From patchwork Wed Feb 16 13:13:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12748513 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60CBFC433F5 for ; Wed, 16 Feb 2022 13:17:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233880AbiBPNRP (ORCPT ); Wed, 16 Feb 2022 08:17:15 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:34650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233877AbiBPNRF (ORCPT ); Wed, 16 Feb 2022 08:17:05 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AACC47669; Wed, 16 Feb 2022 05:16:36 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 5FD56CE26F5; Wed, 16 Feb 2022 13:16:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 214BAC36AE7; Wed, 16 Feb 2022 13:16:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645017393; bh=lx487dro4zL/zPL193Oy6nweU7A4WVV+sN3sqinseG4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=omMDrhEPLws0kx3FaJdMKyiFQbfwIcb5C7tofQAI2lXuZWrTiTUwDFHKrcpaJ13Ok NsykM6tJoZvXy9HpScnzw03vekziZH4+cmNWuN8sFx6q+kht1g72i5yzFbnCgaADFX 3buM3JcSdiMZxvMTvsPMSDWKxY3LFEssTkxEvrPD9rYjO0WAcv/PY2WS7xtaDGc4wy DxYAh6OJOKM+eKboklR6CEThuRYhYEyLLFqlkJ2zwQTnKoB+HomGSt++/CH7kJczaj yZMo0S4/Pd73o6yZAoHMI5U6kMVwrUt/QgHtW6Ao2qPNSByCOZz+CMYBy1uC+ywZu0 EVn+6B86qN3Bg== From: Arnd Bergmann To: Linus Torvalds , Christoph Hellwig , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk Cc: linux@armlinux.org.uk, will@kernel.org, guoren@kernel.org, bcain@codeaurora.org, geert@linux-m68k.org, monstr@monstr.eu, tsbogend@alpha.franken.de, nickhu@andestech.com, green.hu@gmail.com, dinguyen@kernel.org, shorne@gmail.com, deller@gmx.de, mpe@ellerman.id.au, peterz@infradead.org, mingo@redhat.com, mark.rutland@arm.com, hca@linux.ibm.com, dalias@libc.org, davem@davemloft.net, richard@nod.at, x86@kernel.org, jcmvbkbc@gmail.com, ebiederm@xmission.com, akpm@linux-foundation.org, ardb@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, Christoph Hellwig Subject: [PATCH v2 05/18] x86: remove __range_not_ok() Date: Wed, 16 Feb 2022 14:13:19 +0100 Message-Id: <20220216131332.1489939-6-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20220216131332.1489939-1-arnd@kernel.org> References: <20220216131332.1489939-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org From: Arnd Bergmann The __range_not_ok() helper is an x86 (and sparc64) specific interface that does roughly the same thing as __access_ok(), but with different calling conventions. Change this to use the normal interface in order for consistency as we clean up all access_ok() implementations. This changes the limit from TASK_SIZE to TASK_SIZE_MAX, which Al points out is the right thing do do here anyway. The callers have to use __access_ok() instead of the normal access_ok() though, because on x86 that contains a WARN_ON_IN_IRQ() check that cannot be used inside of NMI context while tracing. Suggested-by: Al Viro Suggested-by: Christoph Hellwig Link: https://lore.kernel.org/lkml/YgsUKcXGR7r4nINj@zeniv-ca.linux.org.uk/ Signed-off-by: Arnd Bergmann --- arch/x86/events/core.c | 2 +- arch/x86/include/asm/uaccess.h | 10 ++++++---- arch/x86/kernel/dumpstack.c | 2 +- arch/x86/kernel/stacktrace.c | 2 +- arch/x86/lib/usercopy.c | 2 +- 5 files changed, 10 insertions(+), 8 deletions(-) diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index e686c5e0537b..eef816fc216d 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2794,7 +2794,7 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re static inline int valid_user_frame(const void __user *fp, unsigned long size) { - return (__range_not_ok(fp, size, TASK_SIZE) == 0); + return __access_ok(fp, size); } static unsigned long get_segment_base(unsigned int segment) diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index ac96f9b2d64b..79c4869ccdd6 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -16,8 +16,10 @@ * Test whether a block of memory is a valid user space address. * Returns 0 if the range is valid, nonzero otherwise. */ -static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit) +static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size) { + unsigned long limit = TASK_SIZE_MAX; + /* * If we have used "sizeof()" for the size, * we know it won't overflow the limit (but @@ -35,10 +37,10 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un return unlikely(addr > limit); } -#define __range_not_ok(addr, size, limit) \ +#define __access_ok(addr, size) \ ({ \ __chk_user_ptr(addr); \ - __chk_range_not_ok((unsigned long __force)(addr), size, limit); \ + !__chk_range_not_ok((unsigned long __force)(addr), size); \ }) #ifdef CONFIG_DEBUG_ATOMIC_SLEEP @@ -69,7 +71,7 @@ static inline bool pagefault_disabled(void); #define access_ok(addr, size) \ ({ \ WARN_ON_IN_IRQ(); \ - likely(!__range_not_ok(addr, size, TASK_SIZE_MAX)); \ + likely(__access_ok(addr, size)); \ }) extern int __get_user_1(void); diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 53de044e5654..da534fb7b5c6 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -85,7 +85,7 @@ static int copy_code(struct pt_regs *regs, u8 *buf, unsigned long src, * Make sure userspace isn't trying to trick us into dumping kernel * memory by pointing the userspace instruction pointer at it. */ - if (__chk_range_not_ok(src, nbytes, TASK_SIZE_MAX)) + if (!__access_ok((void __user *)src, nbytes)) return -EINVAL; /* diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 15b058eefc4e..ee117fcf46ed 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -90,7 +90,7 @@ copy_stack_frame(const struct stack_frame_user __user *fp, { int ret; - if (__range_not_ok(fp, sizeof(*frame), TASK_SIZE)) + if (!__access_ok(fp, sizeof(*frame))) return 0; ret = 1; diff --git a/arch/x86/lib/usercopy.c b/arch/x86/lib/usercopy.c index c3e8a62ca561..ad0139d25401 100644 --- a/arch/x86/lib/usercopy.c +++ b/arch/x86/lib/usercopy.c @@ -32,7 +32,7 @@ copy_from_user_nmi(void *to, const void __user *from, unsigned long n) { unsigned long ret; - if (__range_not_ok(from, n, TASK_SIZE)) + if (!__access_ok(from, n)) return n; if (!nmi_uaccess_okay())