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authorAlexey Dobriyan <adobriyan@openvz.org>2007-05-08 11:25:45 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 22:15:01 +0400
commit7695650a924a6859910c8c19dfa43b4d08224d66 (patch)
tree5947c3e1b24600b6440468c11b30feeef31eee2c /include/linux
parent79c0b2df79eb56fc71e54c75cd7fb3acf84370f9 (diff)
downloadlinux-7695650a924a6859910c8c19dfa43b4d08224d66.tar.xz
Fix race between proc_get_inode() and remove_proc_entry()
proc_lookup remove_proc_entry =========== ================= lock_kernel(); spin_lock(&proc_subdir_lock); [find PDE with refcount 0] spin_unlock(&proc_subdir_lock); spin_lock(&proc_subdir_lock); [find PDE with refcount 0] [check refcount and free PDE] spin_unlock(&proc_subdir_lock); proc_get_inode: de_get(de); /* boom */ Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/proc_fs.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index f4f7a63cae1f..3469f96bc8b2 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -106,6 +106,9 @@ int task_statm(struct mm_struct *, int *, int *, int *, int *);
char *task_mem(struct mm_struct *, char *);
void clear_refs_smap(struct mm_struct *mm);
+struct proc_dir_entry *de_get(struct proc_dir_entry *de);
+void de_put(struct proc_dir_entry *de);
+
extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
struct proc_dir_entry *parent);
extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);