Bug#410671: iceweasel: firefox leaks filehandles to external applications

Jörg Sommer joerg at alea.gnuu.de
Sun Oct 2 11:20:34 UTC 2011


how about using O_CLOEXEC when opening files or sockets?

From the manual page open(2):

   O_CLOEXEC (Since Linux 2.6.23)
          Enable the close-on-exec  flag  for  the  new  file  descriptor.
          Specifying  this  flag  permits  a  program  to avoid additional
          fcntl(2) F_SETFD operations to set the FD_CLOEXEC  flag.   Addi-
          tionally,  use  of  this flag is essential in some multithreaded
          programs since using a separate fcntl(2)  F_SETFD  operation  to
          set  the  FD_CLOEXEC  flag does not suffice to avoid race condi-
          tions where one thread opens a file descriptor at the same  time
          as another thread does a fork(2) plus execve(2).

Bye, Jörg.
Damit das Mögliche entsteht, muß immer wieder das Unmögliche versucht
werden.                                       (Hermann Hesse)
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