This is a note to let you know that I've just added the patch titled
lguest: fix out-by-one error in address checking.
to the 3.14-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:
lguest-fix-out-by-one-error-in-address-checking.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 83a35114d0e4583e6b0ca39502e68b6a92e2910c Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Date: Wed, 27 May 2015 10:59:26 +0930
Subject: lguest: fix out-by-one error in address checking.
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
commit 83a35114d0e4583e6b0ca39502e68b6a92e2910c upstream.
This bug has been there since day 1; addresses in the top guest physical
page weren't considered valid. You could map that page (the check in
check_gpte() is correct), but if a guest tried to put a pagetable there
we'd check that address manually when walking it, and kill the guest.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/lguest/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -176,7 +176,7 @@ static void unmap_switcher(void)
bool lguest_address_ok(const struct lguest *lg,
unsigned long addr, unsigned long len)
{
- return (addr+len) / PAGE_SIZE < lg->pfn_limit && (addr+len >= addr);
+ return addr+len <= lg->pfn_limit * PAGE_SIZE && (addr+len >= addr);
}
/*
Patches currently in stable-queue which might be from rusty@xxxxxxxxxxxxxxx are
queue-3.14/lguest-fix-out-by-one-error-in-address-checking.patch
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