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@xxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxx>
> ec: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Cc: Shuah Khan <shuah@xxxxxxxxxx>
> Cc: linux-kselftest@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: x86@xxxxxxxxxx
> ---
>
> 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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