Eric Lee / linux-smarc-t335x-v3.2

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Commit 5ddd36b9c59887c6416e21daf984fbdd9b1818df

Authored by Stephen Wilson
Committed by Al Viro
1 parent 206cb63657
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

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>

Showing 2 changed files with 18 additions and 0 deletions Side-by-side Diff

... ... @@ -971,6 +971,8 @@
971 971  
972 972 extern int make_pages_present(unsigned long addr, unsigned long end);
973 973 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
  974 +extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
  975 + void *buf, int len, int write);
974 976  
975 977 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
976 978 unsigned long start, int len, unsigned int foll_flags,
... ... @@ -3711,6 +3711,22 @@
3711 3711 return buf - old_buf;
3712 3712 }
3713 3713  
  3714 +/**
  3715 + * @access_remote_vm - access another process' address space
  3716 + * @mm: the mm_struct of the target address space
  3717 + * @addr: start address to access
  3718 + * @buf: source or destination buffer
  3719 + * @len: number of bytes to transfer
  3720 + * @write: whether the access is a write
  3721 + *
  3722 + * The caller must hold a reference on @mm.
  3723 + */
  3724 +int access_remote_vm(struct mm_struct *mm, unsigned long addr,
  3725 + void *buf, int len, int write)
  3726 +{
  3727 + return __access_remote_vm(NULL, mm, addr, buf, len, write);
  3728 +}
  3729 +
3714 3730 /*
3715 3731 * Access another process' address space.
3716 3732 * Source/target buffer must be kernel space,