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It is unsafe to allow saving of secretmem areas to the hibernation snapshot as they would be visible after the resume and this essentially will defeat the purpose of secret memory mappings. Prevent hibernation whenever there are active secret memory users. Link: https://lkml.kernel.org/r/20210518072034.31572-6-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christopher Lameter <cl@linux.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Elena Reshetova <elena.reshetova@intel.com> Cc: Hagen Paul Pfeifer <hagen@jauu.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Palmer Dabbelt <palmerdabbelt@google.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Roman Gushchin <guro@fb.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tycho Andersen <tycho@tycho.ws> Cc: Will Deacon <will@kernel.org> Cc: kernel test robot <lkp@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _LINUX_SECRETMEM_H
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#define _LINUX_SECRETMEM_H
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#ifdef CONFIG_SECRETMEM
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extern const struct address_space_operations secretmem_aops;
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static inline bool page_is_secretmem(struct page *page)
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{
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struct address_space *mapping;
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/*
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* Using page_mapping() is quite slow because of the actual call
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* instruction and repeated compound_head(page) inside the
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* page_mapping() function.
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* We know that secretmem pages are not compound and LRU so we can
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* save a couple of cycles here.
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*/
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if (PageCompound(page) || !PageLRU(page))
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return false;
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mapping = (struct address_space *)
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((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
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if (mapping != page->mapping)
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return false;
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return mapping->a_ops == &secretmem_aops;
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}
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bool vma_is_secretmem(struct vm_area_struct *vma);
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bool secretmem_active(void);
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#else
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static inline bool vma_is_secretmem(struct vm_area_struct *vma)
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{
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return false;
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}
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static inline bool page_is_secretmem(struct page *page)
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{
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return false;
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}
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static inline bool secretmem_active(void)
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{
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return false;
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}
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#endif /* CONFIG_SECRETMEM */
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#endif /* _LINUX_SECRETMEM_H */
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