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devtmpfs: create private mount namespace

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Kernel threads start in a completely isolated nullfs mount. Use
UNSHARE_EMPTY_MNTNS to give the devtmpfsd kthread a private empty mount
namespace with its root and pwd already set up, so it can mount its own
devtmpfs instance instead of unsharing a copy of the initial mount
namespace.

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-21-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-06-01 15:56:54 +02:00
parent ed4b167252
commit 66d2faeccb
1 changed files with 1 additions and 1 deletions
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drivers/base/devtmpfs.c
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@@ -413,7 +413,7 @@ static noinline int __init devtmpfs_setup(void *p)
{
int err;
err = ksys_unshare(CLONE_NEWNS);
err = ksys_unshare(UNSHARE_EMPTY_MNTNS);
if (err)
goto out;
err = init_mount("devtmpfs", "/", "devtmpfs", DEVTMPFS_MFLAGS, NULL);