support the slub_debug boot option on specific object size

[Gavin Guo]

[Impact]

slub_debug cannot work for specific kmem_cache size.

e. g. slub_debug=PU,kmalloc-1024

The slub_debug is used to enable the debugging of use-after-free, poison
overwritten, double free. And it also increases the up time of the server
when the above mentioned errors happen instead of crashing immediately.

However, currently, there exists bug that the slub_debug cannot be applied
for the specific object size. This is not helpful to enable the whole
system slub_debug because the performance loss will be up to 20%~30%
according to the customer's measurement. The patch here to limit the
slub_debug only on the specific object size to alleviate the performance
loss.

[Fix]

The slub_debug=PU,kmalloc-xx cannot work because in the
create_kmalloc_caches() the s->name is created after the
create_kmalloc_cache() is called. The name is NULL in the
create_kmalloc_cache() so the kmem_cache_flags() would not set the
slub_debug flags to the s->flags. The fix here set up a kmalloc_names
string array for the initialization purpose and delete the dynamic name
creation of kmalloc_caches.

[Test case]

Install the patched kernel.
sudo reboot

sudo vim /etc/default/grub
append "slub_debug=FPZU,kmalloc-1024" to GRUB_CMDLINE_LINUX_DEFAULT
sudo update-grub
sudo reboot

# Check if the kmalloc-1024 debug options are enabled
sudo cat /sys/kernel/slab/kmalloc-1024/sanity_checks
# shoulb be 1
sudo cat /sys/kernel/slab/kmalloc-1024/red_zone
# shoulb be 1
sudo cat /sys/kernel/slab/kmalloc-1024/poison
# shoulb be 1

# Check other object size
sudo cat /sys/kernel/slab/kmalloc-8/sanity_checks
# shoulb be 0
sudo cat /sys/kernel/slab/kmalloc-8/red_zone
# shoulb be 0
sudo cat /sys/kernel/slab/kmalloc-8/poison
# shoulb be 0

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1456952

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.

[Brad Figg (brad-figg)]

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-trusty' to 'verification-done-trusty'.

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!

[Brad Figg (brad-figg)]

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-utopic' to 'verification-done-utopic'.

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!

[Brad Figg (brad-figg)]

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-vivid' to 'verification-done-vivid'.

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!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.19.0-23.24

---------------
linux (3.19.0-23.24) vivid; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1472346

  [ Chris J Arges ]

  * SAUCE: Don't use atomic read in evlist.c
    - LP: #1410673

linux (3.19.0-23.23) vivid; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1472048

  [ Chris J Arges ]

  * [Config] Add CRYPTO_DEV_NX_*, 842_* as modules
    - LP: #1454687

  [ Lu, Han ]

  * SAUCE: i915_bpo: drm/i915/audio: add codec wakeup override
    enabled/disable callback
    - LP: #1460674

  [ Timo Aaltonen ]

  * SAUCE: Backport I915_OVERLAY_DISABLE_DEST_COLORKEY
    - LP: #1460674
  * SAUCE: i915_bpo: Rebase to drm-intel-next-fixes-2015-05-29
    - LP: #1460674
  * SAUCE: i915_bpo: Revert "drm/i915: Implement the intel_dp_autotest_edid
    function for DP EDID complaince tests"
    - LP: #1460674
  * SAUCE: i915_bpo: Revert "drm/i915: Add debugfs test control files for
    Displayport compliance testing"
    - LP: #1460674
  * SAUCE: Load i915_bpo from the hda driver on SKL/CHV
    - LP: #1460674
  * SAUCE: i915_bpo: Don't try to support BXT
    - LP: #1460674
  * SAUCE: i915_bpo: drm/i915/skl: Fix DMC API version.

  [ Upstream Kernel Changes ]

  * Revert "usb: dwc2: add bus suspend/resume for dwc2"
    - LP: #1471252
  * Revert "HID: logitech-hidpp: support combo keyboard touchpad TK820"
    - LP: #1471252
  * Revert "KVM: x86: drop fpu_activate hook"
    - LP: #1471252
  * Revert "libceph: clear r_req_lru_item in __unregister_linger_request()"
    - LP: #1471252
  * drm/i915: add component support
    - LP: #1460661
  * ALSA: hda: export struct hda_intel
    - LP: #1460661
  * ALSA: hda: pass intel_hda to all i915 interface functions
    - LP: #1460661
  * ALSA: hda: add component support
    - LP: #1460661
  * drm/atomic-helpers: Fix documentation typos and wrong copy&paste
    - LP: #1460674
  * drm/atomic: Rename drm_atomic_helper_commit_pre_planes() state argument
    - LP: #1460674
  * drm/atomic-helper: Rename commmit_post/pre_planes
    - LP: #1460674
  * drm/atomic-helpers: make mode_set hooks optional
    - LP: #1460674
  * drm/atomic-helper: Fix kerneldoc for prepare_planes
    - LP: #1460674
  * drm: Complete moving rotation property to core
    - LP: #1460674
  * drm: Share plane pixel format check code between legacy and atomic
    - LP: #1460674
  * drm/atomic: Constify a bunch of functions pointer structs
    - LP: #1460674
  * drm: Fix some typo mistake of the annotations
    - LP: #1460674
  * drm: change connector to tmp_connector
    - LP: #1460674
  * drm: atomic: Expose CRTC active property
    - LP: #1460674
  * drm: atomic: Allow setting CRTC active property
    - LP: #1460674
  * drm/atomic-helpers: Properly avoid full modeset dance
    - LP: #1460674
  * drm/atomic: Add helpers for state-subclassing drivers
    - LP: #1460674
  * drm: Fix some typos
    - LP: #1460674
  * drm/atomic: Add for_each_{connector,crtc,plane}_in_state helper macros
    - LP: #1460674
  * drm/atomic-helper: Don't call atomic_update_plane when it stays off
    - LP: #1460674
  * drm/atomic-helper: Really recover pre-atomic plane/cursor behavior
 ...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.16.0-44.59

---------------
linux (3.16.0-44.59) utopic; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1472030

  [ Iyappan Subramanian ]

  * SAUCE: (no-up) drivers: net: xgene: fix: Out of order descriptor bytes
    read
    - LP: #1425576

  [ Upstream Kernel Changes ]

  * Revert "tools/vm: fix page-flags build"
    - LP: #1471170
  * NVMe: Add shutdown timeout as module parameter.
    - LP: #1465136
  * Drivers: hv: vmbus: Add support for VMBus panic notifier handler
    - LP: #1463584
  * Drivers: hv: vmbus: Correcting truncation error for constant
    HV_CRASH_CTL_CRASH_NOTIFY
    - LP: #1463584
  * KVM: nVMX: fix lifetime issues for vmcs02
    - LP: #1448269
  * KVM: nVMX: Fix nested vmexit ack intr before load vmcs01
    - LP: #1448269
  * mm/slab_common: support the slub_debug boot option on specific object
    size
    - LP: #1456952
  * kvm: x86: fix kvm_apic_has_events to check for NULL pointer
  * cpuidle: powernv: Populate cpuidle state details by querying the
    device-tree
    - LP: #1470404
  * cpuidle: powernv: Read target_residency value of idle states from DT if
    available
    - LP: #1470404
  * cpuidle: powernv: Avoid endianness conversions while parsing DT
    - LP: #1470404
  * cpuidle: powernv/pseries: Auto-promotion of snooze to deeper idle state
    - LP: #1470404
  * iio: adis16400: Report pressure channel scale
    - LP: #1471170
  * iio: adis16400: Use != channel indices for the two voltage channels
    - LP: #1471170
  * iio: adis16400: Compute the scan mask from channel indices
    - LP: #1471170
  * iio: adis16400: Remove unused variable
    - LP: #1471170
  * iio: adis16400: Fix burst mode
    - LP: #1471170
  * iio: adis16400: Fix burst transfer for adis16448
    - LP: #1471170
  * USB: serial: ftdi_sio: Add support for a Motion Tracker Development
    Board
    - LP: #1471170
  * iio: adc: twl6030-gpadc: Fix modalias
    - LP: #1471170
  * serial: imx: Fix DMA handling for IDLE condition aborts
    - LP: #1471170
  * usb: dwc3: gadget: Fix incorrect DEPCMD and DGCMD status macros
    - LP: #1471170
  * ALSA: usb-audio: Add mic volume fix quirk for Logitech Quickcam Fusion
    - LP: #1471170
  * n_tty: Fix auditing support for cannonical mode
    - LP: #1471170
  * drm/i915/hsw: Fix workaround for server AUX channel clock divisor
    - LP: #1471170
  * x86/asm/irq: Stop relying on magic JMP behavior for early_idt_handlers
    - LP: #1471170
  * lib: Fix strnlen_user() to not touch memory after specified maximum
    - LP: #1471170
  * Input: elantech - fix detection of touchpads where the revision matches
    a known rate
    - LP: #1471170
  * ALSA: hda/realtek - Add a fixup for another Acer Aspire 9420
    - LP: #1471170
  * ALSA: usb-audio: add MAYA44 USB+ mixer control names
    - LP: #1471170
  * ALSA: usb-audio: fix missing input volume controls in MAYA44 USB(+)
    - LP: #1471170
  * USB: cp210x: add ID for HubZ dual ZigBee and Z-Wave dongle
    - LP: #1471170
  * Input: elantech - add new icbody type
    - LP: #1471170
  * MIPS: Fix enabling of DEBUG_STACKOVERFLOW
    - LP: #1471170
  * xfrm: fix a race in xfrm_state_lookup_byspi
    ...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.13.0-58.97

---------------
linux (3.13.0-58.97) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1472453

  [ Upstream Kernel Changes ]

  * vm: Fix incomplete backport of VM_FAULT_SIGSEGV handling support
    - LP: #1471892

linux (3.13.0-58.96) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1471991

  [ Iyappan Subramanian ]

  * SAUCE: (no-up): drivers: net: xgene: fix: Out of order descriptor bytes
    read
    - LP: #1425576

  [ Upstream Kernel Changes ]

  * NVMe: Add shutdown timeout as module parameter.
    - LP: #1465136
  * Drivers: hv: vmbus: Add support for VMBus panic notifier handler
    - LP: #1463584
  * Drivers: hv: vmbus: Correcting truncation error for constant
    HV_CRASH_CTL_CRASH_NOTIFY
    - LP: #1463584
  * netfilter: nf_conntrack: don't release a conntrack with non-zero refcnt
    - LP: #1466135
  * lpfc: Add iotag memory barrier
    - LP: #1468416
  * mm/slab_common: support the slub_debug boot option on specific object
    size
    - LP: #1456952
  * pipe: iovec: Fix memory corruption when retrying atomic copy as
    non-atomic
    - CVE-2015-1805
  * kvm: x86: fix kvm_apic_has_events to check for NULL pointer
  * staging, rtl8192e, LLVMLinux: Change extern inline to static inline
    - LP: #1471233
  * kernel: use the gnu89 standard explicitly
    - LP: #1471233
  * staging, rtl8192e, LLVMLinux: Remove unused inline prototype
    - LP: #1471233
  * staging: rtl8712, rtl8712: avoid lots of build warnings
    - LP: #1471233
  * qla2xxx: remove redundant declaration in 'qla_gbl.h'
    - LP: #1471233
  * staging: wlags49_h2: fix extern inline functions
    - LP: #1471233
  * ARM: 8307/1: psci: move psci firmware calls out of line
    - LP: #1471233
  * kconfig: Fix warning "‘jump’ may be used uninitialized"
    - LP: #1471233
  * scripts/sortextable: suppress warning: `relocs_size' may be used
    uninitialized
    - LP: #1471233
  * ASoC: dapm: Enable autodisable on SOC_DAPM_SINGLE_TLV_AUTODISABLE
    - LP: #1471233
  * ALSA: hda - Fix mute-LED fixed mode
    - LP: #1471233
  * ALSA: emu10k1: Fix card shortname string buffer overflow
    - LP: #1471233
  * ALSA: emux: Fix mutex deadlock at unloading
    - LP: #1471233
  * drm/radeon: add SI DPM quirk for Sapphire R9 270 Dual-X 2G GDDR5
    - LP: #1471233
  * SCSI: add 1024 max sectors black list flag
    - LP: #1471233
  * 3w-sas: fix command completion race
    - LP: #1471233
  * 3w-xxxx: fix command completion race
    - LP: #1471233
  * 3w-9xxx: fix command completion race
    - LP: #1471233
  * serial: xilinx: Use platform_get_irq to get irq description structure
    - LP: #1471233
  * serial: of-serial: Remove device_type = "serial" registration
    - LP: #1471233
  * tty/serial: at91: maxburst was missing for dma transfers
    - LP: #1471233
  * ALSA: emux: Fix mutex deadlock in OSS emulation
    - LP: #1471233
  * ALSA: emu10k1: Emu10k2 32 bit DMA mode
    - LP: #1471233
  * rbd: end I/O the entire obj_request on error
    - LP: #1471233
  * powerpc/pseries: Correct cpu affinity for dlpar added cpus
    - LP: #1471233
  * bridge/mdb: remove wrong use of NLM_F_MULT...