x86/mce: Make machine check speculation protected

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commit 6f41c34d69 upstream.

The machine check idtentry uses an indirect branch directly from the low
level code. This evades the speculation protection.

Replace it by a direct call into C code and issue the indirect call there
so the compiler can apply the proper speculation protection.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by:Borislav Petkov <bp@alien8.de>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Niced-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801181626290.1847@nanos
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Thomas Gleixner 2018-01-18 16:28:26 +01:00 • committed by Greg Kroah-Hartman

parent 14c7f5bc7a

commit 020c755fdb

3 changed files with 7 additions and 1 deletions

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2

arch/x86/entry/entry_64.S

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1

arch/x86/include/asm/traps.h

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5

arch/x86/kernel/cpu/mcheck/mce.c

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