Vulnerability Information
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Vulnerability Title
block: Fix WARNING in _copy_from_iter
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: block: Fix WARNING in _copy_from_iter Syzkaller reports a warning in _copy_from_iter because an iov_iter is supposedly used in the wrong direction. The reason is that syzcaller managed to generate a request with a transfer direction of SG_DXFER_TO_FROM_DEV. This instructs the kernel to copy user buffers into the kernel, read into the copied buffers and then copy the data back to user space. Thus the iovec is used in both directions. Detect this situation in the block layer and construct a new iterator with the correct direction for the copy-in.
CVSS Information
N/A
Vulnerability Type
N/A
Vulnerability Title
Linux kernel 安全漏洞
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于syzcaller 设法生成传输方向为 SG_DXFER_TO_FROM_DEV 的请求，意思是会将用户缓冲区复制到内核中，读入复制的缓冲区，然后将数据复制回用户空间。
CVSS Information
N/A
Vulnerability Type
N/A