kern/163076: It is not possible to read in chunks from linprocfs and procfs.

[Dag-Erling Smørgrav]

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
 case.
 
 DES
 --=20
 Dag-Erling Sm=C3=B8rgrav - des at des.no