From: Mark Brown <broonie@kernel.org>
To: "szabolcs.nagy@arm.com" <szabolcs.nagy@arm.com>
Cc: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
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Subject: Re: [PATCH v9 23/42] Documentation/x86: Add CET shadow stack description
Date: Mon, 3 Jul 2023 19:38:04 +0100 [thread overview]
Message-ID: <16147d5c-3f4c-4be0-8af1-9cd34d010363@sirena.org.uk> (raw)
In-Reply-To: <ZKMRFNSYQBC6S+ga@arm.com>
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On Mon, Jul 03, 2023 at 07:19:00PM +0100, szabolcs.nagy@arm.com wrote:
> The 07/02/2023 18:03, Edgecombe, Rick P wrote:
> > 3. Support more options for shadow stack sizing. (I think you are
> > referring to this conversation:
> > https://lore.kernel.org/lkml/ZAIgrXQ4670gxlE4@arm.com/). I don't see
> > why this is needed for the base implementation. If ARM wants to add a
> > new rlimit or clone variant, I don't see why x86 can't support it
> > later.
> i think it can be added later.
> but it may be important for deployment on some platforms, since a
> libc (or other language runtime) may want to set the shadow stack
> size differently than the kernel default, because
I agree that this can be deferred to later, so long as we err on the
side of large stacks now we can provide an additional limit without
confusing things.
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next prev parent reply other threads:[~2023-07-03 18:38 UTC|newest]
Thread overview: 151+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-13 0:10 [PATCH v9 00/42] Shadow stacks for userspace Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 01/42] mm: Rename arch pte_mkwrite()'s to pte_mkwrite_novma() Rick Edgecombe
2023-06-13 7:19 ` Geert Uytterhoeven
2023-06-13 16:14 ` Edgecombe, Rick P
2023-06-13 7:43 ` Mike Rapoport
2023-06-13 16:14 ` Edgecombe, Rick P
2023-06-13 12:26 ` David Hildenbrand
2023-06-13 16:14 ` Edgecombe, Rick P
2023-06-19 4:27 ` Helge Deller
2023-07-14 22:57 ` Mark Brown
2023-07-17 15:55 ` Edgecombe, Rick P
2023-07-17 16:51 ` Mark Brown
2023-06-13 0:10 ` [PATCH v9 02/42] mm: Move pte/pmd_mkwrite() callers with no VMA to _novma() Rick Edgecombe
2023-06-13 7:44 ` Mike Rapoport
2023-06-13 16:19 ` Edgecombe, Rick P
2023-06-13 17:00 ` David Hildenbrand
2023-06-14 17:00 ` Edgecombe, Rick P
2023-06-13 12:27 ` David Hildenbrand
2023-06-13 16:20 ` Edgecombe, Rick P
2023-06-13 0:10 ` [PATCH v9 03/42] mm: Make pte_mkwrite() take a VMA Rick Edgecombe
2023-06-13 7:42 ` Mike Rapoport
2023-06-13 16:20 ` Edgecombe, Rick P
2023-06-13 12:28 ` David Hildenbrand
2023-06-13 16:21 ` Edgecombe, Rick P
2023-06-13 0:10 ` [PATCH v9 04/42] mm: Re-introduce vm_flags to do_mmap() Rick Edgecombe
2023-06-14 8:49 ` David Hildenbrand
2023-06-14 23:30 ` Mark Brown
2023-06-13 0:10 ` [PATCH v9 05/42] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 Rick Edgecombe
2023-06-14 8:50 ` David Hildenbrand
2023-06-13 0:10 ` [PATCH v9 06/42] x86/shstk: Add Kconfig option for shadow stack Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 07/42] x86/traps: Move control protection handler to separate file Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 08/42] x86/cpufeatures: Add CPU feature flags for shadow stacks Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 09/42] x86/mm: Move pmd_write(), pud_write() up in the file Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 10/42] x86/mm: Introduce _PAGE_SAVED_DIRTY Rick Edgecombe
2023-06-13 16:01 ` Edgecombe, Rick P
2023-06-13 17:58 ` Linus Torvalds
2023-06-13 19:37 ` Edgecombe, Rick P
2023-06-13 0:10 ` [PATCH v9 11/42] x86/mm: Update ptep/pmdp_set_wrprotect() for _PAGE_SAVED_DIRTY Rick Edgecombe
2023-06-13 18:01 ` Linus Torvalds
2023-06-13 0:10 ` [PATCH v9 12/42] x86/mm: Start actually marking _PAGE_SAVED_DIRTY Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 13/42] x86/mm: Remove _PAGE_DIRTY from kernel RO pages Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 14/42] mm: Introduce VM_SHADOW_STACK for shadow stack memory Rick Edgecombe
2023-06-14 8:50 ` David Hildenbrand
2023-06-14 23:31 ` Mark Brown
2023-06-13 0:10 ` [PATCH v9 15/42] x86/mm: Check shadow stack page fault errors Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 16/42] mm: Add guard pages around a shadow stack Rick Edgecombe
2023-06-14 23:34 ` Mark Brown
2023-06-22 18:21 ` Matthew Wilcox
2023-06-22 18:27 ` Edgecombe, Rick P
2023-06-23 7:40 ` Mike Rapoport
2023-06-23 12:17 ` Mark Brown
2023-06-25 16:44 ` Edgecombe, Rick P
2023-06-26 12:45 ` Mark Brown
2023-07-06 23:32 ` [PATCH] x86/shstk: Move arch detail comment out of core mm Rick Edgecombe
2023-07-07 15:08 ` Mark Brown
2023-08-01 16:52 ` Mike Rapoport
2023-06-13 0:10 ` [PATCH v9 17/42] mm: Warn on shadow stack memory in wrong vma Rick Edgecombe
2023-06-14 23:35 ` Mark Brown
2023-06-13 0:10 ` [PATCH v9 18/42] x86/mm: Warn if create Write=0,Dirty=1 with raw prot Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 19/42] mm/mmap: Add shadow stack pages to memory accounting Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 20/42] x86/mm: Introduce MAP_ABOVE4G Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 21/42] x86/mm: Teach pte_mkwrite() about stack memory Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 22/42] mm: Don't allow write GUPs to shadow " Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 23/42] Documentation/x86: Add CET shadow stack description Rick Edgecombe
2023-06-13 11:55 ` Mark Brown
2023-06-13 12:37 ` Florian Weimer
2023-06-13 15:15 ` Mark Brown
2023-06-13 17:11 ` Edgecombe, Rick P
2023-06-13 17:57 ` Mark Brown
2023-06-13 19:57 ` Edgecombe, Rick P
2023-06-14 10:43 ` szabolcs.nagy
2023-06-14 16:57 ` Edgecombe, Rick P
2023-06-19 8:47 ` szabolcs.nagy
2023-06-19 16:44 ` Edgecombe, Rick P
2023-06-20 9:17 ` szabolcs.nagy
2023-06-20 19:34 ` Edgecombe, Rick P
2023-06-21 11:36 ` szabolcs.nagy
2023-06-21 18:54 ` Edgecombe, Rick P
2023-06-21 22:22 ` Edgecombe, Rick P
2023-06-21 23:05 ` H.J. Lu
2023-06-21 23:15 ` Edgecombe, Rick P
2023-06-22 1:07 ` Edgecombe, Rick P
2023-06-22 3:23 ` H.J. Lu
2023-06-22 8:27 ` szabolcs.nagy
2023-06-22 16:47 ` Edgecombe, Rick P
2023-06-23 16:25 ` szabolcs.nagy
2023-06-25 18:48 ` Edgecombe, Rick P
2023-06-21 23:02 ` H.J. Lu
2023-06-22 7:40 ` szabolcs.nagy
2023-06-22 16:46 ` Edgecombe, Rick P
2023-06-26 14:08 ` szabolcs.nagy
2023-06-28 1:23 ` Edgecombe, Rick P
2023-06-22 9:18 ` szabolcs.nagy
2023-06-22 15:26 ` Andy Lutomirski
2023-06-22 16:42 ` szabolcs.nagy
2023-06-22 23:18 ` Edgecombe, Rick P
2023-06-29 16:07 ` szabolcs.nagy
2023-07-02 18:03 ` Edgecombe, Rick P
2023-07-03 13:32 ` Mark Brown
2023-07-03 18:19 ` szabolcs.nagy
2023-07-03 18:38 ` Mark Brown [this message]
2023-07-03 18:49 ` Florian Weimer
2023-07-04 11:33 ` Szabolcs Nagy
2023-07-05 18:45 ` Edgecombe, Rick P
2023-07-05 19:10 ` Mark Brown
2023-07-05 19:17 ` Edgecombe, Rick P
2023-07-05 19:29 ` Mark Brown
2023-07-06 13:14 ` szabolcs.nagy
2023-07-06 14:24 ` Mark Brown
2023-07-06 16:59 ` Edgecombe, Rick P
2023-07-06 19:03 ` Mark Brown
2023-07-06 13:07 ` szabolcs.nagy
2023-07-06 18:25 ` Edgecombe, Rick P
2023-07-07 15:25 ` szabolcs.nagy
2023-07-07 17:37 ` Edgecombe, Rick P
2023-07-10 16:54 ` szabolcs.nagy
2023-07-10 22:56 ` Edgecombe, Rick P
2023-07-11 8:08 ` szabolcs.nagy
2023-07-12 9:39 ` Szabolcs Nagy
2023-06-25 23:52 ` Andy Lutomirski
2023-06-14 13:12 ` Mark Brown
2023-07-18 19:32 ` Szabolcs Nagy
2023-06-13 0:10 ` [PATCH v9 24/42] x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 25/42] x86/fpu: Add helper for modifying xstate Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 26/42] x86: Introduce userspace API for shadow stack Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 27/42] x86/shstk: Add user control-protection fault handler Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 28/42] x86/shstk: Add user-mode shadow stack support Rick Edgecombe
2023-06-27 17:20 ` Mark Brown
2023-06-27 23:46 ` Dave Hansen
2023-06-28 0:37 ` Edgecombe, Rick P
2023-07-06 23:38 ` [PATCH] x86/shstk: Don't retry vm_munmap() on -EINTR Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 29/42] x86/shstk: Handle thread shadow stack Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 30/42] x86/shstk: Introduce routines modifying shstk Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 31/42] x86/shstk: Handle signals for shadow stack Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 32/42] x86/shstk: Check that SSP is aligned on sigreturn Rick Edgecombe
2023-06-13 0:10 ` [PATCH v9 33/42] x86/shstk: Check that signal frame is shadow stack mem Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 34/42] x86/shstk: Introduce map_shadow_stack syscall Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 35/42] x86/shstk: Support WRSS for userspace Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 36/42] x86: Expose thread features in /proc/$PID/status Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 37/42] x86/shstk: Wire in shadow stack interface Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 38/42] x86/cpufeatures: Enable CET CR4 bit for shadow stack Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 39/42] selftests/x86: Add shadow stack test Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 40/42] x86: Add PTRACE interface for shadow stack Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 41/42] x86/shstk: Add ARCH_SHSTK_UNLOCK Rick Edgecombe
2023-06-13 0:11 ` [PATCH v9 42/42] x86/shstk: Add ARCH_SHSTK_STATUS Rick Edgecombe
2023-06-13 1:34 ` [PATCH v9 00/42] Shadow stacks for userspace Linus Torvalds
2023-06-13 3:12 ` Edgecombe, Rick P
2023-06-13 17:44 ` Linus Torvalds
2023-06-13 18:27 ` Linus Torvalds
2023-06-13 19:38 ` Edgecombe, Rick P
2023-06-14 23:45 ` Mark Brown
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