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Message-ID: <20220128144801.73f5ced0@canb.auug.org.au>
Date: Fri, 28 Jan 2022 14:48:01 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
Kees Cook <keescook@...omium.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the akpm-current tree
Hi all,
After merging the akpm-current tree, today's linux-next build (x86_64
allmodconfig) failed like this:
lib/test_kasan.c: In function 'vmalloc_oob':
lib/test_kasan.c:1113:71: error: array subscript 2035 is outside array bounds of 'char[2035]' [-Werror=array-bounds]
1113 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_ptr)[size]);
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
lib/test_kasan.c:96:9: note: in definition of macro 'KUNIT_EXPECT_KASAN_FAIL'
96 | expression; \
| ^~~~~~~~~~
lib/test_kasan.c:1096:17: note: referencing an object of size 2035 allocated by 'vmalloc'
1096 | v_ptr = vmalloc(size);
| ^~~~~~~~~~~~~
lib/test_kasan.c:1116:63: error: array subscript 2040 is outside array bounds of 'char[2035]' [-Werror=array-bounds]
1116 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_ptr)[size + 5]);
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
lib/test_kasan.c:96:9: note: in definition of macro 'KUNIT_EXPECT_KASAN_FAIL'
96 | expression; \
| ^~~~~~~~~~
lib/test_kasan.c:1096:17: note: referencing an object of size 2035 allocated by 'vmalloc'
1096 | v_ptr = vmalloc(size);
| ^~~~~~~~~~~~~
Caused by commit
96304a5b9bff ("kasan: improve vmalloc tests")
interacting with commit
d4e0dad4a0cd ("Makefile: Enable -Warray-bounds")
from the kspp tree.
Since the KASAN tests are doing this deliberately, I added the below
hack for today. Is there something better?
From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Fri, 28 Jan 2022 14:40:24 +1100
Subject: [PATCH] similar to "kasan: test: fix compatibility with
FORTIFY_SOURCE"
Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
lib/test_kasan.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 9dd767d05235..c07132c857e7 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -1096,6 +1096,8 @@ static void vmalloc_oob(struct kunit *test)
v_ptr = vmalloc(size);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr);
+ OPTIMIZER_HIDE_VAR(v_ptr);
+
/*
* We have to be careful not to hit the guard page in vmalloc tests.
* The MMU will catch that and crash us.
--
2.34.1
--
Cheers,
Stephen Rothwell
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