mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 21:46:43 +07:00
f5252e009d
The /proc/vmallocinfo shows information about vmalloc allocations in vmlist that is a linklist of vm_struct. It, however, may access pages field of vm_struct where a page was not allocated. This results in a null pointer access and leads to a kernel panic. Why this happens: In __vmalloc_node_range() called from vmalloc(), newly allocated vm_struct is added to vmlist at __get_vm_area_node() and then, some fields of vm_struct such as nr_pages and pages are set at __vmalloc_area_node(). In other words, it is added to vmlist before it is fully initialized. At the same time, when the /proc/vmallocinfo is read, it accesses the pages field of vm_struct according to the nr_pages field at show_numa_info(). Thus, a null pointer access happens. The patch adds the newly allocated vm_struct to the vmlist *after* it is fully initialized. So, it can avoid accessing the pages field with unallocated page when show_numa_info() is called. Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Rientjes <rientjes@google.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: <stable@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
160 lines
4.7 KiB
C
160 lines
4.7 KiB
C
#ifndef _LINUX_VMALLOC_H
|
|
#define _LINUX_VMALLOC_H
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/init.h>
|
|
#include <asm/page.h> /* pgprot_t */
|
|
|
|
struct vm_area_struct; /* vma defining user mapping in mm_types.h */
|
|
|
|
/* bits in flags of vmalloc's vm_struct below */
|
|
#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
|
|
#define VM_ALLOC 0x00000002 /* vmalloc() */
|
|
#define VM_MAP 0x00000004 /* vmap()ed pages */
|
|
#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
|
|
#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
|
|
#define VM_UNLIST 0x00000020 /* vm_struct is not listed in vmlist */
|
|
/* bits [20..32] reserved for arch specific ioremap internals */
|
|
|
|
/*
|
|
* Maximum alignment for ioremap() regions.
|
|
* Can be overriden by arch-specific value.
|
|
*/
|
|
#ifndef IOREMAP_MAX_ORDER
|
|
#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
|
|
#endif
|
|
|
|
struct vm_struct {
|
|
struct vm_struct *next;
|
|
void *addr;
|
|
unsigned long size;
|
|
unsigned long flags;
|
|
struct page **pages;
|
|
unsigned int nr_pages;
|
|
phys_addr_t phys_addr;
|
|
void *caller;
|
|
};
|
|
|
|
/*
|
|
* Highlevel APIs for driver use
|
|
*/
|
|
extern void vm_unmap_ram(const void *mem, unsigned int count);
|
|
extern void *vm_map_ram(struct page **pages, unsigned int count,
|
|
int node, pgprot_t prot);
|
|
extern void vm_unmap_aliases(void);
|
|
|
|
#ifdef CONFIG_MMU
|
|
extern void __init vmalloc_init(void);
|
|
#else
|
|
static inline void vmalloc_init(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
extern void *vmalloc(unsigned long size);
|
|
extern void *vzalloc(unsigned long size);
|
|
extern void *vmalloc_user(unsigned long size);
|
|
extern void *vmalloc_node(unsigned long size, int node);
|
|
extern void *vzalloc_node(unsigned long size, int node);
|
|
extern void *vmalloc_exec(unsigned long size);
|
|
extern void *vmalloc_32(unsigned long size);
|
|
extern void *vmalloc_32_user(unsigned long size);
|
|
extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
|
|
extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
|
|
unsigned long start, unsigned long end, gfp_t gfp_mask,
|
|
pgprot_t prot, int node, void *caller);
|
|
extern void vfree(const void *addr);
|
|
|
|
extern void *vmap(struct page **pages, unsigned int count,
|
|
unsigned long flags, pgprot_t prot);
|
|
extern void vunmap(const void *addr);
|
|
|
|
extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
|
|
unsigned long pgoff);
|
|
void vmalloc_sync_all(void);
|
|
|
|
/*
|
|
* Lowlevel-APIs (not for driver use!)
|
|
*/
|
|
|
|
static inline size_t get_vm_area_size(const struct vm_struct *area)
|
|
{
|
|
/* return actual size without guard page */
|
|
return area->size - PAGE_SIZE;
|
|
}
|
|
|
|
extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
|
|
extern struct vm_struct *get_vm_area_caller(unsigned long size,
|
|
unsigned long flags, void *caller);
|
|
extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
|
|
unsigned long start, unsigned long end);
|
|
extern struct vm_struct *__get_vm_area_caller(unsigned long size,
|
|
unsigned long flags,
|
|
unsigned long start, unsigned long end,
|
|
void *caller);
|
|
extern struct vm_struct *remove_vm_area(const void *addr);
|
|
|
|
extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
|
|
struct page ***pages);
|
|
#ifdef CONFIG_MMU
|
|
extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
|
|
pgprot_t prot, struct page **pages);
|
|
extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
|
|
extern void unmap_kernel_range(unsigned long addr, unsigned long size);
|
|
#else
|
|
static inline int
|
|
map_kernel_range_noflush(unsigned long start, unsigned long size,
|
|
pgprot_t prot, struct page **pages)
|
|
{
|
|
return size >> PAGE_SHIFT;
|
|
}
|
|
static inline void
|
|
unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
|
|
{
|
|
}
|
|
static inline void
|
|
unmap_kernel_range(unsigned long addr, unsigned long size)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/* Allocate/destroy a 'vmalloc' VM area. */
|
|
extern struct vm_struct *alloc_vm_area(size_t size);
|
|
extern void free_vm_area(struct vm_struct *area);
|
|
|
|
/* for /dev/kmem */
|
|
extern long vread(char *buf, char *addr, unsigned long count);
|
|
extern long vwrite(char *buf, char *addr, unsigned long count);
|
|
|
|
/*
|
|
* Internals. Dont't use..
|
|
*/
|
|
extern rwlock_t vmlist_lock;
|
|
extern struct vm_struct *vmlist;
|
|
extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
|
|
|
|
#ifdef CONFIG_SMP
|
|
# ifdef CONFIG_MMU
|
|
struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
|
|
const size_t *sizes, int nr_vms,
|
|
size_t align);
|
|
|
|
void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
|
|
# else
|
|
static inline struct vm_struct **
|
|
pcpu_get_vm_areas(const unsigned long *offsets,
|
|
const size_t *sizes, int nr_vms,
|
|
size_t align)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void
|
|
pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
|
|
{
|
|
}
|
|
# endif
|
|
#endif
|
|
|
|
#endif /* _LINUX_VMALLOC_H */
|