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-rw-r--r--arch/um/kernel/skas/Makefile2
-rw-r--r--arch/um/kernel/skas/clone.c2
-rw-r--r--arch/um/kernel/skas/mmu.c18
-rw-r--r--arch/um/kernel/skas/process.c4
-rw-r--r--arch/um/kernel/skas/syscall.c4
-rw-r--r--arch/um/kernel/skas/uaccess.c9
6 files changed, 26 insertions, 13 deletions
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
index 5bd3edfcfedf..f3d494a4fd9b 100644
--- a/arch/um/kernel/skas/Makefile
+++ b/arch/um/kernel/skas/Makefile
@@ -1,6 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
#
# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
-# Licensed under the GPL
#
obj-y := clone.o mmu.o process.o syscall.o uaccess.o
diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c
index 0f25d41b1031..bfb70c456b30 100644
--- a/arch/um/kernel/skas/clone.c
+++ b/arch/um/kernel/skas/clone.c
@@ -1,7 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
*/
#include <signal.h>
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index 29e7f5f9f188..3f0d9a573fd6 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -1,7 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
*/
#include <linux/mm.h>
@@ -19,15 +19,21 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
unsigned long kernel)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pgd = pgd_offset(mm, proc);
- pud = pud_alloc(mm, pgd, proc);
- if (!pud)
+
+ p4d = p4d_alloc(mm, pgd, proc);
+ if (!p4d)
goto out;
+ pud = pud_alloc(mm, p4d, proc);
+ if (!pud)
+ goto out_pud;
+
pmd = pmd_alloc(mm, pud, proc);
if (!pmd)
goto out_pmd;
@@ -44,6 +50,8 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
pmd_free(mm, pmd);
out_pmd:
pud_free(mm, pud);
+ out_pud:
+ p4d_free(mm, p4d);
out:
return -ENOMEM;
}
@@ -63,12 +71,12 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
if (current->mm != NULL && current->mm != &init_mm)
from_mm = &current->mm->context;
- block_signals();
+ block_signals_trace();
if (from_mm)
to_mm->id.u.pid = copy_context_skas0(stack,
from_mm->id.u.pid);
else to_mm->id.u.pid = start_userspace(stack);
- unblock_signals();
+ unblock_signals_trace();
if (to_mm->id.u.pid < 0) {
ret = to_mm->id.u.pid;
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index d4dbf08722d6..f2ac134c9752 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
*/
#include <linux/init.h>
@@ -19,7 +19,7 @@ static int __init start_kernel_proc(void *unused)
{
int pid;
- block_signals();
+ block_signals_trace();
pid = os_getpid();
cpu_tasks[0].pid = pid;
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
index 44bb10785075..40d90dddf3f1 100644
--- a/arch/um/kernel/skas/syscall.c
+++ b/arch/um/kernel/skas/syscall.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
*/
#include <linux/kernel.h>
@@ -35,7 +35,7 @@ void handle_syscall(struct uml_pt_regs *r)
goto out;
/* Do the seccomp check after ptrace; failures should be fast. */
- if (secure_computing(NULL) == -1)
+ if (secure_computing() == -1)
goto out;
syscall = UPT_SYSCALL_NR(r);
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index bd3cb694322c..d617f8dc9c19 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
*/
#include <linux/err.h>
@@ -17,6 +17,7 @@
pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
@@ -27,7 +28,11 @@ pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr)
if (!pgd_present(*pgd))
return NULL;
- pud = pud_offset(pgd, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (!p4d_present(*p4d))
+ return NULL;
+
+ pud = pud_offset(p4d, addr);
if (!pud_present(*pud))
return NULL;
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