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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, andreyknvl@google.com,
	aryabinin@virtuozzo.com, catalin.marinas@arm.com,
	dvyukov@google.com, glider@google.com, leonro@mellanox.com,
	linux-mm@kvack.org, mark.rutland@arm.com,
	mm-commits@vger.kernel.org, naresh.kamboju@linaro.org,
	paulmck@kernel.org, torvalds@linux-foundation.org,
	vincenzo.frascino@arm.com, will@kernel.org
Subject: [patch 15/18] kasan: make addr_has_metadata() return true for valid addresses
Date: Thu, 04 Feb 2021 18:32:53 -0800	[thread overview]
Message-ID: <20210205023253.FkY5Q84ML%akpm@linux-foundation.org> (raw)
In-Reply-To: <20210204183135.e123f0d6027529f2cf500cf2@linux-foundation.org>

From: Vincenzo Frascino <vincenzo.frascino@arm.com>
Subject: kasan: make addr_has_metadata() return true for valid addresses

Currently, addr_has_metadata() returns true for every address.  An invalid
address (e.g.  NULL) passed to the function when, KASAN_HW_TAGS is
enabled, leads to a kernel panic.

Make addr_has_metadata() return true for valid addresses only.

Note: KASAN_HW_TAGS support for vmalloc will be added with a future patch.

Link: https://lkml.kernel.org/r/20210126134409.47894-3-vincenzo.frascino@arm.com
Fixes: 2e903b91479782b7 ("kasan, arm64: implement HW_TAGS runtime")
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Leon Romanovsky <leonro@mellanox.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/kasan/kasan.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/kasan/kasan.h~kasan-make-addr_has_metadata-return-true-for-valid-addresses
+++ a/mm/kasan/kasan.h
@@ -209,7 +209,7 @@ bool check_memory_region(unsigned long a
 
 static inline bool addr_has_metadata(const void *addr)
 {
-	return true;
+	return (is_vmalloc_addr(addr) || virt_addr_valid(addr));
 }
 
 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
_

  parent reply	other threads:[~2021-02-05  2:34 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-05  2:31 incoming Andrew Morton
2021-02-05  2:32 ` [patch 01/18] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page Andrew Morton
2021-02-05  2:32 ` [patch 02/18] mm: hugetlb: fix a race between freeing and dissolving the page Andrew Morton
2021-02-05  2:32 ` [patch 03/18] mm: hugetlb: fix a race between isolating and freeing page Andrew Morton
2021-02-05  2:32 ` [patch 04/18] mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active Andrew Morton
2021-02-05  2:32 ` [patch 05/18] mm: migrate: do not migrate HugeTLB page whose refcount is one Andrew Morton
2021-02-05  2:32 ` [patch 06/18] mm, compaction: move high_pfn to the for loop scope Andrew Morton
2021-02-05  2:32 ` [patch 07/18] mm/vmalloc: separate put pages and flush VM flags Andrew Morton
2021-02-05  2:32 ` [patch 08/18] init/gcov: allow CONFIG_CONSTRUCTORS on UML to fix module gcov Andrew Morton
2021-02-05  2:32 ` [patch 09/18] mm: thp: fix MADV_REMOVE deadlock on shmem THP Andrew Morton
2021-02-05  2:32 ` [patch 10/18] memblock: do not start bottom-up allocations with kernel_end Andrew Morton
2021-02-05  2:32 ` [patch 11/18] mailmap: fix name/email for Viresh Kumar Andrew Morton
2021-02-05  2:32 ` [patch 12/18] mailmap: add entries for Manivannan Sadhasivam Andrew Morton
2021-02-05  2:32 ` [patch 13/18] mm/filemap: add missing mem_cgroup_uncharge() to __add_to_page_cache_locked() Andrew Morton
2021-02-05  2:32 ` [patch 14/18] kasan: add explicit preconditions to kasan_report() Andrew Morton
2021-02-05  2:32 ` Andrew Morton [this message]
2021-02-05  2:32 ` [patch 16/18] ubsan: implement __ubsan_handle_alignment_assumption Andrew Morton
2021-02-05  2:33 ` [patch 17/18] mm: hugetlb: fix missing put_page in gather_surplus_pages() Andrew Morton
2021-02-05  2:33 ` [patch 18/18] MAINTAINERS/.mailmap: use my @kernel.org address Andrew Morton

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