Vulnerability Information
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Vulnerability Title
tcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case syzbot found that mixing sendpage() and sendmsg(MSG_ZEROCOPY) calls over the same TCP socket would again trigger the infamous warning in inet_sock_destruct() WARN_ON(sk_forward_alloc_get(sk)); While Talal took into account a mix of regular copied data and MSG_ZEROCOPY one in the same skb, the sendpage() path has been forgotten. We want the charging to happen for sendpage(), because pages could be coming from a pipe. What is missing is the downgrading of pure zerocopy status to make sure sk_forward_alloc will stay synced. Add tcp_downgrade_zcopy_pure() helper so that we can use it from the two callers.
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tcp模块中发现混合splice函数/sendmsg(MSG_ZEROCOPY)问题。在处理sendpage函数和sendmsg(MSG_ZEROCOPY)混合调用时，可能会导致inet_sock_destruct函数中的警告。
CVSS Information
N/A
Vulnerability Type
N/A