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d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=5os4NdBbDONsbLVxABgdrPD9x64VnOptbOzgU3pEDKs=; b=gPshZOUGhi3jTKrgAegXyMayrB3NJm+MU+PvkH/cSrmt2deu56rGog4NQMR6uEZQ0U vutZH/VXP7fulvZdj/S68orwjFmsuDe1meKHIIMnjQh5SjGX5Ia4cxJHCWIZtY/shpKP dol3VfXNz/g931J7CPyvXCs1jRJylpt00Ict8etkaAvFpUa7FLrx1mGhGVEgh4NUKxTC MfxeuUEy6MxZU7Cj1Y1P1WplqwGTrYGVaLrHMOTg9KYTZQi5Aa0DPXWvZokMe4K2dxpX TxFrYCBfxmXyumqs0i6+Z7wmags++nlaPndAusHjwwYGL6AwYOzzVFCJi7SPIIKN93k+ wbOA== X-Gm-Message-State: AOAM530ESxJe+UpW/lNEDGApkVZHjB0szOJF/jiTK3pasUmizSnffqIY Y3zIcf4nBmYhJ8qyBHgQ15+y01fN/22iJB4+ X-Google-Smtp-Source: ABdhPJzR+YEpFc2Ch11Rl6BTXMIoXfaJyZzPai737uCYCgWg2fJznC+a5+pVgD+X3paVHk7gPsjQcrXSotCeIBAj X-Received: from andreyknvl3.muc.corp.google.com ([2a00:79e0:15:13:7220:84ff:fe09:7e9d]) (user=andreyknvl job=sendgmr) by 2002:a0c:c488:: with SMTP id u8mr16899450qvi.9.1612208627196; Mon, 01 Feb 2021 11:43:47 -0800 (PST) Date: Mon, 1 Feb 2021 20:43:27 +0100 In-Reply-To: Message-Id: <8fdbf86842f4eaf2458ecd23d0844058dbc2c7a2.1612208222.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH 03/12] kasan: optimize large kmalloc poisoning From: Andrey Konovalov To: Catalin Marinas , Vincenzo Frascino , Dmitry Vyukov , Alexander Potapenko , Marco Elver Cc: Andrew Morton , Will Deacon , Andrey Ryabinin , Peter Collingbourne , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Similarly to kasan_kmalloc(), kasan_kmalloc_large() doesn't need to unpoison the object as it as already unpoisoned by alloc_pages() (or by ksize() for krealloc()). This patch changes kasan_kmalloc_large() to only poison the redzone. Signed-off-by: Andrey Konovalov Reviewed-by: Marco Elver --- mm/kasan/common.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 128cb330ca73..a7eb553c8e91 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -494,7 +494,6 @@ EXPORT_SYMBOL(__kasan_kmalloc); void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) { - struct page *page; unsigned long redzone_start; unsigned long redzone_end; @@ -504,12 +503,23 @@ void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, if (unlikely(ptr == NULL)) return NULL; - page = virt_to_page(ptr); + /* + * The object has already been unpoisoned by kasan_alloc_pages() for + * alloc_pages() or by ksize() for krealloc(). + */ + + /* + * The redzone has byte-level precision for the generic mode. + * Partially poison the last object granule to cover the unaligned + * part of the redzone. + */ + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + kasan_poison_last_granule(ptr, size); + + /* Poison the aligned part of the redzone. */ redzone_start = round_up((unsigned long)(ptr + size), KASAN_GRANULE_SIZE); - redzone_end = (unsigned long)ptr + page_size(page); - - kasan_unpoison(ptr, size); + redzone_end = (unsigned long)ptr + page_size(virt_to_page(ptr)); kasan_poison((void *)redzone_start, redzone_end - redzone_start, KASAN_PAGE_REDZONE);