linux-kernel - Re: BUG: KASAN lib/test

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Message-ID: <CANpmjNMCiCf9w34duqGpQ90=qB4QGnRR8Xny+wOVf=2WG=JVoA@mail.gmail.com>
Date:   Fri, 4 Dec 2020 21:29:38 +0100
From:   Marco Elver <elver@...gle.com>
To:     Jeffrin Jose T <jeffrin@...agiritech.edu.in>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: BUG: KASAN lib/test_kasan.c

On Fri, 4 Dec 2020 at 19:56, Jeffrin Jose T <jeffrin@...agiritech.edu.in> wrote:
> hello,
>
>  detected   KASAN   BUG
>
> [ related information ]
>
> -------------------x-------------------x------------------------>
> [   43.616259] BUG: KASAN: vmalloc-out-of-bounds in
> vmalloc_oob+0x146/0x2c0
>
> (gdb) l *vmalloc_oob+0x146/0x2c0
> 0xffffffff81b8b0b0 is in vmalloc_oob (lib/test_kasan.c:764).

This is the KASAN test. It's a feature, not a bug. ;-)

> 759             kfree_sensitive(ptr);
> 760             KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr));
> 761     }
> 762
> 763     static void vmalloc_oob(struct kunit *test)
> 764     {
> 765             void *area;
> 766
> 767             if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
> 768                     kunit_info(test, "CONFIG_KASAN_VMALLOC is not
> enabled.");
> (gdb) l *vmalloc_oob+0x146
> 0xffffffff81b8b1f6 is in vmalloc_oob (lib/test_kasan.c:779).
> 774              * The MMU will catch that and crash us.
> 775              */
> 776             area = vmalloc(3000);
> 777             KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area);
> 778
> 779             KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char
> *)area)[3100]);
> 780             vfree(area);
> 781     }
> 782
> 783     static struct kunit_case kasan_kunit_test_cases[] = {
> ----------------x-----------------------------x-------------------->
>
> Reported by: Jeffrin Jose T <jeffrin@...agiritech.edu.in>

Which CI system is reporting these?

If you look, this is the KASAN test, and the report is very much
intended since it's testing KASAN. Please blacklist the KASAN test
(and any other tests testing debugging tools).

Thanks,
-- Marco