linux-kernel - [PATCH AUTOSEL 4.9 14/24] kasan, slab: fix conflicts with CONFIG_HARDENED

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Message-Id: <20190313191647.160171-14-sashal@kernel.org>
Date:   Wed, 13 Mar 2019 15:16:37 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-mm@...ck.org
Subject: [PATCH AUTOSEL 4.9 14/24] kasan, slab: fix conflicts with CONFIG_HARDENED_USERCOPY

From: Andrey Konovalov <andreyknvl@...gle.com>

[ Upstream commit 219667c23c68eb3dbc0d5662b9246f28477fe529 ]

Similarly to commit 96fedce27e13 ("kasan: make tag based mode work with
CONFIG_HARDENED_USERCOPY"), we need to reset pointer tags in
__check_heap_object() in mm/slab.c before doing any pointer math.

Link: http://lkml.kernel.org/r/9a5c0f958db10e69df5ff9f2b997866b56b7effc.1550602886.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Tested-by: Qian Cai <cai@....pw>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Evgeniy Stepanov <eugenis@...gle.com>
Cc: Kostya Serebryany <kcc@...gle.com>
Cc: Vincenzo Frascino <vincenzo.frascino@....com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 mm/slab.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/slab.c b/mm/slab.c
index 354a09deecff..b30b58de793b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4461,6 +4461,8 @@ const char *__check_heap_object(const void *ptr, unsigned long n,
 	unsigned int objnr;
 	unsigned long offset;
 
+	ptr = kasan_reset_tag(ptr);
+
 	/* Find and validate object. */
 	cachep = page->slab_cache;
 	objnr = obj_to_index(cachep, page, (void *)ptr);
-- 
2.19.1