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s390/kexec_file: Disable kexec_load when IPLed secure

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A kernel loaded via kexec_load cannot be verified. Thus disable kexec_load
systemcall in kernels which where IPLed securely. Use the IMA mechanism to
do so.

Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Philipp Rudo 2019-03-26 15:45:53 +01:00 committed by Martin Schwidefsky
parent 99feaa717e
commit 268a784049
3 changed files with 17 additions and 1 deletions
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2
arch/s390/kernel/Makefile
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@ -77,6 +77,8 @@ obj-$(CONFIG_JUMP_LABEL) += jump_label.o
obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o
obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o
obj-$(CONFIG_IMA) += ima_arch.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf_common.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf_common.o
obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf.o perf_cpum_sf.o obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf.o perf_cpum_sf.o
obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o

14
arch/s390/kernel/ima_arch.c Normal file
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@ -0,0 +1,14 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/ima.h>
#include <asm/boot_data.h>
bool arch_ima_get_secureboot(void)
{
return ipl_secure_flag;
}
const char * const *arch_get_ima_policy(void)
{
return NULL;
}

2
include/linux/ima.h
View File

@ -31,7 +31,7 @@ extern void ima_post_path_mknod(struct dentry *dentry);
extern void ima_add_kexec_buffer(struct kimage *image); extern void ima_add_kexec_buffer(struct kimage *image);
#endif #endif
#if defined(CONFIG_X86) && defined(CONFIG_EFI) #if (defined(CONFIG_X86) && defined(CONFIG_EFI)) || defined(CONFIG_S390)
extern bool arch_ima_get_secureboot(void); extern bool arch_ima_get_secureboot(void);
extern const char * const *arch_get_ima_policy(void); extern const char * const *arch_get_ima_policy(void);
#else #else