Fix #81726: phar wrapper: DOS when using quine gzip file

The phar wrapper needs to uncompress the file; the uncompressed file
might be compressed, so the wrapper implementation loops. This raises
potential DOS issues regarding too deep or even infinite recursion (the
latter are called compressed file quines[1]). We avoid that by
introducing a recursion limit; we choose the somewhat arbitrary limit
`3`.

This issue has been reported by real_as3617 and gPayl0ad.

[1] <https://honno.dev/gzip-quine/>

Author: cmb69

NEWS

@@ -3,6 +3,7 @@ PHP                                                                        NEWS
 29 Sep 2022, PHP 7.4.31
 
 - Core:
+  . Fixed bug #81726: phar wrapper: DOS when using quine gzip file. (cmb)
   . Fixed bug #81727: Don't mangle HTTP variable names that clash with ones
     that have a specific semantic meaning. (Derick)
 

ext/phar/phar.c

@@ -1584,7 +1584,8 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 	const char zip_magic[] = "PK\x03\x04";
 	const char gz_magic[] = "\x1f\x8b\x08";
 	const char bz_magic[] = "BZh";
-	char *pos, test = '\0';
+	char *pos;
+	int recursion_count = 3; // arbitrary limit to avoid too deep or even infinite recursion
 	const int window_size = 1024;
 	char buffer[1024 + sizeof(token)]; /* a 1024 byte window + the size of the halt_compiler token (moving window) */
 	const zend_long readsize = sizeof(buffer) - sizeof(token);
@@ -1612,8 +1613,7 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 			MAPPHAR_ALLOC_FAIL("internal corruption of phar \"%s\" (truncated entry)")
 		}
 
-		if (!test) {
-			test = '\1';
+		if (recursion_count) {
 			pos = buffer+tokenlen;
 			if (!memcmp(pos, gz_magic, 3)) {
 				char err = 0;
@@ -1673,7 +1673,10 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 				compression = PHAR_FILE_COMPRESSED_GZ;
 
 				/* now, start over */
-				test = '\0';
+				if (!--recursion_count) {
+					MAPPHAR_ALLOC_FAIL("unable to decompress gzipped phar archive \"%s\"");
+					break;
+				}
 				continue;
 			} else if (!memcmp(pos, bz_magic, 3)) {
 				php_stream_filter *filter;
@@ -1711,7 +1714,10 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 				compression = PHAR_FILE_COMPRESSED_BZ2;
 
 				/* now, start over */
-				test = '\0';
+				if (!--recursion_count) {
+					MAPPHAR_ALLOC_FAIL("unable to decompress bzipped phar archive \"%s\"");
+					break;
+				}
 				continue;
 			}
 

ext/phar/tests/bug81726.gz

@@ -0,0 +1,14 @@
+--TEST--
+Bug #81726 (phar wrapper: DOS when using quine gzip file)
+--SKIPIF--
+<?php
+if (!extension_loaded("phar")) die("skip phar extension not available");
+if (!extension_loaded("zlib")) die("skip zlib extension not available");
+?>
+--FILE--
+<?php
+var_dump(fopen("phar://" . __DIR__ . "/bug81726.gz", "r"));
+?>
+--EXPECTF--
+Warning: fopen(phar://%s): failed to open stream: unable to decompress gzipped phar archive "%s" in %s on line %d
+bool(false)