linux-kernel - [PATCH 1/5] lguest: fix spurious BUG

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Message-Id: <200903271021.41091.rusty@rustcorp.com.au>
Date:	Fri, 27 Mar 2009 10:21:40 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	lguest@...abs.org
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH 1/5] lguest: fix spurious BUG_ON() on invalid guest stack.


Impact: fix crash on misbehaving guest

gpte_addr() contains a BUG_ON(), insisting that the present flag is
set.  We need to return before we call it if that isn't the case.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 drivers/lguest/page_tables.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c
--- a/drivers/lguest/page_tables.c
+++ b/drivers/lguest/page_tables.c
@@ -373,8 +373,10 @@ unsigned long guest_pa(struct lg_cpu *cp
 	/* First step: get the top-level Guest page table entry. */
 	gpgd = lgread(cpu, gpgd_addr(cpu, vaddr), pgd_t);
 	/* Toplevel not present?  We can't map it in. */
-	if (!(pgd_flags(gpgd) & _PAGE_PRESENT))
+	if (!(pgd_flags(gpgd) & _PAGE_PRESENT)) {
 		kill_guest(cpu, "Bad address %#lx", vaddr);
+		return -1UL;
+	}
 
 	gpte = lgread(cpu, gpte_addr(gpgd, vaddr), pte_t);
 	if (!(pte_flags(gpte) & _PAGE_PRESENT))

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