diff options
author | Matthew Garrett <matthewgarrett@google.com> | 2019-08-19 17:18:01 -0700 |
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committer | James Morris <jmorris@namei.org> | 2019-08-19 21:54:16 -0700 |
commit | 29d3c1c8dfe752c01b7115ecd5a3142b232a38e1 (patch) | |
tree | 9a42db9e64c08db645dcf9689344d4f718b4d518 /fs/debugfs/file.c | |
parent | b0c8fdc7fdb77586c3d1937050925b960743306e (diff) |
kexec: Allow kexec_file() with appropriate IMA policy when locked down
Systems in lockdown mode should block the kexec of untrusted kernels.
For x86 and ARM we can ensure that a kernel is trustworthy by validating
a PE signature, but this isn't possible on other architectures. On those
platforms we can use IMA digital signatures instead. Add a function to
determine whether IMA has or will verify signatures for a given event type,
and if so permit kexec_file() even if the kernel is otherwise locked down.
This is restricted to cases where CONFIG_INTEGRITY_TRUSTED_KEYRING is set
in order to prevent an attacker from loading additional keys at runtime.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: linux-integrity@vger.kernel.org
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'fs/debugfs/file.c')
0 files changed, 0 insertions, 0 deletions