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lkdtm: clean up sparse warnings

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Since lkdtm intentionally does "bad" things, we need to convince sparse
that we're doing these things on purpose. This adds an explicit cast
to the call to copy_to_user() and marks the spin lock as expecting
to dead-lock.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2013-11-11 11:23:49 -08:00 committed by Greg Kroah-Hartman
parent 36fe66c164
commit 5123662adc
1 changed files with 4 additions and 1 deletions
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5
drivers/misc/lkdtm.c
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@ -334,9 +334,10 @@ static void execute_location(void *dst)
static void execute_user_location(void *dst)
{
/* Intentionally crossing kernel/user memory boundary. */
void (*func)(void) = dst;
if (copy_to_user(dst, do_nothing, EXEC_SIZE))
if (copy_to_user((void __user *)dst, do_nothing, EXEC_SIZE))
return;
func();
}
@ -408,6 +409,8 @@ static void lkdtm_do_action(enum ctype which)
case CT_SPINLOCKUP:
/* Must be called twice to trigger. */
spin_lock(&lock_me_up);
/* Let sparse know we intended to exit holding the lock. */
__release(&lock_me_up);
break;
case CT_HUNG_TASK:
set_current_state(TASK_UNINTERRUPTIBLE);