1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
// SPDX-License-Identifier: GPL-2.0
/*
* Regression3
* Description:
* Helper radix_tree_iter_retry resets next_index to the current index.
* In following radix_tree_next_slot current chunk size becomes zero.
* This isn't checked and it tries to dereference null pointer in slot.
*
* Helper radix_tree_iter_resume reset slot to NULL and next_index to index + 1,
* for tagger iteraction it also must reset cached tags in iterator to abort
* next radix_tree_next_slot and go to slow-path into radix_tree_next_chunk.
*
* Running:
* This test should run to completion immediately. The above bug would
* cause it to segfault.
*
* Upstream commit:
* Not yet
*/
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <linux/radix-tree.h>
#include <stdlib.h>
#include <stdio.h>
#include "regression.h"
void regression3_test(void)
{
RADIX_TREE(root, GFP_KERNEL);
void *ptr0 = (void *)4ul;
void *ptr = (void *)8ul;
struct radix_tree_iter iter;
void **slot;
bool first;
printv(1, "running regression test 3 (should take milliseconds)\n");
radix_tree_insert(&root, 0, ptr0);
radix_tree_tag_set(&root, 0, 0);
first = true;
radix_tree_for_each_tagged(slot, &root, &iter, 0, 0) {
printv(2, "tagged %ld %p\n", iter.index, *slot);
if (first) {
radix_tree_insert(&root, 1, ptr);
radix_tree_tag_set(&root, 1, 0);
first = false;
}
if (radix_tree_deref_retry(*slot)) {
printv(2, "retry at %ld\n", iter.index);
slot = radix_tree_iter_retry(&iter);
continue;
}
}
radix_tree_delete(&root, 1);
first = true;
radix_tree_for_each_slot(slot, &root, &iter, 0) {
printv(2, "slot %ld %p\n", iter.index, *slot);
if (first) {
radix_tree_insert(&root, 1, ptr);
first = false;
}
if (radix_tree_deref_retry(*slot)) {
printv(2, "retry at %ld\n", iter.index);
slot = radix_tree_iter_retry(&iter);
continue;
}
}
radix_tree_for_each_slot(slot, &root, &iter, 0) {
printv(2, "slot %ld %p\n", iter.index, *slot);
if (!iter.index) {
printv(2, "next at %ld\n", iter.index);
slot = radix_tree_iter_resume(slot, &iter);
}
}
radix_tree_tag_set(&root, 0, 0);
radix_tree_tag_set(&root, 1, 0);
radix_tree_for_each_tagged(slot, &root, &iter, 0, 0) {
printv(2, "tagged %ld %p\n", iter.index, *slot);
if (!iter.index) {
printv(2, "next at %ld\n", iter.index);
slot = radix_tree_iter_resume(slot, &iter);
}
}
radix_tree_delete(&root, 0);
radix_tree_delete(&root, 1);
printv(1, "regression test 3 passed\n");
}
|
