Thread (7 messages) 7 messages, 3 authors, 2016-03-18

Re: [uml-devel] [PATCH] um: fix FPU register double-restore after sigreturn

From: Richard Weinberger <richard@nod.at>
Date: 2016-03-17 22:21:54

Eli,

Am 16.03.2016 um 02:25 schrieb Eli Cooper:
This patch prevents userspace() from incorrectly restoring FPU registers
after a sigreturn or rt_sigreturn system call, which has already restored
FPU registers to the state prior to the signal handler was invoked.

Fixes FPU state corruption after invoking the signal handler.
First of all, thanks a lot for hunting down these nasty issues!

Where exactly are the FPU regs restored in the sigregturn case?
Not sure if I fully understand the error scenario.

Thanks,
//richard

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