dmidecode: Don't use memcpy on /dev/mem on arm64

On arm64, calling memcpy on /dev/mem will cause a bus error if the
start and the end of the buffer are not aligned on a 64-bit boundary.
Using option --no-sysfs triggers this.

Use a slow manual byte-by-byte copy in that case, to prevent the bus
error. This is only a fallback path (at least on Linux) and not
performance-critical anyway, as it is a one-time operation and DMI
tables are usually not too large.

This fixes bug #55026:
https://savannah.nongnu.org/bugs/index.php?55026

Signed-off-by: Jean Delvare <jdelvare@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/config.h b/config.h
index e39091f..4237355 100644
--- a/config.h
+++ b/config.h
@@ -26,4 +26,9 @@
 #define ALIGNMENT_WORKAROUND
 #endif
 
+/* Avoid unaligned memcpy on /dev/mem */
+#ifdef __aarch64__
+#define USE_SLOW_MEMCPY
+#endif
+
 #endif