Re: [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack

[PATCH v26 00/30] Control-flow Enforcement: Shadow Stack · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 01/30] Documentation/x86: Add CET description · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 03/30] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 02/30] x86/cet/shstk: Add Kconfig option for Shadow Stack · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 04/30] x86/cpufeatures: Introduce CPU setup and option parsing for CET · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 05/30] x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 06/30] x86/cet: Add control-protection fault handler · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 07/30] x86/mm: Remove _PAGE_DIRTY from kernel RO pages · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 08/30] x86/mm: Move pmd_write(), pud_write() up in the file · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 09/30] x86/mm: Introduce _PAGE_COW · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 10/30] drm/i915/gvt: Change _PAGE_DIRTY to _PAGE_DIRTY_BITS · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 11/30] x86/mm: Update pte_modify for _PAGE_COW · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 12/30] x86/mm: Update ptep_set_wrprotect() and pmdp_set_wrprotect() for transition from _PAGE_DIRTY to _PAGE_COW · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 13/30] mm: Introduce VM_SHADOW_STACK for shadow stack memory · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 14/30] x86/mm: Shadow Stack page fault error checking · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 16/30] mm: Fixup places that call pte_mkwrite() directly · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 15/30] x86/mm: Update maybe_mkwrite() for shadow stack · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 17/30] mm: Add guard pages around a shadow stack. · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 18/30] mm/mmap: Add shadow stack pages to memory accounting · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 20/30] mm/mprotect: Exclude shadow stack from preserve_write · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 19/30] mm: Update can_follow_write_pte() for shadow stack · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 21/30] mm: Re-introduce vm_flags to do_mmap() · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 22/30] x86/cet/shstk: Add user-mode shadow stack support · Yu-cheng Yu <hidden> · 2021-04-27
Re: [PATCH v26 22/30] x86/cet/shstk: Add user-mode shadow stack support · Borislav Petkov <bp@alien8.de> · 2021-04-28
Re: [PATCH v26 22/30] x86/cet/shstk: Add user-mode shadow stack support · Yu, Yu-cheng <hidden> · 2021-04-28
Re: [PATCH v26 22/30] x86/cet/shstk: Add user-mode shadow stack support · Borislav Petkov <bp@alien8.de> · 2021-04-29
Re: [PATCH v26 22/30] x86/cet/shstk: Add user-mode shadow stack support · Yu, Yu-cheng <hidden> · 2021-04-29
Re: [PATCH v26 22/30] x86/cet/shstk: Add user-mode shadow stack support · Borislav Petkov <bp@alien8.de> · 2021-04-29
[PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Yu-cheng Yu <hidden> · 2021-04-27
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Borislav Petkov <bp@alien8.de> · 2021-05-17
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Yu, Yu-cheng <hidden> · 2021-05-17
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Eugene Syromiatnikov <hidden> · 2021-05-18
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Borislav Petkov <bp@alien8.de> · 2021-05-18
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Yu, Yu-cheng <hidden> · 2021-05-18
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Yu, Yu-cheng <hidden> · 2021-05-18
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Borislav Petkov <bp@alien8.de> · 2021-05-18
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Yu, Yu-cheng <hidden> · 2021-05-21
Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines · Borislav Petkov <bp@alien8.de> · 2021-05-21
[PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack · Yu-cheng Yu <hidden> · 2021-04-27
Re: [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack · Borislav Petkov <bp@alien8.de> · 2021-05-10
Re: [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack · Yu, Yu-cheng <hidden> · 2021-05-10
Re: [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack · Borislav Petkov <bp@alien8.de> · 2021-05-11
RE: [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack · David Laight <hidden> · 2021-05-12
Re: [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack · Yu, Yu-cheng <hidden> · 2021-05-11
Re: [PATCH v26 23/30] x86/cet/shstk: Handle thread shadow stack · Borislav Petkov <bp@alien8.de> · 2021-05-12
[PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack · Yu-cheng Yu <hidden> · 2021-04-27
extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Andy Lutomirski <luto@kernel.org> · 2021-04-28
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Yu, Yu-cheng <hidden> · 2021-04-28
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Cyrill Gorcunov <hidden> · 2021-04-29
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Andy Lutomirski <luto@kernel.org> · 2021-04-29
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Cyrill Gorcunov <hidden> · 2021-04-29
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Yu, Yu-cheng <hidden> · 2021-04-30
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Andy Lutomirski <luto@kernel.org> · 2021-04-30
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Yu, Yu-cheng <hidden> · 2021-04-30
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Yu, Yu-cheng <hidden> · 2021-05-04
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Yu, Yu-cheng <hidden> · 2021-05-06
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Andy Lutomirski <luto@kernel.org> · 2021-05-06
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Andy Lutomirski <luto@kernel.org> · 2021-05-02
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · "H. Peter Anvin" <hpa@zytor.com> · 2021-05-03
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Yu, Yu-cheng <hidden> · 2021-05-03
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Andy Lutomirski <luto@amacapital.net> · 2021-05-03
Re: extending ucontext (Re: [PATCH v26 25/30] x86/cet/shstk: Handle signals for shadow stack) · Yu, Yu-cheng <hidden> · 2021-05-03
[PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Yu-cheng Yu <hidden> · 2021-04-27
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Borislav Petkov <bp@alien8.de> · 2021-05-19
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Yu, Yu-cheng <hidden> · 2021-05-19
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Borislav Petkov <bp@alien8.de> · 2021-05-20
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Yu, Yu-cheng <hidden> · 2021-05-20
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Borislav Petkov <bp@alien8.de> · 2021-05-20
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Yu, Yu-cheng <hidden> · 2021-05-20
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Matthew Wilcox <willy@infradead.org> · 2021-05-20
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Yu, Yu-cheng <hidden> · 2021-05-20
Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property() · Yu, Yu-cheng <hidden> · 2021-05-20
[PATCH v26 27/30] x86/cet/shstk: Add arch_prctl functions for shadow stack · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 28/30] mm: Move arch_calc_vm_prot_bits() to arch/x86/include/asm/mman.h · Yu-cheng Yu <hidden> · 2021-04-27
[PATCH v26 29/30] mm: Update arch_validate_flags() to test vma anonymous · Yu-cheng Yu <hidden> · 2021-04-27
Re: [PATCH v26 29/30] mm: Update arch_validate_flags() to test vma anonymous · Kirill A. Shutemov <hidden> · 2021-05-11
[PATCH v26 30/30] mm: Introduce PROT_SHADOW_STACK for shadow stack · Yu-cheng Yu <hidden> · 2021-04-27
Re: [PATCH v26 30/30] mm: Introduce PROT_SHADOW_STACK for shadow stack · Kirill A. Shutemov <hidden> · 2021-05-11
Re: [PATCH v26 30/30] mm: Introduce PROT_SHADOW_STACK for shadow stack · Yu, Yu-cheng <hidden> · 2021-05-11
Re: [PATCH v26 00/30] Control-flow Enforcement: Shadow Stack · Borislav Petkov <bp@alien8.de> · 2021-04-29
Re: [PATCH v26 00/30] Control-flow Enforcement: Shadow Stack · Yu, Yu-cheng <hidden> · 2021-04-29
Re: [PATCH v26 00/30] Control-flow Enforcement: Shadow Stack · Borislav Petkov <bp@alien8.de> · 2021-04-29

From: Borislav Petkov <bp@alien8.de>
Date: 2021-05-12 18:06:05
Also in: linux-arch, linux-doc, linux-mm, lkml

On Tue, May 11, 2021 at 11:35:03AM -0700, Yu, Yu-cheng wrote:

io_bitmap_share() does refcount_inc(&current->thread.io_bitmap->refcnt), and
the function won't fail.  However, shadow stack allocation can fail.  So,
maybe leave io_bitmap_share() at the end?

Yap, makes sense.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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