From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7D996343D86; Fri, 12 Jun 2026 04:45:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781239502; cv=none; b=rVCjOB+cLA7drmnhCr28xP83yE+lvIksy69hhxfClygw0Cs+0LWLD+4yCKoBvA5gUzeRqVP9QueinbtB1NMmP07Det+icrOxFokWsbTW7VuYikkjdbhaj9D6l3y+sj8SGibn9SnDXSeuBWe3BMKl/YRCmHSz5D4n4dHhWjmAq3E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781239502; c=relaxed/simple; bh=b00TklBGecqQHLra7PJTRi5mE5kXZpjh3sOy2Gf7YPQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PLR7Qih1TCw8vo3/FKeC0jCRcqhBpr03B/PoQGbFJFZvc7252kvMyRC59Dui2QY3EcnJ1XCKwcSj39Let1SOK3KGZx2WPEk9kPUBKVbSt/FwA/uPZ46iesGEUAhiJmV2FXeGGDBUlti+gIne528IMnC4JQBs4R/cyRZwXH8548Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=Q+ywobdJ; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="Q+ywobdJ" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1C26E2E91; Thu, 11 Jun 2026 21:44:55 -0700 (PDT) Received: from cesw-amp-gbt-1s-m12830-01.blr.arm.com (cesw-amp-gbt-1s-m12830-01.blr.arm.com [10.164.195.31]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 2BAF13FAF5; Thu, 11 Jun 2026 21:44:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1781239499; bh=b00TklBGecqQHLra7PJTRi5mE5kXZpjh3sOy2Gf7YPQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q+ywobdJtIBtiIj1Lm87NJAvMg5U5ZyPO3GOiZE5j7oUMWa2LPjn5dzWP/UcvIfsR eAIppw1XHah98pdVj9WRrylHYixsfy899jM7BhUXauI0syxEiAplt27uUuk/UZ4Tct 1rn0H7QLZBrriUcOjns9J7XKs7UrCuhBG1BRs4Wk= From: Dev Jain To: ryabinin.a.a@gmail.com, akpm@linux-foundation.org, corbet@lwn.net Cc: Dev Jain , glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, ryan.roberts@arm.com, anshuman.khandual@arm.com, kaleshsingh@google.com, 21cnbao@gmail.com, david@kernel.org, will@kernel.org, catalin.marinas@arm.com Subject: [RFC PATCH 1/2] kasan: hw_tags: Use KASAN_PAGE_REDZONE for vmalloc redzoning Date: Fri, 12 Jun 2026 04:44:23 +0000 Message-ID: <20260612044425.763060-2-dev.jain@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260612044425.763060-1-dev.jain@arm.com> References: <20260612044425.763060-1-dev.jain@arm.com> Precedence: bulk X-Mailing-List: workflows@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In preparation for adding "tag only on alloc" boot time option, use KASAN_PAGE_REDZONE instead of KASAN_TAG_INVALID for poisoning the tail end of the vmalloc allocation. Although both values are the same for hw tags, KASAN_SLAB_REDZONE is used for poisoning the tail end of a kmalloc object allocation, so maintain the pattern. Signed-off-by: Dev Jain --- mm/kasan/hw_tags.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c index cbef5e450954e..c1a2b48808ed7 100644 --- a/mm/kasan/hw_tags.c +++ b/mm/kasan/hw_tags.c @@ -375,7 +375,7 @@ void *__kasan_unpoison_vmalloc(const void *start, unsigned long size, redzone_start = round_up((unsigned long)start + size, KASAN_GRANULE_SIZE); redzone_size = round_up(redzone_start, PAGE_SIZE) - redzone_start; - kasan_poison((void *)redzone_start, redzone_size, KASAN_TAG_INVALID, + kasan_poison((void *)redzone_start, redzone_size, KASAN_PAGE_REDZONE, flags & KASAN_VMALLOC_INIT); /* -- 2.43.0