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ima: define a canonical binary_runtime_measurements list format

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The IMA binary_runtime_measurements list is currently in platform native
format.

To allow restoring a measurement list carried across kexec with a
different endianness than the targeted kernel, this patch defines
little-endian as the canonical format.  For big endian systems wanting
to save/restore the measurement list from a system with a different
endianness, a new boot command line parameter named "ima_canonical_fmt"
is defined.

Considerations: use of the "ima_canonical_fmt" boot command line option
will break existing userspace applications on big endian systems
expecting the binary_runtime_measurements list to be in platform native
format.

Link: http://lkml.kernel.org/r/1480554346-29071-10-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>
This commit is contained in:
Mimi Zohar
2016-12-19 16:22:57 -08:00
committed by Linus Torvalds
parent c7d0936770
commit d68a6fe9fc
6 changed files with 66 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
security/integrity/ima/ima_kexec.c
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@@ -21,8 +21,7 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
{
struct ima_queue_entry *qe;
struct seq_file file;
struct ima_kexec_hdr khdr = {
.version = 1, .buffer_size = 0, .count = 0};
struct ima_kexec_hdr khdr;
int ret = 0;
/* segment size can't change between kexec load and execute */
@@ -36,6 +35,8 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
file.read_pos = 0;
file.count = sizeof(khdr); /* reserved space */
memset(&khdr, 0, sizeof(khdr));
khdr.version = 1;
list_for_each_entry_rcu(qe, &ima_measurements, later) {
if (file.count < file.size) {
khdr.count++;
@@ -54,7 +55,13 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
* (eg. version, buffer size, number of measurements)
*/
khdr.buffer_size = file.count;
if (ima_canonical_fmt) {
khdr.version = cpu_to_le16(khdr.version);
khdr.count = cpu_to_le64(khdr.count);
khdr.buffer_size = cpu_to_le64(khdr.buffer_size);
}
memcpy(file.buf, &khdr, sizeof(khdr));
print_hex_dump(KERN_DEBUG, "ima dump: ", DUMP_PREFIX_NONE,
16, 1, file.buf,
file.count < 100 ? file.count : 100, true);