Re: [PATCH v2] x86/bugs: protect against userspace-userspace spectreRSB

2018-07-30 Thread Konrad Rzeszutek Wilk
On Mon, Jul 30, 2018 at 10:56:55AM -0700, Tim Chen wrote: > On 07/26/2018 04:14 AM, Jiri Kosina wrote: > > From: Jiri Kosina > > > > The article "Spectre Returns! Speculation Attacks using the Return Stack > > Buffer" [1] describes two new (sub-)variants of spectrev2-like attack, > > making

Re: [PATCH v2] x86/bugs: protect against userspace-userspace spectreRSB

2018-07-30 Thread Konrad Rzeszutek Wilk
On Mon, Jul 30, 2018 at 10:56:55AM -0700, Tim Chen wrote: > On 07/26/2018 04:14 AM, Jiri Kosina wrote: > > From: Jiri Kosina > > > > The article "Spectre Returns! Speculation Attacks using the Return Stack > > Buffer" [1] describes two new (sub-)variants of spectrev2-like attack, > > making

Re: [PATCH v2] x86/bugs: protect against userspace-userspace spectreRSB

2018-07-30 Thread Tim Chen
On 07/26/2018 04:14 AM, Jiri Kosina wrote: > From: Jiri Kosina > > The article "Spectre Returns! Speculation Attacks using the Return Stack > Buffer" [1] describes two new (sub-)variants of spectrev2-like attack, > making use solely of the RSB contents even on CPUs that don't fallback to >

Re: [PATCH v2] x86/bugs: protect against userspace-userspace spectreRSB

2018-07-30 Thread Tim Chen
On 07/26/2018 04:14 AM, Jiri Kosina wrote: > From: Jiri Kosina > > The article "Spectre Returns! Speculation Attacks using the Return Stack > Buffer" [1] describes two new (sub-)variants of spectrev2-like attack, > making use solely of the RSB contents even on CPUs that don't fallback to >

[PATCH v2] x86/bugs: protect against userspace-userspace spectreRSB

2018-07-26 Thread Jiri Kosina
From: Jiri Kosina The article "Spectre Returns! Speculation Attacks using the Return Stack Buffer" [1] describes two new (sub-)variants of spectrev2-like attack, making use solely of the RSB contents even on CPUs that don't fallback to BTB on RSB underflow (Skylake+). Mitigate

[PATCH v2] x86/bugs: protect against userspace-userspace spectreRSB

2018-07-26 Thread Jiri Kosina
From: Jiri Kosina The article "Spectre Returns! Speculation Attacks using the Return Stack Buffer" [1] describes two new (sub-)variants of spectrev2-like attack, making use solely of the RSB contents even on CPUs that don't fallback to BTB on RSB underflow (Skylake+). Mitigate