linux-kernel - Re: [RFC 3/3] lib: Convert test_user

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Date:   Thu, 16 Jul 2020 13:42:20 -0300
From:   Vitor Massaru Iha <vitor@...saru.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, brendanhiggins@...gle.com,
        davidgow@...gle.com, skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [RFC 3/3] lib: Convert test_user_copy to KUnit test

On Wed, 2020-07-15 at 19:34 -0700, Kees Cook wrote:
> On Wed, Jul 15, 2020 at 12:11:20AM -0300, Vitor Massaru Iha wrote:
> > This adds the conversion of the runtime tests of test_user_copy
> > fuctions,
> > from `lib/test_user_copy.c`to KUnit tests.
> > 
> > Signed-off-by: Vitor Massaru Iha <vitor@...saru.org>
> > [...]
> > @@ -16,6 +16,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/uaccess.h>
> >  #include <linux/vmalloc.h>
> > +#include <kunit/test.h>
> >  
> >  /*
> >   * Several 32-bit architectures support 64-bit {get,put}_user()
> > calls.
> > @@ -31,26 +32,16 @@
> >  # define TEST_U64
> >  #endif
> >  
> > -#define test(condition, msg, ...)					
> > \
> > -({									
> > \
> > -	int cond = (condition);						
> > \
> > -	if (cond)							\
> > -		pr_warn("[%d] " msg "\n", __LINE__, ##__VA_ARGS__);	\
> > -	cond;								
> > \
> > -})
> > -
> >  static bool is_zeroed(void *from, size_t size)
> >  {
> >  	return memchr_inv(from, 0x0, size) == NULL;
> >  }
> >  
> > -static int test_check_nonzero_user(char *kmem, char __user *umem,
> > size_t size)
> > +static void test_check_nonzero_user(struct kunit *test, char
> > *kmem, char __user *umem, size_t size)
> >  {
> > -	int ret = 0;
> >  	size_t start, end, i, zero_start, zero_end;
> >  
> > -	if (test(size < 2 * PAGE_SIZE, "buffer too small"))
> > -		return -EINVAL;
> > +	KUNIT_EXPECT_FALSE_MSG(test, size < 2 * PAGE_SIZE, "buffer too
> > small");
> 
> I think this could be a much smaller diff if you just replaced the
> "test" macro:
> 
> #define test(condition, msg, ...)					
> \
> ({									
> \
> 	int cond = !!(condition);					\
> 	KUNIT_EXPECT_FALSE_MSG(kunit_context, cond, msg,
> ##__VA_ARGS__);\
> 	cond;								
> \
> })
> 

Sure, I'll do it.

Thanks.