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From 1f714c474eb248b3fa2c84f3b0f22cc509c0e6c9 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Wed, 1 Dec 2021 14:58:40 +0000
Subject: [PATCH] clone-internal.c: make clone3 syscall optional
We're disabling clone3 for now _CONDITIONALLY_ (not by default) to allow
compatibility with applications using older Electron.
Use -DGENTOO_USE_CLONE3 to enable clone3 for now. In future, we will
revert back to always using clone3.
This was impacting e.g. Discord and Skype. This patch stops glibc from using
clone3 internally (which is the only real use of it) and falls back to the old
behaviour.
Specifically, we want https://github.com/electron/electron/pull/31091
to work its way downstream to various Electron applications.
https://bugs.gentoo.org/819045
https://bugs.gentoo.org/827386
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/glibc/plain/debian/patches/ubuntu/disable-clone3.patch
This is the same as the patch that was considered but ultimately rejected
for 2.34 because Docker got sorted out in time:
https://patchwork.ozlabs.org/project/glibc/patch/87eebkf8ph.fsf@oldenburg.str.redhat.com/.
Signed-off-by: Sam James <sam@gentoo.org>
---
sysdeps/unix/sysv/linux/clone-internal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sysdeps/unix/sysv/linux/clone-internal.c b/sysdeps/unix/sysv/linux/clone-internal.c
index 979f7880be..c5566daf73 100644
--- a/sysdeps/unix/sysv/linux/clone-internal.c
+++ b/sysdeps/unix/sysv/linux/clone-internal.c
@@ -48,7 +48,7 @@ __clone_internal (struct clone_args *cl_args,
int (*func) (void *arg), void *arg)
{
int ret;
-#ifdef HAVE_CLONE3_WRAPPER
+#if defined(HAVE_CLONE3_WRAPPER) && defined(GENTOO_USE_CLONE3)
/* Try clone3 first. */
int saved_errno = errno;
ret = __clone3 (cl_args, sizeof (*cl_args), func, arg);
--
2.32.0
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