diff options
| author | Jonathan McDowell <noodles@fb.com> | 2022-06-30 08:36:12 +0000 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-07-01 15:22:16 +0200 |
| commit | b69a2afd5afce9bf6d56e349d6ab592c916e20f2 (patch) | |
| tree | 3406ca4a696ef1e6e3eab66a446ae5dfb56f1c73 /arch/x86/kernel/e820.c | |
| parent | 03c765b0e3b4cb5063276b086c76f7a612856a9a (diff) | |
x86/kexec: Carry forward IMA measurement log on kexec
On kexec file load, the Integrity Measurement Architecture (IMA)
subsystem may verify the IMA signature of the kernel and initramfs, and
measure it. The command line parameters passed to the kernel in the
kexec call may also be measured by IMA.
A remote attestation service can verify a TPM quote based on the TPM
event log, the IMA measurement list and the TPM PCR data. This can
be achieved only if the IMA measurement log is carried over from the
current kernel to the next kernel across the kexec call.
PowerPC and ARM64 both achieve this using device tree with a
"linux,ima-kexec-buffer" node. x86 platforms generally don't make use of
device tree, so use the setup_data mechanism to pass the IMA buffer to
the new kernel.
Signed-off-by: Jonathan McDowell <noodles@fb.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> # IMA function definitions
Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG
Diffstat (limited to 'arch/x86/kernel/e820.c')
| -rw-r--r-- | arch/x86/kernel/e820.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index f267205f2d5a..9dac24680ff8 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -1017,10 +1017,10 @@ void __init e820__reserve_setup_data(void) e820__range_update(pa_data, sizeof(*data)+data->len, E820_TYPE_RAM, E820_TYPE_RESERVED_KERN); /* - * SETUP_EFI is supplied by kexec and does not need to be - * reserved. + * SETUP_EFI and SETUP_IMA are supplied by kexec and do not need + * to be reserved. */ - if (data->type != SETUP_EFI) + if (data->type != SETUP_EFI && data->type != SETUP_IMA) e820__range_update_kexec(pa_data, sizeof(*data) + data->len, E820_TYPE_RAM, E820_TYPE_RESERVED_KERN); |