LKML Archive on lore.kernel.org
 help / color / Atom feed
* AVX register corruption from signal delivery
@ 2019-11-26 19:49 Barret Rhoden
  2019-11-26 20:20 ` Sebastian Andrzej Siewior
  0 siblings, 1 reply; 14+ messages in thread
From: Barret Rhoden @ 2019-11-26 19:49 UTC (permalink / raw)
  To: Sebastian Andrzej Siewior, Rik van Riel"
  Cc: x86, linux-kernel, Thomas Gleixner, Ingo Molnar, Borislav Petkov

Hi -

The Go Team found a bug[1] where the AVX registers can get corrupted 
during signal delivery.  They were able to bisect it to commits related 
to the "x86: load FPU registers on return to userland" patchset[2].

The bug requires the kernel to be built with GCC 9 to trigger.  In 
particular, arch/x86/kernel/fpu/signal.c needs to be built with GCC 9.

Thanks,

Barret

[1] https://bugzilla.kernel.org/show_bug.cgi?id=205663
[2] 
https://lore.kernel.org/kvm/20190403164156.19645-1-bigeasy@linutronix.de/


^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, back to index

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-26 19:49 AVX register corruption from signal delivery Barret Rhoden
2019-11-26 20:20 ` Sebastian Andrzej Siewior
2019-11-26 21:23   ` Barret Rhoden
2019-11-26 22:13     ` Borislav Petkov
2019-11-26 22:30       ` Andy Lutomirski
2019-11-26 23:00         ` Borislav Petkov
2019-11-27 12:42     ` [PATCH] x86/fpu: Don't cache access to fpu_fpregs_owner_ctx Sebastian Andrzej Siewior
2019-11-27 14:07       ` Borislav Petkov
2019-11-27 18:42         ` Barret Rhoden
2019-11-28  8:53           ` [PATCH v2] " Sebastian Andrzej Siewior
2019-11-28  9:22             ` [tip: x86/urgent] " tip-bot2 for Sebastian Andrzej Siewior
2019-11-29 16:57             ` [PATCH v2] " David Laight
2019-11-29 17:08               ` 'Sebastian Andrzej Siewior'
2019-11-27 15:46       ` [PATCH] " Rik van Riel

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git