From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Wed, 19 Apr 2017 22:11:00 +0000 (-0700)
Subject: nsfs: mark dentry with DCACHE_RCUACCESS
X-Git-Tag: v4.1.12-124.31.3~520
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=d85dd56a51fa6d43a0c11e18b09b07faca8f09d0;p=users%2Fjedix%2Flinux-maple.git

nsfs: mark dentry with DCACHE_RCUACCESS

Andrey reported a use-after-free in __ns_get_path():

  spin_lock include/linux/spinlock.h:299 [inline]
  lockref_get_not_dead+0x19/0x80 lib/lockref.c:179
  __ns_get_path+0x197/0x860 fs/nsfs.c:66
  open_related_ns+0xda/0x200 fs/nsfs.c:143
  sock_ioctl+0x39d/0x440 net/socket.c:1001
  vfs_ioctl fs/ioctl.c:45 [inline]
  do_vfs_ioctl+0x1bf/0x1780 fs/ioctl.c:685
  SYSC_ioctl fs/ioctl.c:700 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691

We are under rcu read lock protection at that point:

        rcu_read_lock();
        d = atomic_long_read(&ns->stashed);
        if (!d)
                goto slow;
        dentry = (struct dentry *)d;
        if (!lockref_get_not_dead(&dentry->d_lockref))
                goto slow;
        rcu_read_unlock();

but don't use a proper RCU API on the free path, therefore a parallel
__d_free() could free it at the same time.  We need to mark the stashed
dentry with DCACHE_RCUACCESS so that __d_free() will be called after all
readers leave RCU.

Fixes: e149ed2b805f ("take the targets of /proc/*/ns/* symlinks to separate fs")
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 073c516ff73557a8f7315066856c04b50383ac34)
Signed-off-by: Brian Maly <brian.maly@oracle.com>

Conflicts:
	fs/nsfs.c

Orabug: 28576290
CVE: CVE-2018-5873

Reviewed-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
---

diff --git a/fs/nsfs.c b/fs/nsfs.c
index 99521e7c492b..845f29e15ac9 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -94,6 +94,7 @@ slow:
 		return ERR_PTR(-ENOMEM);
 	}
 	d_instantiate(dentry, inode);
+	dentry->d_flags |= DCACHE_RCUACCESS;
 	dentry->d_fsdata = (void *)ns_ops;
 	d = atomic_long_cmpxchg(&ns->stashed, 0, (unsigned long)dentry);
 	if (d) {