From: <guangming.cao@mediatek.com>
To: "Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<dri-devel@lists.freedesktop.org>,
"moderated list:DMA BUFFER SHARING FRAMEWORK"
<linaro-mm-sig@lists.linaro.org>,
"open list" <linux-kernel@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>
Cc: <wsd_upstream@mediatek.com>, Guangming Cao <Guangming.Cao@mediatek.com>
Subject: [PATCH] dma-buf: acquire name lock before read/write dma_buf.name
Date: Fri, 8 Oct 2021 14:29:03 +0800 [thread overview]
Message-ID: <20211008062903.39731-1-guangming.cao@mediatek.com> (raw)
From: Guangming Cao <Guangming.Cao@mediatek.com>
Because dma-buf.name can be freed in func: "dma_buf_set_name",
so, we need to acquire lock first before we read/write dma_buf.name
to prevent Use After Free(UAF) issue.
Signed-off-by: Guangming Cao <Guangming.Cao@mediatek.com>
---
drivers/dma-buf/dma-buf.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 511fe0d217a0..aebb51b3ff52 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -80,7 +80,9 @@ static void dma_buf_release(struct dentry *dentry)
dma_resv_fini(dmabuf->resv);
module_put(dmabuf->owner);
+ spin_lock(&dmabuf->name_lock);
kfree(dmabuf->name);
+ spin_unlock(&dmabuf->name_lock);
kfree(dmabuf);
}
@@ -1372,6 +1374,8 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
if (ret)
goto error_unlock;
+
+ spin_lock(&dmabuf->name_lock);
seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
buf_obj->size,
buf_obj->file->f_flags, buf_obj->file->f_mode,
@@ -1379,6 +1383,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
buf_obj->exp_name,
file_inode(buf_obj->file)->i_ino,
buf_obj->name ?: "");
+ spin_unlock(&dmabuf->name_lock);
robj = buf_obj->resv;
fence = dma_resv_excl_fence(robj);
--
2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: <guangming.cao@mediatek.com>
To: "Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<dri-devel@lists.freedesktop.org>,
"moderated list:DMA BUFFER SHARING FRAMEWORK"
<linaro-mm-sig@lists.linaro.org>,
"open list" <linux-kernel@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>
Cc: <wsd_upstream@mediatek.com>, Guangming Cao <Guangming.Cao@mediatek.com>
Subject: [PATCH] dma-buf: acquire name lock before read/write dma_buf.name
Date: Fri, 8 Oct 2021 14:29:03 +0800 [thread overview]
Message-ID: <20211008062903.39731-1-guangming.cao@mediatek.com> (raw)
From: Guangming Cao <Guangming.Cao@mediatek.com>
Because dma-buf.name can be freed in func: "dma_buf_set_name",
so, we need to acquire lock first before we read/write dma_buf.name
to prevent Use After Free(UAF) issue.
Signed-off-by: Guangming Cao <Guangming.Cao@mediatek.com>
---
drivers/dma-buf/dma-buf.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 511fe0d217a0..aebb51b3ff52 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -80,7 +80,9 @@ static void dma_buf_release(struct dentry *dentry)
dma_resv_fini(dmabuf->resv);
module_put(dmabuf->owner);
+ spin_lock(&dmabuf->name_lock);
kfree(dmabuf->name);
+ spin_unlock(&dmabuf->name_lock);
kfree(dmabuf);
}
@@ -1372,6 +1374,8 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
if (ret)
goto error_unlock;
+
+ spin_lock(&dmabuf->name_lock);
seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
buf_obj->size,
buf_obj->file->f_flags, buf_obj->file->f_mode,
@@ -1379,6 +1383,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
buf_obj->exp_name,
file_inode(buf_obj->file)->i_ino,
buf_obj->name ?: "");
+ spin_unlock(&dmabuf->name_lock);
robj = buf_obj->resv;
fence = dma_resv_excl_fence(robj);
--
2.17.1
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
WARNING: multiple messages have this Message-ID (diff)
From: <guangming.cao@mediatek.com>
To: "Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<dri-devel@lists.freedesktop.org>,
"moderated list:DMA BUFFER SHARING FRAMEWORK"
<linaro-mm-sig@lists.linaro.org>,
"open list" <linux-kernel@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>
Cc: <wsd_upstream@mediatek.com>, Guangming Cao <Guangming.Cao@mediatek.com>
Subject: [PATCH] dma-buf: acquire name lock before read/write dma_buf.name
Date: Fri, 8 Oct 2021 14:29:03 +0800 [thread overview]
Message-ID: <20211008062903.39731-1-guangming.cao@mediatek.com> (raw)
From: Guangming Cao <Guangming.Cao@mediatek.com>
Because dma-buf.name can be freed in func: "dma_buf_set_name",
so, we need to acquire lock first before we read/write dma_buf.name
to prevent Use After Free(UAF) issue.
Signed-off-by: Guangming Cao <Guangming.Cao@mediatek.com>
---
drivers/dma-buf/dma-buf.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 511fe0d217a0..aebb51b3ff52 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -80,7 +80,9 @@ static void dma_buf_release(struct dentry *dentry)
dma_resv_fini(dmabuf->resv);
module_put(dmabuf->owner);
+ spin_lock(&dmabuf->name_lock);
kfree(dmabuf->name);
+ spin_unlock(&dmabuf->name_lock);
kfree(dmabuf);
}
@@ -1372,6 +1374,8 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
if (ret)
goto error_unlock;
+
+ spin_lock(&dmabuf->name_lock);
seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
buf_obj->size,
buf_obj->file->f_flags, buf_obj->file->f_mode,
@@ -1379,6 +1383,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
buf_obj->exp_name,
file_inode(buf_obj->file)->i_ino,
buf_obj->name ?: "");
+ spin_unlock(&dmabuf->name_lock);
robj = buf_obj->resv;
fence = dma_resv_excl_fence(robj);
--
2.17.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-10-08 6:27 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-08 6:29 guangming.cao [this message]
2021-10-08 6:29 ` [PATCH] dma-buf: acquire name lock before read/write dma_buf.name guangming.cao
2021-10-08 6:29 ` guangming.cao
2021-10-08 6:38 ` Christian König
2021-10-08 6:38 ` Christian König
2021-10-08 6:38 ` Christian König
2021-10-08 7:54 ` [PATCH v2] " guangming.cao
2021-10-08 7:54 ` guangming.cao
2021-10-08 7:54 ` guangming.cao
2021-10-08 10:24 ` Christian König
2021-10-08 10:24 ` Christian König
2021-10-08 10:24 ` Christian König
2021-10-12 9:07 ` guangming.cao
2021-10-12 9:07 ` guangming.cao
2021-10-12 9:07 ` guangming.cao
2021-10-29 2:15 ` guangming.cao
2021-10-29 2:15 ` guangming.cao
2021-10-29 2:15 ` guangming.cao
2021-10-29 7:34 ` Christian König
2021-10-29 7:34 ` Christian König
2021-10-29 7:34 ` Christian König
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