From b69a2afd5afce9bf6d56e349d6ab592c916e20f2 Mon Sep 17 00:00:00 2001 From: Jonathan McDowell Date: Thu, 30 Jun 2022 08:36:12 +0000 Subject: 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 Signed-off-by: Borislav Petkov Reviewed-by: Mimi Zohar # IMA function definitions Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG --- include/linux/of.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include/linux/of.h') diff --git a/include/linux/of.h b/include/linux/of.h index f0a5d6b10c5a..20a4e7cb7afe 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -441,8 +441,6 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image, unsigned long initrd_load_addr, unsigned long initrd_len, const char *cmdline, size_t extra_fdt_size); -int ima_get_kexec_buffer(void **addr, size_t *size); -int ima_free_kexec_buffer(void); #else /* CONFIG_OF */ static inline void of_core_init(void) -- cgit v1.2.3