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-rw-r--r--include/linux/kexec.h2
-rw-r--r--kernel/kexec.c9
-rw-r--r--kernel/kexec_core.c6
-rw-r--r--kernel/kexec_file.c8
4 files changed, 23 insertions, 2 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 2cc643c6e870..643ff4a3fbf6 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -317,6 +317,8 @@ int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
Elf_Shdr *sechdrs, unsigned int relsec);
int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
unsigned int relsec);
+void arch_kexec_protect_crashkres(void);
+void arch_kexec_unprotect_crashkres(void);
#else /* !CONFIG_KEXEC_CORE */
struct pt_regs;
diff --git a/kernel/kexec.c b/kernel/kexec.c
index ee70aef5cd81..b44cb3f5a15c 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -167,8 +167,12 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
return -EBUSY;
dest_image = &kexec_image;
- if (flags & KEXEC_ON_CRASH)
+ if (flags & KEXEC_ON_CRASH) {
dest_image = &kexec_crash_image;
+ if (kexec_crash_image)
+ arch_kexec_unprotect_crashkres();
+ }
+
if (nr_segments > 0) {
unsigned long i;
@@ -211,6 +215,9 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
image = xchg(dest_image, image);
out:
+ if ((flags & KEXEC_ON_CRASH) && kexec_crash_image)
+ arch_kexec_protect_crashkres();
+
mutex_unlock(&kexec_mutex);
kimage_free(image);
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index d5d408252992..48b73cc8e425 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -1563,3 +1563,9 @@ void __weak crash_map_reserved_pages(void)
void __weak crash_unmap_reserved_pages(void)
{}
+
+void __weak arch_kexec_protect_crashkres(void)
+{}
+
+void __weak arch_kexec_unprotect_crashkres(void)
+{}
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index c72d2ff5896e..503bc2d348e5 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -274,8 +274,11 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
return -EBUSY;
dest_image = &kexec_image;
- if (flags & KEXEC_FILE_ON_CRASH)
+ if (flags & KEXEC_FILE_ON_CRASH) {
dest_image = &kexec_crash_image;
+ if (kexec_crash_image)
+ arch_kexec_unprotect_crashkres();
+ }
if (flags & KEXEC_FILE_UNLOAD)
goto exchange;
@@ -324,6 +327,9 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
exchange:
image = xchg(dest_image, image);
out:
+ if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image)
+ arch_kexec_protect_crashkres();
+
mutex_unlock(&kexec_mutex);
kimage_free(image);
return ret;