diff options
Diffstat (limited to 'ext/phar/phar.c')
| -rw-r--r-- | ext/phar/phar.c | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/ext/phar/phar.c b/ext/phar/phar.c index 780be43257..47ff8cd790 100644 --- a/ext/phar/phar.c +++ b/ext/phar/phar.c @@ -639,6 +639,18 @@ int phar_parse_metadata(char **buffer, zval **metadata, php_uint32 zip_metadata_ /* }}}*/ /** + * Size of fixed fields in the manifest. + * See: http://php.net/manual/en/phar.fileformat.phar.php + */ +#define MANIFEST_FIXED_LEN 18 + +#define SAFE_PHAR_GET_32(buffer, endbuffer, var) \ + if (UNEXPECTED(buffer + 4 > endbuffer)) { \ + MAPPHAR_FAIL("internal corruption of phar \"%s\" (truncated manifest header)"); \ + } \ + PHAR_GET_32(buffer, var); + +/** * Does not check for a previously opened phar in the cache. * * Parse a new one and add it to the cache, returning either SUCCESS or @@ -721,12 +733,12 @@ static int phar_parse_pharfile(php_stream *fp, char *fname, int fname_len, char savebuf = buffer; endbuffer = buffer + manifest_len; - if (manifest_len < 10 || manifest_len != php_stream_read(fp, buffer, manifest_len)) { + if (manifest_len < MANIFEST_FIXED_LEN || manifest_len != php_stream_read(fp, buffer, manifest_len)) { MAPPHAR_FAIL("internal corruption of phar \"%s\" (truncated manifest header)") } /* extract the number of entries */ - PHAR_GET_32(buffer, manifest_count); + SAFE_PHAR_GET_32(buffer, endbuffer, manifest_count); if (manifest_count == 0) { MAPPHAR_FAIL("in phar \"%s\", manifest claims to have zero entries. Phars must have at least 1 entry"); @@ -746,7 +758,7 @@ static int phar_parse_pharfile(php_stream *fp, char *fname, int fname_len, char return FAILURE; } - PHAR_GET_32(buffer, manifest_flags); + SAFE_PHAR_GET_32(buffer, endbuffer, manifest_flags); manifest_flags &= ~PHAR_HDR_COMPRESSION_MASK; manifest_flags &= ~PHAR_FILE_COMPRESSION_MASK; @@ -966,13 +978,13 @@ static int phar_parse_pharfile(php_stream *fp, char *fname, int fname_len, char } /* extract alias */ - PHAR_GET_32(buffer, tmp_len); + SAFE_PHAR_GET_32(buffer, endbuffer, tmp_len); if (buffer + tmp_len > endbuffer) { MAPPHAR_FAIL("internal corruption of phar \"%s\" (buffer overrun)"); } - if (manifest_len < 10 + tmp_len) { + if (manifest_len < MANIFEST_FIXED_LEN + tmp_len) { MAPPHAR_FAIL("internal corruption of phar \"%s\" (truncated manifest header)") } @@ -1010,7 +1022,7 @@ static int phar_parse_pharfile(php_stream *fp, char *fname, int fname_len, char } /* we have 5 32-bit items plus 1 byte at least */ - if (manifest_count > ((manifest_len - 10 - tmp_len) / (5 * 4 + 1))) { + if (manifest_count > ((manifest_len - MANIFEST_FIXED_LEN - tmp_len) / (5 * 4 + 1))) { /* prevent serious memory issues */ MAPPHAR_FAIL("internal corruption of phar \"%s\" (too many manifest entries for size of manifest)") } @@ -1019,12 +1031,12 @@ static int phar_parse_pharfile(php_stream *fp, char *fname, int fname_len, char mydata->is_persistent = PHAR_G(persist); /* check whether we have meta data, zero check works regardless of byte order */ - PHAR_GET_32(buffer, len); + SAFE_PHAR_GET_32(buffer, endbuffer, len); if (mydata->is_persistent) { mydata->metadata_len = len; - if(!len) { + if (!len) { /* FIXME: not sure why this is needed but removing it breaks tests */ - PHAR_GET_32(buffer, len); + SAFE_PHAR_GET_32(buffer, endbuffer, len); } } if(len > endbuffer - buffer) { |