From: Yu-cheng Yu <yu-cheng.yu@intel.com>
To: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-api@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Andy Lutomirski <luto@kernel.org>,
Balbir Singh <bsingharora@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Eugene Syromiatnikov <esyr@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kees Cook <keescook@chromium.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Peter Zijlstra <peterz@infradead.org>,
Randy Dunlap <rdunlap@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
Dave Martin <Dave.Martin@arm.com>,
Weijiang Yang <weijiang.yang@intel.com>,
Pengfei Xu <pengfei.xu@intel.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Subject: [PATCH v19 15/25] mm: Fixup places that call pte_mkwrite() directly
Date: Wed, 3 Feb 2021 14:55:37 -0800 [thread overview]
Message-ID: <20210203225547.32221-16-yu-cheng.yu@intel.com> (raw)
In-Reply-To: <20210203225547.32221-1-yu-cheng.yu@intel.com>
When serving a page fault, maybe_mkwrite() makes a PTE writable if it is in
a writable vma. A shadow stack vma is writable, but its PTEs need
_PAGE_DIRTY to be set to become writable. For this reason, maybe_mkwrite()
has been updated.
There are a few places that call pte_mkwrite() directly, but effect the
same result as from maybe_mkwrite(). These sites need to be updated for
shadow stack as well. Thus, change them to maybe_mkwrite():
- do_anonymous_page() and migrate_vma_insert_page() check VM_WRITE directly
and call pte_mkwrite(), which is the same as maybe_mkwrite(). Change
them to maybe_mkwrite().
- In do_numa_page(), if the numa entry 'was-writable', then pte_mkwrite()
is called directly. Fix it by doing maybe_mkwrite().
- In change_pte_range(), pte_mkwrite() is called directly. Replace it with
maybe_mkwrite().
A shadow stack vma is writable but has different vma
flags, and handled accordingly in maybe_mkwrite().
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
mm/memory.c | 5 ++---
mm/migrate.c | 3 +--
mm/mprotect.c | 2 +-
3 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index feff48e1465a..1de649c61013 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3549,8 +3549,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
entry = mk_pte(page, vma->vm_page_prot);
entry = pte_sw_mkyoung(entry);
- if (vma->vm_flags & VM_WRITE)
- entry = pte_mkwrite(pte_mkdirty(entry));
+ entry = maybe_mkwrite(pte_mkdirty(entry), vma);
vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address,
&vmf->ptl);
@@ -4205,7 +4204,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
pte = pte_modify(old_pte, vma->vm_page_prot);
pte = pte_mkyoung(pte);
if (was_writable)
- pte = pte_mkwrite(pte);
+ pte = maybe_mkwrite(pte, vma);
ptep_modify_prot_commit(vma, vmf->address, vmf->pte, old_pte, pte);
update_mmu_cache(vma, vmf->address, vmf->pte);
diff --git a/mm/migrate.c b/mm/migrate.c
index c0efe921bca5..8878d75c0db7 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2964,8 +2964,7 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate,
}
} else {
entry = mk_pte(page, vma->vm_page_prot);
- if (vma->vm_flags & VM_WRITE)
- entry = pte_mkwrite(pte_mkdirty(entry));
+ entry = maybe_mkwrite(pte_mkdirty(entry), vma);
}
ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index ab709023e9aa..ed26e675c423 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -135,7 +135,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
if (dirty_accountable && pte_dirty(ptent) &&
(pte_soft_dirty(ptent) ||
!(vma->vm_flags & VM_SOFTDIRTY))) {
- ptent = pte_mkwrite(ptent);
+ ptent = maybe_mkwrite(ptent, vma);
}
ptep_modify_prot_commit(vma, addr, pte, oldpte, ptent);
pages++;
--
2.21.0
next prev parent reply other threads:[~2021-02-03 23:00 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-03 22:55 [PATCH v19 00/25] Control-flow Enforcement: Shadow Stack Yu-cheng Yu
2021-02-03 22:55 ` [PATCH v19 01/25] Documentation/x86: Add CET description Yu-cheng Yu
2021-02-04 19:52 ` Kees Cook
2021-02-04 20:03 ` Yu, Yu-cheng
2021-02-03 22:55 ` [PATCH v19 02/25] x86/cet/shstk: Add Kconfig option for user-mode control-flow protection Yu-cheng Yu
2021-02-04 19:56 ` Kees Cook
2021-02-05 0:05 ` Yu, Yu-cheng
2021-02-03 22:55 ` [PATCH v19 03/25] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) Yu-cheng Yu
2021-02-04 19:57 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 04/25] x86/cpufeatures: Introduce X86_FEATURE_CET and setup functions Yu-cheng Yu
2021-02-04 19:58 ` Kees Cook
2021-02-05 13:43 ` Borislav Petkov
2021-02-05 16:15 ` Yu, Yu-cheng
2021-02-03 22:55 ` [PATCH v19 05/25] x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states Yu-cheng Yu
2021-02-04 19:59 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 06/25] x86/cet: Add control-protection fault handler Yu-cheng Yu
2021-02-04 20:09 ` Kees Cook
2021-02-05 0:10 ` Yu, Yu-cheng
2021-02-05 13:59 ` Borislav Petkov
2021-02-05 18:00 ` Yu, Yu-cheng
2021-02-05 18:29 ` Kees Cook
2021-02-08 18:20 ` Borislav Petkov
2021-02-08 18:50 ` Yu, Yu-cheng
2021-02-08 18:53 ` Borislav Petkov
2021-02-08 19:23 ` Yu, Yu-cheng
2021-02-08 19:48 ` Borislav Petkov
2021-02-08 20:11 ` Yu, Yu-cheng
2021-02-03 22:55 ` [PATCH v19 07/25] x86/mm: Remove _PAGE_DIRTY from kernel RO pages Yu-cheng Yu
2021-02-04 20:10 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 08/25] x86/mm: Introduce _PAGE_COW Yu-cheng Yu
2021-02-04 20:19 ` Kees Cook
2021-02-04 20:27 ` Dave Hansen
2021-02-05 18:41 ` Yu, Yu-cheng
2021-02-08 23:03 ` Yu, Yu-cheng
2021-02-05 18:58 ` Yu, Yu-cheng
2021-02-03 22:55 ` [PATCH v19 09/25] drm/i915/gvt: Change _PAGE_DIRTY to _PAGE_DIRTY_BITS Yu-cheng Yu
2021-02-03 22:55 ` [PATCH v19 10/25] x86/mm: Update pte_modify for _PAGE_COW Yu-cheng Yu
2021-02-04 20:20 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 11/25] x86/mm: Update ptep_set_wrprotect() and pmdp_set_wrprotect() for transition from _PAGE_DIRTY to _PAGE_COW Yu-cheng Yu
2021-02-04 20:21 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 12/25] mm: Introduce VM_SHSTK for shadow stack memory Yu-cheng Yu
2021-02-04 20:46 ` Cyrill Gorcunov
2021-02-04 21:48 ` Yu, Yu-cheng
2021-02-03 22:55 ` [PATCH v19 13/25] x86/mm: Shadow Stack page fault error checking Yu-cheng Yu
2021-02-03 22:55 ` [PATCH v19 14/25] x86/mm: Update maybe_mkwrite() for shadow stack Yu-cheng Yu
2021-02-04 20:22 ` Kees Cook
2021-02-03 22:55 ` Yu-cheng Yu [this message]
2021-02-04 20:22 ` [PATCH v19 15/25] mm: Fixup places that call pte_mkwrite() directly Kees Cook
2021-02-03 22:55 ` [PATCH v19 16/25] mm: Add guard pages around a shadow stack Yu-cheng Yu
2021-02-04 20:24 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 17/25] mm/mmap: Add shadow stack pages to memory accounting Yu-cheng Yu
2021-02-04 20:24 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 18/25] mm: Update can_follow_write_pte() for shadow stack Yu-cheng Yu
2021-02-04 20:27 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 19/25] mm: Re-introduce vm_flags to do_mmap() Yu-cheng Yu
2021-02-04 20:28 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 20/25] x86/cet/shstk: User-mode shadow stack support Yu-cheng Yu
2021-02-04 20:29 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 21/25] x86/cet/shstk: Handle signals for shadow stack Yu-cheng Yu
2021-02-03 22:55 ` [PATCH v19 22/25] ELF: Introduce arch_setup_elf_property() Yu-cheng Yu
2021-02-04 20:33 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 23/25] x86/cet/shstk: Handle thread shadow stack Yu-cheng Yu
2021-02-03 22:55 ` [PATCH v19 24/25] x86/cet/shstk: Add arch_prctl functions for " Yu-cheng Yu
2021-02-04 20:35 ` Kees Cook
2021-02-04 23:41 ` Yu, Yu-cheng
2021-02-05 18:26 ` Kees Cook
2021-02-03 22:55 ` [PATCH v19 25/25] mm: Introduce PROT_SHSTK " Yu-cheng Yu
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