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Commit ba9f901c authored by Kees Cook's avatar Kees Cook Committed by Satya Tangirala
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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: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSatya Tangirala <satyat@google.com>
parent eb235bf1
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