linux-kernel - [PATCH 5.4 3/5] memblock: ensure there is no overflow in memblock_overlaps

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20211213085710.28962-4-mark-pk.tsai@mediatek.com>
Date:   Mon, 13 Dec 2021 16:57:08 +0800
From:   Mark-PK Tsai <mark-pk.tsai@...iatek.com>
To:     <stable@...r.kernel.org>
CC:     <rppt@...nel.org>, <akpm@...ux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux@...linux.org.uk>, <rppt@...ux.ibm.com>, <tony@...mide.com>,
        <wangkefeng.wang@...wei.com>, <mark-pk.tsai@...iatek.com>,
        <yj.chiang@...iatek.com>
Subject: [PATCH 5.4 3/5] memblock: ensure there is no overflow in memblock_overlaps_region()

From: Mike Rapoport <rppt@...ux.ibm.com>

commit 023accf5cdc1e504a9b04187ec23ff156fe53d90 upstream.

There maybe an overflow in memblock_overlaps_region() if it is called with
base and size such that

	base + size > PHYS_ADDR_MAX

Make sure that memblock_overlaps_region() caps the size to prevent such
overflow and remove now duplicated call to memblock_cap_size() from
memblock_is_region_reserved().

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Tested-by: Tony Lindgren <tony@...mide.com>
Link: https://lore.kernel.org/lkml/20210630071211.21011-1-rppt@kernel.org/
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
---
 mm/memblock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 4de2af293f47..e13003ed6ee7 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -164,6 +164,8 @@ bool __init_memblock memblock_overlaps_region(struct memblock_type *type,
 {
 	unsigned long i;
 
+	memblock_cap_size(base, &size);
+
 	for (i = 0; i < type->cnt; i++)
 		if (memblock_addrs_overlap(base, size, type->regions[i].base,
 					   type->regions[i].size))
@@ -1764,7 +1766,6 @@ bool __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t siz
  */
 bool __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
 {
-	memblock_cap_size(base, &size);
 	return memblock_overlaps_region(&memblock.reserved, base, size);
 }
 
-- 
2.18.0