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From: Zheng Hacker <hackerzheng666@gmail.com>
To: xmzyshypnc <1002992920@qq.com>
Cc: alex000young@gmail.com, security@kernel.org,
	dri-devel@lists.freedesktop.org, tvrtko.ursulin@linux.intel.com,
	airlied@linux.ie, intel-gfx@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, rodrigo.vivi@intel.com,
	intel-gvt-dev@lists.freedesktop.org, zhi.a.wang@intel.com
Subject: Re: [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry.
Date: Mon, 5 Sep 2022 12:47:57 +0800	[thread overview]
Message-ID: <CAJedcCxVW++iH49UFZp9ruUuTcNubWCH6Wsqe11K4COB3E8msg@mail.gmail.com> (raw)
In-Reply-To: <tencent_E1BBF05904DFB73C478DCD592740AAE0780A@qq.com>

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Hello everyone,

I'm Zheng Wang. I found a potential double-free bug
in drivers/gpu/drm/i915/gvt/gtt.c. I haven't been replied for a long time.
So I decided to send it to more relavent supporters and developers to help
to solve the problem.

Best regards,
Zheng Wang.

xmzyshypnc <1002992920@qq.com> 于2022年9月4日周日 20:32写道:

> There is a double-free security bug in split_2MB_gtt_entry.
>
> Here is a calling chain :
> ppgtt_populate_spt->ppgtt_populate_shadow_entry->split_2MB_gtt_entry. If
> intel_gvt_dma_map_guest_page failed, it will call  ppgtt_invalidate_spt,
> which will finally call ppgtt_free_spt and kfree(spt). But the caller does
> not notice that, and it will call ppgtt_free_spt again in error path.
>
> Fix this by returning the result of ppgtt_invalidate_spt to
> split_2MB_gtt_entry.
>
> Signed-off-by: Zheng Wang <1002992920@qq.com>
> ---
>  drivers/gpu/drm/i915/gvt/gtt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.c
> b/drivers/gpu/drm/i915/gvt/gtt.c
> index ce0eb03709c3..9f14fded8c0c 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.c
> +++ b/drivers/gpu/drm/i915/gvt/gtt.c
> @@ -1215,7 +1215,7 @@ static int split_2MB_gtt_entry(struct intel_vgpu
> *vgpu,
>                 ret = intel_gvt_dma_map_guest_page(vgpu, start_gfn +
> sub_index,
>                                                    PAGE_SIZE, &dma_addr);
>                 if (ret) {
> -                       ppgtt_invalidate_spt(spt);
> +                       ret = ppgtt_invalidate_spt(spt);
>                         return ret;
>                 }
>                 sub_se.val64 = se->val64;
> --
> 2.25.1
>
>

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WARNING: multiple messages have this Message-ID (diff)
From: Zheng Hacker <hackerzheng666@gmail.com>
To: xmzyshypnc <1002992920@qq.com>
Cc: alex000young@gmail.com, security@kernel.org,
	dri-devel@lists.freedesktop.org, airlied@linux.ie,
	intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	daniel@ffwll.ch, rodrigo.vivi@intel.com,
	intel-gvt-dev@lists.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry.
Date: Mon, 5 Sep 2022 12:47:57 +0800	[thread overview]
Message-ID: <CAJedcCxVW++iH49UFZp9ruUuTcNubWCH6Wsqe11K4COB3E8msg@mail.gmail.com> (raw)
In-Reply-To: <tencent_E1BBF05904DFB73C478DCD592740AAE0780A@qq.com>

[-- Attachment #1: Type: text/plain, Size: 1719 bytes --]

Hello everyone,

I'm Zheng Wang. I found a potential double-free bug
in drivers/gpu/drm/i915/gvt/gtt.c. I haven't been replied for a long time.
So I decided to send it to more relavent supporters and developers to help
to solve the problem.

Best regards,
Zheng Wang.

xmzyshypnc <1002992920@qq.com> 于2022年9月4日周日 20:32写道:

> There is a double-free security bug in split_2MB_gtt_entry.
>
> Here is a calling chain :
> ppgtt_populate_spt->ppgtt_populate_shadow_entry->split_2MB_gtt_entry. If
> intel_gvt_dma_map_guest_page failed, it will call  ppgtt_invalidate_spt,
> which will finally call ppgtt_free_spt and kfree(spt). But the caller does
> not notice that, and it will call ppgtt_free_spt again in error path.
>
> Fix this by returning the result of ppgtt_invalidate_spt to
> split_2MB_gtt_entry.
>
> Signed-off-by: Zheng Wang <1002992920@qq.com>
> ---
>  drivers/gpu/drm/i915/gvt/gtt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.c
> b/drivers/gpu/drm/i915/gvt/gtt.c
> index ce0eb03709c3..9f14fded8c0c 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.c
> +++ b/drivers/gpu/drm/i915/gvt/gtt.c
> @@ -1215,7 +1215,7 @@ static int split_2MB_gtt_entry(struct intel_vgpu
> *vgpu,
>                 ret = intel_gvt_dma_map_guest_page(vgpu, start_gfn +
> sub_index,
>                                                    PAGE_SIZE, &dma_addr);
>                 if (ret) {
> -                       ppgtt_invalidate_spt(spt);
> +                       ret = ppgtt_invalidate_spt(spt);
>                         return ret;
>                 }
>                 sub_se.val64 = se->val64;
> --
> 2.25.1
>
>

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       reply	other threads:[~2022-09-05  6:30 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <tencent_E1BBF05904DFB73C478DCD592740AAE0780A@qq.com>
2022-09-05  4:47 ` Zheng Hacker [this message]
2022-09-05  4:47   ` [Intel-gfx] [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry Zheng Hacker
2022-09-05  6:11   ` Zheng Hacker
2022-09-05  6:11     ` [Intel-gfx] " Zheng Hacker
2022-09-05  7:35   ` Zheng Hacker
2022-09-05  7:35     ` [Intel-gfx] " Zheng Hacker
2022-09-05  7:35     ` Zheng Hacker
2022-09-05  7:46     ` Zheng Hacker
2022-09-05  7:46       ` [Intel-gfx] " Zheng Hacker
2022-09-05  7:46       ` Zheng Hacker
2022-09-05  8:04       ` Greg KH
2022-09-05  8:04         ` [Intel-gfx] " Greg KH
2022-09-05  8:04         ` Greg KH
2022-09-05  8:53         ` Alex Young
2022-09-05  8:53           ` Alex Young
2022-09-06 11:36         ` Zheng Hacker
2022-09-06 11:36           ` [Intel-gfx] " Zheng Hacker
2022-09-06 11:36           ` Zheng Hacker
2022-09-07  3:07           ` Zhenyu Wang
2022-09-07  3:07             ` [Intel-gfx] " Zhenyu Wang
2022-09-07  3:07             ` Zhenyu Wang
2022-09-07  6:47             ` Zheng Hacker
2022-09-07  6:47               ` [Intel-gfx] " Zheng Hacker
2022-09-07  6:47               ` Zheng Hacker
2022-09-08  9:09             ` Zheng Hacker
2022-09-08  9:09               ` [Intel-gfx] " Zheng Hacker
2022-09-08  9:09               ` Zheng Hacker
2022-09-08  9:19               ` Greg KH
2022-09-08  9:19                 ` [Intel-gfx] " Greg KH
2022-09-08  9:19                 ` Greg KH
2022-09-08 11:59                 ` Zheng Hacker
2022-09-08 11:59                   ` [Intel-gfx] " Zheng Hacker
2022-09-16  6:39                   ` Zheng Hacker
2022-09-16  6:39                     ` [Intel-gfx] " Zheng Hacker
2022-09-16  6:39                     ` Zheng Hacker
2022-09-16  6:40                     ` Zheng Hacker
2022-09-16  6:40                       ` [Intel-gfx] " Zheng Hacker
2022-09-16  6:40                       ` Zheng Hacker
2022-09-16  8:25                     ` Greg KH
2022-09-16  8:25                       ` [Intel-gfx] " Greg KH
2022-09-16  8:25                       ` Greg KH
2022-09-16 15:21                       ` Zheng Hacker
2022-09-16 15:21                         ` [Intel-gfx] " Zheng Hacker
2022-09-16 15:21                         ` Zheng Hacker
2022-09-16 15:54                       ` Zheng Hacker
2022-09-16 15:54                         ` [Intel-gfx] " Zheng Hacker
2022-09-16 15:54                         ` Zheng Hacker
2022-09-17  9:08                         ` Greg KH
2022-09-17  9:08                           ` [Intel-gfx] " Greg KH
2022-09-17  9:08                           ` Greg KH
2022-09-17  9:10                           ` Zheng Hacker
2022-09-17  9:10                             ` [Intel-gfx] " Zheng Hacker
2022-09-18 17:08                           ` =?gb18030?B?s68=?=
2022-09-18 17:08                             ` [Intel-gfx] " =?gb18030?B?s68=?=
2022-09-18 17:17                           ` Zheng Hacker
2022-09-18 17:17                             ` [Intel-gfx] " Zheng Hacker
2022-09-18 17:17                             ` Zheng Hacker
2022-09-19 20:16   ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for " Patchwork
2022-09-06 12:58 ` Patchwork
2022-09-06 14:22   ` Zheng Hacker
2022-09-06 14:29   ` Zheng Hacker
2022-09-19 20:20 ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for ✗ Fi.CI.BUILD: failure for drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry. (rev3) Patchwork
2022-09-18 19:24 [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry Zheng Wang
2022-09-19  9:30 ` Jani Nikula
2022-09-19  9:55   ` Zheng Hacker
2022-09-19  9:55     ` Zheng Hacker
2022-09-21  9:13   ` Zheng Hacker
2022-09-21  9:13     ` Zheng Hacker

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