Commit b7314518 authored by Jean Delvare's avatar Jean Delvare Committed by Ben Hutchings

firmware: dmi_scan: Fix ordering of product_uuid

commit 5c1ac56b upstream.

In function dmi_present(), dmi_walk_early() calls dmi_table(), which
calls dmi_decode(), which ultimately calls dmi_save_uuid(). This last
function makes a decision based on the value of global variable
dmi_ver. The problem is that this variable is set right _after_
dmi_walk_early() returns. So dmi_save_uuid() always sees dmi_ver == 0
regardless of the actual version implemented.

This causes /sys/class/dmi/id/product_uuid to always use the old
ordering even on systems implementing DMI/SMBIOS 2.6 or later, which
should use the new ordering.

This is broken since kernel v3.8 for legacy DMI implementations and
since kernel v3.10 for SMBIOS 2 implementations. SMBIOS 3
implementations with the 64-bit entry point are not affected.

The first breakage does not matter much as in practice legacy DMI
implementations are always for versions older than 2.6, which is when
the UUID ordering changed. The second breakage is more problematic as
it affects the vast majority of x86 systems manufactured since 2009.
Signed-off-by: default avatarJean Delvare <jdelvare@suse.de>
Fixes: 9f9c9cbb ("drivers/firmware/dmi_scan.c: fetch dmi version from SMBIOS if it exists")
Fixes: 79bae42d ("dmi_scan: refactor dmi_scan_machine(), {smbios,dmi}_present()")
Acked-by: default avatarZhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Artem Savkov <artem.savkov@gmail.com>
Cc: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Cc: Matt Fleming <matt.fleming@intel.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 5c647258
...@@ -438,6 +438,10 @@ static int __init dmi_present(const u8 *buf) ...@@ -438,6 +438,10 @@ static int __init dmi_present(const u8 *buf)
buf += 16; buf += 16;
if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) { if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
if (smbios_ver)
dmi_ver = smbios_ver;
else
dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
dmi_num = (buf[13] << 8) | buf[12]; dmi_num = (buf[13] << 8) | buf[12];
dmi_len = (buf[7] << 8) | buf[6]; dmi_len = (buf[7] << 8) | buf[6];
dmi_base = (buf[11] << 24) | (buf[10] << 16) | dmi_base = (buf[11] << 24) | (buf[10] << 16) |
...@@ -445,12 +449,9 @@ static int __init dmi_present(const u8 *buf) ...@@ -445,12 +449,9 @@ static int __init dmi_present(const u8 *buf)
if (dmi_walk_early(dmi_decode) == 0) { if (dmi_walk_early(dmi_decode) == 0) {
if (smbios_ver) { if (smbios_ver) {
dmi_ver = smbios_ver;
pr_info("SMBIOS %d.%d present.\n", pr_info("SMBIOS %d.%d present.\n",
dmi_ver >> 8, dmi_ver & 0xFF); dmi_ver >> 8, dmi_ver & 0xFF);
} else { } else {
dmi_ver = (buf[14] & 0xF0) << 4 |
(buf[14] & 0x0F);
pr_info("Legacy DMI %d.%d present.\n", pr_info("Legacy DMI %d.%d present.\n",
dmi_ver >> 8, dmi_ver & 0xFF); dmi_ver >> 8, dmi_ver & 0xFF);
} }
......
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