@@ -4,6 +4,7 @@
struct kimage;
+int crash_load_luks_volume_key(struct kimage *image);
int crash_load_segments(struct kimage *image);
int crash_setup_memmap_entries(struct kimage *image,
struct boot_params *params);
@@ -289,6 +289,7 @@ static int memmap_exclude_ranges(struct kimage *image, struct crash_mem *cmem,
unsigned long long mend)
{
unsigned long start, end;
+ int r;
cmem->ranges[0].start = mstart;
cmem->ranges[0].end = mend;
@@ -297,7 +298,19 @@ static int memmap_exclude_ranges(struct kimage *image, struct crash_mem *cmem,
/* Exclude elf header region */
start = image->elf_load_addr;
end = start + image->elf_headers_sz - 1;
- return crash_exclude_mem_range(cmem, start, end);
+ r = crash_exclude_mem_range(cmem, start, end);
+
+ if (r)
+ return r;
+
+ /* Exclude LUKS volume key region */
+ if (image->luks_volume_key_addr) {
+ start = image->luks_volume_key_addr;
+ end = start + image->luks_volume_key_sz - 1;
+ return crash_exclude_mem_range(cmem, start, end);
+ }
+
+ return r;
}
/* Prepare memory map for crash dump kernel */
@@ -368,6 +381,38 @@ int crash_setup_memmap_entries(struct kimage *image, struct boot_params *params)
return ret;
}
+int crash_load_luks_volume_key(struct kimage *image)
+{
+ int ret;
+ struct kexec_buf kbuf = {
+ .image = image,
+ .buf_min = 0,
+ .buf_max = ULONG_MAX,
+ .top_down = false,
+ .random = true,
+ };
+
+ image->luks_volume_key_addr = 0;
+ ret = crash_pass_temp_luks_volume_key(&kbuf.buffer, &kbuf.bufsz);
+ if (ret)
+ return ret;
+
+ kbuf.memsz = kbuf.bufsz;
+ kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
+ kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
+ ret = kexec_add_buffer(&kbuf);
+ if (ret) {
+ vfree((void *)kbuf.buffer);
+ return ret;
+ }
+ image->luks_volume_key_addr = kbuf.mem;
+ image->luks_volume_key_sz = kbuf.bufsz;
+ pr_debug("Loaded LUKS volume key at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ image->luks_volume_key_addr, kbuf.bufsz, kbuf.bufsz);
+
+ return ret;
+}
+
int crash_load_segments(struct kimage *image)
{
int ret;
@@ -76,6 +76,10 @@ static int setup_cmdline(struct kimage *image, struct boot_params *params,
if (image->type == KEXEC_TYPE_CRASH) {
len = sprintf(cmdline_ptr,
"elfcorehdr=0x%lx ", image->elf_load_addr);
+
+ if (image->luks_volume_key_addr != 0)
+ len += sprintf(cmdline_ptr + len,
+ "luksvolumekey=0x%lx ", image->luks_volume_key_addr);
}
memcpy(cmdline_ptr + len, cmdline, cmdline_len);
cmdline_len += len;
@@ -433,6 +437,9 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
ret = crash_load_segments(image);
if (ret)
return ERR_PTR(ret);
+ ret = crash_load_luks_volume_key(image);
+ if (ret)
+ pr_debug("Either no LUKS volume key or error to retrieve the LUKS volume key\n");
}
/*
@@ -374,6 +374,10 @@ struct kimage {
void *elf_headers;
unsigned long elf_headers_sz;
unsigned long elf_load_addr;
+
+ /* LUKS volume key buffer */
+ unsigned long luks_volume_key_addr;
+ unsigned long luks_volume_key_sz;
};
/* kexec interface functions */
1st kernel will build up the kernel command parameter luksvolumekey as similar to elfcorehdr to pass the memory address of the stored info of LUKS volume key to kdump kernel. Signed-off-by: Coiby Xu <coxu@redhat.com> --- arch/x86/include/asm/crash.h | 1 + arch/x86/kernel/crash.c | 47 ++++++++++++++++++++++++++++++- arch/x86/kernel/kexec-bzimage64.c | 7 +++++ include/linux/kexec.h | 4 +++ 4 files changed, 58 insertions(+), 1 deletion(-)