From 7b8589cc29e7c35dcfd2d5138979f17b48f90110 Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Mon, 19 Dec 2016 16:22:48 -0800 Subject: ima: on soft reboot, save 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 uses the kexec buffer passing mechanism to pass the serialized IMA binary_runtime_measurements to the next kernel. Link: http://lkml.kernel.org/r/1480554346-29071-7-git-send-email-zohar@linux.vnet.ibm.com Signed-off-by: Thiago Jung Bauermann Signed-off-by: Mimi Zohar Acked-by: "Eric W. Biederman" Acked-by: Dmitry Kasatkin Cc: Andreas Steffen Cc: Josh Sklar Cc: Dave Young Cc: Vivek Goyal Cc: Baoquan He Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Stewart Smith Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/ima.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'include/linux') diff --git a/include/linux/ima.h b/include/linux/ima.h index 0eb7c2e7f0d6..7f6952f8d6aa 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -11,6 +11,7 @@ #define _LINUX_IMA_H #include +#include struct linux_binprm; #ifdef CONFIG_IMA @@ -23,6 +24,10 @@ extern int ima_post_read_file(struct file *file, void *buf, loff_t size, enum kernel_read_file_id id); extern void ima_post_path_mknod(struct dentry *dentry); +#ifdef CONFIG_IMA_KEXEC +extern void ima_add_kexec_buffer(struct kimage *image); +#endif + #else static inline int ima_bprm_check(struct linux_binprm *bprm) { @@ -62,6 +67,13 @@ static inline void ima_post_path_mknod(struct dentry *dentry) #endif /* CONFIG_IMA */ +#ifndef CONFIG_IMA_KEXEC +struct kimage; + +static inline void ima_add_kexec_buffer(struct kimage *image) +{} +#endif + #ifdef CONFIG_IMA_APPRAISE extern void ima_inode_post_setattr(struct dentry *dentry); extern int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, -- cgit v1.2.3