diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2015-05-27 10:59:26 +0930 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-06-09 13:43:52 -0400 |
| commit | 4941509f057cc50ba8420ac5f5e6ffdf8715c02a (patch) | |
| tree | 06060d69995a8546ecdc41ae6b83e7c747ce18d5 | |
| parent | 45948a314fb5d29f92b8537dcf54888ed78bcecc (diff) | |
| download | linux-stable-4941509f057cc50ba8420ac5f5e6ffdf8715c02a.tar.gz linux-stable-4941509f057cc50ba8420ac5f5e6ffdf8715c02a.tar.bz2 linux-stable-4941509f057cc50ba8420ac5f5e6ffdf8715c02a.zip | |
lguest: fix out-by-one error in address checking.
[ Upstream commit 83a35114d0e4583e6b0ca39502e68b6a92e2910c ]
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@rustcorp.com.au>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/lguest/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index 6590558d1d31..ed70f1e72b24 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -173,7 +173,7 @@ 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); } /* |