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Date: Mon, 20 Sep 2021 15:10:37 -0700
From: Nick Desaulniers <ndesaulniers@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>,
"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 Mon, Sep 20, 2021 at 11:09 AM Kees Cook <keescook@...omium.org> wrote:
>
> Report test run summaries more regularly, so it's easier to understand
> the output:
> - Remove noisy "ok" reports for shift and allocator tests.
> - Reorganize per-type output to the end of each type's tests.
> - Replace redundant vmalloc tests with __vmalloc so that __GFP_NO_WARN
> can be used to keep the expected failure warnings out of dmesg,
> similar to commit 8e060c21ae2c ("lib/test_overflow.c: avoid tainting
> the kernel and fix wrap size")
>
> Resulting output:
>
> test_overflow: 18 u8 arithmetic tests finished
> test_overflow: 19 s8 arithmetic tests finished
> test_overflow: 17 u16 arithmetic tests finished
> test_overflow: 17 s16 arithmetic tests finished
> test_overflow: 17 u32 arithmetic tests finished
> test_overflow: 17 s32 arithmetic tests finished
> test_overflow: 17 u64 arithmetic tests finished
> test_overflow: 21 s64 arithmetic tests finished
> test_overflow: 113 shift tests finished
> test_overflow: 17 overflow size helper tests finished
> test_overflow: 11 allocation overflow tests finished
> test_overflow: all tests passed
>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Signed-off-by: Kees Cook <keescook@...omium.org>
Much appreciated!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
> lib/test_overflow.c | 50 +++++++++++++++++++++++----------------------
> 1 file changed, 26 insertions(+), 24 deletions(-)
>
> diff --git a/lib/test_overflow.c b/lib/test_overflow.c
> index 01a469ff7ff6..e1fd2d72dc61 100644
> --- a/lib/test_overflow.c
> +++ b/lib/test_overflow.c
> @@ -252,10 +252,10 @@ static int __init test_ ## t ## _overflow(void) { \
> int err = 0; \
> unsigned i; \
> \
> - pr_info("%-3s: %zu arithmetic tests\n", #t, \
> - ARRAY_SIZE(t ## _tests)); \
> for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \
> err |= do_test_ ## t(&t ## _tests[i]); \
> + pr_info("%zu %s arithmetic tests finished\n", \
> + ARRAY_SIZE(t ## _tests), #t); \
> return err; \
> }
>
> @@ -291,6 +291,7 @@ static int __init test_overflow_calculation(void)
> static int __init test_overflow_shift(void)
> {
> int err = 0;
> + int count = 0;
>
> /* Args are: value, shift, type, expected result, overflow expected */
> #define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \
> @@ -313,9 +314,7 @@ static int __init test_overflow_shift(void)
> pr_warn("got %llu\n", (u64)__d); \
> __failed = 1; \
> } \
> - if (!__failed) \
> - pr_info("ok: (%s)(%s << %s) == %s\n", #t, #a, #s, \
> - of ? "overflow" : #expect); \
> + count++; \
> __failed; \
> })
>
> @@ -479,6 +478,8 @@ static int __init test_overflow_shift(void)
> err |= TEST_ONE_SHIFT(0, 31, s32, 0, false);
> err |= TEST_ONE_SHIFT(0, 63, s64, 0, false);
>
> + pr_info("%d shift tests finished\n", count);
> +
> return err;
> }
>
> @@ -530,7 +531,6 @@ static int __init test_ ## func (void *arg) \
> free ## want_arg (free_func, arg, ptr); \
> return 1; \
> } \
> - pr_info(#func " detected saturation\n"); \
> return 0; \
> }
>
> @@ -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);
>
> + pr_info("%d allocation overflow tests finished\n", count);
> +
> return err;
> }
>
> --
> 2.30.2
>
--
Thanks,
~Nick Desaulniers
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