This bug was fixed in the package linux - 4.4.0-6.21
---------------
linux (4.4.0-6.21) xenial; urgency=low
[ Tim Gardner ]
* Release Tracking Bug
- LP: #1546283
* Naples/Zen, NTB Driver (LP: #1542071)
- [Config] CONFIG_NTB_AMD=m
- NTB: Add support for AMD PCI-Express Non-Transparent Bridge
* [Hyper-V] kernel panic occurs when installing Ubuntu Server x32 (LP:
#1495983)
- SAUCE: storvsc: use small sg_tablesize on x86
* Enable arm64 emulation of removed ARMv7 instructions (LP: #1545542)
- [Config] CONFIG_ARMV8_DEPRECATED=y
* Surelock-GA2:kernel panic/ exception @
pcibios_set_pcie_reset_state+0x118/0x280 + cxl_reset+0x5c/0xc0 (LP: #1545037)
- powerpc/eeh: Fix stale cached primary bus
* Miscellaneous Ubuntu changes
- SAUCE: fs: Add user namesapace member to struct super_block
- SAUCE: fs: Limit file caps to the user namespace of the super block
- SAUCE: Smack: Add support for unprivileged mounts from user namespaces
- SAUCE: block_dev: Support checking inode permissions in lookup_bdev()
- SAUCE: block_dev: Check permissions towards block device inode when
mounting
- SAUCE: fs: Treat foreign mounts as nosuid
- SAUCE: selinux: Add support for unprivileged mounts from user namespaces
- SAUCE: userns: Replace in_userns with current_in_userns
- SAUCE: Smack: Handle labels consistently in untrusted mounts
- SAUCE: fs: Check for invalid i_uid in may_follow_link()
- SAUCE: cred: Reject inodes with invalid ids in set_create_file_as()
- SAUCE: fs: Refuse uid/gid changes which don't map into s_user_ns
- SAUCE: fs: Update posix_acl support to handle user namespace mounts
- SAUCE: fs: Ensure the mounter of a filesystem is privileged towards its
inodes
- SAUCE: fs: Don't remove suid for CAP_FSETID in s_user_ns
- SAUCE: fs: Allow superblock owner to access do_remount_sb()
- SAUCE: capabilities: Allow privileged user in s_user_ns to set security.*
xattrs
- SAUCE: fuse: Add support for pid namespaces
- SAUCE: fuse: Support fuse filesystems outside of init_user_ns
- SAUCE: fuse: Restrict allow_other to the superblock's namespace or a
descendant
- SAUCE: fuse: Allow user namespace mounts
- SAUCE: mtd: Check permissions towards mtd block device inode when mounting
- SAUCE: fs: Update i_[ug]id_(read|write) to translate relative to s_user_ns
- SAUCE: quota: Convert ids relative to s_user_ns
- SAUCE: evm: Translate user/group ids relative to s_user_ns when computing
HMAC
- SAUCE: fs: Allow CAP_SYS_ADMIN in s_user_ns to freeze and thaw filesystems
- SAUCE: quota: Treat superblock owner as privilged
- SAUCE: ima/evm: Allow root in s_user_ns to set xattrs
- SAUCE: block_dev: Forbid unprivileged mounting when device is opened for
writing
- SAUCE: ext4: Add support for unprivileged mounts from user namespaces
- SAUCE: ext4: Add module parameter to enable user namespace mounts
- SAUCE: fuse: Add module parameter to enable user namespace mounts
* Miscellaneous upstream changes
- megaraid: Fix possible NULL pointer deference in mraid_mm_ioctl
- libahci: Implement the capability to override the generic ahci interrupt
handler.
- ata: Remove the AHCI_HFLAG_EDGE_IRQ support from libahci.
- ahci_xgene: Implement the workaround to fix the missing of the edge
interrupt for the HOST_IRQ_STAT.
-- Tim Gardner <tim.gard...@canonical.com> Fri, 12 Feb 2016 09:49:05
-0700
** Changed in: linux (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1545542
Title:
Enable arm64 emulation of removed ARMv7 instructions
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Wily:
Fix Committed
Status in linux source package in Xenial:
Fix Released
Bug description:
Linux now supports emulation of three deprecated ARMv7 features that
were removed from ARMv8: SWP(B), CP15ISB/DSB/DMB, and SETEND. At least
CP15DMB is used by some armhf archive binaries (notably pandoc), so we
need emulation enabled on the kernels that scalingstack uses.
I haven't checked which version added which, but they appeared some
time between 3.13 and 4.2, and I only care about 4.2 onwards. So
please enable ARMV8_DEPRECATED, SWP_EMULATION, CP15_BARRIER_EMULATION
and SETEND_EMULATION in arm64 kernels for wily onwards.
To manage notifications about this bug go to:
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