This is a note to let you know that I've just added the patch titled
Make file credentials available to the seqfile interfaces
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
make-file-credentials-available-to-the-seqfile-interfaces.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 34dbbcdbf63360661ff7bda6c5f52f99ac515f92 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 14 Apr 2016 11:22:00 -0700
Subject: Make file credentials available to the seqfile interfaces
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
commit 34dbbcdbf63360661ff7bda6c5f52f99ac515f92 upstream.
A lot of seqfile users seem to be using things like %pK that uses the
credentials of the current process, but that is actually completely
wrong for filesystem interfaces.
The unix semantics for permission checking files is to check permissions
at _open_ time, not at read or write time, and that is not just a small
detail: passing off stdin/stdout/stderr to a suid application and making
the actual IO happen in privileged context is a classic exploit
technique.
So if we want to be able to look at permissions at read time, we need to
use the file open credentials, not the current ones. Normal file
accesses can just use "f_cred" (or any of the helper functions that do
that, like file_ns_capable()), but the seqfile interfaces do not have
any such options.
It turns out that seq_file _does_ save away the user_ns information of
the file, though. Since user_ns is just part of the full credential
information, replace that special case with saving off the cred pointer
instead, and suddenly seq_file has all the permission information it
needs.
[sumits: this is used in Ubuntu as a fix for CVE-2015-8944]
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/seq_file.c | 7 ++++---
include/linux/seq_file.h | 13 ++++---------
2 files changed, 8 insertions(+), 12 deletions(-)
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -72,9 +72,10 @@ int seq_open(struct file *file, const st
mutex_init(&p->lock);
p->op = op;
-#ifdef CONFIG_USER_NS
- p->user_ns = file->f_cred->user_ns;
-#endif
+
+ // No refcounting: the lifetime of 'p' is constrained
+ // to the lifetime of the file.
+ p->file = file;
/*
* Wrappers around seq_open(e.g. swaps_open) need to be
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -7,13 +7,10 @@
#include <linux/mutex.h>
#include <linux/cpumask.h>
#include <linux/nodemask.h>
+#include <linux/fs.h>
+#include <linux/cred.h>
struct seq_operations;
-struct file;
-struct path;
-struct inode;
-struct dentry;
-struct user_namespace;
struct seq_file {
char *buf;
@@ -27,9 +24,7 @@ struct seq_file {
struct mutex lock;
const struct seq_operations *op;
int poll_event;
-#ifdef CONFIG_USER_NS
- struct user_namespace *user_ns;
-#endif
+ const struct file *file;
void *private;
};
@@ -147,7 +142,7 @@ int seq_release_private(struct inode *,
static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
{
#ifdef CONFIG_USER_NS
- return seq->user_ns;
+ return seq->file->f_cred->user_ns;
#else
extern struct user_namespace init_user_ns;
return &init_user_ns;
Patches currently in stable-queue which might be from torvalds@xxxxxxxxxxxxxxxxxxxx are
queue-4.4/sched-cgroup-move-sched_online_group-back-into-css_online-to-fix-crash.patch
queue-4.4/proc-iomem-only-expose-physical-resource-addresses-to-privileged-users.patch
queue-4.4/drm-vmwgfx-fix-gcc-7.1.1-warning.patch
queue-4.4/isdn-i4l-fix-buffer-overflow.patch
queue-4.4/make-file-credentials-available-to-the-seqfile-interfaces.patch