[PATCH bpf-next] bpf: Make bpf_get_current_[ancestor_]cgroup_id() available for all program types

[PATCH bpf-next] bpf: Make bpf_get_current_[ancestor_]cgroup_id() available for all program types

[Tejun Heo]

These helpers are safe to call from any context and there's no reason to
restrict access to them. Remove them from bpf_trace and filter lists and add
to bpf_base_func_proto() under perfmon_capable().

Please note that while test_verifier results remain the same, I'm unsure
whether subjecting their availability to perfmon_capable() is the right
decision.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
 kernel/bpf/cgroup.c      | 4 ----
 kernel/bpf/helpers.c     | 6 ++++++
 kernel/trace/bpf_trace.c | 4 ----
 net/core/filter.c        | 6 ------
 4 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index bf2fdb33fb31..a4ae422b8f12 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -2529,10 +2529,6 @@ cgroup_current_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_current_pid_tgid_proto;
 	case BPF_FUNC_get_current_comm:
 		return &bpf_get_current_comm_proto;
-	case BPF_FUNC_get_current_cgroup_id:
-		return &bpf_get_current_cgroup_id_proto;
-	case BPF_FUNC_get_current_ancestor_cgroup_id:
-		return &bpf_get_current_ancestor_cgroup_id_proto;
 #ifdef CONFIG_CGROUP_NET_CLASSID
 	case BPF_FUNC_get_cgroup_classid:
 		return &bpf_get_cgroup_classid_curr_proto;
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 49a2ab8eb0bb..6f8545738a19 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1726,6 +1726,12 @@ bpf_base_func_proto(enum bpf_func_id func_id)
 		return &bpf_task_pt_regs_proto;
 	case BPF_FUNC_trace_vprintk:
 		return bpf_get_trace_vprintk_proto();
+#ifdef CONFIG_CGROUPS
+	case BPF_FUNC_get_current_cgroup_id:
+		return &bpf_get_current_cgroup_id_proto;
+	case BPF_FUNC_get_current_ancestor_cgroup_id:
+		return &bpf_get_current_ancestor_cgroup_id_proto;
+#endif
 	default:
 		return NULL;
 	}
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index c58baf9983cc..489942354a90 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1455,10 +1455,6 @@ bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		       NULL : &bpf_probe_read_compat_str_proto;
 #endif
 #ifdef CONFIG_CGROUPS
-	case BPF_FUNC_get_current_cgroup_id:
-		return &bpf_get_current_cgroup_id_proto;
-	case BPF_FUNC_get_current_ancestor_cgroup_id:
-		return &bpf_get_current_ancestor_cgroup_id_proto;
 	case BPF_FUNC_cgrp_storage_get:
 		return &bpf_cgrp_storage_get_proto;
 	case BPF_FUNC_cgrp_storage_delete:
diff --git a/net/core/filter.c b/net/core/filter.c
index 1d6f165923bf..0f2589ea70f3 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -8144,12 +8144,6 @@ sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_sk_storage_delete_proto;
 	case BPF_FUNC_get_netns_cookie:
 		return &bpf_get_netns_cookie_sk_msg_proto;
-#ifdef CONFIG_CGROUPS
-	case BPF_FUNC_get_current_cgroup_id:
-		return &bpf_get_current_cgroup_id_proto;
-	case BPF_FUNC_get_current_ancestor_cgroup_id:
-		return &bpf_get_current_ancestor_cgroup_id_proto;
-#endif
 #ifdef CONFIG_CGROUP_NET_CLASSID
 	case BPF_FUNC_get_cgroup_classid:
 		return &bpf_get_cgroup_classid_curr_proto;
-- 
2.39.2

[PATCH v2 bpf-next] bpf: Make bpf_get_current_[ancestor_]cgroup_id() available for all program types

[Tejun Heo]

These helpers are safe to call from any context and there's no reason to
restrict access to them. Remove them from bpf_trace and filter lists and add
to bpf_base_func_proto() under perfmon_capable().

v2: After consulting with Andrii, relocated in bpf_base_func_proto() so that
    they require bpf_capable() but not perfomon_capable() as it doesn't read
    from or affect others on the system.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
---
 kernel/bpf/cgroup.c      | 4 ----
 kernel/bpf/helpers.c     | 4 ++++
 kernel/trace/bpf_trace.c | 4 ----
 net/core/filter.c        | 6 ------
 4 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index bf2fdb33fb31..a4ae422b8f12 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -2529,10 +2529,6 @@ cgroup_current_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_current_pid_tgid_proto;
 	case BPF_FUNC_get_current_comm:
 		return &bpf_get_current_comm_proto;
-	case BPF_FUNC_get_current_cgroup_id:
-		return &bpf_get_current_cgroup_id_proto;
-	case BPF_FUNC_get_current_ancestor_cgroup_id:
-		return &bpf_get_current_ancestor_cgroup_id_proto;
 #ifdef CONFIG_CGROUP_NET_CLASSID
 	case BPF_FUNC_get_cgroup_classid:
 		return &bpf_get_cgroup_classid_curr_proto;
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 49a2ab8eb0bb..d4e910fbbda9 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1693,6 +1693,10 @@ bpf_base_func_proto(enum bpf_func_id func_id)
 		return &bpf_cgrp_storage_get_proto;
 	case BPF_FUNC_cgrp_storage_delete:
 		return &bpf_cgrp_storage_delete_proto;
+	case BPF_FUNC_get_current_cgroup_id:
+		return &bpf_get_current_cgroup_id_proto;
+	case BPF_FUNC_get_current_ancestor_cgroup_id:
+		return &bpf_get_current_ancestor_cgroup_id_proto;
 #endif
 	default:
 		break;
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index c58baf9983cc..489942354a90 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1455,10 +1455,6 @@ bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		       NULL : &bpf_probe_read_compat_str_proto;
 #endif
 #ifdef CONFIG_CGROUPS
-	case BPF_FUNC_get_current_cgroup_id:
-		return &bpf_get_current_cgroup_id_proto;
-	case BPF_FUNC_get_current_ancestor_cgroup_id:
-		return &bpf_get_current_ancestor_cgroup_id_proto;
 	case BPF_FUNC_cgrp_storage_get:
 		return &bpf_cgrp_storage_get_proto;
 	case BPF_FUNC_cgrp_storage_delete:
diff --git a/net/core/filter.c b/net/core/filter.c
index 1d6f165923bf..0f2589ea70f3 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -8144,12 +8144,6 @@ sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_sk_storage_delete_proto;
 	case BPF_FUNC_get_netns_cookie:
 		return &bpf_get_netns_cookie_sk_msg_proto;
-#ifdef CONFIG_CGROUPS
-	case BPF_FUNC_get_current_cgroup_id:
-		return &bpf_get_current_cgroup_id_proto;
-	case BPF_FUNC_get_current_ancestor_cgroup_id:
-		return &bpf_get_current_ancestor_cgroup_id_proto;
-#endif
 #ifdef CONFIG_CGROUP_NET_CLASSID
 	case BPF_FUNC_get_cgroup_classid:
 		return &bpf_get_cgroup_classid_curr_proto;
-- 
2.39.2

Re: [PATCH v2 bpf-next] bpf: Make bpf_get_current_[ancestor_]cgroup_id() available for all program types

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Thu, 2 Mar 2023 09:42:59 -1000 you wrote:
> These helpers are safe to call from any context and there's no reason to
> restrict access to them. Remove them from bpf_trace and filter lists and add
> to bpf_base_func_proto() under perfmon_capable().
> 
> v2: After consulting with Andrii, relocated in bpf_base_func_proto() so that
>     they require bpf_capable() but not perfomon_capable() as it doesn't read
>     from or affect others on the system.
> 
> [...]

Here is the summary with links:
  - [v2,bpf-next] bpf: Make bpf_get_current_[ancestor_]cgroup_id() available for all program types
    https://git.kernel.org/bpf/bpf-next/c/c501bf55c88b

You are awesome, thank you!
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