Hello!
Alessandro Suardi wrote:
> > I just found something that looks somewhat weird:
> > mordor:~$ /bin/nonexistent_binary
> > bash: ./nonexistent_binary: Permission denied
> > mordor:~$ nonexistent_binary
> > bash: nonexistent_binary: command not found
> >
> > Shouldn't first attempt also say "command not found"?
> > BASH_VERSION='2.03.0(1)-release'
> > I'm running 2.3.99-pre3
> Not a kernel problem (TM).
Not likely. execve(2) returns permission denied.
But it should return ENOENT (from man execve(2):)
ENOENT The file filename or a script or ELF interpreter
does not exist.
See:
mordor:~$ strace -e trace=stat bash -c '/bin/nonexistent_binary'
stat("/home/green", {...}) = 0
...
stat("/bin/nonexistent_binary", 0xbffff77c) = -1 ENOENT (No such file or directory)
BUT!
mordor:~$ strace -e trace=execve bash -c '/bin/nonexistent_binary'
execve("/usr/bin/bash", ["bash", "-c", "/bin/nonexistent_binary"], [/* 29 vars */]) = 0
execve("/bin/nonexistent_binary", ["/bin/nonexistent_binary"], [/* 27 vars */])
= -1 EACCES (Permission denied)
bash: /bin/nonexistent_binary: Permission denied
Bye,
Oleg
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