diff options
| author |  Mimi Zohar <zohar@linux.vnet.ibm.com>
| 2016-12-19 16:22:35 -0800 |
|---|---|---|
| committer |  Linus Torvalds <torvalds@linux-foundation.org>
| 2016-12-20 09:48:43 -0800 |
| commit | 94c3aac567a9ddb9e868a7fae3c927c08b51b7c6 (patch) | |
| tree | d8f23729fb52de514f097fd8b7c167b3da4f4788 /security/integrity/ima/ima_kexec.c | |
| parent | powerpc: ima: get the kexec buffer passed by the previous kernel (diff) | |
| download | linux-94c3aac567a9ddb9e868a7fae3c927c08b51b7c6.tar.gz linux-94c3aac567a9ddb9e868a7fae3c927c08b51b7c6.tar.bz2 linux-94c3aac567a9ddb9e868a7fae3c927c08b51b7c6.zip | |
ima: on soft reboot, restore the measurement list
The TPM PCRs are only reset on a hard reboot. In order to validate a
TPM's quote after a soft reboot (eg. kexec -e), the IMA measurement
list of the running kernel must be saved and restored on boot. This
patch restores the measurement list.
Link: http://lkml.kernel.org/r/1480554346-29071-3-git-send-email-zohar@linux.vnet.ibm.com
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andreas Steffen <andreas.steffen@strongswan.org>
Cc: Josh Sklar <sklar@linux.vnet.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/integrity/ima/ima_kexec.c')
| -rw-r--r-- | security/integrity/ima/ima_kexec.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c new file mode 100644 index 000000000000..36afd0fe9747 --- /dev/null +++ b/security/integrity/ima/ima_kexec.c @@ -0,0 +1,44 @@ +/* + * Copyright (C) 2016 IBM Corporation + * + * Authors: + * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> + * Mimi Zohar <zohar@linux.vnet.ibm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include "ima.h" + +/* + * Restore the measurement list from the previous kernel. + */ +void ima_load_kexec_buffer(void) +{ + void *kexec_buffer = NULL; + size_t kexec_buffer_size = 0; + int rc; + + rc = ima_get_kexec_buffer(&kexec_buffer, &kexec_buffer_size); + switch (rc) { + case 0: + rc = ima_restore_measurement_list(kexec_buffer_size, + kexec_buffer); + if (rc != 0) + pr_err("Failed to restore the measurement list: %d\n", + rc); + + ima_free_kexec_buffer(); + break; + case -ENOTSUPP: + pr_debug("Restoring the measurement list not supported\n"); + break; + case -ENOENT: + pr_debug("No measurement list to restore\n"); + break; + default: + pr_debug("Error restoring the measurement list: %d\n", rc); + } +} |