From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>
Cc: <linux-security-module@vger.kernel.org>, <keescook@chromium.org>,
<brauner@kernel.org>, <lennart@poettering.net>,
<cyphar@cyphar.com>, <luto@kernel.org>, <kernel-team@meta.com>,
<sargun@sargun.me>
Subject: [PATCH RESEND v3 bpf-next 08/14] libbpf: add BPF token support to bpf_btf_load() API
Date: Wed, 28 Jun 2023 22:18:26 -0700 [thread overview]
Message-ID: <20230629051832.897119-9-andrii@kernel.org> (raw)
In-Reply-To: <20230629051832.897119-1-andrii@kernel.org>
Allow user to specify token_fd for bpf_btf_load() API that wraps
kernel's BPF_BTF_LOAD command. This allows loading BTF from unprivileged
process as long as it has BPF token allowing BPF_BTF_LOAD command, which
can be created and delegated by privileged process.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
tools/lib/bpf/bpf.c | 4 +++-
tools/lib/bpf/bpf.h | 3 ++-
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 882297b1e136..6fb915069be7 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -1098,7 +1098,7 @@ int bpf_raw_tracepoint_open(const char *name, int prog_fd)
int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts *opts)
{
- const size_t attr_sz = offsetofend(union bpf_attr, btf_log_true_size);
+ const size_t attr_sz = offsetofend(union bpf_attr, btf_token_fd);
union bpf_attr attr;
char *log_buf;
size_t log_size;
@@ -1123,6 +1123,8 @@ int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts
attr.btf = ptr_to_u64(btf_data);
attr.btf_size = btf_size;
+ attr.btf_token_fd = OPTS_GET(opts, token_fd, 0);
+
/* log_level == 0 and log_buf != NULL means "try loading without
* log_buf, but retry with log_buf and log_level=1 on error", which is
* consistent across low-level and high-level BTF and program loading
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index cd3fb5ce6fe2..dc7c4af21ad9 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -132,9 +132,10 @@ struct bpf_btf_load_opts {
* If kernel doesn't support this feature, log_size is left unchanged.
*/
__u32 log_true_size;
+ __u32 token_fd;
size_t :0;
};
-#define bpf_btf_load_opts__last_field log_true_size
+#define bpf_btf_load_opts__last_field token_fd
LIBBPF_API int bpf_btf_load(const void *btf_data, size_t btf_size,
struct bpf_btf_load_opts *opts);
--
2.34.1
next prev parent reply other threads:[~2023-06-29 5:21 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-29 5:18 [PATCH RESEND v3 bpf-next 00/14] BPF token Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 01/14] bpf: introduce BPF token object Andrii Nakryiko
2023-07-04 12:43 ` Christian Brauner
2023-07-04 13:34 ` Christian Brauner
2023-07-04 23:28 ` Toke Høiland-Jørgensen
2023-07-05 7:20 ` Daniel Borkmann
2023-07-05 8:45 ` Christian Brauner
2023-07-05 12:34 ` Toke Høiland-Jørgensen
2023-07-05 14:16 ` Paul Moore
2023-07-05 14:42 ` Christian Brauner
2023-07-05 16:00 ` Paul Moore
2023-07-05 21:38 ` Andrii Nakryiko
2023-07-06 11:32 ` Toke Høiland-Jørgensen
2023-07-06 20:37 ` Andrii Nakryiko
2023-07-07 13:04 ` Toke Høiland-Jørgensen
2023-07-07 17:58 ` Andrii Nakryiko
2023-07-07 22:00 ` Toke Høiland-Jørgensen
2023-07-07 23:58 ` Andrii Nakryiko
2023-07-10 23:42 ` Djalal Harouni
2023-07-11 13:33 ` Christian Brauner
2023-07-11 22:06 ` Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 02/14] libbpf: add bpf_token_create() API Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 03/14] selftests/bpf: add BPF_TOKEN_CREATE test Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 04/14] bpf: add BPF token support to BPF_MAP_CREATE command Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 05/14] libbpf: add BPF token support to bpf_map_create() API Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 06/14] selftests/bpf: add BPF token-enabled test for BPF_MAP_CREATE command Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 07/14] bpf: add BPF token support to BPF_BTF_LOAD command Andrii Nakryiko
2023-06-29 5:18 ` Andrii Nakryiko [this message]
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 09/14] selftests/bpf: add BPF token-enabled BPF_BTF_LOAD selftest Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 10/14] bpf: add BPF token support to BPF_PROG_LOAD command Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 11/14] bpf: take into account BPF token when fetching helper protos Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 12/14] bpf: consistenly use BPF token throughout BPF verifier logic Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 13/14] libbpf: add BPF token support to bpf_prog_load() API Andrii Nakryiko
2023-06-29 5:18 ` [PATCH RESEND v3 bpf-next 14/14] selftests/bpf: add BPF token-enabled BPF_PROG_LOAD tests Andrii Nakryiko
2023-06-29 23:15 ` [PATCH RESEND v3 bpf-next 00/14] BPF token Toke Høiland-Jørgensen
2023-06-30 18:25 ` Andrii Nakryiko
2023-07-04 9:38 ` Christian Brauner
2023-07-04 23:20 ` Toke Høiland-Jørgensen
2023-07-05 12:57 ` Stefano Brivio
2023-07-02 6:59 ` Djalal Harouni
2023-07-04 9:51 ` Christian Brauner
2023-07-04 23:33 ` Toke Høiland-Jørgensen
2023-07-05 20:39 ` Andrii Nakryiko
2023-07-01 2:05 ` Yafang Shao
2023-07-05 20:37 ` Andrii Nakryiko
2023-07-06 1:26 ` Yafang Shao
2023-07-06 20:34 ` Andrii Nakryiko
2023-07-07 1:42 ` Yafang Shao
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