Bug #78066 [NEW]: PHP eats the first byte of a program that comes from process substitution

From: octalbugsphp at alvarezp dot org Operating system: Linux PHP version: 7.3.5 Package: *General Issues Bug Type: Bug Bug description:PHP eats the first byte of a program that comes from process substitution Description: ------------ PHP eats the first byte of a program that comes from process substitution After discussion in ##php at Freenode this was found (see the third line, lseek) $ strace php -f <(echo -- '<?php print("hello\n"); ?>') 2>&1 | grep -A 5 'openat.*/dev/fd/63' openat(AT_FDCWD, "/dev/fd/63", O_RDONLY) = 3 fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0 read(3, "-- <?php print(\"hello\\n\"); ?>\n", 4096) = 30 lseek(3, 0, SEEK_SET) = -1 ESPIPE (Illegal seek) lstat("/dev/fd/63", {st_mode=S_IFLNK|0500, st_size=64, ...}) = 0 readlink("/dev/fd/63", "pipe:[6195898]", 4096) = 14 Test script: --------------- [ 0][Sat May 25 11:05:07 -0500 -- alvarezp@alvarezp-samsung:~] $ php -f <(echo '<?php print("hello\n"); ?>') ?php print("hello\n"); ?> [ 0][Sat May 25 11:05:11 -0500 -- alvarezp@alvarezp-samsung:~] $ php -f <(echo ' <?php print("hello\n"); ?>') hello [ 0][Sat May 25 11:05:19 -0500 -- alvarezp@alvarezp-samsung:~] $ php -f <(echo -- '<?php print("hello\n"); ?>') - hello Expected result: ---------------- The script should run as expected. The first byte should prevail as part of the script. Actual result: -------------- The first byte is eaten and not interpreted at all. -- Edit bug report at https://bugs.php.net/bug.php?id=78066&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=78066&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=78066&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=78066&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=78066&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78066&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78066&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78066&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78066&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78066&r=support Expected behavior: https://bugs.php.net/fix.php?id=78066&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78066&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78066&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78066&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=78066&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=78066&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78066&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78066&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78066&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78066&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78066&r=mysqlcfg