mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
c10e83f598
In order to sanitize the LDT initialization on x86 arch_dup_mmap() must be allowed to fail. Fix up all instances. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirsky <luto@kernel.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bpetkov@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.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: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: dan.j.williams@intel.com Cc: hughd@google.com Cc: keescook@google.com Cc: kirill.shutemov@linux.intel.com Cc: linux-mm@kvack.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
|
|
* linux/arch/unicore32/include/asm/mmu_context.h
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __UNICORE_MMU_CONTEXT_H__
|
|
#define __UNICORE_MMU_CONTEXT_H__
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/vmacache.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/cpu-single.h>
|
|
|
|
#define init_new_context(tsk, mm) 0
|
|
|
|
#define destroy_context(mm) do { } while (0)
|
|
|
|
/*
|
|
* This is called when "tsk" is about to enter lazy TLB mode.
|
|
*
|
|
* mm: describes the currently active mm context
|
|
* tsk: task which is entering lazy tlb
|
|
* cpu: cpu number which is entering lazy tlb
|
|
*
|
|
* tsk->mm will be NULL
|
|
*/
|
|
static inline void
|
|
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* This is the actual mm switch as far as the scheduler
|
|
* is concerned. No registers are touched. We avoid
|
|
* calling the CPU specific function when the mm hasn't
|
|
* actually changed.
|
|
*/
|
|
static inline void
|
|
switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next)
|
|
cpu_switch_mm(next->pgd, next);
|
|
}
|
|
|
|
#define deactivate_mm(tsk, mm) do { } while (0)
|
|
#define activate_mm(prev, next) switch_mm(prev, next, NULL)
|
|
|
|
/*
|
|
* We are inserting a "fake" vma for the user-accessible vector page so
|
|
* gdb and friends can get to it through ptrace and /proc/<pid>/mem.
|
|
* But we also want to remove it before the generic code gets to see it
|
|
* during process exit or the unmapping of it would cause total havoc.
|
|
* (the macro is used as remove_vma() is static to mm/mmap.c)
|
|
*/
|
|
#define arch_exit_mmap(mm) \
|
|
do { \
|
|
struct vm_area_struct *high_vma = find_vma(mm, 0xffff0000); \
|
|
if (high_vma) { \
|
|
BUG_ON(high_vma->vm_next); /* it should be last */ \
|
|
if (high_vma->vm_prev) \
|
|
high_vma->vm_prev->vm_next = NULL; \
|
|
else \
|
|
mm->mmap = NULL; \
|
|
rb_erase(&high_vma->vm_rb, &mm->mm_rb); \
|
|
vmacache_invalidate(mm); \
|
|
mm->map_count--; \
|
|
remove_vma(high_vma); \
|
|
} \
|
|
} while (0)
|
|
|
|
static inline int arch_dup_mmap(struct mm_struct *oldmm,
|
|
struct mm_struct *mm)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void arch_unmap(struct mm_struct *mm,
|
|
struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
}
|
|
|
|
static inline void arch_bprm_mm_init(struct mm_struct *mm,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
}
|
|
|
|
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
|
|
bool write, bool execute, bool foreign)
|
|
{
|
|
/* by default, allow everything */
|
|
return true;
|
|
}
|
|
#endif
|