From: Qu Huang <jinsdb@126.com>
To: alexander.deucher@amd.com, christian.koenig@amd.com,
airlied@linux.ie, daniel@ffwll.ch, sumit.semwal@linaro.org,
airlied@redhat.com, ray.huang@amd.com, Mihir.Patel@amd.com,
nirmoy.aiemd@gmail.com
Cc: jinsdb@126.com, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org,
amd-gfx@lists.freedesktop.org, linux-media@vger.kernel.org
Subject: [PATCH] drm/amdgpu: Fix a potential sdma invalid access
Date: Fri, 2 Apr 2021 11:18:47 +0800 [thread overview]
Message-ID: <1617333527-89782-1-git-send-email-jinsdb@126.com> (raw)
Before dma_resv_lock(bo->base.resv, NULL) in amdgpu_bo_release_notify(),
the bo->base.resv lock may be held by ttm_mem_evict_first(),
and the VRAM mem will be evicted, mem region was replaced
by Gtt mem region. amdgpu_bo_release_notify() will then
hold the bo->base.resv lock, and SDMA will get an invalid
address in amdgpu_fill_buffer(), resulting in a VMFAULT
or memory corruption.
To avoid it, we have to hold bo->base.resv lock first, and
check whether the mem.mem_type is TTM_PL_VRAM.
Signed-off-by: Qu Huang <jinsdb@126.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 4b29b82..8018574 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -1300,12 +1300,16 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
if (bo->base.resv == &bo->base._resv)
amdgpu_amdkfd_remove_fence_on_pt_pd_bos(abo);
- if (bo->mem.mem_type != TTM_PL_VRAM || !bo->mem.mm_node ||
- !(abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE))
+ if (!(abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE))
return;
dma_resv_lock(bo->base.resv, NULL);
+ if (bo->mem.mem_type != TTM_PL_VRAM || !bo->mem.mm_node) {
+ dma_resv_unlock(bo->base.resv);
+ return;
+ }
+
r = amdgpu_fill_buffer(abo, AMDGPU_POISON, bo->base.resv, &fence);
if (!WARN_ON(r)) {
amdgpu_bo_fence(abo, fence, false);
--
1.8.3.1
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next reply other threads:[~2021-04-02 3:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-02 3:18 Qu Huang [this message]
2021-04-02 16:25 ` [PATCH] drm/amdgpu: Fix a potential sdma invalid access Christian König
2021-04-03 3:08 ` Qu Huang
2021-04-03 5:08 ` Qu Huang
2021-04-03 8:49 ` Christian König
2021-04-06 6:04 ` Qu Huang
2021-04-06 13:44 ` Christian König
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