This patch is preparation to handle sensitive ONE entries:
/proc/<pid>/stat
/proc/<pid>/stack
These files use sequence iterators and we want to keep that logic, and
their internal handler semantics.
The sequence iterators stock the inode in the seq_file->private field,
so in order to keep the semantic and to make the cached permission
checks available during ->read(), we add the 'pid_seq_private' struct
that contains both the inode and the cached permission. It will be the
one referenced in the seq_file->private.
This way the internal handlers of /proc/<pid>/{stat|stack} wont change.
Signed-off-by: Djalal Harouni <tixxdz@xxxxxxxxxx>
---
fs/proc/internal.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index f5c452c..f28e4f01 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -78,6 +78,17 @@ struct proc_inode {
struct inode vfs_inode;
};
+/*
+ * Struct used by some /proc/<pid>/$entries that use sequence
+ * iterators.
+ * This struct will be saved in seq_file->private so seq handlers
+ * can access the inode and the cached permission checks of ->open().
+ */
+struct pid_seq_private {
+ int permitted;
+ struct inode *inode;
+};
+
typedef int (*proc_read_fn_t)(char *page,
struct task_struct *task, int permitted);
--
1.7.11.7
--
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