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netlink: split up copies in the ack construction

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Clean up the use of unsafe_memcpy() by adding a flexible array
at the end of netlink message header and splitting up the header
and data copies.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2022-10-27 14:25:53 -07:00 • committed by David S. Miller
parent eca485d221
commit 738136a0e3
3 changed files with 43 additions and 9 deletions
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2
include/uapi/linux/netlink.h
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@ -48,6 +48,7 @@ struct sockaddr_nl {
* @nlmsg_flags: Additional flags
* @nlmsg_seq: Sequence number
* @nlmsg_pid: Sending process port ID
* @nlmsg_data: Message payload
*/
struct nlmsghdr {
__u32 nlmsg_len;
@ -55,6 +56,7 @@ struct nlmsghdr {
__u16 nlmsg_flags;
__u32 nlmsg_seq;
__u32 nlmsg_pid;
__u8 nlmsg_data[];
};
/* Flags values */