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From: Zheng Hacker <hackerzheng666@gmail.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>,
	"alex000young@gmail.com" <alex000young@gmail.com>,
	"security@kernel.org" <security@kernel.org>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>,
	"tvrtko.ursulin@linux.intel.com" <tvrtko.ursulin@linux.intel.com>,
	"airlied@linux.ie" <airlied@linux.ie>,
	"intel-gfx@lists.freedesktop.org"
	<intel-gfx@lists.freedesktop.org>,
	"joonas.lahtinen@linux.intel.com"
	<joonas.lahtinen@linux.intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	xmzyshypnc <1002992920@qq.com>,
	"jani.nikula@linux.intel.com" <jani.nikula@linux.intel.com>,
	"daniel@ffwll.ch" <daniel@ffwll.ch>,
	"rodrigo.vivi@intel.com" <rodrigo.vivi@intel.com>,
	"intel-gvt-dev@lists.freedesktop.org" 
	<intel-gvt-dev@lists.freedesktop.org>,
	"zhi.a.wang@intel.com" <zhi.a.wang@intel.com>
Subject: Re: [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry.
Date: Fri, 16 Sep 2022 23:54:42 +0800	[thread overview]
Message-ID: <CAJedcCzt_1ZRV5egMLdoFVZ4hBDE+nDu9fLkBuGY0A=uYicvQA@mail.gmail.com> (raw)
In-Reply-To: <YyQzDlM5n7mOLh5Q@kroah.com>

From afe79848cb74cc8e45ab426d13fa2394c87e0422 Mon Sep 17 00:00:00 2001
From: xmzyshypnc <1002992920@qq.com>
Date: Fri, 16 Sep 2022 23:48:23 +0800
Subject: [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry

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 only freeing spt in ppgtt_invalidate_spt in good case.

Signed-off-by: Zheng Wang <hackerzheng666@gmail.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index ce0eb03709c3..550519f0acca 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -959,7 +959,7 @@ static inline int ppgtt_put_spt(struct
intel_vgpu_ppgtt_spt *spt)
    return atomic_dec_return(&spt->refcount);
 }

-static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt);
+static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt, int
is_error);

 static int ppgtt_invalidate_spt_by_shadow_entry(struct intel_vgpu *vgpu,
        struct intel_gvt_gtt_entry *e)
@@ -995,7 +995,7 @@ static int
ppgtt_invalidate_spt_by_shadow_entry(struct intel_vgpu *vgpu,
                ops->get_pfn(e));
        return -ENXIO;
    }
-   return ppgtt_invalidate_spt(s);
+   return ppgtt_invalidate_spt(s, 0);
 }

 static inline void ppgtt_invalidate_pte(struct intel_vgpu_ppgtt_spt *spt,
@@ -1016,7 +1016,7 @@ static inline void ppgtt_invalidate_pte(struct
intel_vgpu_ppgtt_spt *spt,
    intel_gvt_dma_unmap_guest_page(vgpu, pfn << PAGE_SHIFT);
 }

-static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt)
+static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt, int is_error)
 {
    struct intel_vgpu *vgpu = spt->vgpu;
    struct intel_gvt_gtt_entry e;
@@ -1059,9 +1059,11 @@ static int ppgtt_invalidate_spt(struct
intel_vgpu_ppgtt_spt *spt)
        }
    }

-   trace_spt_change(spt->vgpu->id, "release", spt,
+   if (!is_error) {
+       trace_spt_change(spt->vgpu->id, "release", spt,
             spt->guest_page.gfn, spt->shadow_page.type);
-   ppgtt_free_spt(spt);
+       ppgtt_free_spt(spt);
+   }
    return 0;
 fail:
    gvt_vgpu_err("fail: shadow page %p shadow entry 0x%llx type %d\n",
@@ -1215,7 +1217,7 @@ 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);
+           ppgtt_invalidate_spt(spt, 1);
            return ret;
        }
        sub_se.val64 = se->val64;
@@ -1393,7 +1395,7 @@ static int
ppgtt_handle_guest_entry_removal(struct intel_vgpu_ppgtt_spt *spt,
            ret = -ENXIO;
            goto fail;
        }
-       ret = ppgtt_invalidate_spt(s);
+       ret = ppgtt_invalidate_spt(s, 0);
        if (ret)
            goto fail;
    } else {
-- 
2.25.1

WARNING: multiple messages have this Message-ID (diff)
From: Zheng Hacker <hackerzheng666@gmail.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: "alex000young@gmail.com" <alex000young@gmail.com>,
	"security@kernel.org" <security@kernel.org>,
	"tvrtko.ursulin@linux.intel.com" <tvrtko.ursulin@linux.intel.com>,
	"airlied@linux.ie" <airlied@linux.ie>,
	"intel-gfx@lists.freedesktop.org"
	<intel-gfx@lists.freedesktop.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>, xmzyshypnc <1002992920@qq.com>,
	"rodrigo.vivi@intel.com" <rodrigo.vivi@intel.com>,
	"intel-gvt-dev@lists.freedesktop.org"
	<intel-gvt-dev@lists.freedesktop.org>,
	"zhi.a.wang@intel.com" <zhi.a.wang@intel.com>
Subject: Re: [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry.
Date: Fri, 16 Sep 2022 23:54:42 +0800	[thread overview]
Message-ID: <CAJedcCzt_1ZRV5egMLdoFVZ4hBDE+nDu9fLkBuGY0A=uYicvQA@mail.gmail.com> (raw)
In-Reply-To: <YyQzDlM5n7mOLh5Q@kroah.com>

From afe79848cb74cc8e45ab426d13fa2394c87e0422 Mon Sep 17 00:00:00 2001
From: xmzyshypnc <1002992920@qq.com>
Date: Fri, 16 Sep 2022 23:48:23 +0800
Subject: [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry

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 only freeing spt in ppgtt_invalidate_spt in good case.

Signed-off-by: Zheng Wang <hackerzheng666@gmail.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index ce0eb03709c3..550519f0acca 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -959,7 +959,7 @@ static inline int ppgtt_put_spt(struct
intel_vgpu_ppgtt_spt *spt)
    return atomic_dec_return(&spt->refcount);
 }

-static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt);
+static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt, int
is_error);

 static int ppgtt_invalidate_spt_by_shadow_entry(struct intel_vgpu *vgpu,
        struct intel_gvt_gtt_entry *e)
@@ -995,7 +995,7 @@ static int
ppgtt_invalidate_spt_by_shadow_entry(struct intel_vgpu *vgpu,
                ops->get_pfn(e));
        return -ENXIO;
    }
-   return ppgtt_invalidate_spt(s);
+   return ppgtt_invalidate_spt(s, 0);
 }

 static inline void ppgtt_invalidate_pte(struct intel_vgpu_ppgtt_spt *spt,
@@ -1016,7 +1016,7 @@ static inline void ppgtt_invalidate_pte(struct
intel_vgpu_ppgtt_spt *spt,
    intel_gvt_dma_unmap_guest_page(vgpu, pfn << PAGE_SHIFT);
 }

-static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt)
+static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt, int is_error)
 {
    struct intel_vgpu *vgpu = spt->vgpu;
    struct intel_gvt_gtt_entry e;
@@ -1059,9 +1059,11 @@ static int ppgtt_invalidate_spt(struct
intel_vgpu_ppgtt_spt *spt)
        }
    }

-   trace_spt_change(spt->vgpu->id, "release", spt,
+   if (!is_error) {
+       trace_spt_change(spt->vgpu->id, "release", spt,
             spt->guest_page.gfn, spt->shadow_page.type);
-   ppgtt_free_spt(spt);
+       ppgtt_free_spt(spt);
+   }
    return 0;
 fail:
    gvt_vgpu_err("fail: shadow page %p shadow entry 0x%llx type %d\n",
@@ -1215,7 +1217,7 @@ 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);
+           ppgtt_invalidate_spt(spt, 1);
            return ret;
        }
        sub_se.val64 = se->val64;
@@ -1393,7 +1395,7 @@ static int
ppgtt_handle_guest_entry_removal(struct intel_vgpu_ppgtt_spt *spt,
            ret = -ENXIO;
            goto fail;
        }
-       ret = ppgtt_invalidate_spt(s);
+       ret = ppgtt_invalidate_spt(s, 0);
        if (ret)
            goto fail;
    } else {
-- 
2.25.1

WARNING: multiple messages have this Message-ID (diff)
From: Zheng Hacker <hackerzheng666@gmail.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: "alex000young@gmail.com" <alex000young@gmail.com>,
	"security@kernel.org" <security@kernel.org>,
	"airlied@linux.ie" <airlied@linux.ie>,
	"intel-gfx@lists.freedesktop.org"
	<intel-gfx@lists.freedesktop.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>, xmzyshypnc <1002992920@qq.com>,
	"daniel@ffwll.ch" <daniel@ffwll.ch>,
	"rodrigo.vivi@intel.com" <rodrigo.vivi@intel.com>,
	"intel-gvt-dev@lists.freedesktop.org"
	<intel-gvt-dev@lists.freedesktop.org>
Subject: Re: [Intel-gfx] [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry.
Date: Fri, 16 Sep 2022 23:54:42 +0800	[thread overview]
Message-ID: <CAJedcCzt_1ZRV5egMLdoFVZ4hBDE+nDu9fLkBuGY0A=uYicvQA@mail.gmail.com> (raw)
In-Reply-To: <YyQzDlM5n7mOLh5Q@kroah.com>

From afe79848cb74cc8e45ab426d13fa2394c87e0422 Mon Sep 17 00:00:00 2001
From: xmzyshypnc <1002992920@qq.com>
Date: Fri, 16 Sep 2022 23:48:23 +0800
Subject: [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry

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 only freeing spt in ppgtt_invalidate_spt in good case.

Signed-off-by: Zheng Wang <hackerzheng666@gmail.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index ce0eb03709c3..550519f0acca 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -959,7 +959,7 @@ static inline int ppgtt_put_spt(struct
intel_vgpu_ppgtt_spt *spt)
    return atomic_dec_return(&spt->refcount);
 }

-static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt);
+static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt, int
is_error);

 static int ppgtt_invalidate_spt_by_shadow_entry(struct intel_vgpu *vgpu,
        struct intel_gvt_gtt_entry *e)
@@ -995,7 +995,7 @@ static int
ppgtt_invalidate_spt_by_shadow_entry(struct intel_vgpu *vgpu,
                ops->get_pfn(e));
        return -ENXIO;
    }
-   return ppgtt_invalidate_spt(s);
+   return ppgtt_invalidate_spt(s, 0);
 }

 static inline void ppgtt_invalidate_pte(struct intel_vgpu_ppgtt_spt *spt,
@@ -1016,7 +1016,7 @@ static inline void ppgtt_invalidate_pte(struct
intel_vgpu_ppgtt_spt *spt,
    intel_gvt_dma_unmap_guest_page(vgpu, pfn << PAGE_SHIFT);
 }

-static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt)
+static int ppgtt_invalidate_spt(struct intel_vgpu_ppgtt_spt *spt, int is_error)
 {
    struct intel_vgpu *vgpu = spt->vgpu;
    struct intel_gvt_gtt_entry e;
@@ -1059,9 +1059,11 @@ static int ppgtt_invalidate_spt(struct
intel_vgpu_ppgtt_spt *spt)
        }
    }

-   trace_spt_change(spt->vgpu->id, "release", spt,
+   if (!is_error) {
+       trace_spt_change(spt->vgpu->id, "release", spt,
             spt->guest_page.gfn, spt->shadow_page.type);
-   ppgtt_free_spt(spt);
+       ppgtt_free_spt(spt);
+   }
    return 0;
 fail:
    gvt_vgpu_err("fail: shadow page %p shadow entry 0x%llx type %d\n",
@@ -1215,7 +1217,7 @@ 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);
+           ppgtt_invalidate_spt(spt, 1);
            return ret;
        }
        sub_se.val64 = se->val64;
@@ -1393,7 +1395,7 @@ static int
ppgtt_handle_guest_entry_removal(struct intel_vgpu_ppgtt_spt *spt,
            ret = -ENXIO;
            goto fail;
        }
-       ret = ppgtt_invalidate_spt(s);
+       ret = ppgtt_invalidate_spt(s, 0);
        if (ret)
            goto fail;
    } else {
-- 
2.25.1

  parent reply	other threads:[~2022-09-16 15:55 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 ` [PATCH] drm/i915/gvt: fix double-free bug in split_2MB_gtt_entry Zheng Hacker
2022-09-05  4:47   ` [Intel-gfx] " 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 [this message]
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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