kern/163076: It is not possible to read in chunks from
linprocfs and procfs.
des at des.no
Sat Dec 10 01:20:09 UTC 2011
The following reply was made to PR kern/163076; it has been noted by GNATS.
From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des at des.no>
To: Jaakko Heinonen <jh at FreeBSD.org>
Cc: Poul-Henning Kamp <phk at phk.freebsd.dk>, Petr Salinger <Petr.Salinger at seznam.cz>, bug-followup at FreeBSD.org, mdf at FreeBSD.org
Subject: Re: kern/163076: It is not possible to read in chunks from linprocfs and procfs.
Date: Sat, 10 Dec 2011 02:13:56 +0100
Jaakko Heinonen <jh at FreeBSD.org> writes:
> Dag-Erling Sm=C3=B8rgrav wrote:
> > What if the sbuf is in a state where asking for its length is
> > meaningless?
> Could you give an example about such state? Isn't the length first
> initialized to zero and then increased only when byte(s) has been
> successfully appended to the buffer? sbuf_len() has worked for
> unfinished buffers since r71724.
A fixed-length sbuf may overflow intentionally (as in pseudofs) or
unintentionally; a dynamic sbuf may also overflow due to a memory
allocation failure. The first two cases are expected, but the third is
not, and I am not sure the sbuf should be considered valid in such a
Dag-Erling Sm=C3=B8rgrav - des at des.no
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