Messages in this thread | | | Date | Sat, 29 Jun 2019 09:37:32 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH v7 12/18] x86/fsgsbase/64: GSBASE handling with FSGSBASE in the paranoid path |
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On Sat, 29 Jun 2019, Bae, Chang Seok wrote: > > On May 8, 2019, at 03:02, Chang S. Bae <chang.seok.bae@intel.com> wrote: > > > > ENTRY(paranoid_exit) > > … > > + > > + /* On FSGSBASE systems, always restore the stashed GSBASE */ > > + wrgsbase %rbx > > + jmp .Lparanoid_exit_no_swapgs; > > It would crash any time getting a paranoid entry with user GS but kernel CR3. > The issue is thankfully uncovered by Vegard N. A relevant test case will be > published by Andy L. The patch fixes the issue. (Rebased on the tip master.)
Can you please provide a proper patch with a proper changelog?
Thanks,
tglx
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