Stateless and I stumbled upon this issue while discussing the
semantics of read, accepting a size_t but only being able to return
ssize_t, effectively lacking the ability to report successful
reads > SSIZE_MAX.
The discussion went along and we came to the topic of input-based
memory allocations. Basically, it was possible for the argument
to a memory-allocation-function to overflow, leading to a segfault
later.
The OpenBSD-guys came up with the ingenious reallocarray-function,
and I implemented it as ereallocarray, which automatically returns
on error.
Read more about it here[0].
A simple testcase is this (courtesy to stateless):
$ sbase-strings -n (2^(32|64) / 4)
This will segfault before this patch and properly return an OOM-
situation afterwards (thanks to the overflow-check in reallocarray).
[0]: http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man3/calloc.3
Well, isspacerune() has been fixed and some other FIXME's were also easy
to do.
There are some places where maybe some util-functions could be helpful.
In some cases, like for instance in regard to escape-sequences, I'm all
for consistency rather than adhering to the POSIX-standard too much.
Relying on centralized util-functions also makes it possible to keep
this consistency across the board.
FRIGN
sin
Hiltjo Posthuma
Evan Gates