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From: "sdrake at xnet dot co.nz" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug libc/13280] New: execve(2) does not honor sysconf(_SC_ARG_MAX) in some cases.
Date: Tue, 11 Oct 2011 08:36:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13280

             Bug #: 13280
           Summary: execve(2) does not honor sysconf(_SC_ARG_MAX) in some
                    cases.
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: critical
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: sdrake@xnet.co.nz
    Classification: Unclassified
              Host: x86_64-unknown-linux-gnu


Steven Drake <sdrake at xnet dot co.nz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |testsuite+

Created attachment 5974
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5974
test-skeleton.c based test case (causes execve to fail with E2BIG).

If execve is given an argv with a string that is larger than 131072
(coincidentally the ARG_MAX macro from linux/limits.h) but less than what
sysconf(_SC_ARG_MAX) return, execve fails with E2BIG.

This does not happen if the total length of the argv strings is greater
than ARG_MAX but each is shorter.

This is a problem if using "/bin/sh -c", i.e. system(3).

I'm not sure if this is a glibc or linux issue but I am reporting it here
anyway.

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