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Open Source and information security mailing list archives
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Date: Mon, 24 Aug 2020 17:33:46 -0700 From: Andy Lutomirski <luto@...nel.org> To: Yu-cheng Yu <yu-cheng.yu@...el.com> Cc: X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, LKML <linux-kernel@...r.kernel.org>, "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>, linux-arch <linux-arch@...r.kernel.org>, Linux API <linux-api@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>, Andy Lutomirski <luto@...nel.org>, Balbir Singh <bsingharora@...il.com>, Borislav Petkov <bp@...en8.de>, Cyrill Gorcunov <gorcunov@...il.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Eugene Syromiatnikov <esyr@...hat.com>, Florian Weimer <fweimer@...hat.com>, "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, Mike Kravetz <mike.kravetz@...cle.com>, Nadav Amit <nadav.amit@...il.com>, Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>, Peter Zijlstra <peterz@...radead.org>, Randy Dunlap <rdunlap@...radead.org>, "Ravi V. Shankar" <ravi.v.shankar@...el.com>, Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>, Dave Martin <Dave.Martin@....com>, Weijiang Yang <weijiang.yang@...el.com> Subject: Re: [PATCH v11 8/9] x86/vdso: Insert endbr32/endbr64 to vDSO On Mon, Aug 24, 2020 at 5:30 PM Yu-cheng Yu <yu-cheng.yu@...el.com> wrote: > > From: "H.J. Lu" <hjl.tools@...il.com> > > When Indirect Branch Tracking (IBT) is enabled, vDSO functions may be > called indirectly, and must have ENDBR32 or ENDBR64 as the first > instruction. The compiler must support -fcf-protection=branch so that it > can be used to compile vDSO. > > Signed-off-by: H.J. Lu <hjl.tools@...il.com> > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com> > Acked-by: Andy Lutomirski <luto@...nel.org> I revoke my Ack. Please don't repeat the list of object files. Maybe add the option to CFL? --Andy
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