This bug was fixed in the package linux - 4.15.0-154.161
---------------
linux (4.15.0-154.161) bionic; urgency=medium
* bionic/linux: 4.15.0-154.161 -proposed tracker (LP: #1938411)
* Potential reverts of 4.19.y stable changes in 18.04 (LP: #1938537)
- SAUCE: Revert "locking/mutex: clear MUTEX_FLAGS if wait_list is empty due
to
signal"
- SAUCE: Revert "drm/amd/amdgpu: fix refcount leak"
* Packaging resync (LP: #1786013)
- [Packaging] resync getabis
- [Packaging] update helper scripts
- update dkms package versions
* btrfs: Automatic balance returns -EUCLEAN and leads to forced readonly
filesystem (LP: #1934709) // CVE-2019-19036
- btrfs: Validate child tree block's level and first key
- btrfs: Detect unbalanced tree with empty leaf before crashing btree
operations
* btrfs: Automatic balance returns -EUCLEAN and leads to forced readonly
filesystem (LP: #1934709)
- Revert "btrfs: Detect unbalanced tree with empty leaf before crashing
btree
operations"
- Revert "btrfs: Validate child tree block's level and first key"
- btrfs: Only check first key for committed tree blocks
- btrfs: Fix wrong first_key parameter in replace_path
* Enable fib-onlink-tests.sh and msg_zerocopy.sh in kselftests/net on Bionic
(LP: #1934759)
- selftests: Add fib-onlink-tests.sh to TEST_PROGS
- selftests: net: use TEST_PROGS_EXTENDED
- selftests/net: enable msg_zerocopy test
- SAUCE: selftests: Make fib-onlink-tests.sh executable
* Kernel oops due to uninitialized list on kernfs (kernfs_kill_sb)
(LP: #1934175)
- kernfs: deal with kernfs_fill_super() failures
- unfuck sysfs_mount()
* large_dir in ext4 broken (LP: #1933074)
- SAUCE: ext4: fix directory index node split corruption
* btrfs: Attempting to balance a nearly full filesystem with relocated root
nodes fails (LP: #1933172) // CVE-2019-19036
- btrfs: reloc: fix reloc root leak and NULL pointer dereference
* btrfs: Attempting to balance a nearly full filesystem with relocated root
nodes fails (LP: #1933172)
- Revert "btrfs: reloc: fix reloc root leak and NULL pointer dereference"
* Pixel format change broken for Elgato Cam Link 4K (LP: #1932367)
- (upstream) media: uvcvideo: Fix pixel format change for Elgato Cam Link 4K
* Bionic update: upstream stable patchset 2021-06-23 (LP: #1933375)
- net: usb: cdc_ncm: don't spew notifications
- efi: Allow EFI_MEMORY_XP and EFI_MEMORY_RO both to be cleared
- efi: cper: fix snprintf() use in cper_dimm_err_location()
- vfio/pci: Fix error return code in vfio_ecap_init()
- vfio/pci: zap_vma_ptes() needs MMU
- vfio/platform: fix module_put call in error flow
- ipvs: ignore IP_VS_SVC_F_HASHED flag when adding service
- HID: pidff: fix error return code in hid_pidff_init()
- HID: i2c-hid: fix format string mismatch
- netfilter: nfnetlink_cthelper: hit EBUSY on updates if size mismatches
- ieee802154: fix error return code in ieee802154_add_iface()
- ieee802154: fix error return code in ieee802154_llsec_getparams()
- Bluetooth: fix the erroneous flush_work() order
- Bluetooth: use correct lock to prevent UAF of hdev object
- net: caif: added cfserl_release function
- net: caif: add proper error handling
- net: caif: fix memory leak in caif_device_notify
- net: caif: fix memory leak in cfusbl_device_notify
- ALSA: timer: Fix master timer notification
- ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed
- pid: take a reference when initializing `cad_pid`
- ocfs2: fix data corruption by fallocate
- nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect
- btrfs: fix error handling in btrfs_del_csums
- btrfs: fixup error handling in fixup_inode_link_counts
- mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY
- selftests/bpf: make 'dubious pointer arithmetic' test useful
- bnxt_en: Remove the setting of dev_port.
- KVM: SVM: Truncate GPR value for DR and CR accesses in !64-bit mode
- sched/fair: Optimize select_idle_cpu
- xen-pciback: redo VF placement in the virtual topology
- ALSA: usb: update old-style static const declaration
- nl80211: validate key indexes for cfg80211_registered_device
- x86/apic: Mark _all_ legacy interrupts when IO/APIC is missing
- btrfs: return errors from btrfs_del_csums in cleanup_ref_head
- KVM: arm64: Fix debug register indexing
-- Kleber Sacilotto de Souza <kleber.so...@canonical.com> Fri, 30 Jul
2021 14:39:24 +0200
** Changed in: linux (Ubuntu Bionic)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2019-19036
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https://bugs.launchpad.net/bugs/1938537
Title:
Potential reverts of 4.19.y stable changes in 18.04
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Released
Bug description:
== SRU Justification ==
Impact: While reviewing patches done as part of stable work there were
two changes which came from linux-4.19.y and seemed not quite right
for the 4.15 kernel version we have in 18.04/Bionic:
2e1eb7b6e1e0 locking/mutex: clear MUTEX_FLAGS if wait_list is empty
due to signal
This change is only in 4.19y and not in 4.14.y despite it is implied
that the breaking commit was already in 3.13. It also seems to pair up
with a mode of mutex which only got added to 4.19. Although there were
no reports yet, which could prove this wrong, it feels like we rather
should not take this change without a case where the current code is
reported to be wrong.
6c0065eb69de drm/amd/amdgpu: fix refcount leak
The driver in 4.15 does take refcounts the same way as 4.19 does. We
are missing 37ac3dc00da0 ("drm/amdgpu: Use device specific BO size &
stride check.") which changed that. So we really should revert this
one.
Testing: These are proactive reverts, so there is no real test that
could be done. However this just moves back to a state which we had
before. And for that state we had no bug reports.
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