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Hannes Frederic Sowa f3d3342602 net: rework recvmsg handler msg_name and msg_namelen logic ... This patch now always passes msg->msg_namelen as 0. recvmsg handlers must set msg_namelen to the proper size <= sizeof(struct sockaddr_storage) to return msg_name to the user. This prevents numerous uninitialized memory leaks we had in the recvmsg handlers and makes it harder for new code to accidentally leak uninitialized memory. Optimize for the case recvfrom is called with NULL as address. We don't need to copy the address at all, so set it to NULL before invoking the recvmsg handler. We can do so, because all the recvmsg handlers must cope with the case a plain read() is called on them. read() also sets msg_name to NULL. Also document these changes in include/linux/net.h as suggested by David Miller. Changes since RFC: Set msg->msg_name = NULL if user specified a NULL in msg_name but had a non-null msg_namelen in verify_iovec/verify_compat_iovec. This doesn't affect sendto as it would bail out earlier while trying to copy-in the address. It also more naturally reflects the logic by the callers of verify_iovec. With this change in place I could remove " if (!uaddr || msg_sys->msg_namelen == 0) msg->msg_name = NULL ". This change does not alter the user visible error logic as we ignore msg_namelen as long as msg_name is NULL. Also remove two unnecessary curly brackets in ___sys_recvmsg and change comments to netdev style. Cc: David Miller <davem@davemloft.net> Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>		11 years ago
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act2000	…
capi	isdn/kcapi: fix a small underflow	12 years ago
divert	ISDN:divert: beautify code: useless 'break', 'return (0)', additional comments.	12 years ago
gigaset	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	12 years ago
hardware	isdn: remove deprecated IRQF_DISABLED	11 years ago
hisax	isdn: clean up debug format string usage	12 years ago
hysdn	procfs: new helper - PDE_DATA(inode)	12 years ago
i4l	isdn: Correct comparison of skb->tail and skb-transport_header	12 years ago
icn	isdn: icn: NULL dereference printing error message	11 years ago
isdnloop	isdnloop: use strlcpy() instead of strcpy()	11 years ago
mISDN	net: rework recvmsg handler msg_name and msg_namelen logic	11 years ago
pcbit	isdn: Fix typo in drivers/isdn	12 years ago
sc	isdn: remove deprecated IRQF_DISABLED	11 years ago
Kconfig	tty: Added a CONFIG_TTY option to allow removal of TTY	12 years ago
Makefile	…