x86/mce: Make machine check speculation protected

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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>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801181626290.1847@nanos

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This commit is contained in:

Thomas Gleixner 2018-01-18 16:28:26 +01:00

parent 6cfb521ac0

commit 6f41c34d69

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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