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From d79fe162c009788888faaf0317253b6f0cac7092 Mon Sep 17 00:00:00 2001
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From: Kevin Buettner <kevinb@redhat.com>
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Date: Thu, 23 Apr 2020 17:05:34 -0400
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Subject: [SV 58232] Disable inheritance of jobserver FDs for recursive make
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A parent make will invoke a sub-make with close-on-exec disabled for
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the jobserver pipe FDs. Force close-on-exec to be to be enabled in
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the sub-make so the pipe is not always passed to child jobs.
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I have a test case which, when invoked with a suitable -j switch,
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will hang if the recipe inherits the jobserver pipe. This test case
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was inspired by a real world case in which testing GDB on Fedora
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would hang due to some poorly written test GDB cases having been
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passed the jobserver file descriptors.
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* src/posixos.c (jobserver_parse_auth): Call fd_noinherit() for
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jobserver pipe descriptors.
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Copyright-paperwork-exempt: yes
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diff --git a/src/posixos.c b/src/posixos.c
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index 525f292c..eab175a4 100644
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--- a/src/posixos.c
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+++ b/src/posixos.c
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@@ -145,6 +145,11 @@ jobserver_parse_auth (const char *auth)
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/* When using pselect() we want the read to be non-blocking. */
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set_blocking (job_fds[0], 0);
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+ /* By default we don't send the job pipe FDs to our children.
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+ See jobserver_pre_child() and jobserver_post_child(). */
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+ fd_noinherit (job_fds[0]);
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+ fd_noinherit (job_fds[1]);
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+
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return 1;
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}
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