Messages in this thread | | | Date | Tue, 25 May 2021 12:00:12 +0100 | From | Catalin Marinas <> | Subject | Re: [PATCH v27 30/31] mm: Update arch_validate_flags() to test vma anonymous |
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On Fri, May 21, 2021 at 03:12:10PM -0700, Yu-cheng Yu wrote: > When newer VM flags are being created, such as VM_MTE, it becomes necessary > for mmap/mprotect to verify if certain flags are being applied to an > anonymous VMA. > > To solve this, one approach is adding a VM flag to track that MAP_ANONYMOUS > is specified [1], and then using the flag in arch_validate_flags(). > > Another approach is passing the VMA to arch_validate_flags(), and check > vma_is_anonymous(). > > To prepare the introduction of PROT_SHADOW_STACK, which creates a shadow > stack mapping and can be applied only to an anonymous VMA, update > arch_validate_flags() to pass in the VMA. > > [1] commit 9f3419315f3c ("arm64: mte: Add PROT_MTE support to mmap() and mprotect()"), > > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> > Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Kees Cook <keescook@chromium.org> > Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> > Cc: Will Deacon <will@kernel.org>
For arm64:
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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