x86/shstk: Add ARCH_SHSTK_UNLOCK

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Userspace loaders may lock features before a CRIU restore operation has
the chance to set them to whatever state is required by the process
being restored. Allow a way for CRIU to unlock features. Add it as an
arch_prctl() like the other shadow stack operations, but restrict it being
called by the ptrace arch_pctl() interface.

[Merged into recent API changes, added commit log and docs]

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Tested-by: Pengfei Xu <pengfei.xu@intel.com>
Tested-by: John Allen <john.allen@amd.com>
Tested-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/all/20230613001108.3040476-42-rick.p.edgecombe%40intel.com

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This commit is contained in:

Mike Rapoport 2023-06-12 17:11:07 -07:00 • committed by Dave Hansen

parent 2fab02b25a

commit 680ed2f15e

4 changed files with 13 additions and 2 deletions

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4

Documentation/arch/x86/shstk.rst

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1

arch/x86/include/uapi/asm/prctl.h

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1

arch/x86/kernel/process_64.c

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9

arch/x86/kernel/shstk.c

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