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Message-Id: <20210920180853.1825195-3-keescook@chromium.org>
Date: Mon, 20 Sep 2021 11:08:53 -0700
From: Kees Cook <keescook@...omium.org>
To: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Kees Cook <keescook@...omium.org>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Jason Gunthorpe <jgg@...pe.ca>,
Nick Desaulniers <ndesaulniers@...gle.com>,
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: [PATCH 2/2] test_overflow: Regularize test reporting output
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>
---
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
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