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The bpf_skb_adjust_net() ignores the return value of bpf_skb_net_shrink/grow,
and always return 0, fix it by return 'ret'.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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There is a flaw in the Hyper-V SynIC implementation in KVM: when message
page or event flags page is enabled by setting the corresponding msr,
KVM zeroes it out. This is problematic because on migration the
corresponding MSRs are loaded on the destination, so the content of
those pages is lost.
This went unnoticed so far because the only user of those pages was
in-KVM hyperv synic timers, which could continue working despite that
zeroing.
Newer QEMU uses those pages for Hyper-V VMBus implementation, and
zeroing them breaks the migration.
Besides, in newer QEMU the content of those pages is fully managed by
QEMU, so zeroing them is undesirable even when writing the MSRs from the
guest side.
To support this new scheme, introduce a new capability,
KVM_CAP_HYPERV_SYNIC2, which, when enabled, makes sure that the synic
pages aren't zeroed out in KVM.
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
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The backwards_tsc_observed global introduced in commit 16a9602 is never
reset to false. If a VM happens to be running while the host is suspended
(a common source of the TSC jumping backwards), master clock will never
be enabled again for any VM. In contrast, if no VM is running while the
host is suspended, master clock is unaffected. This is inconsistent and
unnecessarily strict. Let's track the backwards_tsc_observed variable
separately and let each VM start with a clean slate.
Real world impact: My Windows VMs get slower after my laptop undergoes a
suspend/resume cycle. The only way to get the perf back is unloading and
reloading the kvm module.
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
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Now that input core insists on having dev->absinfo when device claims to
generate EV_ABS in its dev->evbit, we should not be blindly setting that
bit.
The code in question might have been needed before input_set_abs_params()
started setting EV_ABS in device's evbit, but not anymore, and is now
breaking devices such as SMART SPNL-6075 Touchscreen.
Fixes: 6ecfe51b4082 ("Input: refuse to register absolute devices ...")
Reported-by: Matthias Fend <Matthias.Fend@wolfvision.net>
Tested-by: Matthias Fend <Matthias.Fend@wolfvision.net>
Cc: stable@vger.kernel.org
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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No need to return value in queue work, kill ret variable.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Buffer heads referencing indirect blocks may not be released if the file
is truncated at the right time. This happens because ext2_get_branch()
returns NULL when it finds the whole chain of indirect blocks already
set, and when truncate alters the chain this value of NULL is
treated as the address of the last head to be released. Handle this in the
same way as it's done after the got_it label.
Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
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The existing code gives an incorrect pointer value.
The buffer pointer 'buf' was of type unsigned short *, and 'count' was a
number in bytes. A cast of buf should have been used.
However, instead of casting, just change the code to use u32 pointers.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 8185e51f358a: ("mmc: tmio-mmc: add support for 32bit data port")
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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We don't need to adjust priority before adding a new pi_waiter, the
priority only needs to be updated after pi_waiter change or task
priority change.
Steven Rostedt pointed out:
"Interesting, I did some git mining and this was added with the original
entry of the rtmutex.c (23f78d4a03c5). Looking at even that version, I
don't see the purpose of adjusting the task prio here. It is done
before anything changes in the task."
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1499926704-28841-1-git-send-email-alex.shi@linaro.org
[ Enhance the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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The commit 304419d8a7e9 ("mmc: core: Allocate per-request data using the
block layer core"), refactored the mechanism of queue handling, but also
made mmc_init_request() to be called after mmc_cleanup_queue(). This
triggers a null pointer dereference:
[ 683.123791] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 683.123801] IP: mmc_init_request+0x2c/0xf0 [mmc_block]
...
[ 683.123905] Call Trace:
[ 683.123913] alloc_request_size+0x4f/0x70
[ 683.123919] mempool_alloc+0x5f/0x150
[ 683.123925] ? __enqueue_entity+0x6c/0x70
[ 683.123928] get_request+0x3ad/0x720
[ 683.123933] ? prepare_to_wait_event+0x110/0x110
[ 683.123937] blk_queue_bio+0xc1/0x3a0
[ 683.123940] generic_make_request+0xf8/0x2a0
[ 683.123942] submit_bio+0x75/0x150
[ 683.123947] submit_bio_wait+0x51/0x70
[ 683.123951] blkdev_issue_flush+0x5c/0x90
[ 683.123956] ext4_sync_fs+0x171/0x1b0
[ 683.123961] sync_filesystem+0x73/0x90
[ 683.123965] fsync_bdev+0x24/0x50
[ 683.123971] invalidate_partition+0x24/0x50
[ 683.123973] del_gendisk+0xb2/0x2a0
[ 683.123977] mmc_blk_remove_req.part.38+0x71/0xa0 [mmc_block]
[ 683.123980] mmc_blk_remove+0xba/0x190 [mmc_block]
[ 683.123990] mmc_bus_remove+0x1a/0x20 [mmc_core]
[ 683.123995] device_release_driver_internal+0x141/0x200
[ 683.123999] device_release_driver+0x12/0x20
[ 683.124001] bus_remove_device+0xfd/0x170
[ 683.124004] device_del+0x1e8/0x330
[ 683.124012] mmc_remove_card+0x60/0xc0 [mmc_core]
[ 683.124019] mmc_remove+0x19/0x30 [mmc_core]
[ 683.124025] mmc_stop_host+0xfb/0x1a0 [mmc_core]
[ 683.124032] mmc_remove_host+0x1a/0x40 [mmc_core]
[ 683.124037] sdhci_remove_host+0x2e/0x1c0 [mmc_sdhci]
[ 683.124042] sdhci_pci_remove_slot+0x3f/0x80 [sdhci_pci]
[ 683.124045] sdhci_pci_remove+0x39/0x70 [sdhci_pci]
[ 683.124049] pci_device_remove+0x39/0xc0
[ 683.124052] device_release_driver_internal+0x141/0x200
[ 683.124056] driver_detach+0x3f/0x80
[ 683.124059] bus_remove_driver+0x55/0xd0
[ 683.124062] driver_unregister+0x2c/0x50
[ 683.124065] pci_unregister_driver+0x29/0x90
[ 683.124069] sdhci_driver_exit+0x10/0x4f3 [sdhci_pci]
[ 683.124073] SyS_delete_module+0x171/0x250
[ 683.124078] entry_SYSCALL_64_fastpath+0x1e/0xa9
Fix this by setting the queue DYING flag before cleanup the queue, as it
prevents new reqs from entering the queue.
Signed-off-by: Grzegorz Sluja <grzegorzx.sluja@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Fixes: 304419d8a7e9 ("mmc: core: Allocate per-request data using the...")
[Ulf: Updated the changelog]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Pull perf/urgent fix from Arnaldo Carvalho de Melo:
- Accept zero as the kernel base address, to resolve symbols on
architectures that don't partition the virtual address space in
kernel/user, S/390, is one of such architectures and was where
this problem was noticed. (Arnaldo Carvalho de Melo)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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This extends the existing set of bulk helpers with prepare_enable and
disable_unprepare variants.
Cc: Russell King <linux@armlinux.org.uk>,
Cc: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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into drm-next
single r700 fix.
* 'drm-next-4.13' of git://people.freedesktop.org/~agd5f/linux:
drm/radeon: Fix eDP for single-display iMac10,1 (v2)
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git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull sysctl fix from Eric Biederman:
"A rather embarassing and hard to hit bug was merged into 4.11-rc1.
Andrei Vagin tracked this bug now and after some staring at the code
I came up with a fix"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
proc: Fix proc_sys_prune_dcache to hold a sb reference
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Pull networking fixes from David Miller:
1) Fix 64-bit division in mlx5 IPSEC offload support, from Ilan Tayari
and Arnd Bergmann.
2) Fix race in statistics gathering in bnxt_en driver, from Michael
Chan.
3) Can't use a mutex in RCU reader protected section on tap driver, from
Cong WANG.
4) Fix mdb leak in bridging code, from Eduardo Valentin.
5) Fix free of wrong pointer variable in nfp driver, from Dan Carpenter.
6) Buffer overflow in brcmfmac driver, from Arend van SPriel.
7) ioremap_nocache() return value needs to be checked in smsc911x
driver, from Alexey Khoroshilov.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (34 commits)
net: stmmac: revert "support future possible different internal phy mode"
sfc: don't read beyond unicast address list
datagram: fix kernel-doc comments
socket: add documentation for missing elements
smsc911x: Add check for ioremap_nocache() return code
brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()
net: hns: Bugfix for Tx timeout handling in hns driver
net: ipmr: ipmr_get_table() returns NULL
nfp: freeing the wrong variable
mlxsw: spectrum_switchdev: Check status of memory allocation
mlxsw: spectrum_switchdev: Remove unused variable
mlxsw: spectrum_router: Fix use-after-free in route replace
mlxsw: spectrum_router: Add missing rollback
samples/bpf: fix a build issue
bridge: mdb: fix leak on complete_info ptr on fail path
tap: convert a mutex to a spinlock
cxgb4: fix BUG() on interrupt deallocating path of ULD
qed: Fix printk option passed when printing ipv6 addresses
net: Fix minor code bug in timestamping.txt
net: stmmac: Make 'alloc_dma_[rt]x_desc_resources()' look even closer
...
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I made the mistake of upgrading my desktop to the new Fedora 26 that
comes with gcc-7.1.1.
There's nothing wrong per se that I've noticed, but I now have 1500
lines of warnings, mostly from the new format-truncation warning
triggering all over the tree.
We use 'snprintf()' and friends in a lot of places, and often know that
the numbers are fairly small (ie a controller index or similar), but gcc
doesn't know that, and sees an 'int', and thinks that it could be some
huge number. And then complains when our buffers are not able to fit
the name for the ten millionth controller.
These warnings aren't necessarily bad per se, and we probably want to
look through them subsystem by subsystem, but at least during the merge
window they just mean that I can't even see if somebody is introducing
any *real* problems when I pull.
So warnings disabled for now.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://anongit.freedesktop.org/git/drm-misc into drm-next
Core Changes:
- Fix empty timestamps on hw without vlbank counter (Laurent)
- Clear atomic state before retrying ww/mutex acquisition in remove_fb (Maarten)
Driver Changes:
- rockchip: Fix incorrect NULL pointer check after allocation (Gustavo)
Cc: Gustavo A. R. Silva <garsilva@embeddedor.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
* tag 'drm-misc-next-fixes-2017-07-10' of git://anongit.freedesktop.org/git/drm-misc:
drm/rockchip: fix NULL check on devm_kzalloc() return value
drm/atomic: Add missing drm_atomic_state_clear to atomic_remove_fb
drm: vblank: Fix vblank timestamp update
DRM: Fix an incorrectly formatted table
bridge: Fix panel-bridge error return on !panel.
drm/rockchip: gem: add the lacks lock and trivial changes
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git://anongit.freedesktop.org/git/drm-intel into drm-next
drm/i915 fixes for v4.13-rc1
* tag 'drm-intel-next-fixes-2017-07-11' of git://anongit.freedesktop.org/git/drm-intel:
drm/i915: Make DP-MST connector info work
drm/i915/gvt: Use fence error from GVT request for workload status
drm/i915/gvt: remove scheduler_mutex in per-engine workload_thread
drm/i915/gvt: Revert "drm/i915/gvt: Fix possible recursive locking issue"
drm/i915/gvt: Audit the command buffer address
drm/i915/gvt: Fix a memory leak in intel_gvt_init_gtt()
drm/i915/fbdev: Check for existence of ifbdev->vma before operations
drm/i915: Hold RPM wakelock while initializing OA buffer
drm/i915/cnl: Fix the CURSOR_COEFF_MASK used in DDI Vswing Programming
drm/i915/cfl: Fix Workarounds.
drm/i915: Avoid undefined behaviour of "u32 >> 32"
drm/i915: reintroduce VLV/CHV PFI programming power domain workaround
drm/i915: Fix an error checking test
drm/i915: Disable MSI for all pre-gen5
drm/i915/gvt: Make function dpy_reg_mmio_readx safe
drm/i915/gvt: Don't read ADPA_CRT_HOTPLUG_MONITOR from host
drm/i915/gvt: Set initial PORT_CLK_SEL vreg for BDW
drm/i915/gvt: Fix inconsistent locks holding sequence
drm/i915/gvt: Fix possible recursive locking issue
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https://github.com/ckhu-mediatek/linux.git-tags into drm-next
This include new color format support and some fixups.
* 'mediatek-drm-next-4.13' of https://github.com/ckhu-mediatek/linux.git-tags:
drm/mediatek: separate color module to fixup error memory reallocation
drm/mediatek: check for memory allocation failure
drm/mediatek: re-phrase DRM_INFO error message
drm/mediatek: use platform_register_drivers
drm/mediatek: Support UYVY and YUYV format for overlay
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git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
Pull modules updates from Jessica Yu:
"Summary of modules changes for the 4.13 merge window:
- Minor code cleanups
- Avoid accessing mod struct prior to checking module struct version,
from Kees
- Fix racy atomic inc/dec logic of kmod_concurrent_max in kmod, from
Luis"
* tag 'modules-for-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
module: make the modinfo name const
kmod: reduce atomic operations on kmod_concurrent and simplify
module: use list_for_each_entry_rcu() on find_module_all()
kernel/module.c: suppress warning about unused nowarn variable
module: Add module name to modinfo
module: Pass struct load_info into symbol checks
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Commit 76cde7e49590 (PCI / PM: Make PCIe PME interrupts wake up from
suspend-to-idle) went too far with preventing pcie_pme_work_fn() from
clearing the root port's PME Status and re-enabling the PME interrupt
which should be done for PMEs to work correctly after system resume.
The failing scenario is as follows:
1. pcie_pme_suspend() finds that the PME IRQ should be designated
for system wakeup, so it calls enable_irq_wake() and then sets
data->suspend_level to PME_SUSPEND_WAKEUP.
2. PME interrupt happens at this point.
3. pcie_pme_irq() runs, disables the PME interrupt and queues up
the execution of pcie_pme_work_fn().
4. pcie_pme_work_fn() runs before pcie_pme_resume() and breaks out
of the loop right away, because data->suspend_level is not
PME_SUSPEND_NONE, and it doesn't re-enable the PME interrupt
for the same reason.
5. pcie_pme_resume() runs and simply calls disable_irq_wake()
without re-enabling the PME interrupt (because data->suspend_level
is not PME_SUSPEND_NONE), so the PME interrupt remains disabled
and the PME Status remains set.
To fix this notice that there is no reason why pcie_pme_work_fn()
should behave in a special way during system resume if the PME
interrupt is not disabled by pcie_pme_suspend() and partially revert
commit 76cde7e49590 and restore the previous (and correct) behavior
of pcie_pme_work_fn().
Fixes: 76cde7e49590 (PCI / PM: Make PCIe PME interrupts wake up from suspend-to-idle)
Reported-and-tested-by: Naresh Solanki <naresh.solanki@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
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Currently the writeback statistics code uses a percpu counters to hold
various statistics. Furthermore we have 2 families of functions - those
which disable local irq and those which doesn't and whose names begin
with double underscore. However, they both end up calling
__add_wb_stats which in turn calls percpu_counter_add_batch which is
already irq-safe.
Exploiting this fact allows to eliminated the __wb_* functions since
they don't add any further protection than we already have.
Furthermore, refactor the wb_* function to call __add_wb_stat directly
without the irq-disabling dance. This will likely result in better
runtime of code which deals with modifying the stat counters.
While at it also document why percpu_counter_add_batch is in fact
preempt and irq-safe since at least 3 people got confused.
Link: http://lkml.kernel.org/r/1498029937-27293-1-git-send-email-nborisov@suse.com
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Josef Bacik <jbacik@fb.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/667a515b8d0f10f2465d519f8595edd91552fc5e.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/bc5927726abc70d7c066df7ab4cb7cfce4a7b577.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
But there is an oddity here because the inline should probably be removed.
It's an extern function in intelfb.h and it is used in intelfbdrv.c and
intelfbhw.c.
The inline is kept here as I suppose it's possible for some compiler to
make the uses inline in intelfbdrv and and also create an external
function for intelfbhw.
Link: http://lkml.kernel.org/r/8ba151a1fdc84e42cbf4aafc798513c0158edee1.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Maik Broemme <mbroemme@libmpq.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
Also use inline instead of __inline__.
Link: http://lkml.kernel.org/r/a5072b74b6c293e6ec93c4900482e9d3267f15b2.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Johan Hovold <johan@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/55d3e89d50bb03d603bfb28019fab07f48bdc714.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Pat Gefre <pfg@sgi.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/3f980cd89084ae09716353aba3171e4b3815e690.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Cc: Ursula Braun <ubraun@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/1cd3d401626e51ea0e2333a860e76e80bc560a4c.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/f81bb2a67a97b1fd8b6ea99bd350d8a0f6864fb1.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/756d3fb543e981b9284e756fa27616725a354b28.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Make the code like the rest of the kernel.
Link: http://lkml.kernel.org/r/14db9c166d5b68efa77e337cfe49bb9b29bca3f7.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Make the use of inline like the rest of the kernel.
Link: http://lkml.kernel.org/r/f42b2202bd0d4e7ccf79ce5348bb255a035e67bb.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Make the use of inline like the rest of the kernel.
Link: http://lkml.kernel.org/r/d47074493af80ce12590340294bc49618165c30d.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Make the use of asmlinkage like the rest of the kernel.
Link: http://lkml.kernel.org/r/efb2dfed4d9315bf68ec0334c81b65af176a0174.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Move inline to be like the rest of the kernel.
Link: http://lkml.kernel.org/r/6bf1bec049897c4158f698b866810f47c728f233.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Convert 'u8 inline' to 'inline u8' to be the same style used by the rest
of the kernel.
Miscellanea:
jornada_ssp_reverse is an odd function.
It is declared inline but is also EXPORT_SYMBOL.
It is also apparently only used by jornada720_ssp.c
Likely the EXPORT_SYMBOL could be removed and the function
converted to static.
The addition of static and removal of EXPORT_SYMBOL was not done.
Link: http://lkml.kernel.org/r/5bd3b2bf39c6c9caf773949f18158f8f5ec08582.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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asmlinkage is either 'extern "C"' or blank.
Move the uses of asmlinkage before the return types to be similar
to the rest of the kernel.
Link: http://lkml.kernel.org/r/005b8e120650c6a13b541e420f4e3605603fe9e6.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krcmar <rkrcmar@redhat.com>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Make sure static, extern, and asmlinkage appear before a specific type.
e.g.:
int asmlinkage foo(void)
is better written
asmlinkage int foo(void)
Link: http://lkml.kernel.org/r/31704c96df2d5fd9df0b41165940a7a4feb16a63.1499284835.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Page migration (for memory hotplug, soft_offline_page or mbind) needs to
allocate a new memory. This can trigger an oom killer if the target
memory is depleated. Although quite unlikely, still possible,
especially for the memory hotplug (offlining of memoery).
Up to now we didn't really have reasonable means to back off.
__GFP_NORETRY can fail just too easily and __GFP_THISNODE sticks to a
single node and that is not suitable for all callers.
But now that we have __GFP_RETRY_MAYFAIL we should use it. It is
preferable to fail the migration than disrupt the system by killing some
processes.
Link: http://lkml.kernel.org/r/20170623085345.11304-7-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alex Belits <alex.belits@cavium.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: NeilBrown <neilb@suse.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Commit 24f8e00a8a2e ("drm/i915: Prefer to report ENOMEM rather than
incur the oom for gfx allocations") has tried to remove disruptive OOM
killer because the userspace should be able to cope with allocation
failures.
At the time only __GFP_NORETRY could achieve that and it turned out that
this would fail the allocations just too easily. So "drm/i915: Remove
__GFP_NORETRY from our buffer allocator" removed it and hoped for a
better solution. __GFP_RETRY_MAYFAIL is that solution. It will keep
retrying the allocation until there is no more progress and we would go
OOM. Instead we fail the allocation and let the caller to deal with it.
Link: http://lkml.kernel.org/r/20170623085345.11304-6-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Alex Belits <alex.belits@cavium.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: NeilBrown <neilb@suse.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Now that __GFP_RETRY_MAYFAIL has a reasonable semantic regardless of the
request size we can drop the hackish implementation for !costly orders.
__GFP_RETRY_MAYFAIL retries as long as the reclaim makes a forward
progress and backs of when we are out of memory for the requested size.
Therefore we do not need to enforce__GFP_NORETRY for !costly orders just
to silent the oom killer anymore.
Link: http://lkml.kernel.org/r/20170623085345.11304-5-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alex Belits <alex.belits@cavium.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: NeilBrown <neilb@suse.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
KM_MAYFAIL didn't have any suitable GFP_FOO counterpart until recently
so it relied on the default page allocator behavior for the given set of
flags. This means that small allocations actually never failed.
Now that we have __GFP_RETRY_MAYFAIL flag which works independently on
the allocation request size we can map KM_MAYFAIL to it. The allocator
will try as hard as it can to fulfill the request but fails eventually
if the progress cannot be made. It does so without triggering the OOM
killer which can be seen as an improvement because KM_MAYFAIL users
should be able to deal with allocation failures.
Link: http://lkml.kernel.org/r/20170623085345.11304-4-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Alex Belits <alex.belits@cavium.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Daney <david.daney@cavium.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: NeilBrown <neilb@suse.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
semantic
__GFP_REPEAT was designed to allow retry-but-eventually-fail semantic to
the page allocator. This has been true but only for allocations
requests larger than PAGE_ALLOC_COSTLY_ORDER. It has been always
ignored for smaller sizes. This is a bit unfortunate because there is
no way to express the same semantic for those requests and they are
considered too important to fail so they might end up looping in the
page allocator for ever, similarly to GFP_NOFAIL requests.
Now that the whole tree has been cleaned up and accidental or misled
usage of __GFP_REPEAT flag has been removed for !costly requests we can
give the original flag a better name and more importantly a more useful
semantic. Let's rename it to __GFP_RETRY_MAYFAIL which tells the user
that the allocator would try really hard but there is no promise of a
success. This will work independent of the order and overrides the
default allocator behavior. Page allocator users have several levels of
guarantee vs. cost options (take GFP_KERNEL as an example)
- GFP_KERNEL & ~__GFP_RECLAIM - optimistic allocation without _any_
attempt to free memory at all. The most light weight mode which even
doesn't kick the background reclaim. Should be used carefully because
it might deplete the memory and the next user might hit the more
aggressive reclaim
- GFP_KERNEL & ~__GFP_DIRECT_RECLAIM (or GFP_NOWAIT)- optimistic
allocation without any attempt to free memory from the current
context but can wake kswapd to reclaim memory if the zone is below
the low watermark. Can be used from either atomic contexts or when
the request is a performance optimization and there is another
fallback for a slow path.
- (GFP_KERNEL|__GFP_HIGH) & ~__GFP_DIRECT_RECLAIM (aka GFP_ATOMIC) -
non sleeping allocation with an expensive fallback so it can access
some portion of memory reserves. Usually used from interrupt/bh
context with an expensive slow path fallback.
- GFP_KERNEL - both background and direct reclaim are allowed and the
_default_ page allocator behavior is used. That means that !costly
allocation requests are basically nofail but there is no guarantee of
that behavior so failures have to be checked properly by callers
(e.g. OOM killer victim is allowed to fail currently).
- GFP_KERNEL | __GFP_NORETRY - overrides the default allocator behavior
and all allocation requests fail early rather than cause disruptive
reclaim (one round of reclaim in this implementation). The OOM killer
is not invoked.
- GFP_KERNEL | __GFP_RETRY_MAYFAIL - overrides the default allocator
behavior and all allocation requests try really hard. The request
will fail if the reclaim cannot make any progress. The OOM killer
won't be triggered.
- GFP_KERNEL | __GFP_NOFAIL - overrides the default allocator behavior
and all allocation requests will loop endlessly until they succeed.
This might be really dangerous especially for larger orders.
Existing users of __GFP_REPEAT are changed to __GFP_RETRY_MAYFAIL
because they already had their semantic. No new users are added.
__alloc_pages_slowpath is changed to bail out for __GFP_RETRY_MAYFAIL if
there is no progress and we have already passed the OOM point.
This means that all the reclaim opportunities have been exhausted except
the most disruptive one (the OOM killer) and a user defined fallback
behavior is more sensible than keep retrying in the page allocator.
[akpm@linux-foundation.org: fix arch/sparc/kernel/mdesc.c]
[mhocko@suse.com: semantic fix]
Link: http://lkml.kernel.org/r/20170626123847.GM11534@dhcp22.suse.cz
[mhocko@kernel.org: address other thing spotted by Vlastimil]
Link: http://lkml.kernel.org/r/20170626124233.GN11534@dhcp22.suse.cz
Link: http://lkml.kernel.org/r/20170623085345.11304-3-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alex Belits <alex.belits@cavium.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: NeilBrown <neilb@suse.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Patch series "mm: give __GFP_REPEAT a better semantic".
The main motivation for the change is that the current implementation of
__GFP_REPEAT is not very much useful.
The documentation says:
* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
* _might_ fail. This depends upon the particular VM implementation.
It just fails to mention that this is true only for large (costly) high
order which has been the case since the flag was introduced. A similar
semantic would be really helpful for smal orders as well, though,
because we have places where a failure with a specific fallback error
handling is preferred to a potential endless loop inside the page
allocator.
The earlier cleanup dropped __GFP_REPEAT usage for low (!costly) order
users so only those which might use larger orders have stayed. One new
user added in the meantime is addressed in patch 1.
Let's rename the flag to something more verbose and use it for existing
users. Semantic for those will not change. Then implement low
(!costly) orders failure path which is hit after the page allocator is
about to invoke the oom killer. With that we have a good counterpart
for __GFP_NORETRY and finally can tell try as hard as possible without
the OOM killer.
Xfs code already has an existing annotation for allocations which are
allowed to fail and we can trivially map them to the new gfp flag
because it will provide the semantic KM_MAYFAIL wants. Christoph didn't
consider the new flag really necessary but didn't respond to the OOM
killer aspect of the change so I have kept the patch. If this is still
seen as not really needed I can drop the patch.
kvmalloc will allow also !costly high order allocations to retry hard
before falling back to the vmalloc.
drm/i915 asked for the new semantic explicitly.
Memory migration code, especially for the memory hotplug, should back
off rather than invoking the OOM killer as well.
This patch (of 6):
Commit 3377e227af44 ("MIPS: Add 48-bit VA space (and 4-level page
tables) for 4K pages.") has added a new __GFP_REPEAT user but using this
flag doesn't really make any sense for order-0 request which is the case
here because PUD_ORDER is 0. __GFP_REPEAT has historically effect only
on allocation requests with order > PAGE_ALLOC_COSTLY_ORDER.
This doesn't introduce any functional change. This is a preparatory
patch for later work which renames the flag and redefines its semantic.
Link: http://lkml.kernel.org/r/20170623085345.11304-2-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alex Belits <alex.belits@cavium.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: NeilBrown <neilb@suse.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
When RLIMIT_STACK is, for example, 256MB, the current code results in a
gap between the top of the task and mmap_base of 256MB, failing to take
into account the amount by which the stack address was randomized. In
other words, the stack gets less than RLIMIT_STACK space.
Ensure that the gap between the stack and mmap_base always takes stack
randomization and the stack guard gap into account.
Inspired by Daniel Micay's linux-hardened tree.
Link: http://lkml.kernel.org/r/20170622200033.25714-4-riel@redhat.com
Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Florian Weimer <fweimer@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
When RLIMIT_STACK is, for example, 256MB, the current code results in a
gap between the top of the task and mmap_base of 256MB, failing to take
into account the amount by which the stack address was randomized. In
other words, the stack gets less than RLIMIT_STACK space.
Ensure that the gap between the stack and mmap_base always takes stack
randomization and the stack guard gap into account.
Obtained from Daniel Micay's linux-hardened tree.
Link: http://lkml.kernel.org/r/20170622200033.25714-3-riel@redhat.com
Signed-off-by: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Florian Weimer <fweimer@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
When RLIMIT_STACK is, for example, 256MB, the current code results in a
gap between the top of the task and mmap_base of 256MB, failing to take
into account the amount by which the stack address was randomized. In
other words, the stack gets less than RLIMIT_STACK space.
Ensure that the gap between the stack and mmap_base always takes stack
randomization and the stack guard gap into account.
Obtained from Daniel Micay's linux-hardened tree.
Link: http://lkml.kernel.org/r/20170622200033.25714-2-riel@redhat.com
Signed-off-by: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Florian Weimer <fweimer@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Use the ascii-armor canary to prevent unterminated C string overflows
from being able to successfully overwrite the canary, even if they
somehow obtain the canary value.
Inspired by execshield ascii-armor and Daniel Micay's linux-hardened
tree.
Link: http://lkml.kernel.org/r/20170524123446.78510066@annuminas.surriel.com
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Use the ascii-armor canary to prevent unterminated C string overflows
from being able to successfully overwrite the canary, even if they
somehow obtain the canary value.
Inspired by execshield ascii-armor and Daniel Micay's linux-hardened
tree.
Link: http://lkml.kernel.org/r/20170524155751.424-5-riel@redhat.com
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Use the ascii-armor canary to prevent unterminated C string overflows
from being able to successfully overwrite the canary, even if they
somehow obtain the canary value.
Inspired by execshield ascii-armor and Daniel Micay's linux-hardened
tree.
Link: http://lkml.kernel.org/r/20170524155751.424-4-riel@redhat.com
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
