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[86.26.115.213]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3912c01cd62sm18815549f8f.46.2025.03.11.14.54.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Mar 2025 14:54:23 -0700 (PDT) From: Mykyta Yatsenko To: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, kafai@meta.com, kernel-team@meta.com, eddyz87@gmail.com, olsajiri@gmail.com, yonghong.song@linux.dev Cc: Mykyta Yatsenko Subject: [PATCH bpf-next v5 0/4] Support freplace prog from user namespace Date: Tue, 11 Mar 2025 21:54:16 +0000 Message-ID: <20250311215420.456512-1-mykyta.yatsenko5@gmail.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Mykyta Yatsenko Freplace programs can't be loaded from user namespace, as bpf_program__set_attach_target() requires searching for target prog BTF, which is locked under CAP_SYS_ADMIN. This patch set enables this use case by: 1. Relaxing capable check in bpf's BPF_BTF_GET_FD_BY_ID, check for CAP_BPF instead of CAP_SYS_ADMIN, support BPF token in attr argument. 2. Pass BPF token around libbpf from bpf_program__set_attach_target() to bpf syscall where capable check is. 3. Validate positive/negative scenarios in selftests This patch set is enabled by the recent libbpf change[1], that introduced bpf_object__prepare() API. Calling bpf_object__prepare() for freplace program before bpf_program__set_attach_target() initializes BPF token, which is then passed to bpf syscall by libbpf. [1] https://lore.kernel.org/all/20250303135752.158343-1-mykyta.yatsenko5@gmail.com/ Mykyta Yatsenko (4): bpf: BPF token support for BPF_BTF_GET_FD_BY_ID bpf: return prog btf_id without capable check libbpf: pass BPF token from find_prog_btf_id to BPF_BTF_GET_FD_BY_ID selftests/bpf: test freplace from user namespace include/uapi/linux/bpf.h | 1 + kernel/bpf/syscall.c | 24 ++++- tools/include/uapi/linux/bpf.h | 1 + tools/lib/bpf/bpf.c | 3 +- tools/lib/bpf/bpf.h | 3 +- tools/lib/bpf/btf.c | 15 ++- tools/lib/bpf/libbpf.c | 10 +- tools/lib/bpf/libbpf_internal.h | 1 + .../bpf/prog_tests/libbpf_get_fd_by_id_opts.c | 3 +- .../testing/selftests/bpf/prog_tests/token.c | 97 ++++++++++++++++++- .../selftests/bpf/progs/priv_freplace_prog.c | 13 +++ tools/testing/selftests/bpf/progs/priv_prog.c | 6 +- 12 files changed, 158 insertions(+), 19 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/priv_freplace_prog.c -- 2.48.1