From patchwork Sat Oct 8 05:53:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 613497 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2FFAAC4332F for ; Sat, 8 Oct 2022 05:55:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229683AbiJHFz0 (ORCPT ); Sat, 8 Oct 2022 01:55:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229458AbiJHFzT (ORCPT ); Sat, 8 Oct 2022 01:55:19 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3557D4D83E; Fri, 7 Oct 2022 22:55:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id BB757B803F2; Sat, 8 Oct 2022 05:55:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63C72C433D6; Sat, 8 Oct 2022 05:55:08 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="MUisIXJR" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1665208506; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=uodUNetgnawAm+SOTTtEpDSanhr+7/wxVqt9qqs9FW0=; b=MUisIXJRxr86GZJGsyixsucWfwtIcOZwoj9bfqBFAfNZmkNLQaK0SgrTJ9BZ8pEuGPZDh3 HkzerZ4c9Z3jGjbvUFDfme65TdlBxp5MzwkEBRxDx5603rFbf+xFT3moZYHHKqizcFREs8 Td8Z4lVpcfuxiLOhndNdwhqrvy0R6b4= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 10d02c6a (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Sat, 8 Oct 2022 05:55:05 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, patches@lists.linux.dev Cc: "Jason A. Donenfeld" , Andreas Noever , Andrew Morton , Andy Shevchenko , Borislav Petkov , Catalin Marinas , =?utf-8?q?Christoph_B=C3=B6hmwalder?= , Christoph Hellwig , Christophe Leroy , Daniel Borkmann , Dave Airlie , Dave Hansen , "David S . Miller" , Eric Dumazet , Florian Westphal , Greg Kroah-Hartman , "H . Peter Anvin" , Heiko Carstens , Helge Deller , Herbert Xu , Huacai Chen , Hugh Dickins , Jakub Kicinski , "James E . J . Bottomley" , Jan Kara , Jason Gunthorpe , Jens Axboe , Johannes Berg , Jonathan Corbet , Jozsef Kadlecsik , KP Singh , Kees Cook , Marco Elver , Mauro Carvalho Chehab , Michael Ellerman , Pablo Neira Ayuso , Paolo Abeni , Peter Zijlstra , Richard Weinberger , Russell King , Theodore Ts'o , Thomas Bogendoerfer , Thomas Gleixner , Thomas Graf , Ulf Hansson , Vignesh Raghavendra , WANG Xuerui , Will Deacon , Yury Norov , dri-devel@lists.freedesktop.org, kasan-dev@googlegroups.com, kernel-janitors@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-crypto@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-media@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org, linux-nvme@lists.infradead.org, linux-parisc@vger.kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v5 0/7] treewide cleanup of random integer usage Date: Fri, 7 Oct 2022 23:53:52 -0600 Message-Id: <20221008055359.286426-1-Jason@zx2c4.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Changes v4->v5: - Coccinelle is now used for as much mechanical aspects as possible, with mechanical parts split off from non-mechanical parts. This should drastically reduce the amount of code that needs to be reviewed carefully. Each commit mentions now if it was done by hand or is mechanical. Hi folks, This is a five part treewide cleanup of random integer handling. The rules for random integers are: - If you want a secure or an insecure random u64, use get_random_u64(). - If you want a secure or an insecure random u32, use get_random_u32(). * The old function prandom_u32() has been deprecated for a while now and is just a wrapper around get_random_u32(). Same for get_random_int(). - If you want a secure or an insecure random u16, use get_random_u16(). - If you want a secure or an insecure random u8, use get_random_u8(). - If you want secure or insecure random bytes, use get_random_bytes(). * The old function prandom_bytes() has been deprecated for a while now and has long been a wrapper around get_random_bytes(). - If you want a non-uniform random u32, u16, or u8 bounded by a certain open interval maximum, use prandom_u32_max(). * I say "non-uniform", because it doesn't do any rejection sampling or divisions. Hence, it stays within the prandom_* namespace. These rules ought to be applied uniformly, so that we can clean up the deprecated functions, and earn the benefits of using the modern functions. In particular, in addition to the boring substitutions, this patchset accomplishes a few nice effects: - By using prandom_u32_max() with an upper-bound that the compiler can prove at compile-time is ≤65536 or ≤256, internally get_random_u16() or get_random_u8() is used, which wastes fewer batched random bytes, and hence has higher throughput. - By using prandom_u32_max() instead of %, when the upper-bound is not a constant, division is still avoided, because prandom_u32_max() uses a faster multiplication-based trick instead. - By using get_random_u16() or get_random_u8() in cases where the return value is intended to indeed be a u16 or a u8, we waste fewer batched random bytes, and hence have higher throughput. So, based on those rules and benefits from following them, this patchset breaks down into the following five steps: 1) Replace `prandom_u32() % max` and variants thereof with prandom_u32_max(max). * Part 1 is done with Coccinelle. Part 2 is done by hand. 2) Replace `(type)get_random_u32()` and variants thereof with get_random_u16() or get_random_u8(). I took the pains to actually look and see what every lvalue type was across the entire tree. * Part 1 is done with Coccinelle. Part 2 is done by hand. 3) Replace remaining deprecated uses of prandom_u32() and get_random_int() with get_random_u32(). * A boring search and replace operation. 4) Replace remaining deprecated uses of prandom_bytes() with get_random_bytes(). * A boring search and replace operation. 5) Remove the deprecated and now-unused prandom_u32() and prandom_bytes() inline wrapper functions. * Just deleting code and updating comments. I was thinking of taking this through my random.git tree (on which this series is currently based) and submitting it near the end of the merge window, or waiting for the very end of the 6.1 cycle when there will be the fewest new patches brewing. If somebody with some treewide-cleanup experience might share some wisdom about what the best timing usually winds up being, I'm all ears. Please take a look! The number of lines touched is quite small, so this should be reviewable, and as much as is possible has been pushed into Coccinelle scripts. Thanks, Jason Cc: Andreas Noever Cc: Andrew Morton Cc: Andy Shevchenko Cc: Borislav Petkov Cc: Catalin Marinas Cc: Christoph Böhmwalder Cc: Christoph Hellwig Cc: Christophe Leroy Cc: Daniel Borkmann Cc: Dave Airlie Cc: Dave Hansen Cc: David S. Miller Cc: Eric Dumazet Cc: Florian Westphal Cc: Greg Kroah-Hartman , Cc: H. Peter Anvin Cc: Heiko Carstens Cc: Helge Deller Cc: Herbert Xu Cc: Huacai Chen Cc: Hugh Dickins Cc: Jakub Kicinski Cc: James E.J. Bottomley Cc: Jan Kara Cc: Jason Gunthorpe Cc: Jens Axboe Cc: Johannes Berg Cc: Jonathan Corbet Cc: Jozsef Kadlecsik Cc: KP Singh Cc: Kees Cook Cc: Marco Elver Cc: Mauro Carvalho Chehab Cc: Michael Ellerman Cc: Pablo Neira Ayuso Cc: Paolo Abeni Cc: Peter Zijlstra Cc: Richard Weinberger Cc: Russell King Cc: Theodore Ts'o Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Thomas Graf Cc: Ulf Hansson Cc: Vignesh Raghavendra Cc: WANG Xuerui Cc: Will Deacon Cc: Yury Norov Cc: dri-devel@lists.freedesktop.org Cc: kasan-dev@googlegroups.com Cc: kernel-janitors@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-block@vger.kernel.org Cc: linux-crypto@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: linux-mips@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-mmc@vger.kernel.org Cc: linux-mtd@lists.infradead.org Cc: linux-nvme@lists.infradead.org Cc: linux-parisc@vger.kernel.org Cc: linux-rdma@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linux-um@lists.infradead.org Cc: linux-usb@vger.kernel.org Cc: linux-wireless@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: loongarch@lists.linux.dev Cc: netdev@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: x86@kernel.org Jason A. Donenfeld (7): treewide: use prandom_u32_max() when possible, part 1 treewide: use prandom_u32_max() when possible, part 2 treewide: use get_random_{u8,u16}() when possible, part 1 treewide: use get_random_{u8,u16}() when possible, part 2 treewide: use get_random_u32() when possible treewide: use get_random_bytes when possible prandom: remove unused functions Documentation/networking/filter.rst | 2 +- arch/arm/kernel/process.c | 2 +- arch/arm/kernel/signal.c | 2 +- arch/arm64/kernel/process.c | 2 +- arch/arm64/kernel/syscall.c | 2 +- arch/loongarch/kernel/process.c | 2 +- arch/loongarch/kernel/vdso.c | 2 +- arch/mips/kernel/process.c | 2 +- arch/mips/kernel/vdso.c | 2 +- arch/parisc/kernel/process.c | 2 +- arch/parisc/kernel/sys_parisc.c | 4 +- arch/parisc/kernel/vdso.c | 2 +- arch/powerpc/crypto/crc-vpmsum_test.c | 2 +- arch/powerpc/kernel/process.c | 2 +- arch/s390/kernel/process.c | 4 +- arch/s390/kernel/vdso.c | 2 +- arch/s390/mm/mmap.c | 2 +- arch/sparc/vdso/vma.c | 2 +- arch/um/kernel/process.c | 2 +- arch/x86/entry/vdso/vma.c | 2 +- arch/x86/kernel/cpu/amd.c | 2 +- arch/x86/kernel/module.c | 2 +- arch/x86/kernel/process.c | 2 +- arch/x86/mm/pat/cpa-test.c | 4 +- block/blk-crypto-fallback.c | 2 +- crypto/async_tx/raid6test.c | 2 +- crypto/testmgr.c | 94 +++++++++---------- drivers/block/drbd/drbd_receiver.c | 4 +- drivers/char/random.c | 11 +-- drivers/dma/dmatest.c | 2 +- .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 2 +- drivers/gpu/drm/i915/i915_gem_gtt.c | 6 +- .../gpu/drm/i915/selftests/i915_selftest.c | 2 +- drivers/gpu/drm/selftests/test-drm_buddy.c | 2 +- drivers/gpu/drm/selftests/test-drm_mm.c | 2 +- drivers/infiniband/core/cma.c | 2 +- drivers/infiniband/hw/cxgb4/cm.c | 4 +- drivers/infiniband/hw/cxgb4/id_table.c | 4 +- drivers/infiniband/hw/hfi1/tid_rdma.c | 2 +- drivers/infiniband/hw/hns/hns_roce_ah.c | 5 +- drivers/infiniband/hw/mlx4/mad.c | 2 +- drivers/infiniband/ulp/ipoib/ipoib_cm.c | 2 +- drivers/infiniband/ulp/rtrs/rtrs-clt.c | 3 +- drivers/md/bcache/request.c | 2 +- drivers/md/raid5-cache.c | 2 +- drivers/media/common/v4l2-tpg/v4l2-tpg-core.c | 2 +- .../media/test-drivers/vivid/vivid-radio-rx.c | 4 +- .../test-drivers/vivid/vivid-touch-cap.c | 6 +- drivers/misc/habanalabs/gaudi2/gaudi2.c | 2 +- drivers/mmc/core/core.c | 4 +- drivers/mmc/host/dw_mmc.c | 2 +- drivers/mtd/nand/raw/nandsim.c | 8 +- drivers/mtd/tests/mtd_nandecctest.c | 12 +-- drivers/mtd/tests/speedtest.c | 2 +- drivers/mtd/tests/stresstest.c | 19 +--- drivers/mtd/ubi/debug.c | 2 +- drivers/mtd/ubi/debug.h | 6 +- drivers/net/bonding/bond_main.c | 2 +- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +- drivers/net/ethernet/broadcom/cnic.c | 5 +- .../chelsio/inline_crypto/chtls/chtls_cm.c | 4 +- .../chelsio/inline_crypto/chtls/chtls_io.c | 4 +- drivers/net/ethernet/rocker/rocker_main.c | 8 +- drivers/net/hamradio/baycom_epp.c | 2 +- drivers/net/hamradio/hdlcdrv.c | 2 +- drivers/net/hamradio/yam.c | 2 +- drivers/net/phy/at803x.c | 2 +- drivers/net/wireguard/selftest/allowedips.c | 16 ++-- .../broadcom/brcm80211/brcmfmac/p2p.c | 2 +- .../broadcom/brcm80211/brcmfmac/pno.c | 2 +- .../net/wireless/intel/iwlwifi/mvm/mac-ctxt.c | 2 +- .../net/wireless/marvell/mwifiex/cfg80211.c | 4 +- .../wireless/microchip/wilc1000/cfg80211.c | 2 +- .../net/wireless/quantenna/qtnfmac/cfg80211.c | 2 +- drivers/net/wireless/st/cw1200/wsm.c | 2 +- drivers/net/wireless/ti/wlcore/main.c | 2 +- drivers/nvme/common/auth.c | 2 +- drivers/scsi/cxgbi/cxgb4i/cxgb4i.c | 4 +- drivers/scsi/fcoe/fcoe_ctlr.c | 4 +- drivers/scsi/lpfc/lpfc_hbadisc.c | 6 +- drivers/scsi/qedi/qedi_main.c | 2 +- drivers/target/iscsi/cxgbit/cxgbit_cm.c | 2 +- drivers/thunderbolt/xdomain.c | 2 +- drivers/video/fbdev/uvesafb.c | 2 +- fs/ceph/inode.c | 2 +- fs/ceph/mdsmap.c | 2 +- fs/exfat/inode.c | 2 +- fs/ext2/ialloc.c | 3 +- fs/ext4/ialloc.c | 7 +- fs/ext4/ioctl.c | 4 +- fs/ext4/mmp.c | 2 +- fs/ext4/super.c | 7 +- fs/f2fs/gc.c | 2 +- fs/f2fs/namei.c | 2 +- fs/f2fs/segment.c | 8 +- fs/fat/inode.c | 2 +- fs/nfsd/nfs4state.c | 4 +- fs/ntfs3/fslog.c | 6 +- fs/ubifs/debug.c | 10 +- fs/ubifs/journal.c | 2 +- fs/ubifs/lpt_commit.c | 14 +-- fs/ubifs/tnc_commit.c | 2 +- fs/xfs/libxfs/xfs_alloc.c | 2 +- fs/xfs/libxfs/xfs_ialloc.c | 4 +- fs/xfs/xfs_error.c | 2 +- fs/xfs/xfs_icache.c | 2 +- fs/xfs/xfs_log.c | 2 +- include/linux/nodemask.h | 2 +- include/linux/prandom.h | 12 --- include/linux/random.h | 5 - include/net/netfilter/nf_queue.h | 2 +- include/net/red.h | 2 +- include/net/sock.h | 2 +- kernel/bpf/bloom_filter.c | 2 +- kernel/bpf/core.c | 6 +- kernel/bpf/hashtab.c | 2 +- kernel/bpf/verifier.c | 2 +- kernel/kcsan/selftest.c | 4 +- kernel/locking/test-ww_mutex.c | 4 +- kernel/time/clocksource.c | 2 +- lib/cmdline_kunit.c | 4 +- lib/fault-inject.c | 2 +- lib/find_bit_benchmark.c | 4 +- lib/kobject.c | 2 +- lib/random32.c | 4 +- lib/reed_solomon/test_rslib.c | 12 +-- lib/sbitmap.c | 4 +- lib/test-string_helpers.c | 2 +- lib/test_fprobe.c | 2 +- lib/test_hexdump.c | 10 +- lib/test_kasan.c | 6 +- lib/test_kprobes.c | 2 +- lib/test_list_sort.c | 2 +- lib/test_min_heap.c | 6 +- lib/test_objagg.c | 2 +- lib/test_rhashtable.c | 6 +- lib/test_vmalloc.c | 19 +--- lib/uuid.c | 2 +- mm/migrate.c | 2 +- mm/shmem.c | 2 +- mm/slab.c | 2 +- mm/slub.c | 2 +- net/802/garp.c | 2 +- net/802/mrp.c | 2 +- net/ceph/mon_client.c | 2 +- net/ceph/osd_client.c | 2 +- net/core/neighbour.c | 2 +- net/core/pktgen.c | 47 +++++----- net/core/stream.c | 2 +- net/dccp/ipv4.c | 4 +- net/ipv4/datagram.c | 2 +- net/ipv4/igmp.c | 6 +- net/ipv4/inet_connection_sock.c | 2 +- net/ipv4/inet_hashtables.c | 2 +- net/ipv4/ip_output.c | 2 +- net/ipv4/route.c | 4 +- net/ipv4/tcp_cdg.c | 2 +- net/ipv4/tcp_ipv4.c | 4 +- net/ipv4/udp.c | 2 +- net/ipv6/addrconf.c | 8 +- net/ipv6/ip6_flowlabel.c | 2 +- net/ipv6/mcast.c | 10 +- net/ipv6/output_core.c | 2 +- net/mac80211/rc80211_minstrel_ht.c | 2 +- net/mac80211/scan.c | 2 +- net/netfilter/ipvs/ip_vs_conn.c | 2 +- net/netfilter/ipvs/ip_vs_twos.c | 4 +- net/netfilter/nf_nat_core.c | 4 +- net/netfilter/xt_statistic.c | 2 +- net/openvswitch/actions.c | 2 +- net/packet/af_packet.c | 2 +- net/rds/bind.c | 2 +- net/sched/act_gact.c | 2 +- net/sched/act_sample.c | 2 +- net/sched/sch_cake.c | 8 +- net/sched/sch_netem.c | 22 ++--- net/sched/sch_pie.c | 2 +- net/sched/sch_sfb.c | 2 +- net/sctp/socket.c | 4 +- net/sunrpc/auth_gss/gss_krb5_wrap.c | 4 +- net/sunrpc/cache.c | 2 +- net/sunrpc/xprt.c | 2 +- net/sunrpc/xprtsock.c | 2 +- net/tipc/socket.c | 2 +- net/unix/af_unix.c | 2 +- net/xfrm/xfrm_state.c | 2 +- 186 files changed, 379 insertions(+), 422 deletions(-) Reviewed-by: Greg Kroah-Hartman Reviewed-by: Yury Norov