tree 7363ffc1fedd9c824eebb0f486f99c9f37301c8f
parent ba13b75c62a2fb93bcf611196c0ab02415e7e55c
author Daniel Micay <danielmicay@gmail.com> 1505419974 -0700
committer Vikram Mulukutla <markivx@codeaurora.org> 1509124477 -0700

replace incorrect strscpy use in FORTIFY_SOURCE

Using strscpy was wrong because FORTIFY_SOURCE is passing the maximum
possible size of the outermost object, but strscpy defines the count
parameter as the exact buffer size, so this could copy past the end of
the source.  This would still be wrong with the planned usage of
__builtin_object_size(p, 1) for intra-object overflow checks since it's
the maximum possible size of the specified object with no guarantee of
it being that large.

Reuse of the fortified functions like this currently makes the runtime
error reporting less precise but that can be improved later on.

Noticed by Dave Jones and KASAN.

Change-Id: I559abc94e1fd8acaa97cfc2c23d454caa43ce804
Signed-off-by: Daniel Micay <danielmicay@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: 077d2ba519b2e8bf1abd80cbade699b1de42cafe
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>