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From: arisawa <arisawa@ar.aichi-u.ac.jp>
In-Reply-To: <E9D002A0-CF5A-4059-96F9-9365F67D119B@ar.aichi-u.ac.jp>
Date: Sun, 25 Jan 2015 18:04:06 +0900
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Message-Id: <4D3BDBE7-5023-4870-89E7-0A84C619941A@ar.aichi-u.ac.jp>
References: <E9D002A0-CF5A-4059-96F9-9365F67D119B@ar.aichi-u.ac.jp>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] protection against resource exhaustion
Topicbox-Message-UUID: 3b613862-ead9-11e9-9d60-3106f5b1d025

thank you, mischief.

considering after I have posted previous mail,=20
I have come to think that the script below should fail with error and =
stop execution.

maia% cat foo
#!/bin/rc
./foo
maia%=20

current rc does not stop execution.
probably not due to protection problem by kernel.
there must be a bug in rc.

Kenji Arisawa

> 2015/01/25 15:16=E3=80=81arisawa <arisawa@ar.aichi-u.ac.JP> =
=E3=81=AE=E3=83=A1=E3=83=BC=E3=83=AB=EF=BC=9A
>=20
>=20
> Hello 9fans
>=20
> my mac has a protection below:
> -bash$ cat foo
> #!/bin/sh
> ./foo
> -bash$ ./foo
> ./foo: fork: Resource temporarily unavailable
> -bash$=20
>=20
> on the other hand, Plan 9 does not.
> kernel is protected against such programs, however they are not =
killed.
> therefore no new process can be created.
>=20
> does anyone have idea to fix the problem?
>=20
> Kenji Arisawa
>=20
>=20