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x86/mm/pti: Clone entry-text again in pti_finalize()

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The mapping for entry-text might have changed in the kernel after it was
cloned to the user page-table. Clone again to update the user page-table to
bring the mapping in sync with the kernel again.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Pavel Machek <pavel@ucw.cz>
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: "David H . Gutteridge" <dhgutteridge@sympatico.ca>
Cc: joro@8bytes.org
Link: https://lkml.kernel.org/r/1531906876-13451-31-git-send-email-joro@8bytes.org
This commit is contained in:
Joerg Roedel 2018-07-18 11:41:07 +02:00 committed by Thomas Gleixner
parent b976690f5d
commit ba0364e260
1 changed files with 9 additions and 4 deletions
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13
arch/x86/mm/pti.c
View file

@ -404,7 +404,7 @@ static void __init pti_setup_espfix64(void)
/*
* Clone the populated PMDs of the entry and irqentry text and force it RO.
*/
static void __init pti_clone_entry_text(void)
static void pti_clone_entry_text(void)
{
pti_clone_pmds((unsigned long) __entry_text_start,
(unsigned long) __irqentry_text_end,
@ -528,13 +528,18 @@ void __init pti_init(void)
}
/*
* Finalize the kernel mappings in the userspace page-table.
* Finalize the kernel mappings in the userspace page-table. Some of the
* mappings for the kernel image might have changed since pti_init()
* cloned them. This is because parts of the kernel image have been
* mapped RO and/or NX. These changes need to be cloned again to the
* userspace page-table.
*/
void pti_finalize(void)
{
/*
* Do this after all of the manipulation of the
* kernel text page tables are complete.
* We need to clone everything (again) that maps parts of the
* kernel image.
*/
pti_clone_entry_text();
pti_clone_kernel_text();
}