Drop "UBUNTU: SAUCE: cachefiles: Page leaking in cachefiles_read_backing_file while vmscan is active"

[Andrea Righi]

[Impact]

"UBUNTU: SAUCE: cachefiles: Page leaking in cachefiles_read_backing_file while vmscan is active" has been applied to fix a page leaking issue.

However a slightly different fix has been applied upstream:

9a24ce5b66f9c8190d63b15f4473600db4935f1f cachefiles: Fix page leak in cachefiles_read_backing_file while vmscan is active

Basically we are fixing the same issue in two different ways at the same time, but even worse our patch an introduce a potential NULL pointer dereference: we do a put_page(newpage) and set newpage = NULL in the main for() loop and then we may do additional put_page(newpage) after the main for loop if ret == -EEXIST, that would trigger the NULL pointer dereference.

[Test case]

No test case or reproducer is available at the moment, this issue has been found simply by reviewing the code.

[Fix]

Drop the SAUCE patch and rely on the upstream fix.

[Regression potential]

If the analysis is not correct we may re-introduce a page leak in
cachefiles (NFS for example), but it seems unlikely to happen, since the upstream fix is addressing the page leaking already.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1947709

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/5.13.0-22.22 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-impish' to 'verification-done-impish'. If the problem still exists, change the tag 'verification-needed-impish' to 'verification-failed-impish'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/5.11.0-41.45 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-hirsute' to 'verification-done-hirsute'. If the problem still exists, change the tag 'verification-needed-hirsute' to 'verification-failed-hirsute'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/5.4.0-91.102 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/4.15.0-163.171 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Stefan Bader (smb)]

Since there is nothing to verify this based on an installed kernel I just double checked that the requested revert is part of the Ubuntu-5.11.0-41.45 proposed kernel.

[Kelsey Steele (kelsey-steele)]

verified the same revert is on Impish/Focal/Bionic. switching verification completed for those

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.15.0-163.171

---------------
linux (4.15.0-163.171) bionic; urgency=medium

  * bionic/linux: 4.15.0-163.171 -proposed tracker (LP: #1949874)

  * Packaging resync (LP: #1786013)
    - [Packaging] update Ubuntu.md
    - debian/dkms-versions -- update from kernel-versions (main/2021.11.08)

  * Unable to build net/reuseport_bpf and other tests in ubuntu_kernel_selftests
    on Bionic with make command (LP: #1949889)
    - selftests: Fix loss of test output in run_kselftests.sh
    - selftests: Makefile set KSFT_TAP_LEVEL to prevent nested TAP headers
    - selftests: fix headers_install circular dependency
    - selftests: fix bpf build/test workflow regression when KBUILD_OUTPUT is set
    - selftests: vm: Fix test build failure when built by itself

  * KVM emulation failure when booting into VM crash kernel with multiple CPUs
    (LP: #1948862)
    - KVM: x86: Properly reset MMU context at vCPU RESET/INIT

  * aufs: kernel bug with apparmor and fuseblk (LP: #1948470)
    - SAUCE: aufs: bugfix, stop omitting path->mnt

  * ebpf: bpf_redirect fails with ip6 gre interfaces (LP: #1947164)
    - net: handle ARPHRD_IP6GRE in dev_is_mac_header_xmit()

  * require CAP_NET_ADMIN to attach N_HCI ldisc (LP: #1949516)
    - Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc

  * ACL updates on OCFS2 are not revalidated (LP: #1947161)
    - ocfs2: fix remounting needed after setfacl command

  * ppc64 BPF JIT mod by 1 will not return 0 (LP: #1948351)
    - powerpc/bpf: Fix BPF_MOD when imm == 1

  * Drop "UBUNTU: SAUCE: cachefiles: Page leaking in
    cachefiles_read_backing_file while vmscan is active" (LP: #1947709)
    - Revert "UBUNTU: SAUCE: cachefiles: Page leaking in
      cachefiles_read_backing_file while vmscan is active"
    - cachefiles: Fix page leak in cachefiles_read_backing_file while vmscan is
      active

  * Some test in ubuntu_bpf test_verifier failed on i386 Bionic kernel
    (LP: #1788578)
    - bpf: fix context access in tracing progs on 32 bit archs

  * test_bpf.sh from ubuntu_kernel_selftests.net from linux ADT test failure
    with linux/4.15.0-149.153 i386 (Segmentation fault) (LP: #1934414)
    - selftests/bpf: make test_verifier run most programs
    - bpf: add couple of test cases for div/mod by zero
    - bpf: add further test cases around div/mod and others

  * Bionic update: upstream stable patchset 2021-11-02 (LP: #1949512)
    - usb: gadget: r8a66597: fix a loop in set_feature()
    - usb: musb: tusb6010: uninitialized data in tusb_fifo_write_unaligned()
    - cifs: fix incorrect check for null pointer in header_assemble
    - xen/x86: fix PV trap handling on secondary processors
    - usb-storage: Add quirk for ScanLogic SL11R-IDE older than 2.6c
    - USB: serial: cp210x: add ID for GW Instek GDM-834x Digital Multimeter
    - staging: greybus: uart: fix tty use after free
    - Re-enable UAS for LaCie Rugged USB3-FW with fk quirk
    - USB: serial: mos7840: remove duplicated 0xac24 device ID
    - USB: serial: option: add Telit LN920 compositions
    - USB: serial: option: remove duplicate USB device ID
    - USB: serial: option: add device id for Foxco...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.4.0-91.102

---------------
linux (5.4.0-91.102) focal; urgency=medium

  * focal/linux: 5.4.0-91.102 -proposed tracker (LP: #1949840)

  * Packaging resync (LP: #1786013)
    - [Packaging] update Ubuntu.md
    - debian/dkms-versions -- update from kernel-versions (main/2021.11.08)

  * KVM emulation failure when booting into VM crash kernel with multiple CPUs
    (LP: #1948862)
    - KVM: x86: Properly reset MMU context at vCPU RESET/INIT

  * aufs: kernel bug with apparmor and fuseblk (LP: #1948470)
    - SAUCE: aufs: bugfix, stop omitting path->mnt

  * ebpf: bpf_redirect fails with ip6 gre interfaces (LP: #1947164)
    - net: handle ARPHRD_IP6GRE in dev_is_mac_header_xmit()

  * require CAP_NET_ADMIN to attach N_HCI ldisc (LP: #1949516)
    - Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc

  * ACL updates on OCFS2 are not revalidated (LP: #1947161)
    - ocfs2: fix remounting needed after setfacl command

  * ppc64 BPF JIT mod by 1 will not return 0 (LP: #1948351)
    - powerpc/bpf: Fix BPF_MOD when imm == 1

  * Drop "UBUNTU: SAUCE: cachefiles: Page leaking in
    cachefiles_read_backing_file while vmscan is active" (LP: #1947709)
    - Revert "UBUNTU: SAUCE: cachefiles: Page leaking in
      cachefiles_read_backing_file while vmscan is active"

  * Reassign I/O Path of ConnectX-5 Port 1 before Port 2 causes NULL dereference
    (LP: #1943464)
    - s390/pci: fix leak of PCI device structure
    - s390/pci: fix use after free of zpci_dev
    - s390/pci: fix zpci_zdev_put() on reserve

  * [SRU][F] USB: serial: pl2303: add support for PL2303HXN (LP: #1948377)
    - USB: serial: pl2303: add support for PL2303HXN
    - USB: serial: pl2303: fix line-speed handling on newer chips

  * Focal update: v5.4.151 upstream stable release (LP: #1947888)
    - tty: Fix out-of-bound vmalloc access in imageblit
    - cpufreq: schedutil: Use kobject release() method to free sugov_tunables
    - cpufreq: schedutil: Destroy mutex before kobject_put() frees the memory
    - usb: cdns3: fix race condition before setting doorbell
    - fs-verity: fix signed integer overflow with i_size near S64_MAX
    - hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary
      structure field
    - hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary
      structure field
    - hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary
      structure field
    - scsi: ufs: Fix illegal offset in UPIU event trace
    - mac80211: fix use-after-free in CCMP/GCMP RX
    - x86/kvmclock: Move this_cpu_pvti into kvmclock.h
    - drm/amd/display: Pass PCI deviceid into DC
    - ipvs: check that ip_vs_conn_tab_bits is between 8 and 20
    - hwmon: (mlxreg-fan) Return non-zero value when fan current state is enforced
      from sysfs
    - mac80211: Fix ieee80211_amsdu_aggregate frag_tail bug
    - mac80211: limit injected vht mcs/nss in ieee80211_parse_tx_radiotap
    - mac80211: mesh: fix potentially unaligned access
    - mac80211-hwsim: fix late beacon hrtimer handling
    - sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb
    - hwmon: (tmp421) report /P...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.11.0-41.45

---------------
linux (5.11.0-41.45) hirsute; urgency=medium

  * hirsute/linux: 5.11.0-41.45 -proposed tracker (LP: #1949801)

  * Packaging resync (LP: #1786013)
    - [Packaging] update Ubuntu.md
    - debian/dkms-versions -- update from kernel-versions (main/2021.11.08)

  * aufs: kernel bug with apparmor and fuseblk (LP: #1948470)
    - SAUCE: aufs: bugfix, stop omitting path->mnt

  * ebpf: bpf_redirect fails with ip6 gre interfaces (LP: #1947164)
    - net: handle ARPHRD_IP6GRE in dev_is_mac_header_xmit()

  * require CAP_NET_ADMIN to attach N_HCI ldisc (LP: #1949516)
    - Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc

  * CVE-2021-3744 // CVE-2021-3764
    - crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd()

  * ppc64 BPF JIT mod by 1 will not return 0 (LP: #1948351)
    - powerpc/bpf: Fix BPF_MOD when imm == 1

  * Fix Screen freeze after resume from suspend with iGPU [1002:6987]
    (LP: #1949050)
    - drm/amdgpu: reenable BACO support for 699F:C7 polaris12 SKU
    - drm/amdgpu: add missing cleanups for Polaris12 UVD/VCE on suspend
    - drm/amdgpu: Fix crash on device remove/driver unload

  * Intel I225-IT ethernet controller: igc: probe of 0000:02:00.0 failed with
    error -1 (LP: #1945576)
    - igc: Remove _I_PHY_ID checking
    - igc: Remove phy->type checking

  * Fail to detect audio output from external monitor (LP: #1948767)
    - ALSA: hda: intel: Allow repeatedly probing on codec configuration errors

  * Drop "UBUNTU: SAUCE: cachefiles: Page leaking in
    cachefiles_read_backing_file while vmscan is active" (LP: #1947709)
    - Revert "UBUNTU: SAUCE: cachefiles: Page leaking in
      cachefiles_read_backing_file while vmscan is active"

  * Hirsute update: upstream stable patchset 2021-11-03 (LP: #1949640)
    - mm: fix uninitialized use in overcommit_policy_handler
    - usb: gadget: r8a66597: fix a loop in set_feature()
    - usb: dwc2: gadget: Fix ISOC flow for BDMA and Slave
    - usb: dwc2: gadget: Fix ISOC transfer complete handling for DDMA
    - usb: musb: tusb6010: uninitialized data in tusb_fifo_write_unaligned()
    - cifs: fix incorrect check for null pointer in header_assemble
    - xen/x86: fix PV trap handling on secondary processors
    - usb-storage: Add quirk for ScanLogic SL11R-IDE older than 2.6c
    - USB: serial: cp210x: add ID for GW Instek GDM-834x Digital Multimeter
    - USB: cdc-acm: fix minor-number release
    - Revert "USB: bcma: Add a check for devm_gpiod_get"
    - binder: make sure fd closes complete
    - staging: greybus: uart: fix tty use after free
    - Re-enable UAS for LaCie Rugged USB3-FW with fk quirk
    - usb: dwc3: core: balance phy init and exit
    - USB: serial: mos7840: remove duplicated 0xac24 device ID
    - USB: serial: option: add Telit LN920 compositions
    - USB: serial: option: remove duplicate USB device ID
    - USB: serial: option: add device id for Foxconn T99W265
    - mcb: fix error handling in mcb_alloc_bus()
    - erofs: fix up erofs_lookup tracepoint
    - btrfs: prevent __btrfs_dump_space_info() to underflow its free space
    - serial: 8250: 8250_omap: Fix RX_LVL re...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.13.0-22.22

---------------
linux (5.13.0-22.22) impish; urgency=medium

  * impish/linux: 5.13.0-22.22 -proposed tracker (LP: #1949740)

  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/2021.11.08)

  * ebpf: bpf_redirect fails with ip6 gre interfaces (LP: #1947164)
    - net: handle ARPHRD_IP6GRE in dev_is_mac_header_xmit()

  * require CAP_NET_ADMIN to attach N_HCI ldisc (LP: #1949516)
    - Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc

  * CVE-2021-3744 // CVE-2021-3764
    - crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd()

  * ppc64 BPF JIT mod by 1 will not return 0 (LP: #1948351)
    - powerpc/bpf: Fix BPF_MOD when imm == 1

  * Fix Screen freeze after resume from suspend with iGPU [1002:6987]
    (LP: #1949050)
    - drm/amdgpu: reenable BACO support for 699F:C7 polaris12 SKU
    - drm/amdgpu: add missing cleanups for Polaris12 UVD/VCE on suspend
    - drm/amdgpu: Fix crash on device remove/driver unload

  * Intel I225-IT ethernet controller: igc: probe of 0000:02:00.0 failed with
    error -1 (LP: #1945576)
    - igc: Remove _I_PHY_ID checking
    - igc: Remove phy->type checking

  * Fail to detect audio output from external monitor (LP: #1948767)
    - ALSA: hda: intel: Allow repeatedly probing on codec configuration errors

  * Drop "UBUNTU: SAUCE: cachefiles: Page leaking in
    cachefiles_read_backing_file while vmscan is active" (LP: #1947709)
    - Revert "UBUNTU: SAUCE: cachefiles: Page leaking in
      cachefiles_read_backing_file while vmscan is active"

  * rtw89 kernel module for Realtek 8852 wifi is missing (LP: #1945967)
    - rtw89: add Realtek 802.11ax driver
    - rtw89: Remove redundant check of ret after call to rtw89_mac_enable_bb_rf
    - rtw89: fix return value check in rtw89_cam_send_sec_key_cmd()
    - rtw89: remove unneeded semicolon
    - [Config] RTW89=m

  * Impish update: upstream stable patchset 2021-11-03 (LP: #1949636)
    - mm: fix uninitialized use in overcommit_policy_handler
    - usb: gadget: r8a66597: fix a loop in set_feature()
    - usb: dwc2: gadget: Fix ISOC flow for BDMA and Slave
    - usb: dwc2: gadget: Fix ISOC transfer complete handling for DDMA
    - usb: musb: tusb6010: uninitialized data in tusb_fifo_write_unaligned()
    - cifs: fix incorrect check for null pointer in header_assemble
    - xen/x86: fix PV trap handling on secondary processors
    - usb-storage: Add quirk for ScanLogic SL11R-IDE older than 2.6c
    - USB: serial: cp210x: add ID for GW Instek GDM-834x Digital Multimeter
    - USB: cdc-acm: fix minor-number release
    - Revert "USB: bcma: Add a check for devm_gpiod_get"
    - binder: make sure fd closes complete
    - staging: greybus: uart: fix tty use after free
    - Re-enable UAS for LaCie Rugged USB3-FW with fk quirk
    - usb: dwc3: core: balance phy init and exit
    - usb: core: hcd: Add support for deferring roothub registration
    - USB: serial: mos7840: remove duplicated 0xac24 device ID
    - USB: serial: option: add Telit LN920 compositions
    - USB: serial: option: remove duplicate USB device ID
    - USB: serial: option: add d...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.15.0-17.17

---------------
linux (5.15.0-17.17) jammy; urgency=medium

  * jammy/linux: 5.15.0-17.17 -proposed tracker (LP: #1957809)

 -- Andrea Righi <email address hidden> Thu, 13 Jan 2022 17:11:21 +0100