linux-kernel - [PATCH 4.4 11/48] mm/vmstat.c: fix outdated vmstat

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Message-Id: <20181018175428.590247375@linuxfoundation.org>
Date:   Thu, 18 Oct 2018 19:54:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Roman Gushchin <guro@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Oleg Nesterov <oleg@...hat.com>,
        Christoph Lameter <clameter@....com>,
        Kemi Wang <kemi.wang@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 4.4 11/48] mm/vmstat.c: fix outdated vmstat_text

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jann Horn <jannh@...gle.com>

commit 28e2c4bb99aa40f9d5f07ac130cbc4da0ea93079 upstream.

7a9cdebdcc17 ("mm: get rid of vmacache_flush_all() entirely") removed the
VMACACHE_FULL_FLUSHES statistics, but didn't remove the corresponding
entry in vmstat_text.  This causes an out-of-bounds access in
vmstat_show().

Luckily this only affects kernels with CONFIG_DEBUG_VM_VMACACHE=y, which
is probably very rare.

Link: http://lkml.kernel.org/r/20181001143138.95119-1-jannh@google.com
Fixes: 7a9cdebdcc17 ("mm: get rid of vmacache_flush_all() entirely")
Signed-off-by: Jann Horn <jannh@...gle.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
Acked-by: Michal Hocko <mhocko@...e.com>
Acked-by: Roman Gushchin <guro@...com>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Christoph Lameter <clameter@....com>
Cc: Kemi Wang <kemi.wang@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/vmstat.c |    1 -
 1 file changed, 1 deletion(-)

--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -869,7 +869,6 @@ const char * const vmstat_text[] = {
 #ifdef CONFIG_DEBUG_VM_VMACACHE
 	"vmacache_find_calls",
 	"vmacache_find_hits",
-	"vmacache_full_flushes",
 #endif
 #endif /* CONFIG_VM_EVENTS_COUNTERS */
 };