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    x86/mm/pti: Move user W+X check into pti_finalize() · d878efce
    Joerg Roedel 提交于
    The user page-table gets the updated kernel mappings in pti_finalize(),
    which runs after the RO+X permissions got applied to the kernel page-table
    in mark_readonly().
    
    But with CONFIG_DEBUG_WX enabled, the user page-table is already checked in
    mark_readonly() for insecure mappings.  This causes false-positive
    warnings, because the user page-table did not get the updated mappings yet.
    
    Move the W+X check for the user page-table into pti_finalize() after it
    updated all required mappings.
    
    [ tglx: Folded !NX supported fix ]
    Signed-off-by: NJoerg Roedel <jroedel@suse.de>
    Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
    Cc: "H . Peter Anvin" <hpa@zytor.com>
    Cc: linux-mm@kvack.org
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Jiri Kosina <jkosina@suse.cz>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: David Laight <David.Laight@aculab.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Eduardo Valentin <eduval@amazon.com>
    Cc: Greg KH <gregkh@linuxfoundation.org>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: aliguori@amazon.com
    Cc: daniel.gruss@iaik.tugraz.at
    Cc: hughd@google.com
    Cc: keescook@google.com
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Waiman Long <llong@redhat.com>
    Cc: Pavel Machek <pavel@ucw.cz>
    Cc: "David H . Gutteridge" <dhgutteridge@sympatico.ca>
    Cc: joro@8bytes.org
    Link: https://lkml.kernel.org/r/1533727000-9172-1-git-send-email-joro@8bytes.org
    d878efce
dump_pagetables.c 16.6 KB