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Re: [PATCH 2/2] selftests, x86, pkeys: test with random, unallocated protection keys

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On 02/23/2017 03:26 PM, Dave Hansen wrote:
> Shuah, I assume you'll take this patch in through the selftests tree.

Yes I can do that.

-- Shuah

> 
> --
> From: Dave Hansen <dave.hansen@linux.intel.com>
> 
> The kernel pkeys code had a minor bug where it did some large shifts
> to an integer which is undefined behavior in C.  It didn't cause any
> real harm, but it is screwy behavior that the kernel should have
> rejected.
> 
> Add a test case for this.
> 
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
> ec: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Shuah Khan <shuah@kernel.org>
> Cc: linux-kselftest@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: x86@kernel.org
> ---
> 
>  b/tools/testing/selftests/x86/protection_keys.c |   25 ++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff -puN tools/testing/selftests/x86/protection_keys.c~pkeys-better-selftests-of-random-pkey tools/testing/selftests/x86/protection_keys.c
> --- a/tools/testing/selftests/x86/protection_keys.c~pkeys-better-selftests-of-random-pkey	2017-02-23 14:21:05.168391529 -0800
> +++ b/tools/testing/selftests/x86/protection_keys.c	2017-02-23 14:23:03.244671815 -0800
> @@ -1123,6 +1123,30 @@ void test_pkey_syscalls_on_non_allocated
>  }
>  
>  /* Assumes that all pkeys other than 'pkey' are unallocated */
> +void test_pkey_syscalls_on_non_allocated_random_pkey(int *ptr, u16 pkey)
> +{
> +	int err;
> +	int nr_tests = 0;
> +
> +	while (nr_tests < 1000) {
> +		int test_pkey = rand();
> +
> +		/* do not test with the pkey we know is good */
> +		if (pkey == test_pkey)
> +			continue;
> +
> +		dprintf1("trying free/mprotect bad pkey: %2d\n", test_pkey);
> +		err = sys_pkey_free(test_pkey);
> +		pkey_assert(err);
> +
> +		err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, test_pkey);
> +		pkey_assert(err);
> +
> +		nr_tests++;
> +	}
> +}
> +
> +/* Assumes that all pkeys other than 'pkey' are unallocated */
>  void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
>  {
>  	int err;
> @@ -1320,6 +1344,7 @@ void (*pkey_tests[])(int *ptr, u16 pkey)
>  	test_executing_on_unreadable_memory,
>  	test_ptrace_of_child,
>  	test_pkey_syscalls_on_non_allocated_pkey,
> +	test_pkey_syscalls_on_non_allocated_random_pkey,
>  	test_pkey_syscalls_bad_args,
>  	test_pkey_alloc_exhaust,
>  };
> _
> 
> 

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[PATCH 2/2] selftests, x86, pkeys: test with random, unallocated protection keys Dave Hansen <dave.hansen@linux.intel.com> - 2017-02-23 23:30 +0100
  Re: [PATCH 2/2] selftests, x86, pkeys: test with random, unallocated  protection keys Shuah Khan <shuah@kernel.org> - 2017-02-23 23:40 +0100
    Re: [PATCH 2/2] selftests, x86, pkeys: test with random, unallocated  protection keys Ingo Molnar <mingo@kernel.org> - 2017-02-24 08:50 +0100
      Re: [PATCH 2/2] selftests, x86, pkeys: test with random, unallocated  protection keys Shuah Khan <shuah@kernel.org> - 2017-02-24 16:00 +0100
        Re: [PATCH 2/2] selftests, x86, pkeys: test with random, unallocated  protection keys Ingo Molnar <mingo@kernel.org> - 2017-02-25 10:20 +0100
  Re: [PATCH 2/2] selftests, x86, pkeys: test with random, unallocated  protection keys "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-02-24 01:20 +0100

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