3.2.54-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Linus Torvalds <torva...@linux-foundation.org>
commit f12d5bfceb7e1f9051563381ec047f7f13956c3c upstream.
The hugepage code had the exact same bug that regular pages had in
commit 7485d0d3758e ("futexes: Remove rw parameter from
get_futex_key()").
The regular page case was fixed by commit 9ea71503a8ed ("futex: Fix
regression with read only mappings"), but the transparent hugepage case
(added in a5b338f2b0b1: "thp: update futex compound knowledge") case
remained broken.
Found by Dave Jones and his trinity tool.
Reported-and-tested-by: Dave Jones <da...@fedoraproject.org>
Acked-by: Thomas Gleixner <t...@linutronix.de>
Cc: Mel Gorman <mgor...@suse.de>
Cc: Darren Hart <dvh...@linux.intel.com>
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Oleg Nesterov <o...@redhat.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
kernel/futex.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -285,7 +285,7 @@ again:
put_page(page);
/* serialize against __split_huge_page_splitting() */
local_irq_disable();
- if (likely(__get_user_pages_fast(address, 1, 1, &page) == 1)) {
+ if (likely(__get_user_pages_fast(address, 1, !ro, &page) == 1))
{
page_head = compound_head(page);
/*
* page_head is valid pointer but we must pin
--
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