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 v15 15/26] mm: Fixup places that call pte_mkwrite() directly
Date: Tue, 10 Nov 2020 08:22:00 -0800 [thread overview]
Message-ID: <20201110162211.9207-16-yu-cheng.yu@intel.com> (raw)
In-Reply-To: <20201110162211.9207-1-yu-cheng.yu@intel.com>
A shadow stack page is made writable by pte_mkwrite_shstk(), which sets
_PAGE_DIRTY_HW. There are a few places that call pte_mkwrite() directly
and miss the maybe_mkwrite() fixup in the previous patch. Fix them with
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().
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 c48f8df6e502..65c56a5de418 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3536,8 +3536,7 @@ 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);
@@ -4192,7 +4191,7 @@ 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 5ca5842df5db..f27ec0436fce 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2914,8 +2914,7 @@ 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 56c02beb6041..7235b2409422 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:[~2020-11-10 16:24 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 16:21 [PATCH v15 00/26] Control-flow Enforcement: Shadow Stack Yu-cheng Yu
2020-11-10 16:21 ` [PATCH v15 01/26] Documentation/x86: Add CET description Yu-cheng Yu
2020-11-30 18:26 ` Nick Desaulniers
2020-11-30 18:34 ` Yu, Yu-cheng
2020-11-30 19:38 ` Fāng-ruì Sòng
2020-11-30 19:47 ` Yu, Yu-cheng
2020-11-10 16:21 ` [PATCH v15 02/26] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) Yu-cheng Yu
2020-11-10 16:21 ` [PATCH v15 03/26] x86/fpu/xstate: Introduce CET MSR XSAVES supervisor states Yu-cheng Yu
2020-11-26 11:02 ` Borislav Petkov
2020-11-30 17:45 ` [NEEDS-REVIEW] " Dave Hansen
2020-11-30 18:06 ` Yu, Yu-cheng
2020-11-30 18:12 ` Dave Hansen
2020-11-30 18:17 ` Yu, Yu-cheng
2020-11-30 23:16 ` Yu, Yu-cheng
2020-12-01 22:26 ` Dave Hansen
2020-12-01 22:35 ` Yu, Yu-cheng
2020-11-10 16:21 ` [PATCH v15 04/26] x86/cet: Add control-protection fault handler Yu-cheng Yu
2020-11-26 18:49 ` Borislav Petkov
2020-11-10 16:21 ` [PATCH v15 05/26] x86/cet/shstk: Add Kconfig option for user-mode Shadow Stack Yu-cheng Yu
2020-11-27 17:10 ` Borislav Petkov
2020-11-28 16:23 ` Yu, Yu-cheng
2020-11-30 18:15 ` Borislav Petkov
2020-11-30 22:48 ` Yu, Yu-cheng
2020-12-01 16:02 ` Borislav Petkov
2020-11-30 19:56 ` Nick Desaulniers
2020-11-30 20:30 ` Yu, Yu-cheng
2020-11-10 16:21 ` [PATCH v15 06/26] x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW Yu-cheng Yu
2020-12-03 9:19 ` Borislav Petkov
2020-12-03 15:12 ` Dave Hansen
2020-12-03 15:56 ` Yu, Yu-cheng
2020-11-10 16:21 ` [PATCH v15 07/26] x86/mm: Remove _PAGE_DIRTY_HW from kernel RO pages Yu-cheng Yu
2020-12-07 16:36 ` Borislav Petkov
2020-12-07 17:11 ` Yu, Yu-cheng
2020-11-10 16:21 ` [PATCH v15 08/26] x86/mm: Introduce _PAGE_COW Yu-cheng Yu
2020-12-08 17:50 ` Borislav Petkov
2020-12-08 18:25 ` Yu, Yu-cheng
2020-12-08 18:47 ` Borislav Petkov
2020-12-08 19:24 ` Yu, Yu-cheng
2020-12-10 17:41 ` Borislav Petkov
2020-12-10 18:10 ` Yu, Yu-cheng
2020-11-10 16:21 ` [PATCH v15 09/26] drm/i915/gvt: Change _PAGE_DIRTY to _PAGE_DIRTY_BITS Yu-cheng Yu
2020-11-10 16:21 ` [PATCH v15 10/26] x86/mm: Update pte_modify for _PAGE_COW Yu-cheng Yu
2020-11-10 16:21 ` [PATCH v15 11/26] x86/mm: Update ptep_set_wrprotect() and pmdp_set_wrprotect() for transition from _PAGE_DIRTY_HW to _PAGE_COW Yu-cheng Yu
2020-11-10 16:21 ` [PATCH v15 12/26] mm: Introduce VM_SHSTK for shadow stack memory Yu-cheng Yu
2020-11-10 16:21 ` [PATCH v15 13/26] x86/mm: Shadow Stack page fault error checking Yu-cheng Yu
2020-11-10 16:21 ` [PATCH v15 14/26] x86/mm: Update maybe_mkwrite() for shadow stack Yu-cheng Yu
2020-11-10 16:22 ` Yu-cheng Yu [this message]
2020-11-10 16:22 ` [PATCH v15 16/26] mm: Add guard pages around a " Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 17/26] mm/mmap: Add shadow stack pages to memory accounting Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 18/26] mm: Update can_follow_write_pte() for shadow stack Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 19/26] mm: Re-introduce vm_flags to do_mmap() Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 20/26] x86/cet/shstk: User-mode shadow stack support Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 21/26] x86/cet/shstk: Handle signals for shadow stack Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 22/26] binfmt_elf: Define GNU_PROPERTY_X86_FEATURE_1_AND properties Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 23/26] ELF: Introduce arch_setup_elf_property() Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 24/26] x86/cet/shstk: Handle thread shadow stack Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 25/26] x86/cet/shstk: Add arch_prctl functions for " Yu-cheng Yu
2020-11-10 16:22 ` [PATCH v15 26/26] mm: Introduce PROT_SHSTK " Yu-cheng Yu
2020-11-27 9:29 ` [PATCH v15 00/26] Control-flow Enforcement: Shadow Stack Balbir Singh
2020-11-28 16:31 ` Yu, Yu-cheng
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