kernel.git/tools/bpf/bpftool/sign.c, branch master

bpftool: Allow bpftool to build with openssl < 3

2025-11-24T18:00:16Z

ERR_get_error_all()[1] is a openssl v3 API, so to make code compatible with openssl v1 utilize ERR_get_err_line_data instead. Since openssl is already a build requirement for the kernel (minimum requirement openssl 1.0.0), this will allow bpftool to compile where opensslv3 is not available. Signing-related BPF selftests pass with openssl v1. [1] https://docs.openssl.org/3.4/man3/ERR_get_error/ Fixes: 40863f4d6ef2 ("bpftool: Add support for signing BPF programs") Signed-off-by: Alan Maguire Acked-by: Song Liu Acked-by: Quentin Monnet Link: https://lore.kernel.org/r/20251120084754.640405-2-alan.maguire@oracle.com Signed-off-by: Alexei Starovoitov

bpftool: Remove duplicate string.h header

2025-09-27T11:23:15Z

./tools/bpf/bpftool/sign.c: string.h is included more than once. Reported-by: Abaci Robot Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=25502 Signed-off-by: Jiapeng Chong Acked-by: Quentin Monnet Link: https://lore.kernel.org/r/20250926095240.3397539-2-jiapeng.chong@linux.alibaba.com Signed-off-by: Alexei Starovoitov

bpftool: Add support for signing BPF programs

2025-09-23T02:17:55Z

Two modes of operation being added: Add two modes of operation: * For prog load, allow signing a program immediately before loading. This is essential for command-line testing and administration. bpftool prog load -S -k -i fentry_test.bpf.o * For gen skeleton, embed a pre-generated signature into the C skeleton file. This supports the use of signed programs in compiled applications. bpftool gen skeleton -S -k -i fentry_test.bpf.o Generation of the loader program and its metadata map is implemented in libbpf (bpf_obj__gen_loader). bpftool generates a skeleton that loads the program and automates the required steps: freezing the map, creating an exclusive map, loading, and running. Users can use standard libbpf APIs directly or integrate loader program generation into their own toolchains. Signed-off-by: KP Singh Acked-by: Quentin Monnet Link: https://lore.kernel.org/r/20250921160120.9711-5-kpsingh@kernel.org Signed-off-by: Alexei Starovoitov