From: Andrey Ryabinin <aryabinin@virtuozzo.com>
To: Daniel Axtens <dja@axtens.net>, Qian Cai <cai@lca.pw>,
kasan-dev@googlegroups.com, linux-mm@kvack.org, x86@kernel.org,
glider@google.com, luto@kernel.org, linux-kernel@vger.kernel.org,
mark.rutland@arm.com, dvyukov@google.com,
christophe.leroy@c-s.fr
Cc: linuxppc-dev@lists.ozlabs.org, gor@linux.ibm.com
Subject: Re: [PATCH v11 1/4] kasan: support backing vmalloc space with real shadow memory
Date: Tue, 19 Nov 2019 12:54:08 +0300 [thread overview]
Message-ID: <952ec26a-9492-6f71-bab1-c1def887e528@virtuozzo.com> (raw)
In-Reply-To: <871ru5hnfh.fsf@dja-thinkpad.axtens.net>
On 11/18/19 6:29 AM, Daniel Axtens wrote:
> Qian Cai <cai@lca.pw> writes:
>
>> On Thu, 2019-10-31 at 20:39 +1100, Daniel Axtens wrote:
>>> /*
>>> * In this function, newly allocated vm_struct has VM_UNINITIALIZED
>>> * flag. It means that vm_struct is not fully initialized.
>>> @@ -3377,6 +3411,9 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
>>>
>>> setup_vmalloc_vm_locked(vms[area], vas[area], VM_ALLOC,
>>> pcpu_get_vm_areas);
>>> +
>>> + /* assume success here */
>>> + kasan_populate_vmalloc(sizes[area], vms[area]);
>>> }
>>> spin_unlock(&vmap_area_lock);
>>
>> Here it is all wrong. GFP_KERNEL with in_atomic().
>
> I think this fix will work, I will do a v12 with it included.
You can send just the fix. Andrew will fold it into the original patch before sending it to Linus.
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index a4b950a02d0b..bf030516258c 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -3417,11 +3417,14 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
>
> setup_vmalloc_vm_locked(vms[area], vas[area], VM_ALLOC,
> pcpu_get_vm_areas);
> + }
> + spin_unlock(&vmap_area_lock);
>
> + /* populate the shadow space outside of the lock */
> + for (area = 0; area < nr_vms; area++) {
> /* assume success here */
> kasan_populate_vmalloc(sizes[area], vms[area]);
> }
> - spin_unlock(&vmap_area_lock);
>
> kfree(vas);
> return vms;
>
>
next prev parent reply other threads:[~2019-11-19 9:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-31 9:39 [PATCH v11 0/4] kasan: support backing vmalloc space with real shadow memory Daniel Axtens
2019-10-31 9:39 ` [PATCH v11 1/4] " Daniel Axtens
2019-11-15 16:36 ` Qian Cai
2019-11-18 3:29 ` Daniel Axtens
2019-11-19 9:54 ` Andrey Ryabinin [this message]
2019-11-29 10:43 ` Dmitry Vyukov
2019-11-29 10:58 ` Dmitry Vyukov
2019-11-29 11:02 ` Dmitry Vyukov
2019-11-29 11:38 ` Andrey Ryabinin
2019-11-29 11:47 ` Dmitry Vyukov
2019-11-29 11:53 ` Andrey Ryabinin
2019-11-29 12:29 ` Daniel Axtens
2019-11-29 12:45 ` Dmitry Vyukov
2019-11-29 15:13 ` Dmitry Vyukov
2019-11-29 15:15 ` XFS check crash (WAS Re: [PATCH v11 1/4] kasan: support backing vmalloc space with real shadow memory) Qian Cai
2019-11-29 15:50 ` Daniel Axtens
2019-11-29 12:09 ` [PATCH v11 1/4] kasan: support backing vmalloc space with real shadow memory Daniel Axtens
2019-11-29 12:15 ` Dmitry Vyukov
2019-11-20 5:27 ` [PATCH] update to "kasan: support backing vmalloc space with real shadow memory" Daniel Axtens
2019-10-31 9:39 ` [PATCH v11 2/4] kasan: add test for vmalloc Daniel Axtens
2019-10-31 9:39 ` [PATCH v11 3/4] fork: support VMAP_STACK with KASAN_VMALLOC Daniel Axtens
2019-10-31 9:39 ` [PATCH v11 4/4] x86/kasan: support KASAN_VMALLOC Daniel Axtens
2019-11-08 22:36 ` [PATCH v11 0/4] kasan: support backing vmalloc space with real shadow memory Andrey Ryabinin
2019-12-02 8:07 ` Christophe Leroy
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