[Bug libc/15514] New: pathconf(_PC_NAME_MAX) fails against large filesystems for 32bit processes

[Bug libc/15514] New: pathconf(_PC_NAME_MAX) fails against large filesystems for 32bit processes

[guenther at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15514

             Bug #: 15514
           Summary: pathconf(_PC_NAME_MAX) fails against large filesystems
                    for 32bit processes
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: critical
          Priority: P2
         Component: libc
        AssignedTo: unassigned@sourceware.org
        ReportedBy: guenther@gmail.com
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


pathconf(_PC_NAME_MAX) is implemented on top of statfs().  The 32bit version
therefore fails with the error EOVERFLOW if the filesystem that the path is on
is so large that its block count cannot be returned by the non-LFS version of
statfs().

Calls to statfs() that are completely internal to libc, such as this one,
should use the LFS version, statfs64().

According to a quick scan of the glibc source, other calls that might be
affected include posix_openpt() and (maybe) shm_open().

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[Bug libc/15514] pathconf(_PC_NAME_MAX) fails against large filesystems for 32bit processes

[schwab@linux-m68k.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=15514

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2013-05-22 07:29:17 UTC ---
Similar to bug 15333.

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[Bug libc/15514] pathconf(_PC_NAME_MAX) fails against large filesystems for 32bit processes

[peter@peter-b.co.uk]

https://sourceware.org/bugzilla/show_bug.cgi?id=15514

Peter TB Brett <peter@peter-b.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |peter@peter-b.co.uk

--- Comment #2 from Peter TB Brett <peter@peter-b.co.uk> ---
Created attachment 7538
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7538&action=edit
Proposed patch

Something like the attached?

Most of the pathconf queries use statvfs64(), so it didn't seem unreasonable to
make _PC_NAME_MAX do the same.

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[Bug libc/15514] pathconf(_PC_NAME_MAX) fails against large filesystems for 32bit processes

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15514

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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