March 2020 - Linux-stable-mirror

[PATCH] kernel/printk: add kmsg SEEK_CUR handling

by Bruno Meneguele

Userspace libraries, e.g. glibc's dprintf(), expect the default return value for invalid seek situations: -ESPIPE, but when the IO was over /dev/kmsg the current state of kernel code was returning the generic case of an -EINVAL. Hence, userspace programs were not behaving as expected or documented. With this patch we add SEEK_CUR case returning the expected value and also a simple mention of it in kernel's documentation for those relying on that for guidance. Signed-off-by: Bruno Meneguele <bmeneg(a)redhat.com> --- Documentation/ABI/testing/dev-kmsg | 2 ++ kernel/printk/printk.c | 4 ++++ 2 files changed, 6 insertions(+) diff --git a/Documentation/ABI/testing/dev-kmsg b/Documentation/ABI/testing/dev-kmsg index f307506eb54c..8533d28e6fda 100644 --- a/Documentation/ABI/testing/dev-kmsg +++ b/Documentation/ABI/testing/dev-kmsg @@ -56,6 +56,8 @@ Description: The /dev/kmsg character device node provides userspace access seek after the last record available at the time the last SYSLOG_ACTION_CLEAR was issued. + While SEEK_CUR sets -ESPIPE (invalid seek) to errno. + The output format consists of a prefix carrying the syslog prefix including priority and facility, the 64 bit message sequence number and the monotonic timestamp in microseconds, diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index ad4606234545..d02606723d2d 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -963,6 +963,10 @@ static loff_t devkmsg_llseek(struct file *file, loff_t offset, int whence) user->idx = log_next_idx; user->seq = log_next_seq; break; + case SEEK_CUR: + /* return the default errno for invalid seek */ + ret = -ESPIPE; + break; default: ret = -EINVAL; } -- 2.24.1

4 years, 7 months

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[PATCH 4.19 00/89] 4.19.111-rc1 review

by Greg Kroah-Hartman

This is the start of the stable review cycle for the 4.19.111 release. There are 89 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know. Responses should be made by Thu, 19 Mar 2020 10:31:16 +0000. Anything received after that time might be too late. The whole patch series can be found in one patch at: https://www.kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.19.111-r… or in the git tree and branch at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y and the diffstat can be found below. thanks, greg k-h ------------- Pseudo-Shortlog of commits: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Linux 4.19.111-rc1 Sven Eckelmann <sven(a)narfation.org> batman-adv: Avoid free/alloc race when handling OGM2 buffer Vladis Dronov <vdronov(a)redhat.com> efi: Add a sanity check to efivar_store_raw() Karsten Graul <kgraul(a)linux.ibm.com> net/smc: cancel event worker during device removal Karsten Graul <kgraul(a)linux.ibm.com> net/smc: check for valid ib_client_data Eric Dumazet <edumazet(a)google.com> ipv6: restrict IPV6_ADDRFORM operation Wolfram Sang <wsa+renesas(a)sang-engineering.com> i2c: acpi: put device when verifying client fails Daniel Drake <drake(a)endlessm.com> iommu/vt-d: Ignore devices with out-of-spec domain number Zhenzhong Duan <zhenzhong.duan(a)gmail.com> iommu/vt-d: Fix the wrong printing in RHSA parsing Jakub Kicinski <kuba(a)kernel.org> netfilter: nft_tunnel: add missing attribute validation for tunnels Jakub Kicinski <kuba(a)kernel.org> netfilter: nft_payload: add missing attribute validation for payload csum flags Jakub Kicinski <kuba(a)kernel.org> netfilter: cthelper: add missing attribute validation for cthelper Tommi Rantala <tommi.t.rantala(a)nokia.com> perf bench futex-wake: Restore thread count default to online CPU count Jakub Kicinski <kuba(a)kernel.org> nl80211: add missing attribute validation for channel switch Jakub Kicinski <kuba(a)kernel.org> nl80211: add missing attribute validation for beacon report scanning Jakub Kicinski <kuba(a)kernel.org> nl80211: add missing attribute validation for critical protocol indication Hamish Martin <hamish.martin(a)alliedtelesis.co.nz> i2c: gpio: suppress error on probe defer Zhenyu Wang <zhenyuw(a)linux.intel.com> drm/i915/gvt: Fix unnecessary schedule timer when no vGPU exits Charles Keepax <ckeepax(a)opensource.cirrus.com> pinctrl: core: Remove extra kref_get which blocks hogs being freed Nicolas Belin <nbelin(a)baylibre.com> pinctrl: meson-gxl: fix GPIOX sdio pins Sven Eckelmann <sven(a)narfation.org> batman-adv: Don't schedule OGM for disabled interface Yonghyun Hwang <yonghyun(a)google.com> iommu/vt-d: Fix a bug in intel_iommu_iova_to_phys() for huge page Hans de Goede <hdegoede(a)redhat.com> iommu/vt-d: dmar: replace WARN_TAINT with pr_warn + add_taint Marc Zyngier <maz(a)kernel.org> iommu/dma: Fix MSI reservation allocation Tony Luck <tony.luck(a)intel.com> x86/mce: Fix logic and comments around MSR_PPIN_CTL Felix Fietkau <nbd(a)nbd.name> mt76: fix array overflow on receiving too many fragments for a packet Sai Praneeth <sai.praneeth.prakhya(a)intel.com> efi: Make efi_rts_work accessible to efi page fault handler Vladis Dronov <vdronov(a)redhat.com> efi: Fix a race and a buffer overflow while reading efivars via sysfs Wolfram Sang <wsa(a)the-dreams.de> macintosh: windfarm: fix MODINFO regression Eugeniy Paltsev <Eugeniy.Paltsev(a)synopsys.com> ARC: define __ALIGN_STR and __ALIGN symbols for ARC Vitaly Kuznetsov <vkuznets(a)redhat.com> KVM: x86: clear stale x86_emulate_ctxt->intercept value Al Viro <viro(a)zeniv.linux.org.uk> gfs2_atomic_open(): fix O_EXCL|O_CREAT handling on cold dcache Al Viro <viro(a)zeniv.linux.org.uk> cifs_atomic_open(): fix double-put on late allocation failure Steven Rostedt (VMware) <rostedt(a)goodmis.org> ktest: Add timeout for ssh sync testing Colin Ian King <colin.king(a)canonical.com> drm/amd/display: remove duplicated assignment to grph_obj_type Hillf Danton <hdanton(a)sina.com> workqueue: don't use wq_select_unbound_cpu() for bound works Vasily Averin <vvs(a)virtuozzo.com> netfilter: x_tables: xt_mttg_seq_next should increase position index Vasily Averin <vvs(a)virtuozzo.com> netfilter: xt_recent: recent_seq_next should increase position index Vasily Averin <vvs(a)virtuozzo.com> netfilter: synproxy: synproxy_cpu_seq_next should increase position index Vasily Averin <vvs(a)virtuozzo.com> netfilter: nf_conntrack: ct_cpu_seq_next should increase position index Hans de Goede <hdegoede(a)redhat.com> iommu/vt-d: quirk_ioat_snb_local_iommu: replace WARN_TAINT with pr_warn + add_taint Halil Pasic <pasic(a)linux.ibm.com> virtio-blk: fix hw_queue stopped on arbitrary error Dan Moulding <dmoulding(a)me.com> iwlwifi: mvm: Do not require PHY_SKU NVM section for 3168 devices Michal Koutný <mkoutny(a)suse.com> cgroup: Iterate tasks that did not finish do_exit() Vasily Averin <vvs(a)virtuozzo.com> cgroup: cgroup_procs_next should increase position index Mahesh Bandewar <maheshb(a)google.com> macvlan: add cond_resched() during multicast processing Jakub Kicinski <kuba(a)kernel.org> net: fec: validate the new settings in fec_enet_set_coalesce() Eric Dumazet <edumazet(a)google.com> slip: make slhc_compress() more robust against malicious packets Eric Dumazet <edumazet(a)google.com> bonding/alb: make sure arp header is pulled before accessing it Jakub Kicinski <kuba(a)kernel.org> devlink: validate length of region addr/len Jakub Kicinski <kuba(a)kernel.org> tipc: add missing attribute validation for MTU property Hangbin Liu <liuhangbin(a)gmail.com> net/ipv6: remove the old peer route if change it to a new one Hangbin Liu <liuhangbin(a)gmail.com> net/ipv6: need update peer route when modify metric Hangbin Liu <liuhangbin(a)gmail.com> selftests/net/fib_tests: update addr_metric_test for peer route testing Heiner Kallweit <hkallweit1(a)gmail.com> net: phy: fix MDIO bus PM PHY resuming Jakub Kicinski <kuba(a)kernel.org> nfc: add missing attribute validation for vendor subcommand Jakub Kicinski <kuba(a)kernel.org> nfc: add missing attribute validation for deactivate target Jakub Kicinski <kuba(a)kernel.org> nfc: add missing attribute validation for SE API Jakub Kicinski <kuba(a)kernel.org> team: add missing attribute validation for array index Jakub Kicinski <kuba(a)kernel.org> team: add missing attribute validation for port ifindex Jakub Kicinski <kuba(a)kernel.org> net: fq: add missing attribute validation for orphan mask Jakub Kicinski <kuba(a)kernel.org> macsec: add missing attribute validation for port Jakub Kicinski <kuba(a)kernel.org> can: add missing attribute validation for termination Jakub Kicinski <kuba(a)kernel.org> nl802154: add missing attribute validation for dev_type Jakub Kicinski <kuba(a)kernel.org> nl802154: add missing attribute validation Jakub Kicinski <kuba(a)kernel.org> fib: add missing attribute validation for tun_id Jakub Kicinski <kuba(a)kernel.org> devlink: validate length of param values Eric Dumazet <edumazet(a)google.com> net: memcg: fix lockdep splat in inet_csk_accept() Shakeel Butt <shakeelb(a)google.com> net: memcg: late association of sock to memcg Shakeel Butt <shakeelb(a)google.com> cgroup: memcg: net: do not associate sock with unrelated cgroup Vasundhara Volam <vasundhara-v.volam(a)broadcom.com> bnxt_en: reinitialize IRQs when MTU is modified Edward Cree <ecree(a)solarflare.com> sfc: detach from cb_page in efx_copy_channel() You-Sheng Yang <vicamo.yang(a)canonical.com> r8152: check disconnect status after long sleep Colin Ian King <colin.king(a)canonical.com> net: systemport: fix index check to avoid an array out of bounds access Remi Pommarel <repk(a)triplefau.lt> net: stmmac: dwmac1000: Disable ACS if enhanced descs are not used Willem de Bruijn <willemb(a)google.com> net/packet: tpacket_rcv: do not increment ring index on drop Dan Carpenter <dan.carpenter(a)oracle.com> net: nfc: fix bounds checking bugs on "pipe" Dmitry Bogdanov <dbogdanov(a)marvell.com> net: macsec: update SCI upon MAC address change. Pablo Neira Ayuso <pablo(a)netfilter.org> netlink: Use netlink header as base to calculate bad attribute offset Hangbin Liu <liuhangbin(a)gmail.com> net/ipv6: use configured metric when add peer route Mahesh Bandewar <maheshb(a)google.com> ipvlan: don't deref eth hdr before checking it's set Eric Dumazet <edumazet(a)google.com> ipvlan: do not use cond_resched_rcu() in ipvlan_process_multicast() Jiri Wiesner <jwiesner(a)suse.com> ipvlan: do not add hardware address of master to its unicast filter list Mahesh Bandewar <maheshb(a)google.com> ipvlan: add cond_resched_rcu() while processing muticast backlog Hangbin Liu <liuhangbin(a)gmail.com> ipv6/addrconf: call ipv6_mc_up() for non-Ethernet interface Dmitry Yakunin <zeil(a)yandex-team.ru> inet_diag: return classid for all socket types Eric Dumazet <edumazet(a)google.com> gre: fix uninit-value in __iptunnel_pull_header Dmitry Yakunin <zeil(a)yandex-team.ru> cgroup, netclassid: periodically release file_lock on classid updating Florian Fainelli <f.fainelli(a)gmail.com> net: phy: Avoid multiple suspends David S. Miller <davem(a)davemloft.net> phy: Revert toggling reset changes. ------------- Diffstat: Documentation/filesystems/porting | 7 +++ Makefile | 4 +- arch/arc/include/asm/linkage.h | 2 + arch/x86/kernel/cpu/mcheck/mce_intel.c | 9 ++-- arch/x86/kvm/emulate.c | 1 + drivers/block/virtio_blk.c | 8 ++-- drivers/firmware/efi/efivars.c | 32 +++++++++---- drivers/firmware/efi/runtime-wrappers.c | 53 ++++------------------ drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 3 +- drivers/gpu/drm/i915/gvt/vgpu.c | 12 +++-- drivers/i2c/busses/i2c-gpio.c | 2 +- drivers/i2c/i2c-core-acpi.c | 10 +++- drivers/iommu/dma-iommu.c | 16 +++---- drivers/iommu/dmar.c | 21 ++++++--- drivers/iommu/intel-iommu.c | 13 ++++-- drivers/macintosh/windfarm_ad7417_sensor.c | 7 +++ drivers/macintosh/windfarm_fcu_controls.c | 7 +++ drivers/macintosh/windfarm_lm75_sensor.c | 16 ++++++- drivers/macintosh/windfarm_lm87_sensor.c | 7 +++ drivers/macintosh/windfarm_max6690_sensor.c | 7 +++ drivers/macintosh/windfarm_smu_sat.c | 7 +++ drivers/net/bonding/bond_alb.c | 20 ++++---- drivers/net/can/dev.c | 1 + drivers/net/ethernet/broadcom/bcmsysport.c | 2 +- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 4 +- drivers/net/ethernet/freescale/fec_main.c | 6 +-- drivers/net/ethernet/sfc/efx.c | 1 + .../net/ethernet/stmicro/stmmac/dwmac1000_core.c | 3 +- drivers/net/ipvlan/ipvlan_core.c | 19 ++++---- drivers/net/ipvlan/ipvlan_main.c | 5 +- drivers/net/macsec.c | 12 +++-- drivers/net/macvlan.c | 2 + drivers/net/phy/phy_device.c | 18 +++++--- drivers/net/slip/slhc.c | 14 ++++-- drivers/net/team/team.c | 2 + drivers/net/usb/r8152.c | 8 ++++ drivers/net/wireless/intel/iwlwifi/mvm/nvm.c | 3 +- drivers/net/wireless/mediatek/mt76/dma.c | 9 ++-- drivers/pinctrl/core.c | 1 - drivers/pinctrl/meson/pinctrl-meson-gxl.c | 4 +- fs/cifs/dir.c | 1 - fs/gfs2/inode.c | 2 +- fs/open.c | 3 -- include/linux/cgroup.h | 1 + include/linux/efi.h | 36 +++++++++++++++ include/linux/inet_diag.h | 18 +++++--- include/linux/phy.h | 2 + include/net/fib_rules.h | 1 + kernel/cgroup/cgroup.c | 37 +++++++++++---- kernel/workqueue.c | 14 +++--- mm/memcontrol.c | 14 +----- net/batman-adv/bat_iv_ogm.c | 4 ++ net/batman-adv/bat_v_ogm.c | 42 +++++++++++++---- net/batman-adv/types.h | 4 ++ net/core/devlink.c | 33 +++++++++----- net/core/netclassid_cgroup.c | 47 +++++++++++++++---- net/core/sock.c | 5 +- net/ieee802154/nl_policy.c | 6 +++ net/ipv4/gre_demux.c | 12 ++++- net/ipv4/inet_connection_sock.c | 20 ++++++++ net/ipv4/inet_diag.c | 44 ++++++++---------- net/ipv4/raw_diag.c | 5 +- net/ipv4/udp_diag.c | 5 +- net/ipv6/addrconf.c | 49 +++++++++++++++----- net/ipv6/ipv6_sockglue.c | 10 +++- net/netfilter/nf_conntrack_standalone.c | 2 +- net/netfilter/nf_synproxy_core.c | 2 +- net/netfilter/nfnetlink_cthelper.c | 2 + net/netfilter/nft_payload.c | 1 + net/netfilter/nft_tunnel.c | 2 + net/netfilter/x_tables.c | 6 +-- net/netfilter/xt_recent.c | 2 +- net/netlink/af_netlink.c | 2 +- net/nfc/hci/core.c | 19 ++++++-- net/nfc/netlink.c | 4 ++ net/packet/af_packet.c | 13 +++--- net/sched/sch_fq.c | 1 + net/sctp/diag.c | 8 +--- net/smc/smc_ib.c | 3 ++ net/tipc/netlink.c | 3 +- net/wireless/nl80211.c | 5 ++ tools/perf/bench/futex-wake.c | 4 +- tools/testing/ktest/ktest.pl | 2 +- tools/testing/selftests/net/fib_tests.sh | 34 ++++++++++++-- 84 files changed, 625 insertions(+), 283 deletions(-)

4 years, 7 months

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[tip: x86/urgent] x86/ioremap: Fix CONFIG_EFI=n build

by tip-bot2 for Borislav Petkov

The following commit has been merged into the x86/urgent branch of tip: Commit-ID: 870b4333a62e45b0b2000d14b301b7b8b8cad9da Gitweb: https://git.kernel.org/tip/870b4333a62e45b0b2000d14b301b7b8b8cad9da Author: Borislav Petkov <bp(a)suse.de> AuthorDate: Wed, 18 Mar 2020 19:27:48 +01:00 Committer: Borislav Petkov <bp(a)suse.de> CommitterDate: Thu, 19 Mar 2020 10:55:56 +01:00 x86/ioremap: Fix CONFIG_EFI=n build In order to use efi_mem_type(), one needs CONFIG_EFI enabled. Otherwise that function is undefined. Use IS_ENABLED() to check and avoid the ifdeffery as the compiler optimizes away the following unreachable code then. Fixes: 985e537a4082 ("x86/ioremap: Map EFI runtime services data as encrypted for SEV") Reported-by: Randy Dunlap <rdunlap(a)infradead.org> Signed-off-by: Borislav Petkov <bp(a)suse.de> Tested-by: Randy Dunlap <rdunlap(a)infradead.org> Cc: Tom Lendacky <thomas.lendacky(a)amd.com> Cc: <stable(a)vger.kernel.org> Link: https://lkml.kernel.org/r/7561e981-0d9b-d62c-0ef2-ce6007aff1ab@infradead.org --- arch/x86/mm/ioremap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 935a91e..18c637c 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -115,6 +115,9 @@ static void __ioremap_check_other(resource_size_t addr, struct ioremap_desc *des if (!sev_active()) return; + if (!IS_ENABLED(CONFIG_EFI)) + return; + if (efi_mem_type(addr) == EFI_RUNTIME_SERVICES_DATA) desc->flags |= IORES_MAP_ENCRYPTED; }

4 years, 7 months

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Re: [PATCH v2] net: qrtr: fix len of skb_put_padto in qrtr_node_enqueue

by Doug Anderson

Hi, On Sun, Jan 5, 2020 at 2:47 PM David Miller <davem(a)davemloft.net> wrote: > > From: Wen Gong <wgong(a)codeaurora.org> > Date: Fri, 3 Jan 2020 12:50:16 +0800 > > > The len used for skb_put_padto is wrong, it need to add len of hdr. > > Thanks, applied. I noticed this patch is in mainline now as: ce57785bf91b net: qrtr: fix len of skb_put_padto in qrtr_node_enqueue Though I'm not an expert on the code, it feels like a stable candidate unless someone objects. -Doug

4 years, 7 months

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[4.19] i2400m fixes

by Ben Hutchings

Please pick the following commits for the 4.19 branch: 2507e6ab7a9a wimax: i2400: fix memory leak 6f3ef5c25cc7 wimax: i2400: Fix memory leak in i2400m_op_rfkill_sw_toggle I previously sent these to you for other stable branches, but accidentally missed 4.19. Ben. -- Ben Hutchings, Software Developer Codethink Ltd https://www.codethink.co.uk/ Dale House, 35 Dale Street Manchester, M1 2HF, United Kingdom

4 years, 7 months

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patch "nvmem: check for NULL reg_read and reg_write before dereferencing" added to char-misc-next

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled nvmem: check for NULL reg_read and reg_write before dereferencing to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-next branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will also be merged in the next major kernel release during the merge window. If you have any questions about this process, please let me know. >From 3c91ef69a3e94f78546b246225ed573fbf1735b4 Mon Sep 17 00:00:00 2001 From: Nicholas Johnson <nicholas.johnson-opensource(a)outlook.com.au> Date: Tue, 10 Mar 2020 13:22:52 +0000 Subject: nvmem: check for NULL reg_read and reg_write before dereferencing Return -EPERM if reg_read is NULL in bin_attr_nvmem_read() or if reg_write is NULL in bin_attr_nvmem_write(). This prevents NULL dereferences such as the one described in 03cd45d2e219 ("thunderbolt: Prevent crash if non-active NVMem file is read") Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource(a)outlook.com.au> Cc: stable <stable(a)vger.kernel.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla(a)linaro.org> Link: https://lore.kernel.org/r/20200310132257.23358-10-srinivas.kandagatla@linar… Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/nvmem/nvmem-sysfs.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/nvmem/nvmem-sysfs.c b/drivers/nvmem/nvmem-sysfs.c index 9e0c429cd08a..8759c4470012 100644 --- a/drivers/nvmem/nvmem-sysfs.c +++ b/drivers/nvmem/nvmem-sysfs.c @@ -56,6 +56,9 @@ static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj, count = round_down(count, nvmem->word_size); + if (!nvmem->reg_read) + return -EPERM; + rc = nvmem->reg_read(nvmem->priv, pos, buf, count); if (rc) @@ -90,6 +93,9 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, count = round_down(count, nvmem->word_size); + if (!nvmem->reg_write) + return -EPERM; + rc = nvmem->reg_write(nvmem->priv, pos, buf, count); if (rc) -- 2.25.2

4 years, 7 months

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patch "nvmem: release the write-protect pin" added to char-misc-next

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled nvmem: release the write-protect pin to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-next branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will also be merged in the next major kernel release during the merge window. If you have any questions about this process, please let me know. >From a9c3766cb19cdadf2776aba41b64470002645894 Mon Sep 17 00:00:00 2001 From: Khouloud Touil <ktouil(a)baylibre.com> Date: Tue, 10 Mar 2020 13:22:50 +0000 Subject: nvmem: release the write-protect pin Put the write-protect GPIO descriptor in nvmem_release() so that it can be automatically released when the associated device's reference count drops to 0. Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin") Reported-by: Geert Uytterhoeven <geert(a)linux-m68k.org> Signed-off-by: Khouloud Touil <ktouil(a)baylibre.com> Cc: stable <stable(a)vger.kernel.org> [Bartosz: tweak the commit message] Signed-off-by: Bartosz Golaszewski <bgolaszewski(a)baylibre.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla(a)linaro.org> Link: https://lore.kernel.org/r/20200310132257.23358-8-srinivas.kandagatla@linaro… Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/nvmem/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 2758d90d63b7..c05c4f4a7b9e 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -72,6 +72,7 @@ static void nvmem_release(struct device *dev) struct nvmem_device *nvmem = to_nvmem_device(dev); ida_simple_remove(&nvmem_ida, nvmem->id); + gpiod_put(nvmem->wp_gpio); kfree(nvmem); } -- 2.25.2

4 years, 7 months

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[PATCH v4 2/5] fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()

by Eric Biggers

From: Eric Biggers <ebiggers(a)google.com> After request_module(), nothing is stopping the module from being unloaded until someone takes a reference to it via try_get_module(). The WARN_ONCE() in get_fs_type() is thus user-reachable, via userspace running 'rmmod' concurrently. Since WARN_ONCE() is for kernel bugs only, not for user-reachable situations, downgrade this warning to pr_warn_once(). Keep it printed once only, since the intent of this warning is to detect a bug in modprobe at boot time. Printing the warning more than once wouldn't really provide any useful extra information. Fixes: 41124db869b7 ("fs: warn in case userspace lied about modprobe return") Acked-by: Luis Chamberlain <mcgrof(a)kernel.org> Reviewed-by: Jessica Yu <jeyu(a)kernel.org> Cc: <stable(a)vger.kernel.org> # v4.13+ Cc: Alexei Starovoitov <ast(a)kernel.org> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Cc: Jeff Vander Stoep <jeffv(a)google.com> Cc: Kees Cook <keescook(a)chromium.org> Cc: NeilBrown <neilb(a)suse.com> Signed-off-by: Eric Biggers <ebiggers(a)google.com> --- fs/filesystems.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/filesystems.c b/fs/filesystems.c index 77bf5f95362da..90b8d879fbaf3 100644 --- a/fs/filesystems.c +++ b/fs/filesystems.c @@ -272,7 +272,9 @@ struct file_system_type *get_fs_type(const char *name) fs = __get_fs_type(name, len); if (!fs && (request_module("fs-%.*s", len, name) == 0)) { fs = __get_fs_type(name, len); - WARN_ONCE(!fs, "request_module fs-%.*s succeeded, but still no fs?\n", len, name); + if (!fs) + pr_warn_once("request_module fs-%.*s succeeded, but still no fs?\n", + len, name); } if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) { -- 2.25.1

4 years, 7 months

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[PATCH v4 1/5] kmod: make request_module() return an error when autoloading is disabled

by Eric Biggers

From: Eric Biggers <ebiggers(a)google.com> It's long been possible to disable kernel module autoloading completely (while still allowing manual module insertion) by setting /proc/sys/kernel/modprobe to the empty string. This can be preferable to setting it to a nonexistent file since it avoids the overhead of an attempted execve(), avoids potential deadlocks, and avoids the call to security_kernel_module_request() and thus on SELinux-based systems eliminates the need to write SELinux rules to dontaudit module_request. However, when module autoloading is disabled in this way, request_module() returns 0. This is broken because callers expect 0 to mean that the module was successfully loaded. Apparently this was never noticed because this method of disabling module autoloading isn't used much, and also most callers don't use the return value of request_module() since it's always necessary to check whether the module registered its functionality or not anyway. But improperly returning 0 can indeed confuse a few callers, for example get_fs_type() in fs/filesystems.c where it causes a WARNING to be hit: if (!fs && (request_module("fs-%.*s", len, name) == 0)) { fs = __get_fs_type(name, len); WARN_ONCE(!fs, "request_module fs-%.*s succeeded, but still no fs?\n", len, name); } This is easily reproduced with: echo > /proc/sys/kernel/modprobe mount -t NONEXISTENT none / It causes: request_module fs-NONEXISTENT succeeded, but still no fs? WARNING: CPU: 1 PID: 1106 at fs/filesystems.c:275 get_fs_type+0xd6/0xf0 [...] This should actually use pr_warn_once() rather than WARN_ONCE(), since it's also user-reachable if userspace immediately unloads the module. Regardless, request_module() should correctly return an error when it fails. So let's make it return -ENOENT, which matches the error when the modprobe binary doesn't exist. I've also sent patches to document and test this case. Acked-by: Luis Chamberlain <mcgrof(a)kernel.org> Reviewed-by: Jessica Yu <jeyu(a)kernel.org> Reviewed-by: Kees Cook <keescook(a)chromium.org> Cc: stable(a)vger.kernel.org Cc: Alexei Starovoitov <ast(a)kernel.org> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Cc: Jeff Vander Stoep <jeffv(a)google.com> Cc: NeilBrown <neilb(a)suse.com> Signed-off-by: Eric Biggers <ebiggers(a)google.com> --- kernel/kmod.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/kmod.c b/kernel/kmod.c index bc6addd9152b4..a2de58de6ab62 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -120,7 +120,7 @@ static int call_modprobe(char *module_name, int wait) * invoke it. * * If module auto-loading support is disabled then this function - * becomes a no-operation. + * simply returns -ENOENT. */ int __request_module(bool wait, const char *fmt, ...) { @@ -137,7 +137,7 @@ int __request_module(bool wait, const char *fmt, ...) WARN_ON_ONCE(wait && current_is_async()); if (!modprobe_path[0]) - return 0; + return -ENOENT; va_start(args, fmt); ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args); -- 2.25.1

4 years, 7 months

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[PATCH v3 2/5] fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()

by Eric Biggers

From: Eric Biggers <ebiggers(a)google.com> After request_module(), nothing is stopping the module from being unloaded until someone takes a reference to it via try_get_module(). The WARN_ONCE() in get_fs_type() is thus user-reachable, via userspace running 'rmmod' concurrently. Since WARN_ONCE() is for kernel bugs only, not for user-reachable situations, downgrade this warning to pr_warn_once(). Acked-by: Luis Chamberlain <mcgrof(a)kernel.org> Cc: stable(a)vger.kernel.org Cc: Alexei Starovoitov <ast(a)kernel.org> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Cc: Jeff Vander Stoep <jeffv(a)google.com> Cc: Jessica Yu <jeyu(a)kernel.org> Cc: Kees Cook <keescook(a)chromium.org> Cc: NeilBrown <neilb(a)suse.com> Signed-off-by: Eric Biggers <ebiggers(a)google.com> --- fs/filesystems.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/filesystems.c b/fs/filesystems.c index 77bf5f95362da..90b8d879fbaf3 100644 --- a/fs/filesystems.c +++ b/fs/filesystems.c @@ -272,7 +272,9 @@ struct file_system_type *get_fs_type(const char *name) fs = __get_fs_type(name, len); if (!fs && (request_module("fs-%.*s", len, name) == 0)) { fs = __get_fs_type(name, len); - WARN_ONCE(!fs, "request_module fs-%.*s succeeded, but still no fs?\n", len, name); + if (!fs) + pr_warn_once("request_module fs-%.*s succeeded, but still no fs?\n", + len, name); } if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) { -- 2.25.1

4 years, 7 months

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