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Message-ID: <20200604104549.GC8834@unreal>
Date: Thu, 4 Jun 2020 13:45:49 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: linux-kernel@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
Alexander Potapenko <glider@...gle.com>,
Joe Perches <joe@...ches.com>,
Andy Whitcroft <apw@...onical.com>, x86@...nel.org,
drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
b43-dev@...ts.infradead.org, netdev@...r.kernel.org,
linux-wireless@...r.kernel.org, linux-ide@...r.kernel.org,
linux-clk@...r.kernel.org, linux-spi@...r.kernel.org,
linux-mm@...ck.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH 09/10] treewide: Remove uninitialized_var() usage
On Wed, Jun 03, 2020 at 04:32:02PM -0700, Kees Cook wrote:
> Using uninitialized_var() is dangerous as it papers over real bugs[1]
> (or can in the future), and suppresses unrelated compiler warnings
> (e.g. "unused variable"). If the compiler thinks it is uninitialized,
> either simply initialize the variable or make compiler changes.
>
> I preparation for removing[2] the[3] macro[4], remove all remaining
> needless uses with the following script:
>
> git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \
> xargs perl -pi -e \
> 's/\buninitialized_var\(([^\)]+)\)/\1/g;
> s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;'
>
> drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid
> pathological white-space.
>
> No outstanding warnings were found building allmodconfig with GCC 9.3.0
> for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64,
> alpha, and m68k.
>
> [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
> [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
> [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
> [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> arch/arm/mach-sa1100/assabet.c | 2 +-
> arch/arm/mm/alignment.c | 2 +-
> arch/ia64/kernel/process.c | 2 +-
> arch/ia64/mm/discontig.c | 2 +-
> arch/ia64/mm/tlb.c | 2 +-
> arch/mips/lib/dump_tlb.c | 2 +-
> arch/mips/mm/init.c | 2 +-
> arch/mips/mm/tlb-r4k.c | 6 +++---
> arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +-
> arch/powerpc/kvm/book3s_pr.c | 2 +-
> arch/powerpc/kvm/powerpc.c | 2 +-
> arch/powerpc/platforms/52xx/mpc52xx_pic.c | 2 +-
> arch/s390/kernel/smp.c | 2 +-
> arch/x86/kernel/quirks.c | 10 +++++-----
> arch/x86/kvm/mmu/mmu.c | 2 +-
> arch/x86/kvm/mmu/paging_tmpl.h | 2 +-
> arch/x86/kvm/x86.c | 2 +-
> block/blk-merge.c | 2 +-
> drivers/acpi/acpi_pad.c | 2 +-
> drivers/ata/libata-scsi.c | 2 +-
> drivers/atm/zatm.c | 2 +-
> drivers/block/drbd/drbd_nl.c | 6 +++---
> drivers/block/rbd.c | 2 +-
> drivers/clk/clk-gate.c | 2 +-
> drivers/clk/spear/clk-vco-pll.c | 2 +-
> drivers/crypto/nx/nx-842-powernv.c | 2 +-
> drivers/firewire/ohci.c | 14 +++++++-------
> drivers/gpu/drm/bridge/sil-sii8620.c | 2 +-
> drivers/gpu/drm/drm_edid.c | 2 +-
> drivers/gpu/drm/exynos/exynos_drm_dsi.c | 6 +++---
> drivers/gpu/drm/i915/display/intel_fbc.c | 2 +-
> drivers/gpu/drm/i915/gt/intel_lrc.c | 2 +-
> drivers/gpu/drm/i915/intel_uncore.c | 2 +-
> drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 4 ++--
> drivers/i2c/busses/i2c-rk3x.c | 2 +-
> drivers/ide/ide-acpi.c | 2 +-
> drivers/ide/ide-atapi.c | 2 +-
> drivers/ide/ide-io-std.c | 4 ++--
> drivers/ide/ide-io.c | 8 ++++----
> drivers/ide/ide-sysfs.c | 2 +-
> drivers/ide/umc8672.c | 2 +-
> drivers/idle/intel_idle.c | 2 +-
> drivers/infiniband/core/uverbs_cmd.c | 4 ++--
> drivers/infiniband/hw/cxgb4/cm.c | 2 +-
> drivers/infiniband/hw/cxgb4/cq.c | 2 +-
> drivers/infiniband/hw/mlx4/qp.c | 6 +++---
> drivers/infiniband/hw/mlx5/cq.c | 6 +++---
> drivers/infiniband/hw/mlx5/devx.c | 2 +-
> drivers/infiniband/hw/mlx5/qp.c | 2 +-
> drivers/infiniband/hw/mthca/mthca_qp.c | 10 +++++-----
> drivers/infiniband/sw/siw/siw_qp_rx.c | 2 +-
> drivers/input/serio/serio_raw.c | 2 +-
> drivers/input/touchscreen/sur40.c | 2 +-
> drivers/iommu/intel-iommu.c | 2 +-
> drivers/md/dm-io.c | 2 +-
> drivers/md/dm-ioctl.c | 2 +-
> drivers/md/dm-snap-persistent.c | 2 +-
> drivers/md/dm-table.c | 2 +-
> drivers/md/dm-writecache.c | 2 +-
> drivers/md/raid5.c | 2 +-
> drivers/media/dvb-frontends/rtl2832.c | 2 +-
> drivers/media/tuners/qt1010.c | 4 ++--
> drivers/media/usb/gspca/vicam.c | 2 +-
> drivers/media/usb/uvc/uvc_video.c | 8 ++++----
> drivers/memstick/host/jmb38x_ms.c | 2 +-
> drivers/memstick/host/tifm_ms.c | 2 +-
> drivers/mmc/host/sdhci.c | 2 +-
> drivers/mtd/nand/raw/nand_ecc.c | 2 +-
> drivers/mtd/nand/raw/s3c2410.c | 2 +-
> drivers/mtd/parsers/afs.c | 4 ++--
> drivers/mtd/ubi/eba.c | 2 +-
> drivers/net/can/janz-ican3.c | 2 +-
> drivers/net/ethernet/broadcom/bnx2.c | 4 ++--
> .../net/ethernet/mellanox/mlx5/core/pagealloc.c | 4 ++--
> drivers/net/ethernet/neterion/s2io.c | 2 +-
> drivers/net/ethernet/qlogic/qla3xxx.c | 2 +-
> drivers/net/ethernet/sun/cassini.c | 2 +-
> drivers/net/ethernet/sun/niu.c | 6 +++---
> drivers/net/wan/z85230.c | 2 +-
> drivers/net/wireless/ath/ath10k/core.c | 2 +-
> drivers/net/wireless/ath/ath6kl/init.c | 2 +-
> drivers/net/wireless/ath/ath9k/init.c | 2 +-
> drivers/net/wireless/broadcom/b43/debugfs.c | 2 +-
> drivers/net/wireless/broadcom/b43/dma.c | 2 +-
> drivers/net/wireless/broadcom/b43/lo.c | 2 +-
> drivers/net/wireless/broadcom/b43/phy_n.c | 2 +-
> drivers/net/wireless/broadcom/b43/xmit.c | 12 ++++++------
> .../net/wireless/broadcom/b43legacy/debugfs.c | 2 +-
> drivers/net/wireless/broadcom/b43legacy/main.c | 2 +-
> drivers/net/wireless/intel/iwlegacy/3945.c | 2 +-
> drivers/net/wireless/intel/iwlegacy/4965-mac.c | 2 +-
> .../net/wireless/realtek/rtlwifi/rtl8192cu/hw.c | 4 ++--
> drivers/pci/pcie/aer.c | 2 +-
> drivers/platform/x86/hdaps.c | 4 ++--
> drivers/scsi/dc395x.c | 2 +-
> drivers/scsi/pm8001/pm8001_hwi.c | 2 +-
> drivers/scsi/pm8001/pm80xx_hwi.c | 2 +-
> drivers/ssb/driver_chipcommon.c | 4 ++--
> drivers/tty/cyclades.c | 2 +-
> drivers/tty/isicom.c | 2 +-
> drivers/usb/musb/cppi_dma.c | 2 +-
> drivers/usb/storage/sddr55.c | 4 ++--
> drivers/vhost/net.c | 6 +++---
> drivers/video/fbdev/matrox/matroxfb_maven.c | 6 +++---
> drivers/video/fbdev/pm3fb.c | 6 +++---
> drivers/video/fbdev/riva/riva_hw.c | 3 +--
> drivers/virtio/virtio_ring.c | 6 +++---
> fs/afs/dir.c | 2 +-
> fs/afs/security.c | 2 +-
> fs/dlm/netlink.c | 2 +-
> fs/erofs/data.c | 4 ++--
> fs/erofs/zdata.c | 2 +-
> fs/f2fs/data.c | 2 +-
> fs/fat/dir.c | 2 +-
> fs/fuse/control.c | 4 ++--
> fs/fuse/cuse.c | 2 +-
> fs/fuse/file.c | 2 +-
> fs/gfs2/aops.c | 2 +-
> fs/gfs2/bmap.c | 2 +-
> fs/gfs2/lops.c | 2 +-
> fs/hfsplus/unicode.c | 2 +-
> fs/isofs/namei.c | 4 ++--
> fs/jffs2/erase.c | 2 +-
> fs/nfsd/nfsctl.c | 2 +-
> fs/ocfs2/alloc.c | 4 ++--
> fs/ocfs2/dir.c | 14 +++++++-------
> fs/ocfs2/extent_map.c | 4 ++--
> fs/ocfs2/namei.c | 2 +-
> fs/ocfs2/refcounttree.c | 2 +-
> fs/ocfs2/xattr.c | 2 +-
> fs/omfs/file.c | 2 +-
> fs/overlayfs/copy_up.c | 4 ++--
> fs/ubifs/commit.c | 6 +++---
> fs/ubifs/dir.c | 2 +-
> fs/ubifs/file.c | 4 ++--
> fs/ubifs/journal.c | 4 ++--
> fs/ubifs/lpt.c | 2 +-
> fs/ubifs/tnc.c | 6 +++---
> fs/ubifs/tnc_misc.c | 4 ++--
> fs/udf/balloc.c | 2 +-
> fs/xfs/xfs_bmap_util.c | 2 +-
> include/net/flow_offload.h | 2 +-
> kernel/async.c | 4 ++--
> kernel/audit.c | 2 +-
> kernel/debug/kdb/kdb_io.c | 2 +-
> kernel/dma/debug.c | 2 +-
> kernel/events/core.c | 2 +-
> kernel/events/uprobes.c | 2 +-
> kernel/exit.c | 2 +-
> kernel/futex.c | 14 +++++++-------
> kernel/locking/lockdep.c | 16 ++++++++--------
> kernel/trace/ring_buffer.c | 2 +-
> lib/radix-tree.c | 2 +-
> lib/test_lockup.c | 2 +-
> mm/frontswap.c | 2 +-
> mm/ksm.c | 2 +-
> mm/memcontrol.c | 2 +-
> mm/memory.c | 2 +-
> mm/mempolicy.c | 4 ++--
> mm/page_alloc.c | 2 +-
> mm/percpu.c | 2 +-
> mm/slub.c | 4 ++--
> mm/swap.c | 4 ++--
> net/dccp/options.c | 2 +-
> net/ipv4/netfilter/nf_socket_ipv4.c | 6 +++---
> net/ipv6/ip6_flowlabel.c | 2 +-
> net/ipv6/netfilter/nf_socket_ipv6.c | 2 +-
> net/netfilter/nf_conntrack_ftp.c | 2 +-
> net/netfilter/nfnetlink_log.c | 2 +-
> net/netfilter/nfnetlink_queue.c | 4 ++--
> net/sched/cls_flow.c | 2 +-
> net/sched/sch_cake.c | 2 +-
> net/sched/sch_cbq.c | 2 +-
> net/sched/sch_fq_codel.c | 2 +-
> net/sched/sch_fq_pie.c | 2 +-
> net/sched/sch_hfsc.c | 2 +-
> net/sched/sch_htb.c | 2 +-
> net/sched/sch_sfq.c | 2 +-
> net/sunrpc/svcsock.c | 4 ++--
> net/sunrpc/xprtsock.c | 10 +++++-----
> net/tls/tls_sw.c | 2 +-
> sound/core/control_compat.c | 2 +-
> sound/isa/sb/sb16_csp.c | 2 +-
> sound/usb/endpoint.c | 2 +-
> 184 files changed, 284 insertions(+), 285 deletions(-)
Thanks,
Reviewed-by: Leon Romanovsky <leonro@...lanox.com> # drivers/infiniband and mlx4/mlx5
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