From patchwork Thu Aug 22 07:13:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 13772847 Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2397C149C70; Thu, 22 Aug 2024 07:13:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=93.17.235.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724310826; cv=none; b=L2S6x1At/eLd/bfI1kVuUzj/JuiWTmi3Zn9OXYWpFqPP2mLj5NcgMDXMXvh6YItQlUNx4svePMGoZSC9VHgKdml45fmZH/e1E/PyXOy9TjKuqsQx6VSTR6YkMBDtuQtEWCGp4NsoZye6oX2uI2diCcsYlddIgP+kaVH5h6rR8WY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724310826; c=relaxed/simple; bh=t1ii3oP+DWJaA3RAVE9qv0Jl6VLeHCEWNNWvjxnIH5Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Os7NIaWw54w2Gux/SNHs/MQ46HzLHtlzZlPcJs5vS4rtGvUioEcXeTzvkzEO9Gpgy6R7o84WeKIHHELbrQbOM6jxGK0RxlwuqXc2Ytu1JqqMSdHwYdoiC8sA4mlT8mUgbY7p4Z6OSBJlm4ydEfVZCuQf70E8rw/JdnkKjMmFt+E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=csgroup.eu; spf=pass smtp.mailfrom=csgroup.eu; arc=none smtp.client-ip=93.17.235.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=csgroup.eu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=csgroup.eu Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4WqDv86QrKz9sSN; Thu, 22 Aug 2024 09:13:24 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FdCDskQ2p5WL; Thu, 22 Aug 2024 09:13:24 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4WqDv85QXJz9sSH; Thu, 22 Aug 2024 09:13:24 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id A7ED78B77E; Thu, 22 Aug 2024 09:13:24 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id ouP_vD4wp4xB; Thu, 22 Aug 2024 09:13:24 +0200 (CEST) Received: from PO20335.idsi0.si.c-s.fr (PO16920.IDSI0.si.c-s.fr [192.168.232.181]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 944968B763; Thu, 22 Aug 2024 09:13:23 +0200 (CEST) From: Christophe Leroy To: Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Theodore Ts'o" , "Jason A. Donenfeld" , Arnd Bergmann , Andrew Morton , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Vincenzo Frascino , Shuah Khan Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v2 02/17] vdso: Clean header inclusion in getrandom Date: Thu, 22 Aug 2024 09:13:10 +0200 Message-ID: <2a081f1fff5e40f496153f8e0162fc7ec5adab2e.1724309198.git.christophe.leroy@csgroup.eu> X-Mailer: git-send-email 2.44.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1724310793; l=3539; i=christophe.leroy@csgroup.eu; s=20211009; h=from:subject:message-id; bh=t1ii3oP+DWJaA3RAVE9qv0Jl6VLeHCEWNNWvjxnIH5Q=; b=ANTjekVtAyR0hDVIxrc3nu2T9PxOuN9Ua7Gf4v/suoPDxg/04vzQWBh3+1ksJJaTwPqkpldnx KcQYfaLEwU7BvUlhMxVrCjpvlWYlePU5fPx0kouXgxCqKaovwoxnEp7 X-Developer-Key: i=christophe.leroy@csgroup.eu; a=ed25519; pk=HIzTzUj91asvincQGOFx6+ZF5AoUuP9GdOtQChs7Mm0= Building a VDSO32 on a 64 bits kernel is problematic when some system headers are included. See commit 8c59ab839f52 ("lib/vdso: Enable common headers") for more details. Minimise the amount of headers by moving needed items into dedicated common headers. For PAGE_SIZE and PAGE_MASK, redefine them from CONFIG_PAGE_SHIFT in the same way as commit cffaefd15a8f ("vdso: Use CONFIG_PAGE_SHIFT in vdso/datapage.h") Signed-off-by: Christophe Leroy --- arch/x86/include/asm/pvclock.h | 1 + include/vdso/helpers.h | 1 + lib/vdso/getrandom.c | 15 ++++++++------- 3 files changed, 10 insertions(+), 7 deletions(-) diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index 0c92db84469d..6e4f8fae3ce9 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -5,6 +5,7 @@ #include #include +struct timespec64; /* some helper functions for xen and kvm pv clock sources */ u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); u64 pvclock_clocksource_read_nowd(struct pvclock_vcpu_time_info *src); diff --git a/include/vdso/helpers.h b/include/vdso/helpers.h index 73501149439d..3ddb03bb05cb 100644 --- a/include/vdso/helpers.h +++ b/include/vdso/helpers.h @@ -4,6 +4,7 @@ #ifndef __ASSEMBLY__ +#include #include static __always_inline u32 vdso_read_begin(const struct vdso_data *vd) diff --git a/lib/vdso/getrandom.c b/lib/vdso/getrandom.c index b230f0b10832..cab153c5f9be 100644 --- a/lib/vdso/getrandom.c +++ b/lib/vdso/getrandom.c @@ -3,15 +3,13 @@ * Copyright (C) 2022-2024 Jason A. Donenfeld . All Rights Reserved. */ -#include -#include -#include +#include #include #include +#include #include -#include -#include #include +#include #define MEMCPY_AND_ZERO_SRC(type, dst, src, len) do { \ while (len >= sizeof(type)) { \ @@ -23,6 +21,9 @@ } \ } while (0) +#define _PAGE_SIZE (1UL << CONFIG_PAGE_SHIFT) +#define _PAGE_MASK (~(_PAGE_SIZE - 1)) + static void memcpy_and_zero_src(void *dst, void *src, size_t len) { if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) { @@ -64,7 +65,7 @@ static __always_inline ssize_t __cvdso_getrandom_data(const struct vdso_rng_data *rng_info, void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len) { - ssize_t ret = min_t(size_t, INT_MAX & PAGE_MASK /* = MAX_RW_COUNT */, len); + ssize_t ret = min_t(size_t, INT_MAX & _PAGE_MASK /* = MAX_RW_COUNT */, len); struct vgetrandom_state *state = opaque_state; size_t batch_len, nblocks, orig_len = len; bool in_use, have_retried = false; @@ -82,7 +83,7 @@ __cvdso_getrandom_data(const struct vdso_rng_data *rng_info, void *buffer, size_ } /* The state must not straddle a page, since pages can be zeroed at any time. */ - if (unlikely(((unsigned long)opaque_state & ~PAGE_MASK) + sizeof(*state) > PAGE_SIZE)) + if (unlikely(((unsigned long)opaque_state & ~_PAGE_MASK) + sizeof(*state) > _PAGE_SIZE)) return -EFAULT; /* If the caller passes the wrong size, which might happen due to CRIU, fallback. */