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Age	Commit message (Collapse)	Author
2026-08-03	selftests/exec: check that a binfmt_misc instance cannot be pinned	Christian Brauner
	An 'F' entry whose interpreter keeps the binfmt_misc superblock alive pins the instance that owns it forever. Cover both ways to build that: - an interpreter on the instance's own files, control file and entry file alike - and an instance used as an overlayfs lower layer. Check that an ordinary 'F' registration still succeeds so the fix stays honest about not changing what 'F' promises. Link: https://patch.msgid.link/20260728-work-binfmt_misc-selfpin-v1-2-74df5daeca5b@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
2026-08-03	selftests/exec: convert the binfmt_misc bpf test to the kselftest harness	Christian Brauner
	The test reports its own pass and fail lines, returns a bare 4 for KSFT_SKIP and runs both cases in one process, so a failure in the first takes the second with it. It also open-codes the register, unregister, file-copy and mount helpers that the tests for the upcoming transparent and loader dispatch modes need again. Convert it to the kselftest harness: a fixture for the common setup and teardown, one TEST_F per case so each is reported and isolated separately, and SKIP() for the root, BTF and binfmt_misc preconditions. Move the helpers to a shared header on the way, with the register helper preserving the write's errno so a caller can tell a rejected flag combination (EINVAL) from a kernel that does not know the flag at all. The synthetic ELF header gains an e_machine argument and uses the elf.h constants instead of open-coded numbers. The fixture no longer mounts bpffs. The handler is attached with bpf_map__attach_struct_ops() and nothing is ever pinned, the mount was carried along from a bpftool-based draft. The bpf objects are compiled with -DBPF_NO_KFUNC_PROTOTYPES - the guard bpftool emits for exactly this - instead of sed'ing the prototypes out of the generated vmlinux.h. And the config fragment records the options the binfmt_misc tests need so a merge-config kernel can run them. No change in what is tested. Link: https://patch.msgid.link/20260721-work-bpf-binfmt_misc-ptinterp-v2-7-e57866e4ae0f@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
2024-12-18	selftests/exec: Add 32 tests for AT_EXECVE_CHECK and exec securebits	Mickaël Salaün
	Test that checks performed by execveat(..., AT_EXECVE_CHECK) are consistent with noexec mount points and file execute permissions. Test that SECBIT_EXEC_RESTRICT_FILE and SECBIT_EXEC_DENY_INTERACTIVE are inherited by child processes and that they can be pinned with the appropriate SECBIT_EXEC_RESTRICT_FILE_LOCKED and SECBIT_EXEC_DENY_INTERACTIVE_LOCKED bits. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Paul Moore <paul@paul-moore.com> Cc: Serge Hallyn <serge@hallyn.com> Signed-off-by: Mickaël Salaün <mic@digikod.net> Link: https://lore.kernel.org/r/20241212174223.389435-4-mic@digikod.net Signed-off-by: Kees Cook <kees@kernel.org>