diff options
| author | Stephen Wilson <wilsons@start.ca> | 2011-03-13 20:49:20 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-23 21:36:57 +0100 |
| commit | 5ddd36b9c59887c6416e21daf984fbdd9b1818df (patch) | |
| tree | 1cc7ce9a671f4c49dc594e1f5d1fc8b596e77b5f | |
| parent | mm: factor out main logic of access_process_vm (diff) | |
| download | linux-5ddd36b9c59887c6416e21daf984fbdd9b1818df.tar.xz linux-5ddd36b9c59887c6416e21daf984fbdd9b1818df.zip | |
mm: implement access_remote_vm
Provide an alternative to access_process_vm that allows the caller to obtain a
reference to the supplied mm_struct.
Signed-off-by: Stephen Wilson <wilsons@start.ca>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | include/linux/mm.h | 2 | ||||
| -rw-r--r-- | mm/memory.c | 16 |
2 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 9d6efefdde50..60011d26bffc 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -971,6 +971,8 @@ static inline int handle_mm_fault(struct mm_struct *mm, extern int make_pages_present(unsigned long addr, unsigned long end); extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); +extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, + void *buf, int len, int write); int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int len, unsigned int foll_flags, diff --git a/mm/memory.c b/mm/memory.c index 820b4c4810f0..468f5076754c 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3711,6 +3711,22 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, return buf - old_buf; } +/** + * @access_remote_vm - access another process' address space + * @mm: the mm_struct of the target address space + * @addr: start address to access + * @buf: source or destination buffer + * @len: number of bytes to transfer + * @write: whether the access is a write + * + * The caller must hold a reference on @mm. + */ +int access_remote_vm(struct mm_struct *mm, unsigned long addr, + void *buf, int len, int write) +{ + return __access_remote_vm(NULL, mm, addr, buf, len, write); +} + /* * Access another process' address space. * Source/target buffer must be kernel space, |