linux-stable.git/arch/x86/kernel/cpu/microcode/intel_early.c, branch v3.18.78

x86/microcode/intel: Guard against stack overflow in the loader

2015-07-13T12:50:05+00:00

[ Upstream commit f84598bd7c851f8b0bf8cd0d7c3be0d73c432ff4 ]

mc_saved_tmp is a static array allocated on the stack, we need to make
sure mc_saved_count stays within its bounds, otherwise we're overflowing
the stack in _save_mc(). A specially crafted microcode header could lead
to a kernel crash or potentially kernel execution.

Signed-off-by: Quentin Casasnovas 
Cc: "H. Peter Anvin" 
Cc: Fenghua Yu 
Link: http://lkml.kernel.org/r/1422964824-22056-1-git-send-email-quentin.casasnovas@oracle.com
Signed-off-by: Borislav Petkov 
Signed-off-by: Sasha Levin

x86/microcode/intel: Fish out the stashed microcode for the BSP

2015-01-08T18:30:22+00:00

commit 25cdb9c86826f8d035d8aaa07fc36832e76bd8a0 upstream.

I'm such a moron! The simple solution of saving the BSP patch
for use on resume was too simple (and wrong!), hint:
sizeof(struct microcode_intel).

What needs to be done instead is to fish out the microcode patch
we have stashed previously and apply that on the BSP in case the
late loader hasn't been utilized.

So do that instead.

Signed-off-by: Borislav Petkov 
Cc: Linus Torvalds 
Link: http://lkml.kernel.org/r/20141208110820.GB20057@pd.tnic
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

x86, microcode: Reload microcode on resume

2015-01-08T18:30:22+00:00

commit fbae4ba8c4a387e306adc9c710e5c225cece7678 upstream.

Normally, we do reapply microcode on resume. However, in the cases where
that microcode comes from the early loader and the late loader hasn't
been utilized yet, there's no easy way for us to go and apply the patch
applied during boot by the early loader.

Thus, reuse the patch stashed by the early loader for the BSP.

Signed-off-by: Borislav Petkov 
Signed-off-by: Greg Kroah-Hartman

x86, microcode, intel: Drop unused parameter

2015-01-08T18:30:22+00:00

commit 47768626c6db42cd06ff077ba12dd2cb10ab818b upstream.

apply_microcode_early() doesn't use mc_saved_data, kill it.

Signed-off-by: Borislav Petkov 
Signed-off-by: Greg Kroah-Hartman

x86, microcode, intel: Fix typos

2014-07-24T10:32:49+00:00

Fix some typos. One of them was in a struct name, fortunately harmless
because it happened on a "sizeof(struct foo*)" construction.

Signed-off-by: Henrique de Moraes Holschuh 
Link: http://lkml.kernel.org/r/1406146251-8540-1-git-send-email-hmh@hmh.eng.br
Signed-off-by: Borislav Petkov

x86, microcode, intel: Add missing static declarations

2014-07-24T10:26:52+00:00

gcc reports that a few declarations are missing.
Fix two obvious ones.

Signed-off-by: Henrique de Moraes Holschuh 
Link: http://lkml.kernel.org/r/1406146251-8540-1-git-send-email-hmh@hmh.eng.br
Signed-off-by: Borislav Petkov

x86, microcode: Move to a proper location

2014-01-13T19:00:12+00:00

We've grown a bunch of microcode loader files all prefixed with
"microcode_". They should be under cpu/ because this is strictly
CPU-related functionality so do that and drop the prefix since they're
in their own directory now which gives that prefix. :)

While at it, drop MICROCODE_INTEL_LIB config item and stash the
functionality under CONFIG_MICROCODE_INTEL as it was its only user.

Signed-off-by: Borislav Petkov 
Tested-by: Aravind Gopalakrishnan