[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Tags added: cscc
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Changed in: ubuntu-power-systems
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Changed in: linux (Ubuntu Cosmic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
This bug was fixed in the package linux - 4.15.0-24.26
---
linux (4.15.0-24.26) bionic; urgency=medium
* linux: 4.15.0-24.26 -proposed tracker (LP: #1776338)
* Bionic update: upstream stable patchset 2018-06-06 (LP: #1775483)
- drm: bridge: dw-hdmi: Fix overflow workaround for Amlogic Meson GX SoCs
- i40e: Fix attach VF to VM issue
- tpm: cmd_ready command can be issued only after granting locality
- tpm: tpm-interface: fix tpm_transmit/_cmd kdoc
- tpm: add retry logic
- Revert "ath10k: send (re)assoc peer command when NSS changed"
- bonding: do not set slave_dev npinfo before slave_enable_netpoll in
bond_enslave
- ipv6: add RTA_TABLE and RTA_PREFSRC to rtm_ipv6_policy
- ipv6: sr: fix NULL pointer dereference in seg6_do_srh_encap()- v4 pkts
- KEYS: DNS: limit the length of option strings
- l2tp: check sockaddr length in pppol2tp_connect()
- net: validate attribute sizes in neigh_dump_table()
- llc: delete timers synchronously in llc_sk_free()
- tcp: don't read out-of-bounds opsize
- net: af_packet: fix race in PACKET_{R|T}X_RING
- tcp: md5: reject TCP_MD5SIG or TCP_MD5SIG_EXT on established sockets
- net: fix deadlock while clearing neighbor proxy table
- team: avoid adding twice the same option to the event list
- net/smc: fix shutdown in state SMC_LISTEN
- team: fix netconsole setup over team
- packet: fix bitfield update race
- tipc: add policy for TIPC_NLA_NET_ADDR
- pppoe: check sockaddr length in pppoe_connect()
- vlan: Fix reading memory beyond skb->tail in skb_vlan_tagged_multi
- amd-xgbe: Add pre/post auto-negotiation phy hooks
- sctp: do not check port in sctp_inet6_cmp_addr
- amd-xgbe: Improve KR auto-negotiation and training
- strparser: Do not call mod_delayed_work with a timeout of LONG_MAX
- amd-xgbe: Only use the SFP supported transceiver signals
- strparser: Fix incorrect strp->need_bytes value.
- net: sched: ife: signal not finding metaid
- tcp: clear tp->packets_out when purging write queue
- net: sched: ife: handle malformed tlv length
- net: sched: ife: check on metadata length
- llc: hold llc_sap before release_sock()
- llc: fix NULL pointer deref for SOCK_ZAPPED
- net: ethernet: ti: cpsw: fix tx vlan priority mapping
- virtio_net: split out ctrl buffer
- virtio_net: fix adding vids on big-endian
- KVM: s390: force bp isolation for VSIE
- s390: correct module section names for expoline code revert
- microblaze: Setup dependencies for ASM optimized lib functions
- commoncap: Handle memory allocation failure.
- scsi: mptsas: Disable WRITE SAME
- cdrom: information leak in cdrom_ioctl_media_changed()
- m68k/mac: Don't remap SWIM MMIO region
- block/swim: Check drive type
- block/swim: Don't log an error message for an invalid ioctl
- block/swim: Remove extra put_disk() call from error path
- block/swim: Rename macros to avoid inconsistent inverted logic
- block/swim: Select appropriate drive on device open
- block/swim: Fix array bounds check
- block/swim: Fix IO error at end of medium
- tracing: Fix missing tab for hwlat_detector print format
- s390/cio: update chpid descriptor after resource accessibility event
- s390/dasd: fix IO error for newly defined devices
- s390/uprobes: implement arch_uretprobe_is_alive()
- ACPI / video: Only default only_lcd to true on Win8-ready _desktops_
- docs: ip-sysctl.txt: fix name of some ipv6 variables
- net: mvpp2: Fix DMA address mask size
- net: stmmac: Disable ACS Feature for GMAC >= 4
- l2tp: hold reference on tunnels in netlink dumps
- l2tp: hold reference on tunnels printed in pppol2tp proc file
- l2tp: hold reference on tunnels printed in l2tp/tunnels debugfs file
- l2tp: fix {pppol2tp, l2tp_dfs}_seq_stop() in case of seq_file overflow
- s390/qeth: fix error handling in adapter command callbacks
- s390/qeth: avoid control IO completion stalls
- s390/qeth: handle failure on workqueue creation
- bnxt_en: Fix memory fault in bnxt_ethtool_init()
- virtio-net: add missing virtqueue kick when flushing packets
- VSOCK: make af_vsock.ko removable again
- hwmon: (k10temp) Add temperature offset for Ryzen 2700X
- hwmon: (k10temp) Add support for AMD Ryzen w/ Vega graphics
- s390/cpum_cf: rename IBM z13/z14 counter names
- kprobes: Fix random address output of blacklist file
- Revert "pinctrl: intel: Initialize GPIO properly when used through
irqchip"
* Lenovo V330 needs patch in ideapad_laptop module for rfkill (LP: #1774636)
- SAUCE: Add Lenovo V330 to the ideapad_laptop rfkill blacklist
* bluetooth controller fail after suspend with USB autosuspend on XPS 13 9360
(LP: #1775217)
- Bluetooth: btusb: Add Dell XPS 13 9360 to btusb_needs_reset_resume_table
* [Hyper-V] PCI: hv: Fix 2 hang issues in hv_compose_msi
[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
--- Comment From kamale...@in.ibm.com 2018-06-15 04:33 EDT---
The proposed Bionic kernel enables the 'Implement reliable stack tracing for
the consistency model' patch.
In brief:
After upgrading the system by enabling bionic-proposed to sources.list:
deb http://archive.ubuntu.com/ubuntu/ bionic-proposed restricted main
multiverse universe
system booted into kernel version 4.15.0-24-generic, using 4.15.0-24-generic
sources (apt source linux) to build livepatch modules:
# insmod ./livepatch-0001-mm-thp-Do-not-make-page-table-dir.ko
# dmesg
.
[ 1827.037453] livepatch_0001_mm_thp_Do_not_make_page_table_dir: loading
out-of-tree module taints kernel.
[ 1827.037458] livepatch_0001_mm_thp_Do_not_make_page_table_dir: tainting
kernel with TAINT_LIVEPATCH
[ 1827.043106] livepatch_0001_mm_thp_Do_not_make_page_table_dir: module
verification failed: signature and/or required key missing - tainting kernel
[ 1827.176933] livepatch: enabling patch
'livepatch_0001_mm_thp_Do_not_make_page_table_dir'
[ 1827.179784] livepatch: 'livepatch_0001_mm_thp_Do_not_make_page_table_dir':
starting patching transition
[ 1827.179785] livepatch: 'livepatch_0001_mm_thp_Do_not_make_page_table_dir':
patching complete
[ 2526.521348] livepatch: 'livepatch_0001_mm_thp_Do_not_make_page_table_dir':
starting unpatching transition
[ 2526.525554] livepatch: 'livepatch_0001_mm_thp_Do_not_make_page_table_dir':
unpatching complete
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Fix Committed
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
This bug is awaiting verification that the 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!
** Tags added: verification-needed-bionic
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Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Fix Committed
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Fix Committed
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Changed in: ubuntu-power-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
In Progress
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
In Progress
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-May/092679.html
** Description changed:
- == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 ==
- Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it
uses kGraft's per-task consistency and syscall barrier switching combined with
kpatch's stack trace switching. The current approach is stack checking of
sleeping tasks. If no affected functions are on the stack of a given task, the
task is patched. In most cases this will patch most or all of the tasks on the
first try. Otherwise, it'll keep trying periodically. This patch implements
the reliable stack tracing for consistency model a.k.a
HAVE_RELIABLE_STACKTRACE.
+ == SRU Justification ==
+ Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
+ it uses kGraft's per-task consistency and syscall barrier switching
+ combined with kpatch's stack trace switching. The current approach is
+ stack checking of sleeping tasks. If no affected functions are on the
+ stack of a given task, the task is patched. In most cases this will patch
+ most or all of the tasks on the first try. Otherwise, it'll keep trying
+ periodically. This patch implements the reliable stack tracing for
+ consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
- This will help in switching livepatching implementation to basic per-
- task consistency model. It is the foundation, which will help us enable
- security patches changing function or data semantics. This is the
- biggest remaining piece needed on ppc64le to make livepatch more
- generally useful.
+ This will help in switching livepatching implementation to basic per-task
+ consistency model. It is the foundation, which will help us enable
+ security patches changing function or data semantics. This is the biggest
+ remaining piece needed on ppc64le to make livepatch more generally useful.
+
+ == Fix ==
+ df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
+
+ == Regression Potential ==
+ Low. Limited to powerpc.
+
+ == Test Case ==
+ A test kernel was built with this patch and tested by the original bug
reporter.
+ The bug reporter states the test kernel resolved the bug.
+
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
In Progress
Status in linux source package in Cosmic:
In Progress
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
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[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Changed in: ubuntu-power-systems Status: Triaged => In Progress -- 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/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model Status in The Ubuntu-power-systems project: In Progress Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Cosmic: In Progress Bug description: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching. The current approach is stack checking of sleeping tasks. If no affected functions are on the stack of a given task, the task is patched. In most cases this will patch most or all of the tasks on the first try. Otherwise, it'll keep trying periodically. This patch implements the reliable stack tracing for consistency model a.k.a HAVE_RELIABLE_STACKTRACE. This will help in switching livepatching implementation to basic per- task consistency model. It is the foundation, which will help us enable security patches changing function or data semantics. This is the biggest remaining piece needed on ppc64le to make livepatch more generally useful. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
I built a new test kernel and included the source package. The test kernel can be downloaded from: http://kernel.ubuntu.com/~jsalisbury/lp1771844 -- 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/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model Status in The Ubuntu-power-systems project: Triaged Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Cosmic: In Progress Bug description: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching. The current approach is stack checking of sleeping tasks. If no affected functions are on the stack of a given task, the task is patched. In most cases this will patch most or all of the tasks on the first try. Otherwise, it'll keep trying periodically. This patch implements the reliable stack tracing for consistency model a.k.a HAVE_RELIABLE_STACKTRACE. This will help in switching livepatching implementation to basic per- task consistency model. It is the foundation, which will help us enable security patches changing function or data semantics. This is the biggest remaining piece needed on ppc64le to make livepatch more generally useful. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
I built a test kernel with commit df78d3f6148092d33a9a24c7a9cfac3d0220b484. The test kernel can be downloaded from: http://kernel.ubuntu.com/~jsalisbury/lp1771844 Can you test this kernel and see if it resolves this bug? Note about installing test kernels: • If the test kernel is prior to 4.15(Bionic) you need to install the linux-image and linux-image-extra .deb packages. • If the test kernel is 4.15(Bionic) or newer, you need to install the linux-image-unsigned, linux-modules and linux-modules-extra .deb packages. Thanks in advance! -- 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/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model Status in The Ubuntu-power-systems project: Triaged Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Cosmic: In Progress Bug description: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching. The current approach is stack checking of sleeping tasks. If no affected functions are on the stack of a given task, the task is patched. In most cases this will patch most or all of the tasks on the first try. Otherwise, it'll keep trying periodically. This patch implements the reliable stack tracing for consistency model a.k.a HAVE_RELIABLE_STACKTRACE. This will help in switching livepatching implementation to basic per- task consistency model. It is the foundation, which will help us enable security patches changing function or data semantics. This is the biggest remaining piece needed on ppc64le to make livepatch more generally useful. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: New => Triaged ** Also affects: linux (Ubuntu Cosmic) Importance: High Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: Triaged ** Also affects: linux (Ubuntu Bionic) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Bionic) Status: New => In Progress ** Changed in: linux (Ubuntu Cosmic) Status: Triaged => In Progress ** Changed in: linux (Ubuntu Bionic) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu Cosmic) Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu Bionic) Importance: Undecided => High -- 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/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model Status in The Ubuntu-power-systems project: Triaged Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Cosmic: In Progress Bug description: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching. The current approach is stack checking of sleeping tasks. If no affected functions are on the stack of a given task, the task is patched. In most cases this will patch most or all of the tasks on the first try. Otherwise, it'll keep trying periodically. This patch implements the reliable stack tracing for consistency model a.k.a HAVE_RELIABLE_STACKTRACE. This will help in switching livepatching implementation to basic per- task consistency model. It is the foundation, which will help us enable security patches changing function or data semantics. This is the biggest remaining piece needed on ppc64le to make livepatch more generally useful. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Tags removed: targetmilestone-inin18041 ** Tags added: targetmilestone-inin1804 -- 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/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model Status in The Ubuntu-power-systems project: Triaged Status in linux package in Ubuntu: New Bug description: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching. The current approach is stack checking of sleeping tasks. If no affected functions are on the stack of a given task, the task is patched. In most cases this will patch most or all of the tasks on the first try. Otherwise, it'll keep trying periodically. This patch implements the reliable stack tracing for consistency model a.k.a HAVE_RELIABLE_STACKTRACE. This will help in switching livepatching implementation to basic per- task consistency model. It is the foundation, which will help us enable security patches changing function or data semantics. This is the biggest remaining piece needed on ppc64le to make livepatch more generally useful. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Tags removed: targetmilestone-inin1804 ** Tags added: targetmilestone-inin18041 -- 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/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model Status in The Ubuntu-power-systems project: Triaged Status in linux package in Ubuntu: New Bug description: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching. The current approach is stack checking of sleeping tasks. If no affected functions are on the stack of a given task, the task is patched. In most cases this will patch most or all of the tasks on the first try. Otherwise, it'll keep trying periodically. This patch implements the reliable stack tracing for consistency model a.k.a HAVE_RELIABLE_STACKTRACE. This will help in switching livepatching implementation to basic per- task consistency model. It is the foundation, which will help us enable security patches changing function or data semantics. This is the biggest remaining piece needed on ppc64le to make livepatch more generally useful. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1771844] Re: powerpc/livepatch: Implement reliable stack tracing for the consistency model
** Also affects: ubuntu-power-systems Importance: Undecided Status: New ** Changed in: ubuntu-power-systems Status: New => Triaged ** Tags added: triage-g ** Changed in: ubuntu-power-systems Importance: Undecided => High ** Changed in: ubuntu-power-systems Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team) -- 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/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model Status in The Ubuntu-power-systems project: Triaged Status in linux package in Ubuntu: New Bug description: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == Livepatch has a consistency model which is a hybrid of kGraft and kpatch: it uses kGraft's per-task consistency and syscall barrier switching combined with kpatch's stack trace switching. The current approach is stack checking of sleeping tasks. If no affected functions are on the stack of a given task, the task is patched. In most cases this will patch most or all of the tasks on the first try. Otherwise, it'll keep trying periodically. This patch implements the reliable stack tracing for consistency model a.k.a HAVE_RELIABLE_STACKTRACE. This will help in switching livepatching implementation to basic per- task consistency model. It is the foundation, which will help us enable security patches changing function or data semantics. This is the biggest remaining piece needed on ppc64le to make livepatch more generally useful. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
