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
|
Backported for 7.0 by remi
without binary diff
From e0f5d62bd6690169998474b62f92a8c5ddf0e699 Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Sun, 3 Mar 2019 22:33:38 -0800
Subject: [PATCH] Fix bug #77586 - phar_tar_writeheaders_int() buffer overflow
---
NEWS | 11 +++++-----
ext/phar/tar.c | 7 ++++++-
ext/phar/tests/bug71488.phpt | 5 +++--
ext/phar/tests/bug77586.phpt | 21 +++++++++++++++++++
...-dne29hvpNWXiVbepwIf8-NRHWM9LITLo3nXZnKVNC | 1 +
5 files changed, 37 insertions(+), 8 deletions(-)
create mode 100644 ext/phar/tests/bug77586.phpt
create mode 100644 ext/phar/tests/bug77586/files/link-nktarAMLdJBv7BGYnpzg-ZDycSpWN3Ne3kacltOSE-EqfhStJ1EoBpGuoua6VE-dne29hvpNWXiVbepwIf8-NRHWM9LITLo3nXZnKVNC
diff --git a/ext/phar/tar.c b/ext/phar/tar.c
index 9de3047f7c90..20f688272752 100644
--- a/ext/phar/tar.c
+++ b/ext/phar/tar.c
@@ -762,7 +762,12 @@ static int phar_tar_writeheaders_int(phar_entry_info *entry, void *argument) /*
header.typeflag = entry->tar_type;
if (entry->link) {
- strncpy(header.linkname, entry->link, strlen(entry->link));
+ if (strlcpy(header.linkname, entry->link, sizeof(header.linkname)) >= sizeof(header.linkname)) {
+ if (fp->error) {
+ spprintf(fp->error, 4096, "tar-based phar \"%s\" cannot be created, link \"%s\" is too long for format", entry->phar->fname, entry->link);
+ }
+ return ZEND_HASH_APPLY_STOP;
+ }
}
strncpy(header.magic, "ustar", sizeof("ustar")-1);
diff --git a/ext/phar/tests/bug77586.phpt b/ext/phar/tests/bug77586.phpt
new file mode 100644
index 000000000000..039cc16994eb
--- /dev/null
+++ b/ext/phar/tests/bug77586.phpt
@@ -0,0 +1,21 @@
+--TEST--
+Bug #77586 Symbolic link names in tar-formatted phar must be less than 100 bytes.
+--SKIPIF--
+<?php if (!extension_loaded("phar") || true /* blocked by bug 65332 */) die("skip"); ?>
+--FILE--
+<?php
+$dir = __DIR__."/bug77586";
+$phar = new PharData($dir . "/bug77586.tar");
+$phar->buildFromDirectory($dir . "/files");
+?>
+--CLEAN--
+<?php
+$dir = __DIR__."/bug77586";
+unlink($dir . "/bug77586.tar");
+?>
+--EXPECTF--
+Fatal error: Uncaught PharException: tar-based phar "%s/bug77586.tar" cannot be created, link "%s" is too long for format %s
+Stack trace:
+#0 %s/bug77586.php(%d): PharData->buildFromDirectory('%s')
+#1 {main}
+ thrown in %s/bug77586.php %s on line %d
diff --git a/ext/phar/tests/bug77586/files/link-nktarAMLdJBv7BGYnpzg-ZDycSpWN3Ne3kacltOSE-EqfhStJ1EoBpGuoua6VE-dne29hvpNWXiVbepwIf8-NRHWM9LITLo3nXZnKVNC b/ext/phar/tests/bug77586/files/link-nktarAMLdJBv7BGYnpzg-ZDycSpWN3Ne3kacltOSE-EqfhStJ1EoBpGuoua6VE-dne29hvpNWXiVbepwIf8-NRHWM9LITLo3nXZnKVNC
new file mode 100644
index 000000000000..1de565933b05
--- /dev/null
+++ b/ext/phar/tests/bug77586/files/link-nktarAMLdJBv7BGYnpzg-ZDycSpWN3Ne3kacltOSE-EqfhStJ1EoBpGuoua6VE-dne29hvpNWXiVbepwIf8-NRHWM9LITLo3nXZnKVNC
@@ -0,0 +1 @@
+target
\ No newline at end of file
|