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Date: Sat, 23 Mar 2013 21:45:26 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: Re: proposed popen replacement using posix_spawn
On Sat, Mar 23, 2013 at 09:40:57PM -0400, Rich Felker wrote:
> /* Remove close-on-exec flag if dup2 will be a no-op in the child */
> if (p[1-op] == 1-op) fcntl(1-op, F_SETFD, 0);
This part is wrong; it creates a file descriptor leak race condition
in the parent. The only solution I can see is that the parent must
ensure p[1-op]!=1-op before calling posix_spawn. The easiest way to do
that is to move p[1-op] to a new fd number using F_DUPFD_CLOEXEC when
this happens, and fail the entire operation if this fails. I'll update
the code accordingly.
Rich
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