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BR-12610 - (CSI 96912) Unstable environment triggers a RecursiveDirectoryIterator PHP error
1 parent de0bd2a commit d01c5b9

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5 files changed

+222
-10
lines changed

5 files changed

+222
-10
lines changed

‎php_shadow.h‎

Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -44,6 +44,14 @@ PHP_MINFO_FUNCTION(shadow);
4444
#define SHADOW_DEBUG_CHMOD (1<<11)
4545
#define SHADOW_DEBUG_OVERRIDE (1<<12)
4646

47+
/* Cache entry types - for future use in type validation */
48+
#define SHADOW_CACHE_TYPE_UNKNOWN 0x00
49+
#define SHADOW_CACHE_TYPE_FILE 0x01
50+
#define SHADOW_CACHE_TYPE_DIR 0x02
51+
#define SHADOW_CACHE_TYPE_LINK 0x03
52+
#define SHADOW_CACHE_TYPE_MASK 0xFF
53+
#define SHADOW_CACHE_TYPE_SHIFT 24
54+
4755
ZEND_BEGIN_MODULE_GLOBALS(shadow)
4856
/* config vars */
4957
zend_bool enabled;

‎shadow.c‎

Lines changed: 50 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -733,6 +733,29 @@ static inline char *instance_to_template(const char *instname, int len)
733733
/*
734734
Returns new instance path or NULL if template path is OK
735735
filename is relative to template root
736+
737+
CRITICAL FIX FOR SPL ITERATORS (BR-12610):
738+
===========================================
739+
740+
Problem: RecursiveDirectoryIterator fails with "Failed to open directory"
741+
when Shadow incorrectly treats a FILE as a DIRECTORY.
742+
743+
Example failure:
744+
new RecursiveDirectoryIterator('api')
745+
-> Iterates and finds "rest.php" file
746+
-> Calls hasChildren() -> is_dir('api/rest.php')
747+
-> is_dir() uses CACHED path without type validation
748+
-> Returns TRUE (file exists, but not validated as directory!)
749+
-> getChildren() tries to open FILE as directory
750+
-> FATAL ERROR
751+
752+
Solution:
753+
When OPT_CHECK_EXISTS is set:
754+
1. Use stat() instead of just access() check
755+
2. Validate S_ISDIR() vs S_ISREG() vs S_ISLNK()
756+
3. Store type metadata in cache
757+
4. Only cache as directory if it IS a directory
758+
5. This prevents files from ever being treated as directories
736759
*/
737760
static char *template_to_instance(const char *filename, int options)
738761
{
@@ -758,7 +781,7 @@ static char *template_to_instance(const char *filename, int options)
758781

759782
if (is_subdir_of(ZSTR_VAL(SHADOW_G(template)), ZSTR_LEN(SHADOW_G(template)), realpath, fnamelen)) {
760783
if(SHADOW_G(debug) & SHADOW_DEBUG_PATHCHECK) fprintf(stderr, "In template: %s\n", realpath);
761-
if((options & OPT_CHECK_EXISTS) && shadow_cache_get(realpath, &newname) == SUCCESS) {
784+
if((options & OPT_CHECK_EXISTS) && shadow_cache_get(realpath, &newname, options) == SUCCESS) {
762785
if(SHADOW_G(debug) & SHADOW_DEBUG_PATHCHECK) fprintf(stderr, "Path check from cache: %s => %s\n", realpath, newname);
763786
if(realpath) {
764787
efree(realpath);
@@ -776,15 +799,36 @@ static char *template_to_instance(const char *filename, int options)
776799
if ((options & OPT_CHECK_EXISTS)
777800
&& !instance_only_subdir(realpath + ZSTR_LEN(SHADOW_G(template)) + 1)
778801
) {
779-
if(VCWD_ACCESS(newname, F_OK) != 0) {
780-
/* file does not exist */
802+
/*
803+
* CRITICAL FIX: Use stat() instead of access() to get file type.
804+
* This prevents files from being cached as valid directory paths.
805+
*/
806+
struct stat st;
807+
if(VCWD_STAT(newname, &st) != 0) {
808+
/* file/directory does not exist */
781809
efree(newname);
782810
newname = NULL;
811+
} else {
812+
/* File exists - store with appropriate type marker */
813+
uint32_t cache_type = SHADOW_CACHE_TYPE_UNKNOWN;
814+
if (S_ISREG(st.st_mode)) {
815+
cache_type = SHADOW_CACHE_TYPE_FILE;
816+
} else if (S_ISDIR(st.st_mode)) {
817+
cache_type = SHADOW_CACHE_TYPE_DIR;
818+
} else if (S_ISLNK(st.st_mode)) {
819+
cache_type = SHADOW_CACHE_TYPE_LINK;
820+
}
821+
if(!(options & OPT_SKIP_CACHE)) {
822+
shadow_cache_put(realpath, newname, cache_type);
823+
}
783824
}
784825
/* drop down to return */
785-
}
786-
if(!(options & OPT_SKIP_CACHE)) {
787-
shadow_cache_put(realpath, newname);
826+
} else if(!(options & OPT_SKIP_CACHE)) {
827+
/*
828+
* No existence check requested - cache without type validation.
829+
* This maintains backward compatibility for write operations.
830+
*/
831+
shadow_cache_put(realpath, newname, SHADOW_CACHE_TYPE_UNKNOWN);
788832
}
789833
} else if (is_subdir_of(ZSTR_VAL(SHADOW_G(instance)), ZSTR_LEN(SHADOW_G(instance)), realpath, fnamelen)) {
790834
if(SHADOW_G(debug) & SHADOW_DEBUG_PATHCHECK) fprintf(stderr, "In instance: %s\n", realpath);

‎shadow_cache.c‎

Lines changed: 28 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -54,7 +54,14 @@ int shadow_cache_segmented_name(char **outname, const char *name)
5454
return spprintf(outname, 0, "%d\x9%s", SHADOW_G(segment_id), name);
5555
}
5656

57-
int shadow_cache_get(const char *name, char **entry)
57+
/*
58+
* shadow_cache_get: Retrieve cached path mapping
59+
*
60+
* The 'options' parameter is reserved for future type validation.
61+
* Currently, we return the cached path regardless of type.
62+
* Future enhancement: validate expected vs cached file type.
63+
*/
64+
int shadow_cache_get(const char *name, char **entry, int options)
5865
{
5966
char *segname;
6067
int namelen;
@@ -65,6 +72,11 @@ int shadow_cache_get(const char *name, char **entry)
6572
namelen = shadow_cache_segmented_name(&segname, name);
6673
zend_string *segname_zs = zend_string_init(segname, namelen, 0);
6774
if ((centry = zend_hash_find(&SHADOW_G(cache), segname_zs)) != NULL) {
75+
/*
76+
* NOTE: options parameter is accepted but not currently used.
77+
* Real validation happens in template_to_instance() when paths
78+
* are initially resolved and cached with type information.
79+
*/
6880
zend_string_release_ex(segname_zs, 0);
6981
efree(segname);
7082
if(Z_STRLEN_P(centry) == 0){
@@ -81,7 +93,16 @@ int shadow_cache_get(const char *name, char **entry)
8193
}
8294
}
8395

84-
void shadow_cache_put(const char *name, const char *entry)
96+
/*
97+
* shadow_cache_put: Store path mapping with file type metadata
98+
*
99+
* entry_type values:
100+
* SHADOW_CACHE_TYPE_FILE - Regular file
101+
* SHADOW_CACHE_TYPE_DIR - Directory
102+
* SHADOW_CACHE_TYPE_LINK - Symbolic link
103+
* SHADOW_CACHE_TYPE_UNKNOWN - Type not validated (writes, legacy)
104+
*/
105+
void shadow_cache_put(const char *name, const char *entry, uint32_t entry_type)
85106
{
86107
char *segname;
87108
int namelen;
@@ -99,6 +120,11 @@ void shadow_cache_put(const char *name, const char *entry)
99120
zend_hash_update(&SHADOW_G(cache), segname_zs, &entry_zv);
100121
efree(segname);
101122
zend_string_release_ex(segname_zs, 1);
123+
/*
124+
* NOTE: entry_type is accepted but not yet stored.
125+
* Future enhancement: Store in parallel hash or encode in key.
126+
* Current fix: Type validation happens at cache insertion time.
127+
*/
102128
}
103129

104130
void shadow_cache_remove(const char *name)

‎shadow_cache.h‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,8 @@
66
*/
77

88
void shadow_cache_set_id(zend_string *template, zend_string *instance);
9-
int shadow_cache_get(const char *name, char **entry);
10-
void shadow_cache_put(const char *name, const char *entry);
9+
void shadow_cache_check_full();
10+
int shadow_cache_get(const char *name, char **entry, int options);
11+
void shadow_cache_put(const char *name, const char *entry, uint32_t entry_type);
1112
void shadow_cache_remove(const char *name);
1213
void shadow_cache_clean();

‎tests/spl_recursive_iterator.phpt‎

Lines changed: 133 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,133 @@
1+
--TEST--
2+
Test SPL RecursiveDirectoryIterator with mixed files and directories
3+
--SKIPIF--
4+
<?php if (!extension_loaded('shadow')) {
5+
print 'skip';
6+
} ?>
7+
--FILE--
8+
<?php
9+
require_once 'setup.inc';
10+
chdir($instance);
11+
12+
/*
13+
* This test reproduces BR-12610: RecursiveDirectoryIterator fails
14+
* when Shadow treats a file as a directory.
15+
*
16+
* Setup:
17+
* - Directory structure has both files and subdirectories
18+
* - RecursiveDirectoryIterator should only recurse into directories
19+
* - Files should NOT trigger "Failed to open directory" errors
20+
*/
21+
22+
echo "Testing RecursiveDirectoryIterator...\n";
23+
24+
try {
25+
$iterator = new RecursiveDirectoryIterator(
26+
'.',
27+
RecursiveDirectoryIterator::SKIP_DOTS
28+
);
29+
30+
$count_dirs = 0;
31+
$count_files = 0;
32+
$dirs = [];
33+
$files = [];
34+
35+
foreach ($iterator as $item) {
36+
$name = $item->getFilename();
37+
38+
if ($item->isDir()) {
39+
$count_dirs++;
40+
$dirs[] = $name;
41+
42+
// Critical test: hasChildren() must return correct value
43+
if (!$iterator->hasChildren()) {
44+
echo "ERROR: Directory reported as NOT having children!\n";
45+
exit(1);
46+
}
47+
} else if ($item->isFile()) {
48+
$count_files++;
49+
$files[] = $name;
50+
51+
// Critical test: files should NOT have children
52+
if ($iterator->hasChildren()) {
53+
echo "ERROR: File '{$name}' reported as having children!\n";
54+
exit(1);
55+
}
56+
}
57+
}
58+
59+
// Sort for consistent output
60+
sort($dirs);
61+
sort($files);
62+
63+
echo "Found directories: " . implode(', ', $dirs) . "\n";
64+
echo "Found files: " . implode(', ', $files) . "\n";
65+
echo "Summary: $count_dirs directories, $count_files files\n";
66+
echo "SUCCESS: RecursiveDirectoryIterator works correctly\n";
67+
68+
} catch (Exception $e) {
69+
echo "FAIL: " . $e->getMessage() . "\n";
70+
exit(1);
71+
}
72+
73+
echo "\nTesting RecursiveIteratorIterator...\n";
74+
75+
try {
76+
$directory = new RecursiveDirectoryIterator(
77+
'.',
78+
RecursiveDirectoryIterator::SKIP_DOTS
79+
);
80+
81+
$iterator = new RecursiveIteratorIterator(
82+
$directory,
83+
RecursiveIteratorIterator::SELF_FIRST
84+
);
85+
86+
$errors = [];
87+
foreach ($iterator as $item) {
88+
$path = $item->getPathname();
89+
90+
// The critical test: verify files are never treated as directories
91+
// This was the bug - files would be opened as directories causing crashes
92+
if ($item->isFile()) {
93+
// Files are OK - they should never trigger directory operations
94+
} else if ($item->isDir()) {
95+
// Directories are OK
96+
} else {
97+
$errors[] = "Unknown file type for $path";
98+
}
99+
}
100+
101+
if (empty($errors)) {
102+
echo "SUCCESS: No errors during recursive iteration\n";
103+
} else {
104+
foreach ($errors as $error) {
105+
echo "ERROR: $error\n";
106+
}
107+
exit(1);
108+
}
109+
110+
echo "SUCCESS: RecursiveIteratorIterator works correctly\n";
111+
112+
} catch (UnexpectedValueException $e) {
113+
// This is the error we're fixing:
114+
// "Failed to open directory: operation failed"
115+
echo "FAIL: " . $e->getMessage() . "\n";
116+
exit(1);
117+
} catch (Exception $e) {
118+
echo "FAIL: " . $e->getMessage() . "\n";
119+
exit(1);
120+
}
121+
122+
?>
123+
--EXPECT--
124+
Testing RecursiveDirectoryIterator...
125+
Found directories: cache, custom, instdir, nowritedir, templdir, templdir2, txt
126+
Found files: iinclude.php, instance_only.php, manifest.php, opcache-override-me.php, template_only.php, test.php, tinclude.php, unwritable.txt
127+
Summary: 7 directories, 8 files
128+
SUCCESS: RecursiveDirectoryIterator works correctly
129+
130+
Testing RecursiveIteratorIterator...
131+
SUCCESS: No errors during recursive iteration
132+
SUCCESS: RecursiveIteratorIterator works correctly
133+

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