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Message-ID: <166989147114.4906.2929001822083296859.tip-bot2@tip-bot2>
Date: Thu, 01 Dec 2022 10:44:31 -0000
From: "tip-bot2 for Jann Horn" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Jann Horn <jannh@...gle.com>, Thomas Gleixner <tglx@...utronix.de>,
x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: timers/core] vdso/timens: Refactor copy-pasted
find_timens_vvar_page() helper into one copy
The following commit has been merged into the timers/core branch of tip:
Commit-ID: d6c494e8ee932b2b21ff4b718eebb378e91b3da0
Gitweb: https://git.kernel.org/tip/d6c494e8ee932b2b21ff4b718eebb378e91b3da0
Author: Jann Horn <jannh@...gle.com>
AuthorDate: Wed, 30 Nov 2022 12:53:20 +01:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 01 Dec 2022 11:35:40 +01:00
vdso/timens: Refactor copy-pasted find_timens_vvar_page() helper into one copy
find_timens_vvar_page() is not architecture-specific, as can be seen from
how all five per-architecture versions of it are the same.
(arm64, powerpc and riscv are exactly the same; x86 and s390 have two
characters difference inside a comment, less blank lines, and mark the
!CONFIG_TIME_NS version as inline.)
Refactor the five copies into a central copy in kernel/time/namespace.c.
Signed-off-by: Jann Horn <jannh@...gle.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20221130115320.2918447-1-jannh@google.com
---
arch/arm64/kernel/vdso.c | 22 ----------------------
arch/powerpc/kernel/vdso.c | 22 ----------------------
arch/riscv/kernel/vdso.c | 22 ----------------------
arch/s390/kernel/vdso.c | 20 --------------------
arch/x86/entry/vdso/vma.c | 23 -----------------------
include/linux/time_namespace.h | 6 ++++++
kernel/time/namespace.c | 18 ++++++++++++++++++
7 files changed, 24 insertions(+), 109 deletions(-)
diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
index 99ae81a..e59a32a 100644
--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c
@@ -151,28 +151,6 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
mmap_read_unlock(mm);
return 0;
}
-
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- if (likely(vma->vm_mm == current->mm))
- return current->nsproxy->time_ns->vvar_page;
-
- /*
- * VM_PFNMAP | VM_IO protect .fault() handler from being called
- * through interfaces like /proc/$pid/mem or
- * process_vm_{readv,writev}() as long as there's no .access()
- * in special_mapping_vmops.
- * For more details check_vma_flags() and __access_remote_vm()
- */
- WARN(1, "vvar_page accessed remotely");
-
- return NULL;
-}
-#else
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- return NULL;
-}
#endif
static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 4abc019..507f822 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -129,28 +129,6 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
return 0;
}
-
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- if (likely(vma->vm_mm == current->mm))
- return current->nsproxy->time_ns->vvar_page;
-
- /*
- * VM_PFNMAP | VM_IO protect .fault() handler from being called
- * through interfaces like /proc/$pid/mem or
- * process_vm_{readv,writev}() as long as there's no .access()
- * in special_mapping_vmops.
- * For more details check_vma_flags() and __access_remote_vm()
- */
- WARN(1, "vvar_page accessed remotely");
-
- return NULL;
-}
-#else
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- return NULL;
-}
#endif
static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index 123d052..e410275 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -137,28 +137,6 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
mmap_read_unlock(mm);
return 0;
}
-
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- if (likely(vma->vm_mm == current->mm))
- return current->nsproxy->time_ns->vvar_page;
-
- /*
- * VM_PFNMAP | VM_IO protect .fault() handler from being called
- * through interfaces like /proc/$pid/mem or
- * process_vm_{readv,writev}() as long as there's no .access()
- * in special_mapping_vmops.
- * For more details check_vma_flags() and __access_remote_vm()
- */
- WARN(1, "vvar_page accessed remotely");
-
- return NULL;
-}
-#else
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- return NULL;
-}
#endif
static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 3105ca5..d6df716 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -44,21 +44,6 @@ struct vdso_data *arch_get_vdso_data(void *vvar_page)
return (struct vdso_data *)(vvar_page);
}
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- if (likely(vma->vm_mm == current->mm))
- return current->nsproxy->time_ns->vvar_page;
- /*
- * VM_PFNMAP | VM_IO protect .fault() handler from being called
- * through interfaces like /proc/$pid/mem or
- * process_vm_{readv,writev}() as long as there's no .access()
- * in special_mapping_vmops().
- * For more details check_vma_flags() and __access_remote_vm()
- */
- WARN(1, "vvar_page accessed remotely");
- return NULL;
-}
-
/*
* The VVAR page layout depends on whether a task belongs to the root or
* non-root time namespace. Whenever a task changes its namespace, the VVAR
@@ -84,11 +69,6 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
mmap_read_unlock(mm);
return 0;
}
-#else
-static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- return NULL;
-}
#endif
static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 311eae3..6b36485 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -98,24 +98,6 @@ static int vdso_mremap(const struct vm_special_mapping *sm,
}
#ifdef CONFIG_TIME_NS
-static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- if (likely(vma->vm_mm == current->mm))
- return current->nsproxy->time_ns->vvar_page;
-
- /*
- * VM_PFNMAP | VM_IO protect .fault() handler from being called
- * through interfaces like /proc/$pid/mem or
- * process_vm_{readv,writev}() as long as there's no .access()
- * in special_mapping_vmops().
- * For more details check_vma_flags() and __access_remote_vm()
- */
-
- WARN(1, "vvar_page accessed remotely");
-
- return NULL;
-}
-
/*
* The vvar page layout depends on whether a task belongs to the root or
* non-root time namespace. Whenever a task changes its namespace, the VVAR
@@ -140,11 +122,6 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
return 0;
}
-#else
-static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma)
-{
- return NULL;
-}
#endif
static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h
index 3146f1c..bb9d3f5 100644
--- a/include/linux/time_namespace.h
+++ b/include/linux/time_namespace.h
@@ -45,6 +45,7 @@ struct time_namespace *copy_time_ns(unsigned long flags,
void free_time_ns(struct time_namespace *ns);
void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);
struct vdso_data *arch_get_vdso_data(void *vvar_page);
+struct page *find_timens_vvar_page(struct vm_area_struct *vma);
static inline void put_time_ns(struct time_namespace *ns)
{
@@ -141,6 +142,11 @@ static inline void timens_on_fork(struct nsproxy *nsproxy,
return;
}
+static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma)
+{
+ return NULL;
+}
+
static inline void timens_add_monotonic(struct timespec64 *ts) { }
static inline void timens_add_boottime(struct timespec64 *ts) { }
diff --git a/kernel/time/namespace.c b/kernel/time/namespace.c
index aec8328..0775b9e 100644
--- a/kernel/time/namespace.c
+++ b/kernel/time/namespace.c
@@ -192,6 +192,24 @@ static void timens_setup_vdso_data(struct vdso_data *vdata,
offset[CLOCK_BOOTTIME_ALARM] = boottime;
}
+struct page *find_timens_vvar_page(struct vm_area_struct *vma)
+{
+ if (likely(vma->vm_mm == current->mm))
+ return current->nsproxy->time_ns->vvar_page;
+
+ /*
+ * VM_PFNMAP | VM_IO protect .fault() handler from being called
+ * through interfaces like /proc/$pid/mem or
+ * process_vm_{readv,writev}() as long as there's no .access()
+ * in special_mapping_vmops().
+ * For more details check_vma_flags() and __access_remote_vm()
+ */
+
+ WARN(1, "vvar_page accessed remotely");
+
+ return NULL;
+}
+
/*
* Protects possibly multiple offsets writers racing each other
* and tasks entering the namespace.
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