[PATCH 6.6 209/254] uacce: implement mremap in uacce_vm_ops to return -EPERM

Greg Kroah-Hartman
2026-01-28T15:38:23Z

From: Yang Shen <shenyang39@huawei.com>

commit 02695347be532b628f22488300d40c4eba48b9b7 upstream.

The current uacce_vm_ops does not support the mremap operation of
vm_operations_struct. Implement .mremap to return -EPERM to remind
users.

The reason we need to explicitly disable mremap is that when the
driver does not implement .mremap, it uses the default mremap
method. This could lead to a risk scenario:

An application might first mmap address p1, then mremap to p2,
followed by munmap(p1), and finally munmap(p2). Since the default
mremap copies the original vma's vm_private_data (i.e., q) to the
new vma, both munmap operations would trigger vma_close, causing
q->qfr to be freed twice(qfr will be set to null here, so repeated
release is ok).

Fixes: 015d239ac014 ("uacce: add uacce driver")
Cc: stable@vger.kernel.org
Signed-off-by: Yang Shen <shenyang39@huawei.com>
Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Link: https://patch.msgid.link/20251202061256.4158641-4-huangchenghai2@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/misc/uacce/uacce.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/misc/uacce/uacce.c
+++ b/drivers/misc/uacce/uacce.c
@@ -211,8 +211,14 @@ static void uacce_vma_close(struct vm_ar
}
}

+static int uacce_vma_mremap(struct vm_area_struct *area)
+{
+ return -EPERM;
+}
+
static const struct vm_operations_struct uacce_vm_ops = {
.close = uacce_vma_close,
+ .mremap = uacce_vma_mremap,
};

static int uacce_fops_mmap(struct file *filep, struct vm_area_struct *vma)