Re: [PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges

[PATCH v8 00/27] Control-flow Enforcement: Shadow Stack · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 02/27] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 02/27] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) · Borislav Petkov <bp@alien8.de> · 2019-08-21
Re: [PATCH v8 02/27] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) · Yu-cheng Yu <hidden> · 2019-08-21
[PATCH v8 01/27] Documentation/x86: Add CET description · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 03/27] x86/fpu/xstate: Change names to separate XSAVES system and user states · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 03/27] x86/fpu/xstate: Change names to separate XSAVES system and user states · Borislav Petkov <bp@alien8.de> · 2019-08-21
[PATCH v8 06/27] x86/cet: Add control protection exception handler · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 08/27] mm: Introduce VM_SHSTK for shadow stack memory · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 14/27] x86/mm: Shadow stack page fault error checking · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 15/27] mm: Handle shadow stack page fault · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 15/27] mm: Handle shadow stack page fault · Andy Lutomirski <luto@kernel.org> · 2019-08-13
Re: [PATCH v8 15/27] mm: Handle shadow stack page fault · Yu-cheng Yu <hidden> · 2019-08-14
Re: [PATCH v8 15/27] mm: Handle shadow stack page fault · Dave Hansen <hidden> · 2019-08-14
Re: [PATCH v8 15/27] mm: Handle shadow stack page fault · Yu-cheng Yu <hidden> · 2019-08-14
[PATCH v8 17/27] mm: Update can_follow_write_pte/pmd for shadow stack · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 19/27] x86/cet/shstk: User-mode shadow stack support · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 20/27] x86/cet/shstk: Introduce WRUSS instruction · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file · Dave Martin <Dave.Martin@arm.com> · 2019-08-16
Re: [PATCH v8 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file · Dave Martin <Dave.Martin@arm.com> · 2019-08-20
[PATCH v8 25/27] mm/mmap: Add Shadow stack pages to memory accounting · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 26/27] x86/cet/shstk: Add arch_prctl functions for Shadow Stack · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 27/27] x86/cet/shstk: Add Shadow Stack instructions to opcode map · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 27/27] x86/cet/shstk: Add Shadow Stack instructions to opcode map · Adrian Hunter <adrian.hunter@intel.com> · 2019-11-08
Re: [PATCH v8 27/27] x86/cet/shstk: Add Shadow Stack instructions to opcode map · Yu-cheng Yu <hidden> · 2019-11-08
[PATCH v8 24/27] x86/cet/shstk: Handle thread shadow stack · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 23/27] x86/cet/shstk: ELF header parsing of Shadow Stack · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 21/27] x86/cet/shstk: Handle signals for shadow stack · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 18/27] mm: Introduce do_mmap_locked() · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 18/27] mm: Introduce do_mmap_locked() · Sean Christopherson <hidden> · 2019-08-20
Re: [PATCH v8 18/27] mm: Introduce do_mmap_locked() · Yu-cheng Yu <hidden> · 2019-08-20
[PATCH v8 16/27] mm: Handle THP/HugeTLB shadow stack page fault · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 12/27] drm/i915/gvt: Update _PAGE_DIRTY to _PAGE_DIRTY_BITS · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 13/27] x86/mm: Modify ptep_set_wrprotect and pmdp_set_wrprotect for _PAGE_DIRTY_SW · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 04/27] x86/fpu/xstate: Introduce XSAVES system states · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 04/27] x86/fpu/xstate: Introduce XSAVES system states · Thomas Gleixner <hidden> · 2019-08-16
Re: [PATCH v8 04/27] x86/fpu/xstate: Introduce XSAVES system states · Yu-cheng Yu <hidden> · 2019-08-16
[PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Dave Hansen <hidden> · 2019-08-13
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Andy Lutomirski <luto@amacapital.net> · 2019-08-13
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Yu-cheng Yu <hidden> · 2019-08-14
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Dave Hansen <hidden> · 2019-08-14
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Peter Zijlstra <peterz@infradead.org> · 2019-08-23
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Yu-cheng Yu <hidden> · 2019-08-27
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Peter Zijlstra <peterz@infradead.org> · 2019-08-28
Re: [PATCH v8 11/27] x86/mm: Introduce _PAGE_DIRTY_SW · Yu-cheng Yu <hidden> · 2019-08-28
[PATCH v8 10/27] x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges · Yu-cheng Yu <hidden> · 2019-08-13
Re: [PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges · Dave Hansen <hidden> · 2019-08-13
Re: [PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges · Yu-cheng Yu <hidden> · 2019-08-14
[PATCH v8 05/27] x86/fpu/xstate: Introduce CET MSR system states · Yu-cheng Yu <hidden> · 2019-08-13
[PATCH v8 07/27] x86/cet/shstk: Add Kconfig option for user-mode shadow stack · Yu-cheng Yu <hidden> · 2019-08-13

From: Dave Hansen <hidden>
Date: 2019-08-13 22:34:03
Also in: linux-arch, linux-doc, linux-mm, lkml

On 8/13/19 1:52 PM, Yu-cheng Yu wrote:

To prevent function call/return spills into the next shadow stack
area, do not merge shadow stack areas.

How does this prevent call/return spills?

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