From patchwork Tue Jul 27 14:48:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12403013 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B3F7C4338F for ; Tue, 27 Jul 2021 14:50:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5DDBC619F8 for ; Tue, 27 Jul 2021 14:50:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232470AbhG0Ouq (ORCPT ); Tue, 27 Jul 2021 10:50:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:36020 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236881AbhG0Ott (ORCPT ); Tue, 27 Jul 2021 10:49:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 190B261AFF; Tue, 27 Jul 2021 14:49:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627397365; bh=czPyPIxu2PTKCugBK9YtQzlToUphKkxEXLs4PNmX7jg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S5U4Sw6RZr+k+Bx+qsSik83rWJ1gJ3J+Xnjocua3sMYzOKHbVYjQfC9+EelM8p+bs 4yYTcFQ7ggj7/9L/nDbgjY7ayt505P/zljlokLVPofqFMQrEvNVfoW9HMuU4TqA0Co TdN+v3mbVV1heJZaRF5cU7QERPA97113HBKPcg2JvNFknquwsyW9tlVacdjnIMqXSX giQafSwRthQmNq0eRh7VJskmn2tjqTQ0Upx5ScJFTxOr6ZLAaYFUTQjrmyn933A70S 74C6f/8vRnm4eN8EXBJeJORsy9hMmPFHVQgiyP9SqQifHV6cf8WoTCKh6RQ+RTwTdh dqfKPOvYSQEWw== From: Arnd Bergmann To: Andrew Morton Cc: Arnd Bergmann , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S. Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Al Viro , "Eric W. Biederman" , Christoph Hellwig , Feng Tang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v5 1/6] kexec: move locking into do_kexec_load Date: Tue, 27 Jul 2021 16:48:54 +0200 Message-Id: <20210727144859.4150043-2-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210727144859.4150043-1-arnd@kernel.org> References: <20210727144859.4150043-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Arnd Bergmann The locking is the same between the native and compat version of sys_kexec_load(), so it can be done in the common implementation to reduce duplication. Co-developed-by: Eric Biederman Co-developed-by: Christoph Hellwig Signed-off-by: Arnd Bergmann Acked-by: "Eric W. Biederman" --- kernel/kexec.c | 44 ++++++++++++++++---------------------------- 1 file changed, 16 insertions(+), 28 deletions(-) diff --git a/kernel/kexec.c b/kernel/kexec.c index c82c6c06f051..9c7aef8f4bb6 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -110,6 +110,17 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments, unsigned long i; int ret; + /* + * Because we write directly to the reserved memory region when loading + * crash kernels we need a mutex here to prevent multiple crash kernels + * from attempting to load simultaneously, and to prevent a crash kernel + * from loading over the top of a in use crash kernel. + * + * KISS: always take the mutex. + */ + if (!mutex_trylock(&kexec_mutex)) + return -EBUSY; + if (flags & KEXEC_ON_CRASH) { dest_image = &kexec_crash_image; if (kexec_crash_image) @@ -121,7 +132,8 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments, if (nr_segments == 0) { /* Uninstall image */ kimage_free(xchg(dest_image, NULL)); - return 0; + ret = 0; + goto out_unlock; } if (flags & KEXEC_ON_CRASH) { /* @@ -134,7 +146,7 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments, ret = kimage_alloc_init(&image, entry, nr_segments, segments, flags); if (ret) - return ret; + goto out_unlock; if (flags & KEXEC_PRESERVE_CONTEXT) image->preserve_context = 1; @@ -171,6 +183,8 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments, arch_kexec_protect_crashkres(); kimage_free(image); +out_unlock: + mutex_unlock(&kexec_mutex); return ret; } @@ -247,21 +261,8 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT)) return -EINVAL; - /* Because we write directly to the reserved memory - * region when loading crash kernels we need a mutex here to - * prevent multiple crash kernels from attempting to load - * simultaneously, and to prevent a crash kernel from loading - * over the top of a in use crash kernel. - * - * KISS: always take the mutex. - */ - if (!mutex_trylock(&kexec_mutex)) - return -EBUSY; - result = do_kexec_load(entry, nr_segments, segments, flags); - mutex_unlock(&kexec_mutex); - return result; } @@ -301,21 +302,8 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry, return -EFAULT; } - /* Because we write directly to the reserved memory - * region when loading crash kernels we need a mutex here to - * prevent multiple crash kernels from attempting to load - * simultaneously, and to prevent a crash kernel from loading - * over the top of a in use crash kernel. - * - * KISS: always take the mutex. - */ - if (!mutex_trylock(&kexec_mutex)) - return -EBUSY; - result = do_kexec_load(entry, nr_segments, ksegments, flags); - mutex_unlock(&kexec_mutex); - return result; } #endif From patchwork Tue Jul 27 14:48:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12403025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 202FDC25AE5 for ; Tue, 27 Jul 2021 14:51:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0326661A7F for ; Tue, 27 Jul 2021 14:51:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236968AbhG0Ous (ORCPT ); Tue, 27 Jul 2021 10:50:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:36102 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236909AbhG0Ott (ORCPT ); Tue, 27 Jul 2021 10:49:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id F238F61B05; Tue, 27 Jul 2021 14:49:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627397371; bh=uEwQ9C0cLg3IwMIORY/37dlh5O4fu4jNkU/FjsRvIrE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kj/IVvXy3JHWkqM0XFNYDPQdxSxj8JggLNuER9Hto8/iywRcIWO4ntU+1XOU+vznN nwEKRsA+VKIKup4+NtVyRDYRpls5U2TXGCwqj3BJNmiv5sKmAucefRYvBWnZGg/gWZ c82xtneZYpDFHr8DZcbROOlVG3lPysp9nfW3etc11bBGulX+P5auZXokAklC34LE09 zwwS/wKlWBr3BJYnxmJQmo/nNvm9893oVZ0YfCEUg2WJgjbqKzN5nBIr50IymV9mHv xGRSVKAvWuWMXXuS4LWxtdDEitvbuLrJU8AGGYaPMslKu0GUWYCUOcXlo8lTk6GhMM d1I9fnI2UDWGQ== From: Arnd Bergmann To: Andrew Morton Cc: Arnd Bergmann , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S. Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Al Viro , "Eric W. Biederman" , Christoph Hellwig , Feng Tang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v5 2/6] kexec: avoid compat_alloc_user_space Date: Tue, 27 Jul 2021 16:48:55 +0200 Message-Id: <20210727144859.4150043-3-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210727144859.4150043-1-arnd@kernel.org> References: <20210727144859.4150043-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Arnd Bergmann kimage_alloc_init() expects a __user pointer, so compat_sys_kexec_load() uses compat_alloc_user_space() to convert the layout and put it back onto the user space caller stack. Moving the user space access into the syscall handler directly actually makes the code simpler, as the conversion for compat mode can now be done on kernel memory. Co-developed-by: Eric Biederman Co-developed-by: Christoph Hellwig Link: https://lore.kernel.org/lkml/YPbtsU4GX6PL7%2F42@infradead.org/ Link: https://lore.kernel.org/lkml/m1y2cbzmnw.fsf@fess.ebiederm.org/ Signed-off-by: Arnd Bergmann Acked-by: "Eric W. Biederman" --- kernel/kexec.c | 61 +++++++++++++++++++++----------------------------- 1 file changed, 25 insertions(+), 36 deletions(-) diff --git a/kernel/kexec.c b/kernel/kexec.c index 9c7aef8f4bb6..b5e40f069768 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -19,26 +19,9 @@ #include "kexec_internal.h" -static int copy_user_segment_list(struct kimage *image, - unsigned long nr_segments, - struct kexec_segment __user *segments) -{ - int ret; - size_t segment_bytes; - - /* Read in the segments */ - image->nr_segments = nr_segments; - segment_bytes = nr_segments * sizeof(*segments); - ret = copy_from_user(image->segment, segments, segment_bytes); - if (ret) - ret = -EFAULT; - - return ret; -} - static int kimage_alloc_init(struct kimage **rimage, unsigned long entry, unsigned long nr_segments, - struct kexec_segment __user *segments, + struct kexec_segment *segments, unsigned long flags) { int ret; @@ -58,10 +41,8 @@ static int kimage_alloc_init(struct kimage **rimage, unsigned long entry, return -ENOMEM; image->start = entry; - - ret = copy_user_segment_list(image, nr_segments, segments); - if (ret) - goto out_free_image; + image->nr_segments = nr_segments; + memcpy(image->segment, segments, nr_segments * sizeof(*segments)); if (kexec_on_panic) { /* Enable special crash kernel control page alloc policy. */ @@ -104,7 +85,7 @@ static int kimage_alloc_init(struct kimage **rimage, unsigned long entry, } static int do_kexec_load(unsigned long entry, unsigned long nr_segments, - struct kexec_segment __user *segments, unsigned long flags) + struct kexec_segment *segments, unsigned long flags) { struct kimage **dest_image, *image; unsigned long i; @@ -250,7 +231,8 @@ static inline int kexec_load_check(unsigned long nr_segments, SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, struct kexec_segment __user *, segments, unsigned long, flags) { - int result; + struct kexec_segment *ksegments; + unsigned long result; result = kexec_load_check(nr_segments, flags); if (result) @@ -261,7 +243,12 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT)) return -EINVAL; - result = do_kexec_load(entry, nr_segments, segments, flags); + ksegments = memdup_user(segments, nr_segments * sizeof(ksegments[0])); + if (IS_ERR(ksegments)) + return PTR_ERR(ksegments); + + result = do_kexec_load(entry, nr_segments, ksegments, flags); + kfree(ksegments); return result; } @@ -273,7 +260,7 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry, compat_ulong_t, flags) { struct compat_kexec_segment in; - struct kexec_segment out, __user *ksegments; + struct kexec_segment *ksegments; unsigned long i, result; result = kexec_load_check(nr_segments, flags); @@ -286,24 +273,26 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry, if ((flags & KEXEC_ARCH_MASK) == KEXEC_ARCH_DEFAULT) return -EINVAL; - ksegments = compat_alloc_user_space(nr_segments * sizeof(out)); + ksegments = kmalloc_array(nr_segments, sizeof(ksegments[0]), + GFP_KERNEL); + if (!ksegments) + return -ENOMEM; + for (i = 0; i < nr_segments; i++) { result = copy_from_user(&in, &segments[i], sizeof(in)); if (result) - return -EFAULT; + goto fail; - out.buf = compat_ptr(in.buf); - out.bufsz = in.bufsz; - out.mem = in.mem; - out.memsz = in.memsz; - - result = copy_to_user(&ksegments[i], &out, sizeof(out)); - if (result) - return -EFAULT; + ksegments[i].buf = compat_ptr(in.buf); + ksegments[i].bufsz = in.bufsz; + ksegments[i].mem = in.mem; + ksegments[i].memsz = in.memsz; } result = do_kexec_load(entry, nr_segments, ksegments, flags); +fail: + kfree(ksegments); return result; } #endif From patchwork Tue Jul 27 14:48:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12403017 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3BDAC19F38 for ; Tue, 27 Jul 2021 14:50:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BFFBB61AF7 for ; Tue, 27 Jul 2021 14:50:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236855AbhG0Ou4 (ORCPT ); Tue, 27 Jul 2021 10:50:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:36248 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236916AbhG0Ott (ORCPT ); Tue, 27 Jul 2021 10:49:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D161461B00; Tue, 27 Jul 2021 14:49:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627397377; bh=waF0yGZ/74FCKFwfsSHiFG6HeMntkph0RFHmK2X6nWk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XenONNoSK2cLncTqqJgIRWkdacJuUk3tCFtmqztNrzRf62E+2ZdCK0GnSIsIu+dlv qcGEi/Iz+oPD42JhJdKaGksnfmuNWft0N/+iDUWeJ7rsoW+OWZ/k6dWpnQNBt8+kwz dexqr+/4ut9vd2esm0RkG/KrcnY4zQzJKKhBn/yKPmH2x9fmtb66Xptq19HxJPEV88 wP2JALUBp2AhG0A5obwSEHOqw/gKNp57a1ov3O6nCYs5EhuqCiqke2DVgzbogxYnQ6 nDvN8P5s3b6EsJxE0INjFM3F2whAxtmFr66NDXEk2sJaVnRy/+I3N2hf+RsC784t9S 6SVvPCVxy9a/w== From: Arnd Bergmann To: Andrew Morton Cc: Arnd Bergmann , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S. Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Al Viro , "Eric W. Biederman" , Christoph Hellwig , Feng Tang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig Subject: [PATCH v5 3/6] mm: simplify compat_sys_move_pages Date: Tue, 27 Jul 2021 16:48:56 +0200 Message-Id: <20210727144859.4150043-4-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210727144859.4150043-1-arnd@kernel.org> References: <20210727144859.4150043-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Arnd Bergmann The compat move_pages() implementation uses compat_alloc_user_space() for converting the pointer array. Moving the compat handling into the function itself is a bit simpler and lets us avoid the compat_alloc_user_space() call. Reviewed-by: Christoph Hellwig Signed-off-by: Arnd Bergmann --- mm/migrate.c | 45 ++++++++++++++++++++++++++++++--------------- 1 file changed, 30 insertions(+), 15 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index 34a9ad3e0a4f..60634d2653b9 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1820,6 +1820,23 @@ static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages, mmap_read_unlock(mm); } +static int get_compat_pages_array(const void __user *chunk_pages[], + const void __user * __user *pages, + unsigned long chunk_nr) +{ + compat_uptr_t __user *pages32 = (compat_uptr_t __user *)pages; + compat_uptr_t p; + int i; + + for (i = 0; i < chunk_nr; i++) { + if (get_user(p, pages32 + i)) + return -EFAULT; + chunk_pages[i] = compat_ptr(p); + } + + return 0; +} + /* * Determine the nodes of a user array of pages and store it in * a user array of status. @@ -1839,8 +1856,15 @@ static int do_pages_stat(struct mm_struct *mm, unsigned long nr_pages, if (chunk_nr > DO_PAGES_STAT_CHUNK_NR) chunk_nr = DO_PAGES_STAT_CHUNK_NR; - if (copy_from_user(chunk_pages, pages, chunk_nr * sizeof(*chunk_pages))) - break; + if (in_compat_syscall()) { + if (get_compat_pages_array(chunk_pages, pages, + chunk_nr)) + break; + } else { + if (copy_from_user(chunk_pages, pages, + chunk_nr * sizeof(*chunk_pages))) + break; + } do_pages_stat_array(mm, chunk_nr, chunk_pages, chunk_status); @@ -1945,23 +1969,14 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, - compat_uptr_t __user *, pages32, + compat_uptr_t __user *, pages, const int __user *, nodes, int __user *, status, int, flags) { - const void __user * __user *pages; - int i; - - pages = compat_alloc_user_space(nr_pages * sizeof(void *)); - for (i = 0; i < nr_pages; i++) { - compat_uptr_t p; - - if (get_user(p, pages32 + i) || - put_user(compat_ptr(p), pages + i)) - return -EFAULT; - } - return kernel_move_pages(pid, nr_pages, pages, nodes, status, flags); + return kernel_move_pages(pid, nr_pages, + (const void __user *__user *)pages, + nodes, status, flags); } #endif /* CONFIG_COMPAT */ From patchwork Tue Jul 27 14:48:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12403023 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0F28C19F3E for ; Tue, 27 Jul 2021 14:51:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C0C561B04 for ; Tue, 27 Jul 2021 14:51:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237209AbhG0Ou7 (ORCPT ); Tue, 27 Jul 2021 10:50:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:36536 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236975AbhG0Otz (ORCPT ); Tue, 27 Jul 2021 10:49:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D9E2F61B1D; Tue, 27 Jul 2021 14:49:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627397383; bh=dPlYDstFTxk7KvXXSkILqtki5oTr7BN9WPbKn/8kEtM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bZ6SiXuwV201vvaDIV2Ua5zgTNHmbQ50GceUzNEOVnFQmjvQBjX5dzQtyK4Tl7xs5 7zDao+S8i4xpU7F2i4Cj3MoaxUvAqPyueMDk7tEWKRGJ2fruXb4OI+dC69QDO3sDjF p+7JadXON5ZaVQoIImfxjNgsP784PBt+6o4VOkBByDbh3iYSdRUfDswFq3OpdOBvEg iz9U0zHNQWsQmDUBeNSLb9zz3VS4WV20Ff4FKvy3cvlkGoXcNON60t/mTyIo/fF5kb dyc2rLUW4CnwqFSUrYoHMtlNL6KSXRo1J0G17Od1Fgw29s4tO7lgN4BRWZjKwPlHPL pEwIDZj5r/0XA== From: Arnd Bergmann To: Andrew Morton Cc: Arnd Bergmann , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S. Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Al Viro , "Eric W. Biederman" , Christoph Hellwig , Feng Tang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig Subject: [PATCH v5 4/6] mm: simplify compat numa syscalls Date: Tue, 27 Jul 2021 16:48:57 +0200 Message-Id: <20210727144859.4150043-5-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210727144859.4150043-1-arnd@kernel.org> References: <20210727144859.4150043-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Arnd Bergmann The compat implementations for mbind, get_mempolicy, set_mempolicy and migrate_pages are just there to handle the subtly different layout of bitmaps on 32-bit hosts. The compat implementation however lacks some of the checks that are present in the native one, in particular for checking that the extra bits are all zero when user space has a larger mask size than the kernel. Worse, those extra bits do not get cleared when copying in or out of the kernel, which can lead to incorrect data as well. Unify the implementation to handle the compat bitmap layout directly in the get_nodes() and copy_nodes_to_user() helpers. Splitting out the get_bitmap() helper from get_nodes() also helps readability of the native case. On x86, two additional problems are addressed by this: compat tasks can pass a bitmap at the end of a mapping, causing a fault when reading across the page boundary for a 64-bit word. x32 tasks might also run into problems with get_mempolicy corrupting data when an odd number of 32-bit words gets passed. On parisc the migrate_pages() system call apparently had the wrong calling convention, as big-endian architectures expect the words inside of a bitmap to be swapped. This is not a problem though since parisc has no NUMA support. Reviewed-by: Christoph Hellwig Signed-off-by: Arnd Bergmann --- include/linux/compat.h | 17 ++-- mm/mempolicy.c | 175 +++++++++++++---------------------------- 2 files changed, 63 insertions(+), 129 deletions(-) diff --git a/include/linux/compat.h b/include/linux/compat.h index 8e0598c7d1d1..3a2ac5afee30 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -395,14 +395,6 @@ struct compat_kexec_segment; struct compat_mq_attr; struct compat_msgbuf; -#define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t)) - -#define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG) - -long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, - unsigned long bitmap_size); -long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, - unsigned long bitmap_size); void copy_siginfo_to_external32(struct compat_siginfo *to, const struct kernel_siginfo *from); int copy_siginfo_from_user32(kernel_siginfo_t *to, @@ -976,6 +968,15 @@ static inline bool in_compat_syscall(void) { return false; } #endif /* CONFIG_COMPAT */ +#define BITS_PER_COMPAT_LONG (8*sizeof(compat_long_t)) + +#define BITS_TO_COMPAT_LONGS(bits) DIV_ROUND_UP(bits, BITS_PER_COMPAT_LONG) + +long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, + unsigned long bitmap_size); +long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, + unsigned long bitmap_size); + /* * Some legacy ABIs like the i386 one use less than natural alignment for 64-bit * types, and will need special compat treatment for that. Most architectures diff --git a/mm/mempolicy.c b/mm/mempolicy.c index e32360e90274..9bc5dabdb7a7 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1362,16 +1362,33 @@ static long do_mbind(unsigned long start, unsigned long len, /* * User space interface with variable sized bitmaps for nodelists. */ +static int get_bitmap(unsigned long *mask, const unsigned long __user *nmask, + unsigned long maxnode) +{ + unsigned long nlongs = BITS_TO_LONGS(maxnode); + int ret; + + if (in_compat_syscall()) + ret = compat_get_bitmap(mask, + (const compat_ulong_t __user *)nmask, + maxnode); + else + ret = copy_from_user(mask, nmask, + nlongs * sizeof(unsigned long)); + + if (ret) + return -EFAULT; + + if (maxnode % BITS_PER_LONG) + mask[nlongs - 1] &= (1UL << (maxnode % BITS_PER_LONG)) - 1; + + return 0; +} /* Copy a node mask from user space. */ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, unsigned long maxnode) { - unsigned long k; - unsigned long t; - unsigned long nlongs; - unsigned long endmask; - --maxnode; nodes_clear(*nodes); if (maxnode == 0 || !nmask) @@ -1379,49 +1396,29 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, if (maxnode > PAGE_SIZE*BITS_PER_BYTE) return -EINVAL; - nlongs = BITS_TO_LONGS(maxnode); - if ((maxnode % BITS_PER_LONG) == 0) - endmask = ~0UL; - else - endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; - /* * When the user specified more nodes than supported just check - * if the non supported part is all zero. - * - * If maxnode have more longs than MAX_NUMNODES, check - * the bits in that area first. And then go through to - * check the rest bits which equal or bigger than MAX_NUMNODES. - * Otherwise, just check bits [MAX_NUMNODES, maxnode). + * if the non supported part is all zero, one word at a time, + * starting at the end. */ - if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { - for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { - if (get_user(t, nmask + k)) - return -EFAULT; - if (k == nlongs - 1) { - if (t & endmask) - return -EINVAL; - } else if (t) - return -EINVAL; - } - nlongs = BITS_TO_LONGS(MAX_NUMNODES); - endmask = ~0UL; - } + while (maxnode > MAX_NUMNODES) { + unsigned long bits = min_t(unsigned long, maxnode, BITS_PER_LONG); + unsigned long t; - if (maxnode > MAX_NUMNODES && MAX_NUMNODES % BITS_PER_LONG != 0) { - unsigned long valid_mask = endmask; - - valid_mask &= ~((1UL << (MAX_NUMNODES % BITS_PER_LONG)) - 1); - if (get_user(t, nmask + nlongs - 1)) + if (get_bitmap(&t, &nmask[maxnode / BITS_PER_LONG], bits)) return -EFAULT; - if (t & valid_mask) + + if (maxnode - bits >= MAX_NUMNODES) { + maxnode -= bits; + } else { + maxnode = MAX_NUMNODES; + t &= ~((1UL << (MAX_NUMNODES % BITS_PER_LONG)) - 1); + } + if (t) return -EINVAL; } - if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) - return -EFAULT; - nodes_addr(*nodes)[nlongs-1] &= endmask; - return 0; + return get_bitmap(nodes_addr(*nodes), nmask, maxnode); } /* Copy a kernel node mask to user space */ @@ -1430,6 +1427,10 @@ static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, { unsigned long copy = ALIGN(maxnode-1, 64) / 8; unsigned int nbytes = BITS_TO_LONGS(nr_node_ids) * sizeof(long); + bool compat = in_compat_syscall(); + + if (compat) + nbytes = BITS_TO_COMPAT_LONGS(nr_node_ids) * sizeof(compat_long_t); if (copy > nbytes) { if (copy > PAGE_SIZE) @@ -1438,6 +1439,11 @@ static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, return -EFAULT; copy = nbytes; } + + if (compat) + return compat_put_bitmap((compat_ulong_t __user *)mask, + nodes_addr(*nodes), maxnode); + return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; } @@ -1648,72 +1654,22 @@ COMPAT_SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, compat_ulong_t, maxnode, compat_ulong_t, addr, compat_ulong_t, flags) { - long err; - unsigned long __user *nm = NULL; - unsigned long nr_bits, alloc_size; - DECLARE_BITMAP(bm, MAX_NUMNODES); - - nr_bits = min_t(unsigned long, maxnode-1, nr_node_ids); - alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; - - if (nmask) - nm = compat_alloc_user_space(alloc_size); - - err = kernel_get_mempolicy(policy, nm, nr_bits+1, addr, flags); - - if (!err && nmask) { - unsigned long copy_size; - copy_size = min_t(unsigned long, sizeof(bm), alloc_size); - err = copy_from_user(bm, nm, copy_size); - /* ensure entire bitmap is zeroed */ - err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); - err |= compat_put_bitmap(nmask, bm, nr_bits); - } - - return err; + return kernel_get_mempolicy(policy, (unsigned long __user *)nmask, + maxnode, addr, flags); } COMPAT_SYSCALL_DEFINE3(set_mempolicy, int, mode, compat_ulong_t __user *, nmask, compat_ulong_t, maxnode) { - unsigned long __user *nm = NULL; - unsigned long nr_bits, alloc_size; - DECLARE_BITMAP(bm, MAX_NUMNODES); - - nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); - alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; - - if (nmask) { - if (compat_get_bitmap(bm, nmask, nr_bits)) - return -EFAULT; - nm = compat_alloc_user_space(alloc_size); - if (copy_to_user(nm, bm, alloc_size)) - return -EFAULT; - } - - return kernel_set_mempolicy(mode, nm, nr_bits+1); + return kernel_set_mempolicy(mode, (unsigned long __user *)nmask, maxnode); } COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len, compat_ulong_t, mode, compat_ulong_t __user *, nmask, compat_ulong_t, maxnode, compat_ulong_t, flags) { - unsigned long __user *nm = NULL; - unsigned long nr_bits, alloc_size; - nodemask_t bm; - - nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); - alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; - - if (nmask) { - if (compat_get_bitmap(nodes_addr(bm), nmask, nr_bits)) - return -EFAULT; - nm = compat_alloc_user_space(alloc_size); - if (copy_to_user(nm, nodes_addr(bm), alloc_size)) - return -EFAULT; - } - - return kernel_mbind(start, len, mode, nm, nr_bits+1, flags); + return kernel_mbind(start, len, mode, (unsigned long __user *)nmask, + maxnode, flags); } COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, @@ -1721,32 +1677,9 @@ COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, const compat_ulong_t __user *, old_nodes, const compat_ulong_t __user *, new_nodes) { - unsigned long __user *old = NULL; - unsigned long __user *new = NULL; - nodemask_t tmp_mask; - unsigned long nr_bits; - unsigned long size; - - nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); - size = ALIGN(nr_bits, BITS_PER_LONG) / 8; - if (old_nodes) { - if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) - return -EFAULT; - old = compat_alloc_user_space(new_nodes ? size * 2 : size); - if (new_nodes) - new = old + size / sizeof(unsigned long); - if (copy_to_user(old, nodes_addr(tmp_mask), size)) - return -EFAULT; - } - if (new_nodes) { - if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) - return -EFAULT; - if (new == NULL) - new = compat_alloc_user_space(size); - if (copy_to_user(new, nodes_addr(tmp_mask), size)) - return -EFAULT; - } - return kernel_migrate_pages(pid, nr_bits + 1, old, new); + return kernel_migrate_pages(pid, maxnode, + (const unsigned long __user *)old_nodes, + (const unsigned long __user *)new_nodes); } #endif /* CONFIG_COMPAT */ From patchwork Tue Jul 27 14:48:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12403019 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5616CC41537 for ; Tue, 27 Jul 2021 14:50:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3993861A7F for ; Tue, 27 Jul 2021 14:50:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237191AbhG0Ou5 (ORCPT ); Tue, 27 Jul 2021 10:50:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:36534 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236885AbhG0Otz (ORCPT ); Tue, 27 Jul 2021 10:49:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E17B061B1C; Tue, 27 Jul 2021 14:49:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627397389; bh=X2nOSkrct+//jg3b+OT1UZgDOHMaIVr8tgJbcn/ga38=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V+WiBM2iDbed3S1lXCoei/5xc4g9DGGgtA7pQH+Qt2I0K75Zf9pW+nLnvSJsmWMsn OtUgqYRzsktYPf4ptO3uAEHupQ2j2Z1LvZBuQEODEo+wbREcD7QmyNFaanGzy3VxIV qXyX7Gh68Yb0a28bx83e5+ssQh+AUZ53tPzxV/dbN1rt4A+0GeykrotU+na3SJyyRW 2d70Pt+1i2MspZipYViyOKhxjJNQXobIIeBDDO/VX+l2Gq/SuZxDfMRgikY+zCVCOI IMWAyiJbdJVI+ssjiefmVwFlPzpb42f3pr1v9jBJxkzz6xU92ZoqmRjL4HMdaQG0d6 XWAUl2F/L1O4Q== From: Arnd Bergmann To: Andrew Morton Cc: Arnd Bergmann , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S. Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Al Viro , "Eric W. Biederman" , Christoph Hellwig , Feng Tang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig Subject: [PATCH v5 5/6] compat: remove some compat entry points Date: Tue, 27 Jul 2021 16:48:58 +0200 Message-Id: <20210727144859.4150043-6-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210727144859.4150043-1-arnd@kernel.org> References: <20210727144859.4150043-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Arnd Bergmann These are all handled correctly when calling the native system call entry point, so remove the special cases. Reviewed-by: Christoph Hellwig Signed-off-by: Arnd Bergmann --- arch/arm64/include/asm/unistd32.h | 10 +++--- arch/mips/kernel/syscalls/syscall_n32.tbl | 10 +++--- arch/mips/kernel/syscalls/syscall_o32.tbl | 10 +++--- arch/parisc/kernel/syscalls/syscall.tbl | 8 ++--- arch/powerpc/kernel/syscalls/syscall.tbl | 10 +++--- arch/s390/kernel/syscalls/syscall.tbl | 10 +++--- arch/sparc/kernel/syscalls/syscall.tbl | 10 +++--- arch/x86/entry/syscalls/syscall_32.tbl | 4 +-- arch/x86/entry/syscalls/syscall_64.tbl | 2 +- include/linux/compat.h | 20 ------------ include/uapi/asm-generic/unistd.h | 10 +++--- kernel/sys_ni.c | 5 --- mm/mempolicy.c | 37 ----------------------- mm/migrate.c | 13 -------- 14 files changed, 42 insertions(+), 117 deletions(-) diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 99ffcafc736c..8a5cf6daf7c0 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -649,11 +649,11 @@ __SYSCALL(__NR_inotify_add_watch, sys_inotify_add_watch) #define __NR_inotify_rm_watch 318 __SYSCALL(__NR_inotify_rm_watch, sys_inotify_rm_watch) #define __NR_mbind 319 -__SYSCALL(__NR_mbind, compat_sys_mbind) +__SYSCALL(__NR_mbind, sys_mbind) #define __NR_get_mempolicy 320 -__SYSCALL(__NR_get_mempolicy, compat_sys_get_mempolicy) +__SYSCALL(__NR_get_mempolicy, sys_get_mempolicy) #define __NR_set_mempolicy 321 -__SYSCALL(__NR_set_mempolicy, compat_sys_set_mempolicy) +__SYSCALL(__NR_set_mempolicy, sys_set_mempolicy) #define __NR_openat 322 __SYSCALL(__NR_openat, compat_sys_openat) #define __NR_mkdirat 323 @@ -699,7 +699,7 @@ __SYSCALL(__NR_tee, sys_tee) #define __NR_vmsplice 343 __SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_move_pages 344 -__SYSCALL(__NR_move_pages, compat_sys_move_pages) +__SYSCALL(__NR_move_pages, sys_move_pages) #define __NR_getcpu 345 __SYSCALL(__NR_getcpu, sys_getcpu) #define __NR_epoll_pwait 346 @@ -811,7 +811,7 @@ __SYSCALL(__NR_rseq, sys_rseq) #define __NR_io_pgetevents 399 __SYSCALL(__NR_io_pgetevents, compat_sys_io_pgetevents) #define __NR_migrate_pages 400 -__SYSCALL(__NR_migrate_pages, compat_sys_migrate_pages) +__SYSCALL(__NR_migrate_pages, sys_migrate_pages) #define __NR_kexec_file_load 401 __SYSCALL(__NR_kexec_file_load, sys_kexec_file_load) /* 402 is unused */ diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl index c2d2e19abea8..c42378dbb1c2 100644 --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -239,9 +239,9 @@ 228 n32 clock_nanosleep sys_clock_nanosleep_time32 229 n32 tgkill sys_tgkill 230 n32 utimes sys_utimes_time32 -231 n32 mbind compat_sys_mbind -232 n32 get_mempolicy compat_sys_get_mempolicy -233 n32 set_mempolicy compat_sys_set_mempolicy +231 n32 mbind sys_mbind +232 n32 get_mempolicy sys_get_mempolicy +233 n32 set_mempolicy sys_set_mempolicy 234 n32 mq_open compat_sys_mq_open 235 n32 mq_unlink sys_mq_unlink 236 n32 mq_timedsend sys_mq_timedsend_time32 @@ -258,7 +258,7 @@ 247 n32 inotify_init sys_inotify_init 248 n32 inotify_add_watch sys_inotify_add_watch 249 n32 inotify_rm_watch sys_inotify_rm_watch -250 n32 migrate_pages compat_sys_migrate_pages +250 n32 migrate_pages sys_migrate_pages 251 n32 openat sys_openat 252 n32 mkdirat sys_mkdirat 253 n32 mknodat sys_mknodat @@ -279,7 +279,7 @@ 268 n32 sync_file_range sys_sync_file_range 269 n32 tee sys_tee 270 n32 vmsplice sys_vmsplice -271 n32 move_pages compat_sys_move_pages +271 n32 move_pages sys_move_pages 272 n32 set_robust_list compat_sys_set_robust_list 273 n32 get_robust_list compat_sys_get_robust_list 274 n32 kexec_load compat_sys_kexec_load diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl index 253f2cd70b6b..5ff8ef9d8a04 100644 --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -279,9 +279,9 @@ 265 o32 clock_nanosleep sys_clock_nanosleep_time32 266 o32 tgkill sys_tgkill 267 o32 utimes sys_utimes_time32 -268 o32 mbind sys_mbind compat_sys_mbind -269 o32 get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy -270 o32 set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy +268 o32 mbind sys_mbind +269 o32 get_mempolicy sys_get_mempolicy +270 o32 set_mempolicy sys_set_mempolicy 271 o32 mq_open sys_mq_open compat_sys_mq_open 272 o32 mq_unlink sys_mq_unlink 273 o32 mq_timedsend sys_mq_timedsend_time32 @@ -298,7 +298,7 @@ 284 o32 inotify_init sys_inotify_init 285 o32 inotify_add_watch sys_inotify_add_watch 286 o32 inotify_rm_watch sys_inotify_rm_watch -287 o32 migrate_pages sys_migrate_pages compat_sys_migrate_pages +287 o32 migrate_pages sys_migrate_pages 288 o32 openat sys_openat compat_sys_openat 289 o32 mkdirat sys_mkdirat 290 o32 mknodat sys_mknodat @@ -319,7 +319,7 @@ 305 o32 sync_file_range sys_sync_file_range sys32_sync_file_range 306 o32 tee sys_tee 307 o32 vmsplice sys_vmsplice -308 o32 move_pages sys_move_pages compat_sys_move_pages +308 o32 move_pages sys_move_pages 309 o32 set_robust_list sys_set_robust_list compat_sys_set_robust_list 310 o32 get_robust_list sys_get_robust_list compat_sys_get_robust_list 311 o32 kexec_load sys_kexec_load compat_sys_kexec_load diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl index e26187b9ab87..21be3d200e7b 100644 --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -292,9 +292,9 @@ 258 32 clock_nanosleep sys_clock_nanosleep_time32 258 64 clock_nanosleep sys_clock_nanosleep 259 common tgkill sys_tgkill -260 common mbind sys_mbind compat_sys_mbind -261 common get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy -262 common set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy +260 common mbind sys_mbind +261 common get_mempolicy sys_get_mempolicy +262 common set_mempolicy sys_set_mempolicy # 263 was vserver 264 common add_key sys_add_key 265 common request_key sys_request_key @@ -331,7 +331,7 @@ 292 64 sync_file_range sys_sync_file_range 293 common tee sys_tee 294 common vmsplice sys_vmsplice -295 common move_pages sys_move_pages compat_sys_move_pages +295 common move_pages sys_move_pages 296 common getcpu sys_getcpu 297 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait 298 common statfs64 sys_statfs64 compat_sys_statfs64 diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl index aef2a290e71a..9e237232d108 100644 --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -330,10 +330,10 @@ 256 64 sys_debug_setcontext sys_ni_syscall 256 spu sys_debug_setcontext sys_ni_syscall # 257 reserved for vserver -258 nospu migrate_pages sys_migrate_pages compat_sys_migrate_pages -259 nospu mbind sys_mbind compat_sys_mbind -260 nospu get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy -261 nospu set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy +258 nospu migrate_pages sys_migrate_pages +259 nospu mbind sys_mbind +260 nospu get_mempolicy sys_get_mempolicy +261 nospu set_mempolicy sys_set_mempolicy 262 nospu mq_open sys_mq_open compat_sys_mq_open 263 nospu mq_unlink sys_mq_unlink 264 32 mq_timedsend sys_mq_timedsend_time32 @@ -381,7 +381,7 @@ 298 common faccessat sys_faccessat 299 common get_robust_list sys_get_robust_list compat_sys_get_robust_list 300 common set_robust_list sys_set_robust_list compat_sys_set_robust_list -301 common move_pages sys_move_pages compat_sys_move_pages +301 common move_pages sys_move_pages 302 common getcpu sys_getcpu 303 nospu epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait 304 32 utimensat sys_utimensat_time32 diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl index 64d51ab5a8b4..81bff2ffe6c0 100644 --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -274,9 +274,9 @@ 265 common statfs64 sys_statfs64 compat_sys_statfs64 266 common fstatfs64 sys_fstatfs64 compat_sys_fstatfs64 267 common remap_file_pages sys_remap_file_pages sys_remap_file_pages -268 common mbind sys_mbind compat_sys_mbind -269 common get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy -270 common set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy +268 common mbind sys_mbind sys_mbind +269 common get_mempolicy sys_get_mempolicy sys_get_mempolicy +270 common set_mempolicy sys_set_mempolicy sys_set_mempolicy 271 common mq_open sys_mq_open compat_sys_mq_open 272 common mq_unlink sys_mq_unlink sys_mq_unlink 273 common mq_timedsend sys_mq_timedsend sys_mq_timedsend_time32 @@ -293,7 +293,7 @@ 284 common inotify_init sys_inotify_init sys_inotify_init 285 common inotify_add_watch sys_inotify_add_watch sys_inotify_add_watch 286 common inotify_rm_watch sys_inotify_rm_watch sys_inotify_rm_watch -287 common migrate_pages sys_migrate_pages compat_sys_migrate_pages +287 common migrate_pages sys_migrate_pages sys_migrate_pages 288 common openat sys_openat compat_sys_openat 289 common mkdirat sys_mkdirat sys_mkdirat 290 common mknodat sys_mknodat sys_mknodat @@ -317,7 +317,7 @@ 307 common sync_file_range sys_sync_file_range compat_sys_s390_sync_file_range 308 common tee sys_tee sys_tee 309 common vmsplice sys_vmsplice sys_vmsplice -310 common move_pages sys_move_pages compat_sys_move_pages +310 common move_pages sys_move_pages sys_move_pages 311 common getcpu sys_getcpu sys_getcpu 312 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait 313 common utimes sys_utimes sys_utimes_time32 diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl index 603f5a821502..ea1660a933c0 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -365,12 +365,12 @@ 299 common unshare sys_unshare 300 common set_robust_list sys_set_robust_list compat_sys_set_robust_list 301 common get_robust_list sys_get_robust_list compat_sys_get_robust_list -302 common migrate_pages sys_migrate_pages compat_sys_migrate_pages -303 common mbind sys_mbind compat_sys_mbind -304 common get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy -305 common set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy +302 common migrate_pages sys_migrate_pages +303 common mbind sys_mbind +304 common get_mempolicy sys_get_mempolicy +305 common set_mempolicy sys_set_mempolicy 306 common kexec_load sys_kexec_load compat_sys_kexec_load -307 common move_pages sys_move_pages compat_sys_move_pages +307 common move_pages sys_move_pages 308 common getcpu sys_getcpu 309 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait 310 32 utimensat sys_utimensat_time32 diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index ce763a12311c..f54c006603d6 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -286,7 +286,7 @@ 272 i386 fadvise64_64 sys_ia32_fadvise64_64 273 i386 vserver 274 i386 mbind sys_mbind -275 i386 get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy +275 i386 get_mempolicy sys_get_mempolicy 276 i386 set_mempolicy sys_set_mempolicy 277 i386 mq_open sys_mq_open compat_sys_mq_open 278 i386 mq_unlink sys_mq_unlink @@ -328,7 +328,7 @@ 314 i386 sync_file_range sys_ia32_sync_file_range 315 i386 tee sys_tee 316 i386 vmsplice sys_vmsplice -317 i386 move_pages sys_move_pages compat_sys_move_pages +317 i386 move_pages sys_move_pages 318 i386 getcpu sys_getcpu 319 i386 epoll_pwait sys_epoll_pwait 320 i386 utimensat sys_utimensat_time32 diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index f6b57799c1ea..f3dfb5b97e15 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -397,7 +397,7 @@ 530 x32 set_robust_list compat_sys_set_robust_list 531 x32 get_robust_list compat_sys_get_robust_list 532 x32 vmsplice sys_vmsplice -533 x32 move_pages compat_sys_move_pages +533 x32 move_pages sys_move_pages 534 x32 preadv compat_sys_preadv64 535 x32 pwritev compat_sys_pwritev64 536 x32 rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo diff --git a/include/linux/compat.h b/include/linux/compat.h index 3a2ac5afee30..2d42cebd1fb8 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -799,26 +799,6 @@ asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr /* mm/fadvise.c: No generic prototype for fadvise64_64 */ /* mm/, CONFIG_MMU only */ -asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len, - compat_ulong_t mode, - compat_ulong_t __user *nmask, - compat_ulong_t maxnode, compat_ulong_t flags); -asmlinkage long compat_sys_get_mempolicy(int __user *policy, - compat_ulong_t __user *nmask, - compat_ulong_t maxnode, - compat_ulong_t addr, - compat_ulong_t flags); -asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask, - compat_ulong_t maxnode); -asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, - compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes, - const compat_ulong_t __user *new_nodes); -asmlinkage long compat_sys_move_pages(pid_t pid, compat_ulong_t nr_pages, - __u32 __user *pages, - const int __user *nodes, - int __user *status, - int flags); - asmlinkage long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, struct compat_siginfo __user *uinfo); diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index a9d6fcd95f42..cde0439913b4 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -673,15 +673,15 @@ __SYSCALL(__NR_madvise, sys_madvise) #define __NR_remap_file_pages 234 __SYSCALL(__NR_remap_file_pages, sys_remap_file_pages) #define __NR_mbind 235 -__SC_COMP(__NR_mbind, sys_mbind, compat_sys_mbind) +__SYSCALL(__NR_mbind, sys_mbind) #define __NR_get_mempolicy 236 -__SC_COMP(__NR_get_mempolicy, sys_get_mempolicy, compat_sys_get_mempolicy) +__SYSCALL(__NR_get_mempolicy, sys_get_mempolicy) #define __NR_set_mempolicy 237 -__SC_COMP(__NR_set_mempolicy, sys_set_mempolicy, compat_sys_set_mempolicy) +__SYSCALL(__NR_set_mempolicy, sys_set_mempolicy) #define __NR_migrate_pages 238 -__SC_COMP(__NR_migrate_pages, sys_migrate_pages, compat_sys_migrate_pages) +__SYSCALL(__NR_migrate_pages, sys_migrate_pages) #define __NR_move_pages 239 -__SC_COMP(__NR_move_pages, sys_move_pages, compat_sys_move_pages) +__SYSCALL(__NR_move_pages, sys_move_pages) #endif #define __NR_rt_tgsigqueueinfo 240 diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index 30971b1dd4a9..52c27ecf5ff7 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -291,15 +291,10 @@ COND_SYSCALL(madvise); COND_SYSCALL(process_madvise); COND_SYSCALL(remap_file_pages); COND_SYSCALL(mbind); -COND_SYSCALL_COMPAT(mbind); COND_SYSCALL(get_mempolicy); -COND_SYSCALL_COMPAT(get_mempolicy); COND_SYSCALL(set_mempolicy); -COND_SYSCALL_COMPAT(set_mempolicy); COND_SYSCALL(migrate_pages); -COND_SYSCALL_COMPAT(migrate_pages); COND_SYSCALL(move_pages); -COND_SYSCALL_COMPAT(move_pages); COND_SYSCALL(perf_event_open); COND_SYSCALL(accept4); diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 9bc5dabdb7a7..6fdfc8ab6770 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1647,43 +1647,6 @@ SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, return kernel_get_mempolicy(policy, nmask, maxnode, addr, flags); } -#ifdef CONFIG_COMPAT - -COMPAT_SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, - compat_ulong_t __user *, nmask, - compat_ulong_t, maxnode, - compat_ulong_t, addr, compat_ulong_t, flags) -{ - return kernel_get_mempolicy(policy, (unsigned long __user *)nmask, - maxnode, addr, flags); -} - -COMPAT_SYSCALL_DEFINE3(set_mempolicy, int, mode, compat_ulong_t __user *, nmask, - compat_ulong_t, maxnode) -{ - return kernel_set_mempolicy(mode, (unsigned long __user *)nmask, maxnode); -} - -COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len, - compat_ulong_t, mode, compat_ulong_t __user *, nmask, - compat_ulong_t, maxnode, compat_ulong_t, flags) -{ - return kernel_mbind(start, len, mode, (unsigned long __user *)nmask, - maxnode, flags); -} - -COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, - compat_ulong_t, maxnode, - const compat_ulong_t __user *, old_nodes, - const compat_ulong_t __user *, new_nodes) -{ - return kernel_migrate_pages(pid, maxnode, - (const unsigned long __user *)old_nodes, - (const unsigned long __user *)new_nodes); -} - -#endif /* CONFIG_COMPAT */ - bool vma_migratable(struct vm_area_struct *vma) { if (vma->vm_flags & (VM_IO | VM_PFNMAP)) diff --git a/mm/migrate.c b/mm/migrate.c index 60634d2653b9..266ae1837b6a 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1967,19 +1967,6 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, return kernel_move_pages(pid, nr_pages, pages, nodes, status, flags); } -#ifdef CONFIG_COMPAT -COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, - compat_uptr_t __user *, pages, - const int __user *, nodes, - int __user *, status, - int, flags) -{ - return kernel_move_pages(pid, nr_pages, - (const void __user *__user *)pages, - nodes, status, flags); -} -#endif /* CONFIG_COMPAT */ - #ifdef CONFIG_NUMA_BALANCING /* * Returns true if this is a safe migration target node for misplaced NUMA From patchwork Tue Jul 27 14:48:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12403021 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9447BC19F3D for ; Tue, 27 Jul 2021 14:51:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E08861B25 for ; Tue, 27 Jul 2021 14:51:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236793AbhG0Ou6 (ORCPT ); Tue, 27 Jul 2021 10:50:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:36574 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236978AbhG0Otz (ORCPT ); Tue, 27 Jul 2021 10:49:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 19DBB61B1F; Tue, 27 Jul 2021 14:49:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627397395; bh=aTWAf1eXMP7xx/2Vrh8rdB4xrBG9ZpKFtagjMdsIQEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oUFQpckuGTHhewIwqM/QIkbcSTBbQ1Za6maEsVwJ2IGMyxntteeBuQ7iOqKNvoBhH WZu6veChWE0d9nSFeUEIpgKs2m7hdEwaSYk8QLfP7mG7/DWCKXDXczKGTl6OW4J9li OHOTjoipxfPICNAhVkn72J7Q74X9xNIXuhORAAJZ7B3uB0uCd17JzRT6erqZpbS+PR 58/WeeoVkOPC6RJYueMHWWHzhGO1f9Qs2GHD3maRWPno6lvELWKoXLtfgXCdNkvFQI dhK3NMuKCMVrx25dg2oa2ud96yRq8XI7oJvU1yOCw/XzM6IhQn2z13/5LBa8vZxdwN WMWuo9XDXxhYA== From: Arnd Bergmann To: Andrew Morton Cc: Arnd Bergmann , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S. Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Al Viro , "Eric W. Biederman" , Christoph Hellwig , Feng Tang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v5 6/6] arch: remove compat_alloc_user_space Date: Tue, 27 Jul 2021 16:48:59 +0200 Message-Id: <20210727144859.4150043-7-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210727144859.4150043-1-arnd@kernel.org> References: <20210727144859.4150043-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Arnd Bergmann All users of compat_alloc_user_space() and copy_in_user() have been removed from the kernel, only a few functions in sparc remain that can be changed to calling arch_copy_in_user() instead. Signed-off-by: Arnd Bergmann Reviewed-by: Christoph Hellwig --- arch/arm64/include/asm/compat.h | 5 -- arch/arm64/include/asm/uaccess.h | 11 ---- arch/arm64/lib/Makefile | 2 +- arch/arm64/lib/copy_in_user.S | 77 ------------------------- arch/mips/cavium-octeon/octeon-memcpy.S | 2 - arch/mips/include/asm/compat.h | 8 --- arch/mips/include/asm/uaccess.h | 26 --------- arch/mips/lib/memcpy.S | 11 ---- arch/parisc/include/asm/compat.h | 6 -- arch/parisc/include/asm/uaccess.h | 2 - arch/parisc/lib/memcpy.c | 9 --- arch/powerpc/include/asm/compat.h | 16 ----- arch/s390/include/asm/compat.h | 10 ---- arch/s390/include/asm/uaccess.h | 3 - arch/s390/lib/uaccess.c | 63 -------------------- arch/sparc/include/asm/compat.h | 19 ------ arch/sparc/kernel/process_64.c | 2 +- arch/sparc/kernel/signal32.c | 12 ++-- arch/sparc/kernel/signal_64.c | 8 +-- arch/x86/include/asm/compat.h | 13 ----- arch/x86/include/asm/uaccess_64.h | 7 --- include/linux/compat.h | 2 - include/linux/uaccess.h | 10 ---- kernel/compat.c | 21 ------- 24 files changed, 12 insertions(+), 333 deletions(-) delete mode 100644 arch/arm64/lib/copy_in_user.S diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index 79c1a750e357..eaa6ca062d89 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -107,11 +107,6 @@ struct compat_statfs { #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current))) #define COMPAT_MINSIGSTKSZ 2048 -static inline void __user *arch_compat_alloc_user_space(long len) -{ - return (void __user *)compat_user_stack_pointer() - len; -} - struct compat_ipc64_perm { compat_key_t key; __compat_uid32_t uid; diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index b5f08621fa29..190b494e22ab 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -430,17 +430,6 @@ extern unsigned long __must_check __arch_copy_to_user(void __user *to, const voi __actu_ret; \ }) -extern unsigned long __must_check __arch_copy_in_user(void __user *to, const void __user *from, unsigned long n); -#define raw_copy_in_user(to, from, n) \ -({ \ - unsigned long __aciu_ret; \ - uaccess_ttbr0_enable(); \ - __aciu_ret = __arch_copy_in_user(__uaccess_mask_ptr(to), \ - __uaccess_mask_ptr(from), (n)); \ - uaccess_ttbr0_disable(); \ - __aciu_ret; \ -}) - #define INLINE_COPY_TO_USER #define INLINE_COPY_FROM_USER diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index 6dd56a49790a..0941180a86d3 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 lib-y := clear_user.o delay.o copy_from_user.o \ - copy_to_user.o copy_in_user.o copy_page.o \ + copy_to_user.o copy_page.o \ clear_page.o csum.o insn.o memchr.o memcpy.o \ memset.o memcmp.o strcmp.o strncmp.o strlen.o \ strnlen.o strchr.o strrchr.o tishift.o diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S deleted file mode 100644 index dbea3799c3ef..000000000000 --- a/arch/arm64/lib/copy_in_user.S +++ /dev/null @@ -1,77 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -/* - * Copy from user space to user space - * - * Copyright (C) 2012 ARM Ltd. - */ - -#include - -#include -#include -#include - -/* - * Copy from user space to user space (alignment handled by the hardware) - * - * Parameters: - * x0 - to - * x1 - from - * x2 - n - * Returns: - * x0 - bytes not copied - */ - .macro ldrb1 reg, ptr, val - user_ldst 9998f, ldtrb, \reg, \ptr, \val - .endm - - .macro strb1 reg, ptr, val - user_ldst 9998f, sttrb, \reg, \ptr, \val - .endm - - .macro ldrh1 reg, ptr, val - user_ldst 9997f, ldtrh, \reg, \ptr, \val - .endm - - .macro strh1 reg, ptr, val - user_ldst 9997f, sttrh, \reg, \ptr, \val - .endm - - .macro ldr1 reg, ptr, val - user_ldst 9997f, ldtr, \reg, \ptr, \val - .endm - - .macro str1 reg, ptr, val - user_ldst 9997f, sttr, \reg, \ptr, \val - .endm - - .macro ldp1 reg1, reg2, ptr, val - user_ldp 9997f, \reg1, \reg2, \ptr, \val - .endm - - .macro stp1 reg1, reg2, ptr, val - user_stp 9997f, \reg1, \reg2, \ptr, \val - .endm - -end .req x5 -srcin .req x15 -SYM_FUNC_START(__arch_copy_in_user) - add end, x0, x2 - mov srcin, x1 -#include "copy_template.S" - mov x0, #0 - ret -SYM_FUNC_END(__arch_copy_in_user) -EXPORT_SYMBOL(__arch_copy_in_user) - - .section .fixup,"ax" - .align 2 -9997: cmp dst, dstin - b.ne 9998f - // Before being absolutely sure we couldn't copy anything, try harder -USER(9998f, ldtrb tmp1w, [srcin]) -USER(9998f, sttrb tmp1w, [dst]) - add dst, dst, #1 -9998: sub x0, end, dst // bytes not copied - ret - .previous diff --git a/arch/mips/cavium-octeon/octeon-memcpy.S b/arch/mips/cavium-octeon/octeon-memcpy.S index 600d018cf354..0a515cde1c18 100644 --- a/arch/mips/cavium-octeon/octeon-memcpy.S +++ b/arch/mips/cavium-octeon/octeon-memcpy.S @@ -154,8 +154,6 @@ FEXPORT(__raw_copy_from_user) EXPORT_SYMBOL(__raw_copy_from_user) FEXPORT(__raw_copy_to_user) EXPORT_SYMBOL(__raw_copy_to_user) -FEXPORT(__raw_copy_in_user) -EXPORT_SYMBOL(__raw_copy_in_user) /* * Note: dst & src may be unaligned, len may be 0 * Temps diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h index 53f015a1b0a7..bbb3bc5a42fd 100644 --- a/arch/mips/include/asm/compat.h +++ b/arch/mips/include/asm/compat.h @@ -96,14 +96,6 @@ struct compat_statfs { #define COMPAT_OFF_T_MAX 0x7fffffff -static inline void __user *arch_compat_alloc_user_space(long len) -{ - struct pt_regs *regs = (struct pt_regs *) - ((unsigned long) current_thread_info() + THREAD_SIZE - 32) - 1; - - return (void __user *) (regs->regs[29] - len); -} - struct compat_ipc64_perm { compat_key_t key; __compat_uid32_t uid; diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index 783fecce65c8..f8f74f9f5883 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -428,7 +428,6 @@ do { \ extern size_t __raw_copy_from_user(void *__to, const void *__from, size_t __n); extern size_t __raw_copy_to_user(void *__to, const void *__from, size_t __n); -extern size_t __raw_copy_in_user(void *__to, const void *__from, size_t __n); static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) @@ -480,31 +479,6 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n) #define INLINE_COPY_FROM_USER #define INLINE_COPY_TO_USER -static inline unsigned long -raw_copy_in_user(void __user *to, const void __user *from, unsigned long n) -{ - register void __user *__cu_to_r __asm__("$4"); - register const void __user *__cu_from_r __asm__("$5"); - register long __cu_len_r __asm__("$6"); - - __cu_to_r = to; - __cu_from_r = from; - __cu_len_r = n; - - __asm__ __volatile__( - ".set\tnoreorder\n\t" - __MODULE_JAL(__raw_copy_in_user) - ".set\tnoat\n\t" - __UA_ADDU "\t$1, %1, %2\n\t" - ".set\tat\n\t" - ".set\treorder" - : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) - : - : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", - DADDI_SCRATCH, "memory"); - return __cu_len_r; -} - extern __kernel_size_t __bzero(void __user *addr, __kernel_size_t size); /* diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S index e19fb98b5d38..277c32296636 100644 --- a/arch/mips/lib/memcpy.S +++ b/arch/mips/lib/memcpy.S @@ -666,8 +666,6 @@ FEXPORT(__raw_copy_from_user) EXPORT_SYMBOL(__raw_copy_from_user) FEXPORT(__raw_copy_to_user) EXPORT_SYMBOL(__raw_copy_to_user) -FEXPORT(__raw_copy_in_user) -EXPORT_SYMBOL(__raw_copy_in_user) #endif /* Legacy Mode, user <-> user */ __BUILD_COPY_USER LEGACY_MODE USEROP USEROP @@ -703,13 +701,4 @@ EXPORT_SYMBOL(__raw_copy_to_user) __BUILD_COPY_USER EVA_MODE KERNELOP USEROP END(__raw_copy_to_user) -/* - * __copy_in_user (EVA) - */ - -LEAF(__raw_copy_in_user) -EXPORT_SYMBOL(__raw_copy_in_user) -__BUILD_COPY_USER EVA_MODE USEROP USEROP -END(__raw_copy_in_user) - #endif diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h index b5d90e82b65d..c04f5a637c39 100644 --- a/arch/parisc/include/asm/compat.h +++ b/arch/parisc/include/asm/compat.h @@ -163,12 +163,6 @@ struct compat_shmid64_ds { #define COMPAT_ELF_NGREG 80 typedef compat_ulong_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; -static __inline__ void __user *arch_compat_alloc_user_space(long len) -{ - struct pt_regs *regs = ¤t->thread.regs; - return (void __user *)regs->gr[30]; -} - static inline int __is_compat_task(struct task_struct *t) { return test_tsk_thread_flag(t, TIF_32BIT); diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h index ed2cd4fb479b..7c13314aae4a 100644 --- a/arch/parisc/include/asm/uaccess.h +++ b/arch/parisc/include/asm/uaccess.h @@ -215,8 +215,6 @@ unsigned long __must_check raw_copy_to_user(void __user *dst, const void *src, unsigned long len); unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src, unsigned long len); -unsigned long __must_check raw_copy_in_user(void __user *dst, const void __user *src, - unsigned long len); #define INLINE_COPY_TO_USER #define INLINE_COPY_FROM_USER diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c index 4b75388190b4..ea70a0e08321 100644 --- a/arch/parisc/lib/memcpy.c +++ b/arch/parisc/lib/memcpy.c @@ -38,14 +38,6 @@ unsigned long raw_copy_from_user(void *dst, const void __user *src, } EXPORT_SYMBOL(raw_copy_from_user); -unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len) -{ - mtsp(get_user_space(), 1); - mtsp(get_user_space(), 2); - return pa_memcpy((void __force *)dst, (void __force *)src, len); -} - - void * memcpy(void * dst,const void *src, size_t count) { mtsp(get_kernel_space(), 1); @@ -54,7 +46,6 @@ void * memcpy(void * dst,const void *src, size_t count) return dst; } -EXPORT_SYMBOL(raw_copy_in_user); EXPORT_SYMBOL(memcpy); bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h index e33dcf134cdd..7afc96fb6524 100644 --- a/arch/powerpc/include/asm/compat.h +++ b/arch/powerpc/include/asm/compat.h @@ -83,22 +83,6 @@ struct compat_statfs { #define COMPAT_OFF_T_MAX 0x7fffffff -static inline void __user *arch_compat_alloc_user_space(long len) -{ - struct pt_regs *regs = current->thread.regs; - unsigned long usp = regs->gpr[1]; - - /* - * We can't access below the stack pointer in the 32bit ABI and - * can access 288 bytes in the 64bit big-endian ABI, - * or 512 bytes with the new ELFv2 little-endian ABI. - */ - if (!is_32bit_task()) - usp -= USER_REDZONE_SIZE; - - return (void __user *) (usp - len); -} - /* * ipc64_perm is actually 32/64bit clean but since the compat layer refers to * it we may as well define it. diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h index 8d49505b4a43..cdc7ae72529d 100644 --- a/arch/s390/include/asm/compat.h +++ b/arch/s390/include/asm/compat.h @@ -176,16 +176,6 @@ static inline int is_compat_task(void) return test_thread_flag(TIF_31BIT); } -static inline void __user *arch_compat_alloc_user_space(long len) -{ - unsigned long stack; - - stack = KSTK_ESP(current); - if (is_compat_task()) - stack &= 0x7fffffffUL; - return (void __user *) (stack - len); -} - #endif struct compat_ipc64_perm { diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h index 2316f2440881..98a1fce2ce67 100644 --- a/arch/s390/include/asm/uaccess.h +++ b/arch/s390/include/asm/uaccess.h @@ -227,9 +227,6 @@ static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long s __get_user(x, ptr); \ }) -unsigned long __must_check -raw_copy_in_user(void __user *to, const void __user *from, unsigned long n); - /* * Copy a null terminated string from userspace. */ diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c index 7ec8b1fa0f08..0df833cedd2c 100644 --- a/arch/s390/lib/uaccess.c +++ b/arch/s390/lib/uaccess.c @@ -204,69 +204,6 @@ unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long } EXPORT_SYMBOL(raw_copy_to_user); -static inline unsigned long copy_in_user_mvcos(void __user *to, const void __user *from, - unsigned long size) -{ - unsigned long tmp1, tmp2; - - tmp1 = -4096UL; - /* FIXME: copy with reduced length. */ - asm volatile( - " lgr 0,%[spec]\n" - "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n" - " jz 2f\n" - "1: algr %0,%3\n" - " slgr %1,%3\n" - " slgr %2,%3\n" - " j 0b\n" - "2:slgr %0,%0\n" - "3: \n" - EX_TABLE(0b,3b) - : "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2) - : [spec] "d" (0x810081UL) - : "cc", "memory", "0"); - return size; -} - -static inline unsigned long copy_in_user_mvc(void __user *to, const void __user *from, - unsigned long size) -{ - unsigned long tmp1; - - asm volatile( - " sacf 256\n" - " aghi %0,-1\n" - " jo 5f\n" - " bras %3,3f\n" - "0: aghi %0,257\n" - "1: mvc 0(1,%1),0(%2)\n" - " la %1,1(%1)\n" - " la %2,1(%2)\n" - " aghi %0,-1\n" - " jnz 1b\n" - " j 5f\n" - "2: mvc 0(256,%1),0(%2)\n" - " la %1,256(%1)\n" - " la %2,256(%2)\n" - "3: aghi %0,-256\n" - " jnm 2b\n" - "4: ex %0,1b-0b(%3)\n" - "5: slgr %0,%0\n" - "6: sacf 768\n" - EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b) - : "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1) - : : "cc", "memory"); - return size; -} - -unsigned long raw_copy_in_user(void __user *to, const void __user *from, unsigned long n) -{ - if (copy_with_mvcos()) - return copy_in_user_mvcos(to, from, n); - return copy_in_user_mvc(to, from, n); -} -EXPORT_SYMBOL(raw_copy_in_user); - static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size) { unsigned long tmp1, tmp2; diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h index 8b63410e830f..bd949fcf9d63 100644 --- a/arch/sparc/include/asm/compat.h +++ b/arch/sparc/include/asm/compat.h @@ -116,25 +116,6 @@ struct compat_statfs { #define COMPAT_OFF_T_MAX 0x7fffffff -#ifdef CONFIG_COMPAT -static inline void __user *arch_compat_alloc_user_space(long len) -{ - struct pt_regs *regs = current_thread_info()->kregs; - unsigned long usp = regs->u_regs[UREG_I6]; - - if (test_thread_64bit_stack(usp)) - usp += STACK_BIAS; - - if (test_thread_flag(TIF_32BIT)) - usp &= 0xffffffffUL; - - usp -= len; - usp &= ~0x7UL; - - return (void __user *) usp; -} -#endif - struct compat_ipc64_perm { compat_key_t key; __compat_uid32_t uid; diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index d33c58a58d4f..4f5967ebf4e5 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -458,7 +458,7 @@ static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) distance = fp - psp; rval = (csp - distance); - if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) + if (raw_copy_in_user((void __user *)rval, (void __user *)psp, distance)) rval = 0; else if (!stack_64bit) { if (put_user(((u32)csp), diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c index e9695a06492f..afd8455ea05f 100644 --- a/arch/sparc/kernel/signal32.c +++ b/arch/sparc/kernel/signal32.c @@ -435,9 +435,9 @@ static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); if (!wsaved) { - err |= copy_in_user((u32 __user *)sf, - (u32 __user *)(regs->u_regs[UREG_FP]), - sizeof(struct reg_window32)); + err |= raw_copy_in_user((u32 __user *)sf, + (u32 __user *)(regs->u_regs[UREG_FP]), + sizeof(struct reg_window32)); } else { struct reg_window *rp; @@ -567,9 +567,9 @@ static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t)); if (!wsaved) { - err |= copy_in_user((u32 __user *)sf, - (u32 __user *)(regs->u_regs[UREG_FP]), - sizeof(struct reg_window32)); + err |= raw_copy_in_user((u32 __user *)sf, + (u32 __user *)(regs->u_regs[UREG_FP]), + sizeof(struct reg_window32)); } else { struct reg_window *rp; diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c index a0eec62c825d..3bc4a25f7c25 100644 --- a/arch/sparc/kernel/signal_64.c +++ b/arch/sparc/kernel/signal_64.c @@ -406,10 +406,10 @@ setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs) err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t)); if (!wsaved) { - err |= copy_in_user((u64 __user *)sf, - (u64 __user *)(regs->u_regs[UREG_FP] + - STACK_BIAS), - sizeof(struct reg_window)); + err |= raw_copy_in_user((u64 __user *)sf, + (u64 __user *)(regs->u_regs[UREG_FP] + + STACK_BIAS), + sizeof(struct reg_window)); } else { struct reg_window *rp; diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h index 4ae01cdb99de..7516e4199b3c 100644 --- a/arch/x86/include/asm/compat.h +++ b/arch/x86/include/asm/compat.h @@ -156,19 +156,6 @@ struct compat_shmid64_ds { (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)) #endif -static inline void __user *arch_compat_alloc_user_space(long len) -{ - compat_uptr_t sp = task_pt_regs(current)->sp; - - /* - * -128 for the x32 ABI redzone. For IA32, it is not strictly - * necessary, but not harmful. - */ - sp -= 128; - - return (void __user *)round_down(sp - len, 16); -} - static inline bool in_x32_syscall(void) { #ifdef CONFIG_X86_X32_ABI diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h index e7265a552f4f..45697e04d771 100644 --- a/arch/x86/include/asm/uaccess_64.h +++ b/arch/x86/include/asm/uaccess_64.h @@ -58,13 +58,6 @@ raw_copy_to_user(void __user *dst, const void *src, unsigned long size) return copy_user_generic((__force void *)dst, src, size); } -static __always_inline __must_check -unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long size) -{ - return copy_user_generic((__force void *)dst, - (__force void *)src, size); -} - extern long __copy_user_nocache(void *dst, const void __user *src, unsigned size, int zerorest); diff --git a/include/linux/compat.h b/include/linux/compat.h index 2d42cebd1fb8..1c758b0e0359 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -511,8 +511,6 @@ extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request, struct epoll_event; /* fortunately, this one is fixed-layout */ -extern void __user *compat_alloc_user_space(unsigned long len); - int compat_restore_altstack(const compat_stack_t __user *uss); int __compat_save_altstack(compat_stack_t __user *, unsigned long); #define unsafe_compat_save_altstack(uss, sp, label) do { \ diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index c05e903cef02..ac0394087f7d 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -200,16 +200,6 @@ copy_to_user(void __user *to, const void *from, unsigned long n) n = _copy_to_user(to, from, n); return n; } -#ifdef CONFIG_COMPAT -static __always_inline unsigned long __must_check -copy_in_user(void __user *to, const void __user *from, unsigned long n) -{ - might_fault(); - if (access_ok(to, n) && access_ok(from, n)) - n = raw_copy_in_user(to, from, n); - return n; -} -#endif #ifndef copy_mc_to_kernel /* diff --git a/kernel/compat.c b/kernel/compat.c index 05adfd6fa8bf..55551989d9da 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -269,24 +269,3 @@ get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat) return 0; } EXPORT_SYMBOL_GPL(get_compat_sigset); - -/* - * Allocate user-space memory for the duration of a single system call, - * in order to marshall parameters inside a compat thunk. - */ -void __user *compat_alloc_user_space(unsigned long len) -{ - void __user *ptr; - - /* If len would occupy more than half of the entire compat space... */ - if (unlikely(len > (((compat_uptr_t)~0) >> 1))) - return NULL; - - ptr = arch_compat_alloc_user_space(len); - - if (unlikely(!access_ok(ptr, len))) - return NULL; - - return ptr; -} -EXPORT_SYMBOL_GPL(compat_alloc_user_space);