linux-kernel - [RFC PATCH bpf-next 01/13] fork: New clone3 flag for BPF namespace

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Date:   Sun, 26 Mar 2023 09:21:56 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>
Subject: [RFC PATCH bpf-next 01/13] fork: New clone3 flag for BPF namespace

A new clone3 flag CLONE_NEWBPF is introduced to create a new BPF
namespace.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
---
 include/uapi/linux/sched.h | 1 +
 kernel/fork.c              | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h
index 3bac0a8..ace31df 100644
--- a/include/uapi/linux/sched.h
+++ b/include/uapi/linux/sched.h
@@ -36,6 +36,7 @@
 /* Flags for the clone3() syscall. */
 #define CLONE_CLEAR_SIGHAND 0x100000000ULL /* Clear any signal handler and reset to SIG_DFL. */
 #define CLONE_INTO_CGROUP 0x200000000ULL /* Clone into a specific cgroup given the right permissions. */
+#define CLONE_NEWBPF		0x400000000ULL /* New BPF namespace */
 
 /*
  * cloning flags intersect with CSIGNAL so can be used with unshare and clone3
diff --git a/kernel/fork.c b/kernel/fork.c
index f68954d..db0abd4 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2929,7 +2929,8 @@ static bool clone3_args_valid(struct kernel_clone_args *kargs)
 {
 	/* Verify that no unknown flags are passed along. */
 	if (kargs->flags &
-	    ~(CLONE_LEGACY_FLAGS | CLONE_CLEAR_SIGHAND | CLONE_INTO_CGROUP))
+	    ~(CLONE_LEGACY_FLAGS | CLONE_CLEAR_SIGHAND | CLONE_INTO_CGROUP |
+		  CLONE_NEWBPF))
 		return false;
 
 	/*
@@ -3080,7 +3081,7 @@ static int check_unshare_flags(unsigned long unshare_flags)
 				CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
 				CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET|
 				CLONE_NEWUSER|CLONE_NEWPID|CLONE_NEWCGROUP|
-				CLONE_NEWTIME))
+				CLONE_NEWTIME|CLONE_NEWBPF))
 		return -EINVAL;
 	/*
 	 * Not implemented, but pretend it works if there is nothing
-- 
1.8.3.1