On Fri, 7 Nov 2003 10:05:10 +0100, Maarten de Boer wrote
> > Sorry if this is a silly question, but have you put a shell in your jail?
> > http://tiefighter.et.tudelft.nl/~arthur/cvsd/faq.html#cvsscripts
>
> No, I haven't, but why would I? What I execute from loginfo is a standalone
> application, it should not need a shell at all.
>
Sorry... I thought the link made it clear enough. When you run cvs with the -t
flag, you see a line like the following when loginfo is processed:
-> run_popen( yourLogProgram )
If you look at the cvs sources, you can see on line 396 of run.c that, as its
name would imply, run_popen() uses the popen() call to invoke your "standalone
application":
return (popen (cmd, mode));
Even though yourLogProgram is "standalone", a quick trip to popen(3) reveals:
DESCRIPTION
The popen() function ``opens'' a process by creating a pipe, forking, and
invoking the shell. Since a pipe is by definition unidirectional, the
type argument may specify only reading or writing, not both; the result-
ing stream is correspondingly read-only or write-only.
Notice that the "invoking the shell" part is not optional. Therefore, to use
popen() in a chroot jail (which is required for loginfo) you require a shell.
HTH,
Geoff
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