Security-Fix Xen XSA 371 for Kernel 5.4.0-71

[Jan Kellermann]

[SRU Justification]

See [XSA 371](http://xenbits.xen.org/xsa/advisory-371.html). commit 871997bc9e423f05c7da7c9178e62dde5df2a7f8 ("xen-blkback: fix error handling in xen_blkbk_map()") introduced a security vulnerability.

Original Commit:
871997bc9e423f05c7da7c9178e62dde5df2a7f8 ("xen-blkback: fix error handling in xen_blkbk_map()")

New commit with security fix:
a846738f8c3788d846ed1f587270d2f2e3d32432 ("xen-blkback: don't leak persistent grants from xen_blkbk_map()")

[Test Plan]
none

[Where problems could occur]
Unknown

[Other Info]
- http://xenbits.xen.org/xsa/advisory-371.html
- http://xenbits.xen.org/xsa/xsa371-linux.patch
- http://xenbits.xen.org/xsa/advisory-365.html
- http://xenbits.xen.org/xsa/xsa365-linux.patch

[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 1921902

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.

[Jan Kellermann (jan-kellermann)]

Due to kind of report are no logs available.

[Tim Gardner (timg-tpi)]

upstream commit a846738f8c3788d846ed1f587270d2f2e3d32432 ("xen-blkback: don't leak persistent grants from xen_blkbk_map()")

[Tim Gardner (timg-tpi)]

Patches submitted:

https://lists.ubuntu.com/archives/kernel-team/2021-April/118727.html
https://lists.ubuntu.com/archives/kernel-team/2021-April/118765.html

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.15.0-143.147

---------------
linux (4.15.0-143.147) bionic; urgency=medium

  * bionic/linux: 4.15.0-143.147 -proposed tracker (LP: #1923811)

  * CVE-2021-29650
    - netfilter: x_tables: Use correct memory barriers.

  * LRMv4: switch to signing nvidia modules via the Ubuntu Modules signing key
    (LP: #1918134)
    - [Packaging] dkms-build{,--nvidia-N} sync back from LRMv4

  * Security-Fix Xen XSA 371 for Kernel 5.4.0-71 (LP: #1921902) //
    CVE-2021-28688
    - xen-blkback: don't leak persistent grants from xen_blkbk_map()

  * CVE-2021-20292
    - drm/ttm/nouveau: don't call tt destroy callback on alloc failure.

  * CVE-2021-29264
    - gianfar: fix jumbo packets+napi+rx overrun crash

  * CVE-2021-29265
    - usbip: fix stub_dev usbip_sockfd_store() races leading to gpf

  * Bcache bypasse writeback on caching device with fragmentation (LP: #1900438)
    - bcache: consider the fragmentation when update the writeback rate

  * Bionic update: upstream stable patchset 2021-03-31 (LP: #1922124)
    - net: usb: qmi_wwan: support ZTE P685M modem
    - scripts: use pkg-config to locate libcrypto
    - scripts: set proper OpenSSL include dir also for sign-file
    - hugetlb: fix update_and_free_page contig page struct assumption
    - drm/virtio: use kvmalloc for large allocations
    - virtio/s390: implement virtio-ccw revision 2 correctly
    - arm64 module: set plt* section addresses to 0x0
    - arm64: Avoid redundant type conversions in xchg() and cmpxchg()
    - arm64: cmpxchg: Use "K" instead of "L" for ll/sc immediate constraint
    - arm64: Use correct ll/sc atomic constraints
    - JFS: more checks for invalid superblock
    - media: mceusb: sanity check for prescaler value
    - xfs: Fix assert failure in xfs_setattr_size()
    - smackfs: restrict bytes count in smackfs write functions
    - net: fix up truesize of cloned skb in skb_prepare_for_shift()
    - mm/hugetlb.c: fix unnecessary address expansion of pmd sharing
    - net: bridge: use switchdev for port flags set through sysfs too
    - dt-bindings: net: btusb: DT fix s/interrupt-name/interrupt-names/
    - staging: fwserial: Fix error handling in fwserial_create
    - x86/reboot: Add Zotac ZBOX CI327 nano PCI reboot quirk
    - vt/consolemap: do font sum unsigned
    - wlcore: Fix command execute failure 19 for wl12xx
    - pktgen: fix misuse of BUG_ON() in pktgen_thread_worker()
    - ath10k: fix wmi mgmt tx queue full due to race condition
    - x86/build: Treat R_386_PLT32 relocation as R_386_PC32
    - Bluetooth: Fix null pointer dereference in amp_read_loc_assoc_final_data
    - staging: most: sound: add sanity check for function argument
    - media: uvcvideo: Allow entities with no pads
    - f2fs: handle unallocated section and zone on pinned/atgc
    - parisc: Bump 64-bit IRQ stack size to 64 KB
    - Xen/gnttab: handle p2m update errors on a per-slot basis
    - xen-netback: respect gnttab_map_refs()'s return value
    - zsmalloc: account the number of compacted pages correctly
    - swap: fix swapfile read/write offset
    - media: v4l: ioctl: Fix memory leak in video_usercopy
    - PCI: Add a REBAR size quirk for S...

[Brian Murray (brian-murray)]

The Groovy Gorilla has reached end of life, so this bug will not be fixed for that release

[Brian Murray (brian-murray)]

The Hirsute Hippo has reached End of Life, so this bug will not be fixed for that release.