New subject: [Bug 586643] posix_fallocate lets one bypass RLIMIT_FSIZE

9 Mar 2010

      http://bugzilla.novell.com/show_bug.cgi?id=586643

http://bugzilla.novell.com/show_bug.cgi?id=586643#c0

           Summary: posix_fallocate lets one bypass RLIMIT_FSIZE
    Classification: openSUSE
           Product: openSUSE 11.2
           Version: Final
          Platform: x86-64
        OS/Version: openSUSE 11.2
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Kernel
        AssignedTo: kernel-maintainers@forge.provo.novell.com
        ReportedBy: opensuse.org@contacts.eelis.net
         QAContact: qa@suse.de
          Found By: ---
           Blocker: ---

Created an attachment (id=347364)
 --> (http://bugzilla.novell.com/attachment.cgi?id=347364)
Testcase program showing the problem

User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.4)
Gecko/20091016 SUSE/3.5.4-1.1.2 Firefox/3.5.4

The attached testcase shows that by calling posix_fallocate one can bypass an
RLIMIT_FSIZE limit and create a file larger than the limit.

The problem appears to be ext4 specific.

Reproducible: Always

Steps to Reproduce:
1. compile attached testcase, note the 1000 byte file size limit;
2. run testcase;
3. observe that a 1000000 byte file "tmp" has been created.

Actual Results:  
The actual result is that the program creates a 1000000 byte file.

Expected Results:  
The expected result is that the program fails to create a 1000000 byte file, in
accordance with the RLIMIT_FSIZE limit.

Only seems to happen with ext4.

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[Bug 586643] New: posix_fallocate lets one bypass RLIMIT_FSIZE

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