diff options
| author |   Christopher Yeoh <cyeoh@au1.ibm.com> | 2012-02-02 11:34:09 +1030 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-02-02 12:55:17 -0800 |
| commit | 8cdb878dcb359fd1137e9abdee9322f5e9bcfdf8 (patch) | |
| tree | 146afc01f3c1d7cbc944328484d077032bc53bfd /include | |
| parent | Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux (diff) | |
| download | linux-dev-8cdb878dcb359fd1137e9abdee9322f5e9bcfdf8.tar.xz linux-dev-8cdb878dcb359fd1137e9abdee9322f5e9bcfdf8.zip | |
Fix race in process_vm_rw_core
This fixes the race in process_vm_core found by Oleg (see
http://article.gmane.org/gmane.linux.kernel/1235667/
for details).
This has been updated since I last sent it as the creation of the new
mm_access() function did almost exactly the same thing as parts of the
previous version of this patch did.
In order to use mm_access() even when /proc isn't enabled, we move it to
kernel/fork.c where other related process mm access functions already
are.
Signed-off-by: Chris Yeoh <yeohc@au1.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 2234985a5e65..7d379a6bfd88 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2259,6 +2259,12 @@ static inline void mmdrop(struct mm_struct * mm) extern void mmput(struct mm_struct *); /* Grab a reference to a task's mm, if it is not already going away */ extern struct mm_struct *get_task_mm(struct task_struct *task); +/* + * Grab a reference to a task's mm, if it is not already going away + * and ptrace_may_access with the mode parameter passed to it + * succeeds. + */ +extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); /* Remove the current tasks stale references to the old mm_struct */ extern void mm_release(struct task_struct *, struct mm_struct *); /* Allocate a new mm structure and copy contents from tsk->mm */ |