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From 82497fa02d60757c2cfa645cf89a79abb1435273 Mon Sep 17 00:00:00 2001
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From: Jean Delvare <jdelvare@suse.de>
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Date: Fri, 16 Nov 2018 11:18:25 +0100
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Subject: [PATCH 2/5] dmidecode: Don't use memcpy on /dev/mem on arm64
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On arm64, calling memcpy on /dev/mem will cause a bus error if the
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start and the end of the buffer are not aligned on a 64-bit boundary.
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Using option --no-sysfs triggers this.
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Use a slow manual byte-by-byte copy in that case, to prevent the bus
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error. This is only a fallback path (at least on Linux) and not
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performance-critical anyway, as it is a one-time operation and DMI
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tables are usually not too large.
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This fixes bug #55026:
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https://savannah.nongnu.org/bugs/index.php?55026
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Signed-off-by: Jean Delvare <jdelvare@suse.de>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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config.h | 5 +++++
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util.c | 14 +++++++++++++-
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2 files changed, 18 insertions(+), 1 deletion(-)
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diff --git a/config.h b/config.h
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index e39091fde502..423735537fa8 100644
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--- a/config.h
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+++ b/config.h
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@@ -26,4 +26,9 @@
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#define ALIGNMENT_WORKAROUND
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#endif
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+/* Avoid unaligned memcpy on /dev/mem */
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+#ifdef __aarch64__
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+#define USE_SLOW_MEMCPY
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+#endif
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+
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#endif
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diff --git a/util.c b/util.c
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index eeffdae8e536..04aaadd5b913 100644
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--- a/util.c
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+++ b/util.c
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@@ -155,6 +155,18 @@ void *read_file(off_t base, size_t *max_len, const char *filename)
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return p;
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}
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+static void safe_memcpy(void *dest, const void *src, size_t n)
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+{
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+#ifdef USE_SLOW_MEMCPY
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+ size_t i;
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+
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+ for (i = 0; i < n; i++)
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+ *((u8 *)dest + i) = *((const u8 *)src + i);
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+#else
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+ memcpy(dest, src, n);
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+#endif
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+}
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+
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/*
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* Copy a physical memory chunk into a memory buffer.
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* This function allocates memory.
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@@ -214,7 +226,7 @@ void *mem_chunk(off_t base, size_t len, const char *devmem)
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if (mmp == MAP_FAILED)
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goto try_read;
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- memcpy(p, (u8 *)mmp + mmoffset, len);
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+ safe_memcpy(p, (u8 *)mmp + mmoffset, len);
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if (munmap(mmp, mmoffset + len) == -1)
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{
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--
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2.17.1
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