|
|
fd304b |
From 364055211b1956539c6a6268e111e244e1292c8c Mon Sep 17 00:00:00 2001
|
|
|
fd304b |
From: Jean Delvare <jdelvare@suse.de>
|
|
|
fd304b |
Date: Mon, 2 Nov 2015 09:45:31 +0100
|
|
|
fd304b |
Subject: [PATCH 8/9] dmidecode: Use read_file() to read the DMI table from
|
|
|
fd304b |
sysfs
|
|
|
fd304b |
|
|
|
fd304b |
We shouldn't use mem_chunk() to read the DMI table from sysfs. This
|
|
|
fd304b |
will fail for SMBIOS v3 implementations which specify a maximum length
|
|
|
fd304b |
for the table rather than its exact length. The kernel will trim the
|
|
|
fd304b |
table to the actual length, so the DMI file will be shorter than the
|
|
|
fd304b |
length announced in entry point.
|
|
|
fd304b |
|
|
|
fd304b |
read_file() fits the bill in this case, as it deals with end of file
|
|
|
fd304b |
nicely.
|
|
|
fd304b |
|
|
|
fd304b |
This also helps with corrupted DMI tables, as the kernel will not
|
|
|
fd304b |
export the part of the table that it wasn't able to parse, effectively
|
|
|
fd304b |
trimming it.
|
|
|
fd304b |
|
|
|
fd304b |
This fixes bug #46176:
|
|
|
fd304b |
https://savannah.nongnu.org/bugs/?46176
|
|
|
fd304b |
Unexpected end of file error
|
|
|
fd304b |
---
|
|
|
fd304b |
CHANGELOG | 3 +++
|
|
|
fd304b |
dmidecode.c | 29 +++++++++++++++++++++--------
|
|
|
fd304b |
2 files changed, 24 insertions(+), 8 deletions(-)
|
|
|
fd304b |
|
|
|
fd304b |
diff --git a/CHANGELOG b/CHANGELOG
|
|
|
fd304b |
index 1e5437a..fcfc244 100644
|
|
|
fd304b |
--- a/CHANGELOG
|
|
|
fd304b |
+++ b/CHANGELOG
|
|
|
fd304b |
@@ -2,6 +2,9 @@
|
|
|
fd304b |
|
|
|
fd304b |
* dmidecode.c, util.c, util.h: Let read_file return the actual data
|
|
|
fd304b |
size.
|
|
|
fd304b |
+ * dmidecode.c: Use read_file to read the DMI table from sysfs.
|
|
|
fd304b |
+ This fixes Savannah bug #46176:
|
|
|
fd304b |
+ https://savannah.nongnu.org/bugs/?46176
|
|
|
fd304b |
|
|
|
fd304b |
2015-10-21 Xie XiuQi <xiexiuqi@huawei.com>
|
|
|
fd304b |
|
|
|
fd304b |
diff --git a/dmidecode.c b/dmidecode.c
|
|
|
fd304b |
index a43cfd1..16d1823 100644
|
|
|
fd304b |
--- a/dmidecode.c
|
|
|
fd304b |
+++ b/dmidecode.c
|
|
|
fd304b |
@@ -4524,16 +4524,29 @@ static void dmi_table(off_t base, u32 len, u16 num, u16 ver, const char *devmem,
|
|
|
fd304b |
printf("\n");
|
|
|
fd304b |
}
|
|
|
fd304b |
|
|
|
fd304b |
- /*
|
|
|
fd304b |
- * When we are reading the DMI table from sysfs, we want to print
|
|
|
fd304b |
- * the address of the table (done above), but the offset of the
|
|
|
fd304b |
- * data in the file is 0. When reading from /dev/mem, the offset
|
|
|
fd304b |
- * in the file is the address.
|
|
|
fd304b |
- */
|
|
|
fd304b |
if (flags & FLAG_NO_FILE_OFFSET)
|
|
|
fd304b |
- base = 0;
|
|
|
fd304b |
+ {
|
|
|
fd304b |
+ /*
|
|
|
fd304b |
+ * When reading from sysfs, the file may be shorter than
|
|
|
fd304b |
+ * announced. For SMBIOS v3 this is expcted, as we only know
|
|
|
fd304b |
+ * the maximum table size, not the actual table size. For older
|
|
|
fd304b |
+ * implementations (and for SMBIOS v3 too), this would be the
|
|
|
fd304b |
+ * result of the kernel truncating the table on parse error.
|
|
|
fd304b |
+ */
|
|
|
fd304b |
+ size_t size = len;
|
|
|
fd304b |
+ buf = read_file(&size, devmem);
|
|
|
fd304b |
+ if (!(opt.flags & FLAG_QUIET) && num && size != (size_t)len)
|
|
|
fd304b |
+ {
|
|
|
fd304b |
+ printf("Wrong DMI structures length: %u bytes "
|
|
|
fd304b |
+ "announced, only %lu bytes available.\n",
|
|
|
fd304b |
+ len, (unsigned long)size);
|
|
|
fd304b |
+ }
|
|
|
fd304b |
+ len = size;
|
|
|
fd304b |
+ }
|
|
|
fd304b |
+ else
|
|
|
fd304b |
+ buf = mem_chunk(base, len, devmem);
|
|
|
fd304b |
|
|
|
fd304b |
- if ((buf = mem_chunk(base, len, devmem)) == NULL)
|
|
|
fd304b |
+ if (buf == NULL)
|
|
|
fd304b |
{
|
|
|
fd304b |
fprintf(stderr, "Table is unreachable, sorry."
|
|
|
fd304b |
#ifndef USE_MMAP
|
|
|
fd304b |
--
|
|
|
fd304b |
2.5.0
|
|
|
fd304b |
|