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| author |   Matthew Garrett <matthewgarrett@google.com> | 2019-08-19 17:18:01 -0700 |
|---|---|---|
| committer |   James Morris <jmorris@namei.org> | 2019-08-19 21:54:16 -0700 |
| commit | 29d3c1c8dfe752c01b7115ecd5a3142b232a38e1 (patch) | |
| tree | 9a42db9e64c08db645dcf9689344d4f718b4d518 /security/integrity/ima/ima_main.c | |
| parent | lockdown: Lock down perf when in confidentiality mode (diff) | |
| download | linux-dev-29d3c1c8dfe752c01b7115ecd5a3142b232a38e1.tar.xz linux-dev-29d3c1c8dfe752c01b7115ecd5a3142b232a38e1.zip | |
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 'security/integrity/ima/ima_main.c')
| -rw-r--r-- | security/integrity/ima/ima_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 1cffda4412b7..1747bc7bcb60 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -469,7 +469,7 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) return 0; } -static const int read_idmap[READING_MAX_ID] = { +const int read_idmap[READING_MAX_ID] = { [READING_FIRMWARE] = FIRMWARE_CHECK, [READING_FIRMWARE_PREALLOC_BUFFER] = FIRMWARE_CHECK, [READING_MODULE] = MODULE_CHECK, |