linux-stable.git/tools/testing/selftests/bpf/progs/verifier_map_ptr.c, branch linux-rolling-stable Linux kernel stable tree bpf: Return hashes of maps in BPF_OBJ_GET_INFO_BY_FD 2025-09-19T02:11:42+00:00 KP Singh kpsingh@kernel.org 2025-09-14T21:51:35+00:00 ea2e6467ac36bf3d785defc89e58269b15d182f7 Currently only array maps are supported, but the implementation can be extended for other maps and objects. The hash is memoized only for exclusive and frozen maps as their content is stable until the exclusive program modifies the map. This is required for BPF signing, enabling a trusted loader program to verify a map's integrity. The loader retrieves the map's runtime hash from the kernel and compares it against an expected hash computed at build time. Signed-off-by: KP Singh <kpsingh@kernel.org> Link: https://lore.kernel.org/r/20250914215141.15144-7-kpsingh@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
Currently only array maps are supported, but the implementation can be
extended for other maps and objects. The hash is memoized only for
exclusive and frozen maps as their content is stable until the exclusive
program modifies the map.

This is required for BPF signing, enabling a trusted loader program to
verify a map's integrity. The loader retrieves
the map's runtime hash from the kernel and compares it against an
expected hash computed at build time.

Signed-off-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/r/20250914215141.15144-7-kpsingh@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
selftests/bpf: verifier/map_ptr.c converted to inline assembly 2023-03-26T00:02:04+00:00 Eduard Zingerman eddyz87@gmail.com 2023-03-25T02:55:08+00:00 caf345cf12073eb5905b03c3c5f905cc0964dc6c Test verifier/map_ptr.c automatically converted to use inline assembly. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230325025524.144043-28-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
Test verifier/map_ptr.c automatically converted to use inline assembly.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-28-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>