To allow direct modification of the elfcorehdr by the kernel, in
response to CPU and memory hot un/plug and/or online/offline events,
the buffer containing the elfcorehdr must be excluded from the
purgatory checksum/digest.
Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx>
---
kexec/kexec.c | 8 ++++++++
kexec/kexec.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/kexec/kexec.c b/kexec/kexec.c
index c59e795..9d0d6cb 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -674,6 +674,14 @@ static void update_purgatory(struct kexec_info *info)
if (info->segment[i].mem == (void *)info->rhdr.rel_addr) {
continue;
}
+
+ /* Don't include elfcorehdr in the checksum, if hotplug
+ * support enabled.
+ */
+ if (do_hotplug && (info->segment[i].mem == (void *)info->elfcorehdr)) {
+ continue;
+ }
+
sha256_update(&ctx, info->segment[i].buf,
info->segment[i].bufsz);
nullsz = info->segment[i].memsz - info->segment[i].bufsz;
diff --git a/kexec/kexec.h b/kexec/kexec.h
index fc24b67..8acbdc1 100644
--- a/kexec/kexec.h
+++ b/kexec/kexec.h
@@ -169,6 +169,7 @@ struct kexec_info {
int command_line_len;
int skip_checks;
+ unsigned long elfcorehdr;
};
struct arch_map_entry {
--
2.31.1
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