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Bug #45040 64 bit inode stat fails without LFS flags (ex: recursive mkdir)
Submitted: 2008-05-19 19:58 UTC Modified: 2009-04-30 19:46 UTC
Votes:5
Avg. Score:4.6 ± 0.8
Reproduced:4 of 4 (100.0%)
Same Version:3 (75.0%)
Same OS:3 (75.0%)
From: ntang at communityconnect dot com Assigned:
Status: Verified Package: Filesystem function related
PHP Version: 5.*, 6CVS (2009-04-30) OS: Linux
Private report: No CVE-ID:
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 [2008-05-19 19:58 UTC] ntang at communityconnect dot com
Description:
------------
Using a filesystem w/ 64 bit inodes fails on Linux.  Functions that require stat'ing files (such as a recursive mkdir) fail - even when stat64 returns a 0 it overflows and sees it as non-existant... the end result is that if directory /x/y/z exists on a filesystem w/ 64 bit inodes, and you do a recursive mkdir of /x/y/z/a/b/c, c b and a will all return "does not exist" properly, but then it will keep going past z and y and try to create x (at which point it returns an error saying that x already exists).

What we found from testing and then googling, is that after you include <stdio.h>, you need to add this define for 64 bit inodes to be recognized by the gnu libraries:

#define __USE_FILE_OFFSET64


Here's some c code to test, you can run it with and without the define to see what happens:

#include <stdio.h>
#define __USE_FILE_OFFSET64
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/statvfs.h>
int main(int argc, char** argv)
{
    struct stat buf;
    if (stat(argv[1], &buf) != 0)
    {
        printf("stat failed!\n");
        return 2;
    }
    printf("inode is %llu\n", buf.st_ino);
    return 0;
}


Long story short: the define above needs to be baked into PHP anytime it makes filesystem calls (or at least be added as a flag as a compile-time option for ./configure).

Reproduce code:
---------------
To test:

#!/usr/local/bin/php

<?php 

mkdir('/mnt/test/blarg/bagga/booga/zim/zam/zoo',0755,true);

?>

Expected result:
----------------
It should create /mnt/test/blarg/bagga/booga/zim/zam/zoo.

Actual result:
--------------
It doesn't create the directory.  Note that even when stat64 succeeds and returns 0, it still keeps going.

stat64("/mnt/test/blarg/bagga/booga/zim/zam", 0xbff6f2f0) = -1 ENOENT (No such file or directory)
write(2, "stat(\"/mnt/test/blarg/bagga/boog"..., 49stat("/mnt/test/blarg/bagga/booga/zim/zam") = -1
) = 49
stat64("/mnt/test/blarg/bagga/booga/zim", 0xbff6f2f0) = -1 ENOENT (No such file or directory)
write(2, "stat(\"/mnt/test/blarg/bagga/boog"..., 45stat("/mnt/test/blarg/bagga/booga/zim") = -1
) = 45
stat64("/mnt/test/blarg/bagga/booga", 0xbff6f2f0) = -1 ENOENT (No such file or directory)
write(2, "stat(\"/mnt/test/blarg/bagga/boog"..., 41stat("/mnt/test/blarg/bagga/booga") = -1
) = 41
stat64("/mnt/test/blarg/bagga", 0xbff6f2f0) = -1 ENOENT (No such file or directory)
write(2, "stat(\"/mnt/test/blarg/bagga\") = "..., 35stat("/mnt/test/blarg/bagga") = -1
) = 35
stat64("/mnt/test/blarg", 0xbff6f2f0)   = -1 ENOENT (No such file or directory)
write(2, "stat(\"/mnt/test/blarg\") = -1\n", 29stat("/mnt/test/blarg") = -1
) = 29
stat64("/mnt/test", {st_dev=makedev(0, 54), st_ino=4294967298, st_mode=S_IFDIR|0755, st_nlink=19, st_uid=99, st_gid=98, st_blksize=4096, st_blocks=8, st_size=4096, st_atime=2008/05/16-18:10:05, st_mtime=2008/05/16-17:20:29, st_ctime=2008/05/16-17:20:29}) = 0
write(2, "stat(\"/mnt/test\") = -1\n", 23stat("/mnt/test") = -1
) = 23
stat64("/mnt", {st_dev=makedev(8, 7), st_ino=98306, st_mode=S_IFDIR|0755, st_nlink=5, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=16, st_size=4096, st_atime=2008/05/16-18:10:03, st_mtime=2008/05/16-16:55:20, st_ctime=2008/05/16-16:55:20}) = 0
write(2, "stat(\"/mnt\") = 0\n", 17stat("/mnt") = 0
)    = 17
mkdir("/mnt/test", 0755)                = -1 EEXIST (File exists)
write(1, "\nWarning: mkdir(): File exists i"..., 57



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 [2009-04-30 19:44 UTC] jani@php.net
Confirmed that using LFS flags fixes this. See also bug #48099 in which 
this was tested and confirmed to work. 

However, LFS support requires a bit more fixes than just a compile 
flags..
 [2009-04-30 19:46 UTC] jani@php.net
See also bug #27792
 
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