Workaround for LXC 4.0.5 for Linux 5.10-rc1

lxc-workaround-linux-5.10.patch

From 77d66033cb0f497a217b7756f5e61de0f5e461ba Mon Sep 17 00:00:00 2001
From: Joan Bruguera <joanbrugueram@gmail.com>
Date: Fri, 30 Oct 2020 07:19:10 +0100
Subject: [PATCH] Workaround for LXC 4.0.5 for Linux 5.10-rc1

Fixes launching a container like: sudo -i lxc-start -n talpine -F

Resulting in the error message: lxc-start: talpine: conf.c: turn_into_dependent_mounts: 3012 Invalid argument - Failed to copy "/proc/self/mountinfo"

Breaking commit in Linux: 36e2c7421f02a22f71c9283e55fdb672a9eb58e7

Associated bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209971
---
 src/lxc/conf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lxc/conf.c b/src/lxc/conf.c
index 2a277d0..e13deaa 100644
--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -3004,7 +3004,7 @@ void turn_into_dependent_mounts(void)
 	}
 
 again:
-	copied = lxc_sendfile_nointr(memfd, mntinfo_fd, NULL, LXC_SENDFILE_MAX);
+	copied = fd_to_fd(mntinfo_fd, memfd);
 	if (copied < 0) {
 		if (errno == EINTR)
 			goto again;
-- 
2.29.1