From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: alastair@d-silva.org
Cc: Michal Hocko <mhocko@suse.com>,
David Hildenbrand <david@redhat.com>,
linux-kernel@vger.kernel.org,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Paul Mackerras <paulus@samba.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH] powerpc: Perform a bounds check in arch_add_memory
Date: Tue, 27 Aug 2019 15:20:46 +1000 [thread overview]
Message-ID: <20190827052047.31547-1-alastair@au1.ibm.com> (raw)
From: Alastair D'Silva <alastair@d-silva.org>
It is possible for firmware to allocate memory ranges outside
the range of physical memory that we support (MAX_PHYSMEM_BITS).
This patch adds a bounds check to ensure that any hotplugged
memory is addressable.
Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
arch/powerpc/mm/mem.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 9191a66b3bc5..de18fb73de30 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -111,6 +111,9 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
unsigned long nr_pages = size >> PAGE_SHIFT;
int rc;
+ if ((start + size - 1) >> MAX_PHYSMEM_BITS)
+ return -EINVAL;
+
resize_hpt_for_hotplug(memblock_phys_mem_size());
start = (unsigned long)__va(start);
--
2.21.0
next reply other threads:[~2019-08-27 5:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-27 5:20 Alastair D'Silva [this message]
2019-08-27 6:28 ` [PATCH] powerpc: Perform a bounds check in arch_add_memory Michal Hocko
2019-08-27 6:39 ` Alastair D'Silva
2019-08-27 7:13 ` David Hildenbrand
2019-09-01 23:54 ` Alastair D'Silva
2019-09-02 7:28 ` David Hildenbrand
2019-09-04 5:25 ` Alastair D'Silva
2019-09-05 7:52 ` David Hildenbrand
2019-08-27 7:18 ` Michal Hocko
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