perf/core: Fix possible Spectre-v1 indexing for ->aux_pages[]
authorPeter Zijlstra <peterz@infradead.org>
Fri, 20 Apr 2018 12:03:18 +0000 (14:03 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 16 May 2018 08:10:31 +0000 (10:10 +0200)
commit 4411ec1d1993e8dbff2898390e3fed280d88e446 upstream.

> kernel/events/ring_buffer.c:871 perf_mmap_to_page() warn: potential spectre issue 'rb->aux_pages'

Userspace controls @pgoff through the fault address. Sanitize the
array index before doing the array dereference.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/events/ring_buffer.c

index f684d8e5fa2be2fd10e4d5e2f1e65a5c2afeb629..c573c733922345d9144cf64f501fd950c710c00b 100644 (file)
@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/circ_buf.h>
 #include <linux/poll.h>
+#include <linux/nospec.h>
 
 #include "internal.h"
 
@@ -863,8 +864,10 @@ perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)
                        return NULL;
 
                /* AUX space */
-               if (pgoff >= rb->aux_pgoff)
-                       return virt_to_page(rb->aux_pages[pgoff - rb->aux_pgoff]);
+               if (pgoff >= rb->aux_pgoff) {
+                       int aux_pgoff = array_index_nospec(pgoff - rb->aux_pgoff, rb->aux_nr_pages);
+                       return virt_to_page(rb->aux_pages[aux_pgoff]);
+               }
        }
 
        return __perf_mmap_to_page(rb, pgoff);