BACKPORT: lkdtm: add bad USER_DS test
(cherry-picked from e22aa9d781a27a961581c57442911309fb86a48e) This adds CORRUPT_USER_DS to check that the get_fs() test on syscall return (via __VERIFY_PRE_USERMODE_STATE) still sees USER_DS. Since trying to deal with values other than USER_DS and KERNEL_DS across all architectures in a safe way is not sensible, this sets KERNEL_DS, but since that could be extremely dangerous if the protection is not present, it also raises SIGKILL for current, so that no matter what, the process will die. A successful test will be visible with a BUG(), like all the other LKDTM tests. Change-Id: I8fab22ce9cf9ef44028ce712f58bcfe4b2821929 Signed-off-by:Kees Cook <keescook@chromium.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Satya Tangirala <satyat@google.com>
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