On Mon, Mar 05, 2018 at 12:37:59AM +0000, Ben Hutchings wrote:
On Thu, 2018-02-15 at 16:16 +0100, Greg Kroah-Hartman wrote:
4.4-stable review patch. If anyone has any objections, please let me know.
From: Al Viro viro@zeniv.linux.org.uk
commit 21fc61c73c3903c4c312d0802da01ec2b323d174 upstream.
kmap() in page_follow_link_light() needed to go - allowing to hold an arbitrary number of kmaps for long is a great way to deadlocking the system.
new helper (inode_nohighmem(inode)) needs to be used for pagecache symlinks inodes; done for all in-tree cases. page_follow_link_light() instrumented to yell about anything missed.
Except that this backport only updates ext4 and f2fs (and doesn't add the warning). I suppose that's all matters for Android, but it would be nice to get a more complete backport into 4.4-stable...
That should be all the in-tree users of this, for 4.4, right? If not, ick. Jin, can you look into this?
thanks,
greg k-h