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[0/1,v3] security: Propagate caller information in bpf hooks

Message ID 20250303222416.3909228-1-bboscaccy@linux.microsoft.com (mailing list archive)
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Series security: Propagate caller information in bpf hooks | expand

Message

Blaise Boscaccy March 3, 2025, 10:24 p.m. UTC 
Hello,

While trying to implement an eBPF gatekeeper program, we ran into an
issue whereas the LSM hooks are missing some relevant data.

Certain subcommands passed to the bpf() syscall can be invoked from
either the kernel or userspace. Additionally, some fields in the
bpf_attr sruct contain pointers, and depending on where the subcommand
was invoked, could point to either user or kernel memory. One example
of this, is the bpf_prog_load subcommand and it's fd_array.  This data
is made available and used by the verifier, but not made available to
the LSM subsystem. This patchset simply exposes that information to
applicable LSM hooks.


Change list:
- v2 -> v3
  - reorder params so that the new boolean flag is the last param
  - fixup function signatures in bpf selftests
- v1 -> v2
  - Pass a boolean flag in lieu of bpfptr_t

Revisions:
- v2
  https://lore.kernel.org/bpf/20250228165322.3121535-1-bboscaccy@linux.microsoft.com/
- v1
  https://lore.kernel.org/bpf/20250226003055.1654837-1-bboscaccy@linux.microsoft.com/


Blaise Boscaccy (1):
  security: Propagate caller information in bpf hooks

 include/linux/lsm_hook_defs.h                     |  6 +++---
 include/linux/security.h                          | 12 ++++++------
 kernel/bpf/syscall.c                              | 10 +++++-----
 security/security.c                               | 15 +++++++++------
 security/selinux/hooks.c                          |  6 +++---
 tools/testing/selftests/bpf/progs/rcu_read_lock.c |  3 ++-
 .../selftests/bpf/progs/test_cgroup1_hierarchy.c  |  4 ++--
 .../selftests/bpf/progs/test_kfunc_dynptr_param.c |  6 +++---
 .../testing/selftests/bpf/progs/test_lookup_key.c |  2 +-
 .../selftests/bpf/progs/test_ptr_untrusted.c      |  2 +-
 .../selftests/bpf/progs/test_task_under_cgroup.c  |  2 +-
 .../selftests/bpf/progs/test_verify_pkcs7_sig.c   |  2 +-
 12 files changed, 37 insertions(+), 33 deletions(-)