linux-hardening - Re: [PATCH 2/2] test_overflow: Regularize test reporting output

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Date:   Tue, 21 Sep 2021 08:56:20 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Keith Busch <kbusch@...nel.org>, Len Baker <len.baker@....com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 2/2] test_overflow: Regularize test reporting output

On 21/09/2021 00.10, Nick Desaulniers wrote:
> On Mon, Sep 20, 2021 at 11:09 AM Kees Cook <keescook@...omium.org> wrote:
>>

>> @@ -544,10 +544,7 @@ DEFINE_TEST_ALLOC(kmalloc,  kfree,      0, 1, 0);
>>  DEFINE_TEST_ALLOC(kmalloc_node,         kfree,      0, 1, 1);
>>  DEFINE_TEST_ALLOC(kzalloc,      kfree,      0, 1, 0);
>>  DEFINE_TEST_ALLOC(kzalloc_node,  kfree,             0, 1, 1);
>> -DEFINE_TEST_ALLOC(vmalloc,      vfree,      0, 0, 0);
>> -DEFINE_TEST_ALLOC(vmalloc_node,  vfree,             0, 0, 1);
>> -DEFINE_TEST_ALLOC(vzalloc,      vfree,      0, 0, 0);
>> -DEFINE_TEST_ALLOC(vzalloc_node,  vfree,             0, 0, 1);
>> +DEFINE_TEST_ALLOC(__vmalloc,    vfree,      0, 1, 0);
>>  DEFINE_TEST_ALLOC(kvmalloc,     kvfree,     0, 1, 0);
>>  DEFINE_TEST_ALLOC(kvmalloc_node, kvfree,     0, 1, 1);
>>  DEFINE_TEST_ALLOC(kvzalloc,     kvfree,     0, 1, 0);
>> @@ -559,8 +556,14 @@ static int __init test_overflow_allocation(void)
>>  {
>>         const char device_name[] = "overflow-test";
>>         struct device *dev;
>> +       int count = 0;
>>         int err = 0;
>>
>> +#define check_allocation_overflow(alloc)       ({      \
>> +       count++;                                        \
>> +       test_ ## alloc(dev);                            \
>> +})
>> +
>>         /* Create dummy device for devm_kmalloc()-family tests. */
>>         dev = root_device_register(device_name);
>>         if (IS_ERR(dev)) {
>> @@ -568,23 +571,22 @@ static int __init test_overflow_allocation(void)
>>                 return 1;
>>         }
>>
>> -       err |= test_kmalloc(NULL);
>> -       err |= test_kmalloc_node(NULL);
>> -       err |= test_kzalloc(NULL);
>> -       err |= test_kzalloc_node(NULL);
>> -       err |= test_kvmalloc(NULL);
>> -       err |= test_kvmalloc_node(NULL);
>> -       err |= test_kvzalloc(NULL);
>> -       err |= test_kvzalloc_node(NULL);
>> -       err |= test_vmalloc(NULL);
>> -       err |= test_vmalloc_node(NULL);
>> -       err |= test_vzalloc(NULL);
>> -       err |= test_vzalloc_node(NULL);
>> -       err |= test_devm_kmalloc(dev);
>> -       err |= test_devm_kzalloc(dev);
>> +       err |= check_allocation_overflow(kmalloc);
>> +       err |= check_allocation_overflow(kmalloc_node);
>> +       err |= check_allocation_overflow(kzalloc);
>> +       err |= check_allocation_overflow(kzalloc_node);
>> +       err |= check_allocation_overflow(__vmalloc);
>> +       err |= check_allocation_overflow(kvmalloc);
>> +       err |= check_allocation_overflow(kvmalloc_node);
>> +       err |= check_allocation_overflow(kvzalloc);
>> +       err |= check_allocation_overflow(kvzalloc_node);
>> +       err |= check_allocation_overflow(devm_kmalloc);
>> +       err |= check_allocation_overflow(devm_kzalloc);
>>
>>         device_unregister(dev);

I'd prefer if such a local helper macro was defined immediately prior to
the sequence of uses, and then #undef'ed at the end.

Other than that:

Acked-by: Rasmus Villemoes <linux@...musvillemoes.dk>