Messages in this thread | | | Subject | Re: [PATCH v27 30/31] mm: Update arch_validate_flags() to test vma anonymous | From | "Yu, Yu-cheng" <> | Date | Tue, 25 May 2021 08:03:20 -0700 |
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On 5/25/2021 4:00 AM, Catalin Marinas wrote: > 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> >
Thanks!
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