This is a note to let you know that I've just added the patch titled
UBIFS: fix an mmap and fsync race condition
to the 3.15-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:
ubifs-fix-an-mmap-and-fsync-race-condition.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 691a7c6f28ac90cccd0dbcf81348ea90b211bdd0 Mon Sep 17 00:00:00 2001
From: hujianyang <[email protected]>
Date: Wed, 30 Apr 2014 14:06:06 +0800
Subject: UBIFS: fix an mmap and fsync race condition
From: hujianyang <[email protected]>
commit 691a7c6f28ac90cccd0dbcf81348ea90b211bdd0 upstream.
There is a race condition in UBIFS:
Thread A (mmap) Thread B (fsync)
->__do_fault ->write_cache_pages
-> ubifs_vm_page_mkwrite
-> budget_space
-> lock_page
-> release/convert_page_budget
-> SetPagePrivate
-> TestSetPageDirty
-> unlock_page
-> lock_page
-> TestClearPageDirty
-> ubifs_writepage
-> do_writepage
-> release_budget
-> ClearPagePrivate
-> unlock_page
-> !(ret & VM_FAULT_LOCKED)
-> lock_page
-> set_page_dirty
-> ubifs_set_page_dirty
-> TestSetPageDirty (set page dirty without budgeting)
-> unlock_page
This leads to situation where we have a diry page but no budget allocated for
this page, so further write-back may fail with -ENOSPC.
In this fix we return from page_mkwrite without performing unlock_page. We
return VM_FAULT_LOCKED instead. After doing this, the race above will not
happen.
Signed-off-by: hujianyang <[email protected]>
Tested-by: Laurence Withers <[email protected]>
Signed-off-by: Artem Bityutskiy <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ubifs/file.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1525,8 +1525,7 @@ static int ubifs_vm_page_mkwrite(struct
}
wait_for_stable_page(page);
- unlock_page(page);
- return 0;
+ return VM_FAULT_LOCKED;
out_unlock:
unlock_page(page);
Patches currently in stable-queue which might be from [email protected] are
queue-3.15/ubifs-remove-incorrect-assertion-in-shrink_tnc.patch
queue-3.15/ubifs-fix-an-mmap-and-fsync-race-condition.patch
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