From: Jari Ruusu <jari.ruusu@gmail.com>
To: Borislav Petkov <bp@alien8.de>, Fenghua Yu <fenghua.yu@intel.com>,
Luis Chamberlain <mcgrof@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Fix built-in early-load Intel microcode alignment
Date: Sun, 12 Jan 2020 15:00:53 +0200 [thread overview]
Message-ID: <CACMCwJK-2DHZDA_F5Z3wsEUEKJSc3uOwwPD4HRoYGW7A+kA75w@mail.gmail.com> (raw)
Intel Software Developer's Manual, volume 3, chapter 9.11.6 says:
"Note that the microcode update must be aligned on a 16-byte
boundary and the size of the microcode update must be 1-KByte
granular"
When early-load Intel microcode is loaded from initramfs,
userspace tool 'iucode_tool' has already 16-byte aligned those
microcode bits in that initramfs image. Image that was created
something like this:
iucode_tool --write-earlyfw=FOO.cpio microcode-files...
However, when early-load Intel microcode is loaded from built-in
firmware BLOB using CONFIG_EXTRA_FIRMWARE= kernel config option,
that 16-byte alignment is not guaranteed.
Fix this by forcing all built-in firmware BLOBs to 16-byte
alignment.
Signed-off-by: Jari Ruusu <jari.ruusu@gmail.com>
--- a/drivers/base/firmware_loader/builtin/Makefile
+++ b/drivers/base/firmware_loader/builtin/Makefile
@@ -17,7 +17,7 @@
filechk_fwbin = \
echo "/* Generated by $(src)/Makefile */" ;\
echo " .section .rodata" ;\
- echo " .p2align $(ASM_ALIGN)" ;\
+ echo " .p2align 4" ;\
echo "_fw_$(FWSTR)_bin:" ;\
echo " .incbin \"$(fwdir)/$(FWNAME)\"" ;\
echo "_fw_end:" ;\
--
Jari Ruusu 4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD ACDF F073 3C80 8132 F189
next reply other threads:[~2020-01-12 13:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-12 13:00 Jari Ruusu [this message]
2020-01-12 13:03 ` Fix built-in early-load Intel microcode alignment Jari Ruusu
2020-01-12 14:02 ` Greg KH
2020-01-13 6:30 ` Jari Ruusu
2020-01-13 6:42 ` Greg KH
2020-01-13 15:47 ` Luis Chamberlain
2020-01-13 19:44 ` Linus Torvalds
2020-01-15 2:27 ` Luis Chamberlain
2020-01-18 20:10 ` Bjorn Andersson
2020-01-13 19:58 ` Jari Ruusu
2020-01-13 20:08 ` Borislav Petkov
2020-01-13 20:30 ` Jari Ruusu
2020-01-13 20:46 ` Borislav Petkov
2020-01-15 2:15 ` Luis Chamberlain
2020-01-15 18:46 ` Jari Ruusu
2020-01-15 18:58 ` Luis Chamberlain
2020-01-15 19:41 ` Linus Torvalds
2020-01-15 19:00 ` Andy Lutomirski
2020-01-15 19:15 ` Jari Ruusu
2020-01-15 19:49 ` Linus Torvalds
2020-01-16 6:55 ` Jari Ruusu
2020-01-16 19:16 ` Raj, Ashok
2020-01-17 9:47 ` Jari Ruusu
2020-02-03 20:10 ` Luis Chamberlain
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