From patchwork Fri Sep 25 04:51:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11798885 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 961406CA for ; Fri, 25 Sep 2020 04:53:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70E4721D7A for ; Fri, 25 Sep 2020 04:53:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="YRZ6UItj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727068AbgIYExO (ORCPT ); Fri, 25 Sep 2020 00:53:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727132AbgIYEwD (ORCPT ); Fri, 25 Sep 2020 00:52:03 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7CF04C0613CE; Thu, 24 Sep 2020 21:52:02 -0700 (PDT) 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=V2KQALojh4L6beBNImM13vl1+M9h9pbSNeu7cAMkUV4=; b=YRZ6UItjewrMGlnbC32fQHH0nL X83aDncwPE4S+tAzXcTs147/MCyPcuKJjP5ADThQLA7wrBrzqeGAjrp6FjE1U9/h3zK4Fta7ItMLu lGrL5xFgOYZtnSlKvTqMCC2ac3NXDeIKxxgzLrrtPBfi1Jiy5HlCKIyVDbgpIzLr9WxT80NGgYsvE H0z53OI2xjmrSe5J9aFkHCJwR+vlS2kwDaUuJVRSZfZh7tDB4myry1cD4RgrJoOIoaCILBfUBIREx eAdy9JLwmXYqD2E7xLRZ6TmqIe9rC3bo9UapR3RmAXGjgME/WMvQ21T+nPbJl0NHTUQJGLyKZ2wRF HlTuMS7w==; 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 1kLfi8-0002rL-Hy; Fri, 25 Sep 2020 04:51:56 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , 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-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 7/9] fs: remove compat_sys_vmsplice Date: Fri, 25 Sep 2020 06:51:44 +0200 Message-Id: <20200925045146.1283714-8-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 Precedence: bulk List-ID: X-Mailing-List: keyrings@vger.kernel.org Now that import_iovec handles compat iovecs, the native vmsplice syscall can be used for the compat case as well. Signed-off-by: Christoph Hellwig --- arch/arm64/include/asm/unistd32.h | 2 +- arch/mips/kernel/syscalls/syscall_n32.tbl | 2 +- arch/mips/kernel/syscalls/syscall_o32.tbl | 2 +- arch/parisc/kernel/syscalls/syscall.tbl | 2 +- arch/powerpc/kernel/syscalls/syscall.tbl | 2 +- arch/s390/kernel/syscalls/syscall.tbl | 2 +- arch/sparc/kernel/syscalls/syscall.tbl | 2 +- arch/x86/entry/syscall_x32.c | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 2 +- arch/x86/entry/syscalls/syscall_64.tbl | 2 +- fs/splice.c | 57 +++++-------------- include/linux/compat.h | 4 -- include/uapi/asm-generic/unistd.h | 2 +- tools/include/uapi/asm-generic/unistd.h | 2 +- .../arch/powerpc/entry/syscalls/syscall.tbl | 2 +- .../perf/arch/s390/entry/syscalls/syscall.tbl | 2 +- .../arch/x86/entry/syscalls/syscall_64.tbl | 2 +- 17 files changed, 28 insertions(+), 62 deletions(-) diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 4a236493dca5b9..11dfae3a8563bd 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -697,7 +697,7 @@ __SYSCALL(__NR_sync_file_range2, compat_sys_aarch32_sync_file_range2) #define __NR_tee 342 __SYSCALL(__NR_tee, sys_tee) #define __NR_vmsplice 343 -__SYSCALL(__NR_vmsplice, compat_sys_vmsplice) +__SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_move_pages 344 __SYSCALL(__NR_move_pages, compat_sys_move_pages) #define __NR_getcpu 345 diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl index c99a92646f8ee9..5a39d4de0ac85b 100644 --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -278,7 +278,7 @@ 267 n32 splice sys_splice 268 n32 sync_file_range sys_sync_file_range 269 n32 tee sys_tee -270 n32 vmsplice compat_sys_vmsplice +270 n32 vmsplice sys_vmsplice 271 n32 move_pages compat_sys_move_pages 272 n32 set_robust_list compat_sys_set_robust_list 273 n32 get_robust_list compat_sys_get_robust_list diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl index 075064d10661bf..136efc6b8c5444 100644 --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -318,7 +318,7 @@ 304 o32 splice sys_splice 305 o32 sync_file_range sys_sync_file_range sys32_sync_file_range 306 o32 tee sys_tee -307 o32 vmsplice sys_vmsplice compat_sys_vmsplice +307 o32 vmsplice sys_vmsplice 308 o32 move_pages sys_move_pages compat_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 diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl index 192abde0001d9d..a9e184192caedd 100644 --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -330,7 +330,7 @@ 292 32 sync_file_range parisc_sync_file_range 292 64 sync_file_range sys_sync_file_range 293 common tee sys_tee -294 common vmsplice sys_vmsplice compat_sys_vmsplice +294 common vmsplice sys_vmsplice 295 common move_pages sys_move_pages compat_sys_move_pages 296 common getcpu sys_getcpu 297 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl index 6f1e2ecf0edad9..0d4985919ca34d 100644 --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -369,7 +369,7 @@ 282 common unshare sys_unshare 283 common splice sys_splice 284 common tee sys_tee -285 common vmsplice sys_vmsplice compat_sys_vmsplice +285 common vmsplice sys_vmsplice 286 common openat sys_openat compat_sys_openat 287 common mkdirat sys_mkdirat 288 common mknodat sys_mknodat diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl index 6101cf2e004cb4..b5495a42814bd1 100644 --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -316,7 +316,7 @@ 306 common splice sys_splice sys_splice 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 compat_sys_vmsplice +309 common vmsplice sys_vmsplice sys_vmsplice 310 common move_pages sys_move_pages compat_sys_move_pages 311 common getcpu sys_getcpu sys_getcpu 312 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl index a87ddb282ab16f..f1810c1a35caa5 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -38,7 +38,7 @@ 23 64 setuid sys_setuid 24 32 getuid sys_getuid16 24 64 getuid sys_getuid -25 common vmsplice sys_vmsplice compat_sys_vmsplice +25 common vmsplice sys_vmsplice 26 common ptrace sys_ptrace compat_sys_ptrace 27 common alarm sys_alarm 28 common sigaltstack sys_sigaltstack compat_sys_sigaltstack diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c index aa321444a41f63..a4840b9d50ad14 100644 --- a/arch/x86/entry/syscall_x32.c +++ b/arch/x86/entry/syscall_x32.c @@ -16,6 +16,7 @@ #define __x32_sys_writev __x64_sys_writev #define __x32_sys_getsockopt __x64_sys_getsockopt #define __x32_sys_setsockopt __x64_sys_setsockopt +#define __x32_sys_vmsplice __x64_sys_vmsplice #define __SYSCALL_64(nr, sym) diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 54ab4beb517f25..0fb2f172581e51 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -327,7 +327,7 @@ 313 i386 splice sys_splice 314 i386 sync_file_range sys_ia32_sync_file_range 315 i386 tee sys_tee -316 i386 vmsplice sys_vmsplice compat_sys_vmsplice +316 i386 vmsplice sys_vmsplice 317 i386 move_pages sys_move_pages compat_sys_move_pages 318 i386 getcpu sys_getcpu 319 i386 epoll_pwait sys_epoll_pwait diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index b1e59957c5c51c..642af919183de4 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -388,7 +388,7 @@ 529 x32 waitid compat_sys_waitid 530 x32 set_robust_list compat_sys_set_robust_list 531 x32 get_robust_list compat_sys_get_robust_list -532 x32 vmsplice compat_sys_vmsplice +532 x32 vmsplice sys_vmsplice 533 x32 move_pages compat_sys_move_pages 534 x32 preadv compat_sys_preadv64 535 x32 pwritev compat_sys_pwritev64 diff --git a/fs/splice.c b/fs/splice.c index 132d42b9871f9b..18d84544030b39 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -33,7 +33,6 @@ #include #include #include -#include #include #include "internal.h" @@ -1332,20 +1331,6 @@ static int vmsplice_type(struct fd f, int *type) * Currently we punt and implement it as a normal copy, see pipe_to_user(). * */ -static long do_vmsplice(struct file *f, struct iov_iter *iter, unsigned int flags) -{ - if (unlikely(flags & ~SPLICE_F_ALL)) - return -EINVAL; - - if (!iov_iter_count(iter)) - return 0; - - if (iov_iter_rw(iter) == WRITE) - return vmsplice_to_pipe(f, iter, flags); - else - return vmsplice_to_user(f, iter, flags); -} - SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov, unsigned long, nr_segs, unsigned int, flags) { @@ -1356,6 +1341,9 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov, struct fd f; int type; + if (unlikely(flags & ~SPLICE_F_ALL)) + return -EINVAL; + f = fdget(fd); error = vmsplice_type(f, &type); if (error) @@ -1363,40 +1351,21 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov, error = import_iovec(type, uiov, nr_segs, ARRAY_SIZE(iovstack), &iov, &iter); - if (error >= 0) { - error = do_vmsplice(f.file, &iter, flags); - kfree(iov); - } - fdput(f); - return error; -} + if (error < 0) + goto out_fdput; -#ifdef CONFIG_COMPAT -COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32, - unsigned int, nr_segs, unsigned int, flags) -{ - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t error; - struct fd f; - int type; - - f = fdget(fd); - error = vmsplice_type(f, &type); - if (error) - return error; + if (!iov_iter_count(&iter)) + error = 0; + else if (iov_iter_rw(&iter) == WRITE) + error = vmsplice_to_pipe(f.file, &iter, flags); + else + error = vmsplice_to_user(f.file, &iter, flags); - error = import_iovec(type, (struct iovec __user *)iov32, nr_segs, - ARRAY_SIZE(iovstack), &iov, &iter); - if (error >= 0) { - error = do_vmsplice(f.file, &iter, flags); - kfree(iov); - } + kfree(iov); +out_fdput: fdput(f); return error; } -#endif SYSCALL_DEFINE6(splice, int, fd_in, loff_t __user *, off_in, int, fd_out, loff_t __user *, off_out, diff --git a/include/linux/compat.h b/include/linux/compat.h index 0f1620988267e6..9e8aa148651455 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -597,10 +597,6 @@ asmlinkage long compat_sys_signalfd4(int ufd, const compat_sigset_t __user *sigmask, compat_size_t sigsetsize, int flags); -/* fs/splice.c */ -asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *, - unsigned int nr_segs, unsigned int flags); - /* fs/stat.c */ asmlinkage long compat_sys_newfstatat(unsigned int dfd, const char __user *filename, diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index 211c9eacbda6eb..f2dcb0d5703014 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -237,7 +237,7 @@ __SC_COMP(__NR_signalfd4, sys_signalfd4, compat_sys_signalfd4) /* fs/splice.c */ #define __NR_vmsplice 75 -__SC_COMP(__NR_vmsplice, sys_vmsplice, compat_sys_vmsplice) +__SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_splice 76 __SYSCALL(__NR_splice, sys_splice) #define __NR_tee 77 diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h index 211c9eacbda6eb..f2dcb0d5703014 100644 --- a/tools/include/uapi/asm-generic/unistd.h +++ b/tools/include/uapi/asm-generic/unistd.h @@ -237,7 +237,7 @@ __SC_COMP(__NR_signalfd4, sys_signalfd4, compat_sys_signalfd4) /* fs/splice.c */ #define __NR_vmsplice 75 -__SC_COMP(__NR_vmsplice, sys_vmsplice, compat_sys_vmsplice) +__SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_splice 76 __SYSCALL(__NR_splice, sys_splice) #define __NR_tee 77 diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl index 46be68029587f9..26f0347c15118b 100644 --- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl @@ -363,7 +363,7 @@ 282 common unshare sys_unshare 283 common splice sys_splice 284 common tee sys_tee -285 common vmsplice sys_vmsplice compat_sys_vmsplice +285 common vmsplice sys_vmsplice 286 common openat sys_openat compat_sys_openat 287 common mkdirat sys_mkdirat 288 common mknodat sys_mknodat diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl index fb5e61ce9d5838..02ad81f69bb7e3 100644 --- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl @@ -316,7 +316,7 @@ 306 common splice sys_splice compat_sys_splice 307 common sync_file_range sys_sync_file_range compat_sys_s390_sync_file_range 308 common tee sys_tee compat_sys_tee -309 common vmsplice sys_vmsplice compat_sys_vmsplice +309 common vmsplice sys_vmsplice sys_vmsplice 310 common move_pages sys_move_pages compat_sys_move_pages 311 common getcpu sys_getcpu compat_sys_getcpu 312 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl index b1e59957c5c51c..642af919183de4 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl @@ -388,7 +388,7 @@ 529 x32 waitid compat_sys_waitid 530 x32 set_robust_list compat_sys_set_robust_list 531 x32 get_robust_list compat_sys_get_robust_list -532 x32 vmsplice compat_sys_vmsplice +532 x32 vmsplice sys_vmsplice 533 x32 move_pages compat_sys_move_pages 534 x32 preadv compat_sys_preadv64 535 x32 pwritev compat_sys_pwritev64