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 Foxconn T99W265 - mcb: fix error handling in mcb_alloc_bus() - serial: mvebu-uart: fix driver's tx_empty callback - net: hso: fix muxed tty registration - bnxt_en: Fix TX timeout when TX ring size is set to the smallest - net/mlx4_en: Don't allow aRFS for encapsulated packets - scsi: iscsi: Adjust iface sysfs attr detection - thermal/core: Potential buffer overflow in thermal_build_list_of_policies() - irqchip/gic-v3-its: Fix potential VPE leak on error - md: fix a lock order reversal in md_alloc - blktrace: Fix uaf in blk_trace access after removing by sysfs - net: macb: fix use after free on rmmod - net: stmmac: allow CSR clock of 300MHz - m68k: Double cast io functions to unsigned long - xen/balloon: use a kernel thread instead a workqueue - compiler.h: Introduce absolute_pointer macro - net: i825xx: Use absolute_pointer for memcpy from fixed memory location - sparc: avoid stringop-overread errors - qnx4: avoid stringop-overread errors - parisc: Use absolute_pointer() to define PAGE0 - arm64: Mark __stack_chk_guard as __ro_after_init - alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile - net: 6pack: Fix tx timeout and slot time - spi: Fix tegra20 build with CONFIG_PM=n - arm64: dts: marvell: armada-37xx: Extend PCIe MEM space - PCI: aardvark: Fix checking for PIO Non-posted Request - PCI: aardvark: Fix checking for PIO status - xen/balloon: fix balloon kthread freezing - qnx4: work around gcc false positive warning bug - 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 - mac80211: fix use-after-free in CCMP/GCMP RX - ipvs: check that ip_vs_conn_tab_bits is between 8 and 20 - mac80211: Fix ieee80211_amsdu_aggregate frag_tail bug - mac80211: limit injected vht mcs/nss in ieee80211_parse_tx_radiotap - sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb - hwmon: (tmp421) fix rounding for negative values - e100: fix length calculation in e100_get_regs_len - e100: fix buffer overrun in e100_get_regs - scsi: csiostor: Add module softdep on cxgb4 - af_unix: fix races in sk_peer_pid and sk_peer_cred accesses - ipack: ipoctal: fix stack information leak - ipack: ipoctal: fix tty registration race - ipack: ipoctal: fix tty-registration error handling - ipack: ipoctal: fix missing allocation-failure check - ipack: ipoctal: fix module reference leak - ext4: fix potential infinite loop in ext4_dx_readdir() - net: udp: annotate data race around udp_sk(sk)->corkflag - EDAC/synopsys: Fix wrong value type assignment for edac_mode - ARM: 9077/1: PLT: Move struct plt_entries definition to header - ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link() - ARM: 9079/1: ftrace: Add MODULE_PLTS support - ARM: 9098/1: ftrace: MODULE_PLT: Fix build problem without DYNAMIC_FTRACE - arm64: Extend workaround for erratum 1024718 to all versions of Cortex-A55 - hso: fix bailout in error case of probe - usb: hso: fix error handling code of hso_create_net_device - usb: hso: remove the bailout parameter - crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd() - HID: betop: fix slab-out-of-bounds Write in betop_probe - netfilter: ipset: Fix oversized kvmalloc() calls - HID: usbhid: free raw_report buffers in usbhid_stop - cred: allow get_cred() and put_cred() to be given NULL. - gpio: uniphier: Fix void functions to remove return value - tty: synclink_gt, drop unneeded forward declarations - tty: synclink_gt: rename a conflicting function name - drm/amd/display: Pass PCI deviceid into DC - hwmon: (tmp421) Replace S_<PERMS> with octal values - hwmon: (tmp421) report /PVLD condition as fault * ACL updates on OCFS2 are not revalidated (LP: #1947161) // Bionic update: upstream stable patchset 2021-11-02 (LP: #1949512) - ocfs2: drop acl cache for directories too -- Kleber Sacilotto de Souza <kleber.so...@canonical.com> Fri, 05 Nov 2021 12:22:08 +0100 ** Changed in: linux (Ubuntu Bionic) Status: Fix Committed => Fix Released ** Changed in: linux (Ubuntu Focal) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1947709 Title: Drop "UBUNTU: SAUCE: cachefiles: Page leaking in cachefiles_read_backing_file while vmscan is active" Status in linux package in Ubuntu: Confirmed Status in linux source package in Bionic: Fix Released Status in linux source package in Focal: Fix Released Status in linux source package in Hirsute: Fix Released Status in linux source package in Impish: Fix Released Status in linux source package in Jammy: Confirmed Bug description: [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. 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