From patchwork Fri Sep 25 04:51:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11798921 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 537FA6CA for ; Fri, 25 Sep 2020 04:54:44 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1484D21D91 for ; Fri, 25 Sep 2020 04:54:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="py9+Cku6"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ltDau4pr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1484D21D91 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=2DjVUvkKhAg3RAdRjz5cXI+bmsEOufRKqrvhIqime3Y=; b=py9+Cku6GHh35S3L3ytr3273p ptAV6qy1a+wct/OKpuIxeCUUnNzesaLiKOUEEisJUrLyolvxYMmXfALEM2/sTh4XmrDmjz0kulDMn N4VqKNxwY3FWSJHc5tVOdBcY0fS76/13uLrHU5A+9Y0q1bAGOeYEm/M6jhRsEY8XA6WeRDdOPkHJO zg/US+kPJqERsc59f8II/oO5/KvSpXVcOYoc9ZPQLmwvqRgvcvcgDYsmYi0NySLhdBS+f6JzBMPcT XfKyoJ/keBhE+F5fVNU9i1b1/wjKDQTLVf3tRAeRJuACZ6h7wf9pZsqmXtJPyLrJ0Xsz4wg23qB2d DVAOxIiSQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kLfj6-0007IU-8I; Fri, 25 Sep 2020 04:52:56 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kLfi7-0006vt-ME for linux-arm-kernel@merlin.infradead.org; Fri, 25 Sep 2020 04:51:56 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=XLI4wWnTND6XjkdS+V7znPEFtJ3sYq4EUOFrFZbEOM4=; b=ltDau4prtIYwpMEhyb+cdqxWTK GQAYP8faWYGCeQ5y9rXhu4VrSOuWAm8vpUTAaftV7VWf+gl59R8pGUhMazJ6EwpoQ++j9Ib+x6ibK S6A7SODjHRYDevm7+f3DVFp2RheB04CY4/1cAtKGPpyqv8WK+Kgxef40BUZwoQwL5r7/pIT1j9rou AOawdNyXcs7aXV/ZSST8iyc7ZCAA4+Ogm3x1GnUgJhgy9bAcFVkJ0cMiOO7TyZJwAo94yS2SU3UeL AobxOj3YCPWJwKilFg5y8sTwcEZ8UObu76Bj3XdaY9tnU/TNtGH5YipPXhrIj7eTT7jQnIkdj0D6J vVvtSS7Q==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kLfi6-0002qp-CZ; Fri, 25 Sep 2020 04:51:54 +0000 From: Christoph Hellwig To: Alexander Viro Subject: [PATCH 5/9] fs: remove various compat readv/writev helpers Date: Fri, 25 Sep 2020 06:51:42 +0200 Message-Id: <20200925045146.1283714-6-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200925045146.1283714-1-hch@lst.de> References: <20200925045146.1283714-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-aio@kvack.org, linux-mips@vger.kernel.org, David Howells , linux-mm@kvack.org, keyrings@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Arnd Bergmann , linux-block@vger.kernel.org, io-uring@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jens Axboe , linux-parisc@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, David Laight , linux-fsdevel@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Now that import_iovec handles compat iovecs as well, all the duplicated code in the compat readv/writev helpers is not needed. Remove them and switch the compat syscall handlers to use the native helpers. Signed-off-by: Christoph Hellwig --- fs/read_write.c | 179 +++++++---------------------------------- include/linux/compat.h | 20 ++--- 2 files changed, 40 insertions(+), 159 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 0a68037580b455..eab427b7cc0a3f 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1068,226 +1068,107 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, return do_pwritev(fd, vec, vlen, pos, flags); } +/* + * Various compat syscalls. Note that they all pretend to take a native + * iovec - import_iovec will properly treat those as compat_iovecs based on + * in_compat_syscall(). + */ #ifdef CONFIG_COMPAT -static size_t compat_readv(struct file *file, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t *pos, rwf_t flags) -{ - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t ret; - - ret = import_iovec(READ, (const struct iovec __user *)vec, vlen, - UIO_FASTIOV, &iov, &iter); - if (ret >= 0) { - ret = do_iter_read(file, &iter, pos, flags); - kfree(iov); - } - if (ret > 0) - add_rchar(current, ret); - inc_syscr(current); - return ret; -} - -static size_t do_compat_readv(compat_ulong_t fd, - const struct compat_iovec __user *vec, - compat_ulong_t vlen, rwf_t flags) -{ - struct fd f = fdget_pos(fd); - ssize_t ret; - loff_t pos; - - if (!f.file) - return -EBADF; - pos = f.file->f_pos; - ret = compat_readv(f.file, vec, vlen, &pos, flags); - if (ret >= 0) - f.file->f_pos = pos; - fdput_pos(f); - return ret; - -} - COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, compat_ulong_t, vlen) { - return do_compat_readv(fd, vec, vlen, 0); -} - -static long do_compat_preadv64(unsigned long fd, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t pos, rwf_t flags) -{ - struct fd f; - ssize_t ret; - - if (pos < 0) - return -EINVAL; - f = fdget(fd); - if (!f.file) - return -EBADF; - ret = -ESPIPE; - if (f.file->f_mode & FMODE_PREAD) - ret = compat_readv(f.file, vec, vlen, &pos, flags); - fdput(f); - return ret; + return do_readv(fd, vec, vlen, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos) { - return do_compat_preadv64(fd, vec, vlen, pos, 0); + return do_preadv(fd, vec, vlen, pos, 0); } #endif COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; - return do_compat_preadv64(fd, vec, vlen, pos, 0); + return do_preadv(fd, vec, vlen, pos, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2 COMPAT_SYSCALL_DEFINE5(preadv64v2, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos, rwf_t, flags) { if (pos == -1) - return do_compat_readv(fd, vec, vlen, flags); - - return do_compat_preadv64(fd, vec, vlen, pos, flags); + return do_readv(fd, vec, vlen, flags); + return do_preadv(fd, vec, vlen, pos, flags); } #endif COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high, rwf_t, flags) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; if (pos == -1) - return do_compat_readv(fd, vec, vlen, flags); - - return do_compat_preadv64(fd, vec, vlen, pos, flags); -} - -static size_t compat_writev(struct file *file, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t *pos, rwf_t flags) -{ - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t ret; - - ret = import_iovec(WRITE, (const struct iovec __user *)vec, vlen, - UIO_FASTIOV, &iov, &iter); - if (ret >= 0) { - file_start_write(file); - ret = do_iter_write(file, &iter, pos, flags); - file_end_write(file); - kfree(iov); - } - if (ret > 0) - add_wchar(current, ret); - inc_syscw(current); - return ret; -} - -static size_t do_compat_writev(compat_ulong_t fd, - const struct compat_iovec __user* vec, - compat_ulong_t vlen, rwf_t flags) -{ - struct fd f = fdget_pos(fd); - ssize_t ret; - loff_t pos; - - if (!f.file) - return -EBADF; - pos = f.file->f_pos; - ret = compat_writev(f.file, vec, vlen, &pos, flags); - if (ret >= 0) - f.file->f_pos = pos; - fdput_pos(f); - return ret; + return do_readv(fd, vec, vlen, flags); + return do_preadv(fd, vec, vlen, pos, flags); } COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, - const struct compat_iovec __user *, vec, + const struct iovec __user *, vec, compat_ulong_t, vlen) { - return do_compat_writev(fd, vec, vlen, 0); -} - -static long do_compat_pwritev64(unsigned long fd, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t pos, rwf_t flags) -{ - struct fd f; - ssize_t ret; - - if (pos < 0) - return -EINVAL; - f = fdget(fd); - if (!f.file) - return -EBADF; - ret = -ESPIPE; - if (f.file->f_mode & FMODE_PWRITE) - ret = compat_writev(f.file, vec, vlen, &pos, flags); - fdput(f); - return ret; + return do_writev(fd, vec, vlen, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos) { - return do_compat_pwritev64(fd, vec, vlen, pos, 0); + return do_pwritev(fd, vec, vlen, pos, 0); } #endif COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *,vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; - return do_compat_pwritev64(fd, vec, vlen, pos, 0); + return do_pwritev(fd, vec, vlen, pos, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2 COMPAT_SYSCALL_DEFINE5(pwritev64v2, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos, rwf_t, flags) { if (pos == -1) - return do_compat_writev(fd, vec, vlen, flags); - - return do_compat_pwritev64(fd, vec, vlen, pos, flags); + return do_writev(fd, vec, vlen, flags); + return do_pwritev(fd, vec, vlen, pos, flags); } #endif COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *,vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high, rwf_t, flags) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; if (pos == -1) - return do_compat_writev(fd, vec, vlen, flags); - - return do_compat_pwritev64(fd, vec, vlen, pos, flags); + return do_writev(fd, vec, vlen, flags); + return do_pwritev(fd, vec, vlen, pos, flags); } - -#endif +#endif /* CONFIG_COMPAT */ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count, loff_t max) diff --git a/include/linux/compat.h b/include/linux/compat.h index b930de791ff16b..306ea7e1172d8d 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -546,25 +546,25 @@ asmlinkage long compat_sys_getdents(unsigned int fd, /* fs/read_write.c */ asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int); asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd, - const struct compat_iovec __user *vec, compat_ulong_t vlen); + const struct iovec __user *vec, compat_ulong_t vlen); asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd, - const struct compat_iovec __user *vec, compat_ulong_t vlen); + const struct iovec __user *vec, compat_ulong_t vlen); /* No generic prototype for pread64 and pwrite64 */ asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, compat_ulong_t vlen, u32 pos_low, u32 pos_high); asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, compat_ulong_t vlen, u32 pos_low, u32 pos_high); #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 asmlinkage long compat_sys_preadv64(unsigned long fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, unsigned long vlen, loff_t pos); #endif #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 asmlinkage long compat_sys_pwritev64(unsigned long fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, unsigned long vlen, loff_t pos); #endif @@ -800,20 +800,20 @@ asmlinkage long compat_sys_execveat(int dfd, const char __user *filename, const compat_uptr_t __user *argv, const compat_uptr_t __user *envp, int flags); asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags); asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags); #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2 asmlinkage long compat_sys_preadv64v2(unsigned long fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, unsigned long vlen, loff_t pos, rwf_t flags); #endif #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2 asmlinkage long compat_sys_pwritev64v2(unsigned long fd, - const struct compat_iovec __user *vec, + const struct iovec __user *vec, unsigned long vlen, loff_t pos, rwf_t flags); #endif