|
r_vector_insert (skyline_vec, slot, &tail);
|
|
is_inside_prev_part = true;
|
|
}
|
|
}
|
|
}
|
|
if (!is_last && !is_inside_prev_part) {
|
|
RSkylineItem *part = r_vector_index_ptr (skyline_vec, slot);
|
|
while (part && r_itv_include (new_part.itv, part->itv)) {
|
|
// Remove `part` that fits in `new_part`
|
|
r_vector_remove_at (skyline_vec, slot, NULL);
|
|
part = slot < r_vector_len (skyline_vec) ? r_vector_index_ptr (skyline_vec, slot) : NULL;
|
|
}
|
|
if (part && r_itv_overlap (new_part.itv, part->itv)) {
|
|
// Chop start of last `part` that intersects `new_part`
|
|
const ut64 oaddr = r_itv_begin (part->itv);
|
|
part->itv.addr = new_part_end;
|
|
part->itv.size -= r_itv_begin (part->itv) - oaddr;
|
|
}
|
|
}
|
|
r_vector_insert (skyline_vec, slot, &new_part);
|
|
return true;
|
|
}
|
|
|
|
R_API const RSkylineItem *r_skyline_get_item_intersect(RSkyline *skyline, ut64 addr, ut64 len) {
|
|
r_return_val_if_fail (skyline, NULL);
|
|
RVector *skyline_vec = &skyline->v;
|
|
size_t i, l = r_vector_len (skyline_vec);
|
|
r_vector_lower_bound (skyline_vec, addr, i, CMP_END_GTE_PART);
|
|
if (i == l) {
|
|
return false;
|
|
}
|
|
const RSkylineItem *item = r_vector_index_ptr (skyline_vec, i);
|
|
return item->itv.addr <= addr + len ? item : NULL;
|
|
}
|