glibc fails for bionic-kvm 4.15.0-1136.141

[Roxana Nicolescu]

SRU Justification:

[Impact]
bionic linux-kvm failure https://autopkgtest.ubuntu.com/results/autopkgtest-bionic/bionic/amd64/g/glibc/20230213_154436_b51c9@/log.gz

From logs
FAIL: misc/tst-bz21269
original exit status 1
error: ../sysdeps/unix/sysv/linux/i386/tst-bz21269.c:55: not true: syscall (SYS_modify_ldt, 1, ptr, bytecount) == 0
error: 1 test failures

Syscall modify_ldt is not enabled because CONFIG_MODIFY_LDT_SYSCALL=n for bionic-kvm, even though generic and newer versions (even kvm derivativatives) have it enabled.

[Fix]
Custom patch to bionic-kvm to enable CONFIG_MODIFY_LDT_SYSCALL

[Test Plan]
Before the fix, autopkgtest for glibc will fail with
+---------------------------------------------------------------------+
| Encountered regressions that don't match expected failures. |
+---------------------------------------------------------------------+
FAIL: misc/tst-bz21269

After the fix, it should pass

[Where problems could occur]
Regression probability is pretty low, we are adding functionality not previously present but looking at focal,jammy this test was fine.

Note: Not sure why this was not enabled for bionic-kvm, even though newer versions of linux kvm has it enabled.

[Paride Legovini (paride)]

Hi, you reported this bug against the autopkgtest Ubuntu package; do you think it's actually a bug in the package? If this is not the case and the bug is likely in the failing package or its tests, please reassign the bug to linux-meta-kvm. Thanks!

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

This bug is awaiting verification that the linux-kvm/5.4.0-1091.97 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-kvm/4.15.0-1140.145 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!

[Andrei Gherzan (agherzan)]

Both focal and bionic passed glibc tests for linux-kvm:

https://autopkgtest.ubuntu.com/results/autopkgtest-focal/focal/amd64/g/glibc/20230428_090153_8d77a@/log.gz
https://autopkgtest.ubuntu.com/results/autopkgtest-bionic/bionic/amd64/g/glibc/20230428_162353_fc51a@/log.gz

Marking as verified.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-kvm - 4.15.0-1140.145

---------------
linux-kvm (4.15.0-1140.145) bionic; urgency=medium

  * bionic/linux-kvm: 4.15.0-1140.145 -proposed tracker (LP: #2016615)

  * glibc fails for bionic-kvm 4.15.0-1136.141 (LP: #2009442)
    - [Config] kvm: Add support for modifying LDT

  [ Ubuntu: 4.15.0-211.222 ]

  * bionic/linux: 4.15.0-211.222 -proposed tracker (LP: #2016623)
  * Debian autoreconstruct Fix restoration of execute permissions (LP: #2015498)
    - [Debian] autoreconstruct - fix restoration of execute permissions
  * kernel: fix __clear_user() inline assembly constraints (LP: #2013088)
    - s390/uaccess: add missing earlyclobber annotations to __clear_user()
  * Fix selftests/ftracetests/Meta-selftests (LP: #2006453)
    - selftests/ftrace: Fix bash specific "==" operator
  * Bionic update: upstream stable patchset 2023-04-05 (LP: #2015399)
    - firewire: fix memory leak for payload of request subaction to IEC 61883-1
      FCP region
    - bus: sunxi-rsb: Fix error handling in sunxi_rsb_init()
    - ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()
    - netrom: Fix use-after-free caused by accept on already connected socket
    - squashfs: harden sanity check in squashfs_read_xattr_id_table
    - sctp: do not check hb_timer.expires when resetting hb_timer
    - net: openvswitch: fix flow memory leak in ovs_flow_cmd_new
    - scsi: target: core: Fix warning on RT kernels
    - scsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress
    - net/x25: Fix to not accept on connected socket
    - usb: gadget: f_fs: Fix unbalanced spinlock in __ffs_ep0_queue_wait
    - fbcon: Check font dimension limits
    - watchdog: diag288_wdt: do not use stack buffers for hardware data
    - watchdog: diag288_wdt: fix __diag288() inline assembly
    - efi: Accept version 2 of memory attributes table
    - iio: hid: fix the retval in accel_3d_capture_sample
    - iio: adc: berlin2-adc: Add missing of_node_put() in error path
    - iio:adc:twl6030: Enable measurements of VUSB, VBAT and others
    - parisc: Fix return code of pdc_iodc_print()
    - parisc: Wire up PTRACE_GETREGS/PTRACE_SETREGS for compat case
    - mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
    - mm/swapfile: add cond_resched() in get_swap_pages()
    - Squashfs: fix handling and sanity checking of xattr_ids count
    - serial: 8250_dma: Fix DMA Rx completion race
    - serial: 8250_dma: Fix DMA Rx rearm race
    - btrfs: limit device extents to the device size
    - ALSA: emux: Avoid potential array out-of-bound in snd_emux_xg_control()
    - ALSA: pci: lx6464es: fix a debug loop
    - pinctrl: aspeed: Fix confusing types in return value
    - pinctrl: single: fix potential NULL dereference
    - net: USB: Fix wrong-direction WARNING in plusb.c
    - usb: core: add quirk for Alcor Link AK9563 smartcard reader
    - migrate: hugetlb: check for hugetlb shared PMD in node migration
    - tools/virtio: fix the vringh test for virtio ring changes
    - net/rose: Fix to not accept on connected socket
    - nvme-fc: fix a missing queue put in nvmet_fc_ls_create_association
    - aio: fix mre...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-kvm - 5.4.0-1091.97

---------------
linux-kvm (5.4.0-1091.97) focal; urgency=medium

  * focal/linux-kvm: 5.4.0-1091.97 -proposed tracker (LP: #2016577)

  * glibc fails for bionic-kvm 4.15.0-1136.141 (LP: #2009442)
    - [Config] kvm: Add support for modifying LDT

  [ Ubuntu: 5.4.0-149.166 ]

  * focal/linux: 5.4.0-149.166 -proposed tracker (LP: #2016591)
  * Focal update: v5.4.233 upstream stable release (LP: #2015909)
    - dma-mapping: add generic helpers for mapping sgtable objects
    - scatterlist: add generic wrappers for iterating over sgtable objects
    - drm: etnaviv: fix common struct sg_table related issues
    - drm/etnaviv: don't truncate physical page address
    - wifi: rtl8xxxu: gen2: Turn on the rate control
    - powerpc: dts: t208x: Mark MAC1 and MAC2 as 10G
    - random: always mix cycle counter in add_latent_entropy()
    - KVM: x86: Fail emulation during EMULTYPE_SKIP on any exception
    - can: kvaser_usb: hydra: help gcc-13 to figure out cmd_len
    - powerpc: dts: t208x: Disable 10G on MAC1 and MAC2
    - alarmtimer: Prevent starvation by small intervals and SIG_IGN
    - drm/i915/gvt: fix double free bug in split_2MB_gtt_entry
    - mac80211: mesh: embedd mesh_paths and mpp_paths into ieee80211_if_mesh
    - uaccess: Add speculation barrier to copy_from_user()
    - wifi: mwifiex: Add missing compatible string for SD8787
    - ext4: Fix function prototype mismatch for ext4_feat_ktype
    - Revert "net/sched: taprio: make qdisc_leaf() see the per-netdev-queue pfifo
      child qdiscs"
    - bpf: add missing header file include
    - Linux 5.4.233
  * selftest: fib_tests: Always cleanup before exit (LP: #2015956)
    - selftest: fib_tests: Always cleanup before exit
  * fib_tests.sh in ubuntu_kernel_selftests was skipped silently on Focal
    (LP: #2015440)
    - selftests: Fix the executable permissions for fib_tests.sh
  * Debian autoreconstruct Fix restoration of execute permissions (LP: #2015498)
    - [Debian] autoreconstruct - fix restoration of execute permissions
  * kernel: fix __clear_user() inline assembly constraints (LP: #2013088)
    - s390/uaccess: add missing earlyclobber annotations to __clear_user()
  * i/o error if next unused loop device is queried (LP: #1856871)
    - loop: fix I/O error on fsync() in detached loop devices
  * CVE-2023-1075
    - net/tls: tls_is_tx_ready() checked list_entry
  * Focal update: v5.4.232 upstream stable release (LP: #2011625)
    - firewire: fix memory leak for payload of request subaction to IEC 61883-1
      FCP region
    - bus: sunxi-rsb: Fix error handling in sunxi_rsb_init()
    - ASoC: Intel: bytcr_rt5651: Drop reference count of ACPI device after use
    - ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()
    - arm64: dts: imx8mm: Fix pad control for UART1_DTE_RX
    - scsi: Revert "scsi: core: map PQ=1, PDT=other values to
      SCSI_SCAN_TARGET_PRESENT"
    - WRITE is "data source", not destination...
    - fix iov_iter_bvec() "direction" argument
    - fix "direction" argument of iov_iter_kvec()
    - netrom: Fix use-after-free caused by accept on already connected socket
    - netfilte...