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Eric DumazetandGreg Kroah-Hartman
fa66c02e4c
[ Upstream commit5f1eb1ff58] This is a followup of commit2558b8039d("net: use a bounce buffer for copying skb->mark") x86 and powerpc define user_access_begin, meaning that they are not able to perform user copy checks when using user_write_access_begin() / unsafe_copy_to_user() and friends [1] Instead of waiting bugs to trigger on other arches, add a check_object_size() in put_cmsg() to make sure that new code tested on x86 with CONFIG_HARDENED_USERCOPY=y will perform more security checks. [1] We can not generically call check_object_size() from unsafe_copy_to_user() because UACCESS is enabled at this point. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Kees Cook <keescook@chromium.org> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>