xtables: add xt_match, xt_target and data copy_to_user functions

xt_entry_target, xt_entry_match and their private data may contain
kernel data.

Introduce helper functions xt_match_to_user, xt_target_to_user and
xt_data_to_user that copy only the expected fields. These replace
existing logic that calls copy_to_user on entire structs, then
overwrites select fields.

Private data is defined in xt_match and xt_target. All matches and
targets that maintain kernel data store this at the tail of their
private structure. Extend xt_match and xt_target with .usersize to
limit how many bytes of data are copied. The remainder is cleared.

If compatsize is specified, usersize can only safely be used if all
fields up to usersize use platform-independent types. Otherwise, the
compat_to_user callback must be defined.

This patch does not yet enable the support logic.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

path: root/sound/parisc/Kconfig

# ALSA PA-RISC drivers

menuconfig SND_GSC
	bool "GSC sound devices"
	depends on GSC
	default y
	help
	  Support for GSC sound devices on PA-RISC architectures.

if SND_GSC

config SND_HARMONY
	tristate "Harmony/Vivace sound chip"
	select SND_PCM
	help
	  Say 'Y' or 'M' to include support for the Harmony/Vivace sound
	  chip found in most GSC-based PA-RISC workstations.  It's frequently
	  provided as part of the Lasi multi-function IC.

endif	# SND_GSC