net: Convert struct sockaddr to fixed-size "sa_data[14]"
Revert struct sockaddr from flexible array to fixed 14-byte "sa_data",
which should solve a huge portion of -Wflex-array-member-not-at-end
warnings, since struct sockaddr is embedded within many network structs.
With socket/proto sockaddr-based internal APIs switched to use struct
sockaddr_unspec, there should be no more uses of struct sockaddr that
depend on reading beyond the end of struct sockaddr::sa_data that might
trigger bounds checking.
Comparing an x86_64 "allyesconfig" vmlinux build before and after this
patch showed no new "ud1" instructions from CONFIG_UBSAN_BOUNDS nor any
explicit "field-spanning" memcpy CONFIG_FORTIFY_SOURCE instrumentations.
Cc: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Signed-off-by: Kees Cook <kees@kernel.org>
5 files changed
