Updated dynamic pty patch available

H. Peter Anvin
2004-02-12T06:01:00Z

ftp://ftp.kernel.org/pub/linux/kernel/people/hpa/dynpty-test-2.patch

... against the current top-of-bkcvs 2.6 kernel.

This version of the patch makes *both* legacy and Unix98 ptys configure
options (Unix98 only if EMBEDDED), and the number of legacy ptys is a
configuration option -- useful if you want to reduce the memory
footprint, or if you really wants lots of these guys (256 is no longer a
hard limit.)

Additionally, I have added a sysctl option -- /proc/sys/kernel/pty/max
-- for limiting the number of Unix98 ptys. It was way too effective a
DoS to eat up all kernel memory by opening /dev/ptmx repeatedly. The
default is 4096, but it can be adjusted all the way up to 2^20 if desirable.

-hpa