Re: [PATCH v2] Implement close-on-fork
From: Matthew Wilcox <willy@infradead.org>
Date: 2020-05-15 16:26:37
Also in:
linux-alpha, linux-arch, linux-fsdevel, lkml, sparclinux
On Fri, May 15, 2020 at 04:07:33PM +0000, Karstens, Nate wrote:
Matthew, What alternative would you suggest?quoted
From an earlier email:quoted
...nothing else addresses the underlying issue: there is no way to prevent a fork() from duplicating the resource. The close-on-exec flag partially-addresses this by allowing the parent process to mark a file descriptor as exclusive to itself, but there is still a period of time the failure can occur because the auto-close only occurs during the exec(). Perhaps this would not be an issue with a different process/threading model, but that is another discussion entirely.Do you disagree there is an issue?
Yes. system() is defined as being unsafe for a threaded application to call. I pointed this out in the last thread.