Dmitry Vyukov e41d58185f fault-inject: support systematic fault injection ... Add /proc/self/task/<current-tid>/fail-nth file that allows failing 0-th, 1-st, 2-nd and so on calls systematically. Excerpt from the added documentation: "Write to this file of integer N makes N-th call in the current task fail (N is 0-based). Read from this file returns a single char 'Y' or 'N' that says if the fault setup with a previous write to this file was injected or not, and disables the fault if it wasn't yet injected. Note that this file enables all types of faults (slab, futex, etc). This setting takes precedence over all other generic settings like probability, interval, times, etc. But per-capability settings (e.g. fail_futex/ignore-private) take precedence over it. This feature is intended for systematic testing of faults in a single system call. See an example below" Why add a new setting: 1. Existing settings are global rather than per-task. So parallel testing is not possible. 2. attr->interval is close but it depends on attr->count which is non reset to 0, so interval does not work as expected. 3. Trying to model this with existing settings requires manipulations of all of probability, interval, times, space, task-filter and unexposed count and per-task make-it-fail files. 4. Existing settings are per-failure-type, and the set of failure types is potentially expanding. 5. make-it-fail can't be changed by unprivileged user and aggressive stress testing better be done from an unprivileged user. Similarly, this would require opening the debugfs files to the unprivileged user, as he would need to reopen at least times file (not possible to pre-open before dropping privs). The proposed interface solves all of the above (see the example). We want to integrate this into syzkaller fuzzer. A prototype has found 10 bugs in kernel in first day of usage: https://groups.google.com/forum/#!searchin/syzkaller/%22FAULT_INJECTION%22%7Csort:relevance I've made the current interface work with all types of our sandboxes. For setuid the secret sauce was prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) to make /proc entries non-root owned. So I am fine with the current version of the code. [akpm@linux-foundation.org: fix build] Link: http://lkml.kernel.org/r/20170328130128.101773-1-dvyukov@google.com Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-07-12 16:26:01 -07:00
..
ABI	for-f2fs-4.13	2017-07-10 14:29:45 -07:00
accounting
acpi	This is the bulk of GPIO changes for the v4.13 series:	2017-07-07 12:40:27 -07:00
admin-guide	Merge branch 'akpm' (patches from Andrew)	2017-07-06 22:27:08 -07:00
aoe
arm	ARM: at91: Documentation: add armv7m families	2017-06-02 10:11:09 +02:00
arm64	IOMMU Updates for Linux v4.13	2017-07-12 10:00:04 -07:00
auxdisplay
backlight
blackfin
block	bio-integrity: fold bio_integrity_enabled to bio_integrity_prep	2017-07-03 16:56:24 -06:00
blockdev	remove the mg_disk driver	2017-04-14 14:00:49 -06:00
bus-devices
cdrom	cdrom: Make device operations read-only	2017-02-14 08:29:56 -07:00
cgroup-v1	mm, vmpressure: pass-through notification support	2017-07-10 16:32:31 -07:00
cma
connector
console
core-api	There has been a fair amount of activity in the docs tree this time	2017-07-03 21:13:25 -07:00
cpu-freq	cpufreq: intel_pstate: Document the current behavior and user interface	2017-05-14 02:06:03 +02:00
cpuidle
cris
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2017-07-05 12:22:23 -07:00
dev-tools	linux-kselftest-4.13-rc1-update	2017-07-07 14:04:47 -07:00
device-mapper	dm zoned: drive-managed zoned block device target	2017-06-19 11:05:20 -04:00
devicetree	Merge branch 'i2c/for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2017-07-12 10:04:56 -07:00
dmaengine
doc-guide	kernel-doc: describe the `literal` syntax	2017-05-16 08:44:24 -03:00
driver-api	Merge branch 'i2c/for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2017-07-12 10:04:56 -07:00
driver-model	pci-v4.13-changes	2017-07-08 15:51:57 -07:00
early-userspace	Documentation: Fix dead URLs to ftp.kernel.org	2017-03-29 15:46:06 -06:00
EDID	drm: use .hword to represent 16-bit numbers	2017-03-30 10:15:19 +02:00
extcon	extcon: Remove porting compatibility of swich class	2017-04-06 10:55:24 +09:00
fault-injection	fault-inject: support systematic fault injection	2017-07-12 16:26:01 -07:00
fb	docs: update old references for DocBook from the documentation	2017-05-16 08:44:19 -03:00
features	powerpc updates for 4.12 part 1.	2017-05-05 11:36:44 -07:00
filesystems	procfs: fdinfo: extend information about epoll target files	2017-07-12 16:26:01 -07:00
firmware_class
fmc
fpga	fpga: Add scatterlist based programming	2017-02-10 15:20:44 +01:00
frv
gpio	gpio: return NULL from gpiod_get_optional when GPIOLIB is disabled	2017-03-15 11:16:30 +01:00
gpu	main drm pull for v4.13	2017-07-09 18:48:37 -07:00
hid	Documentation: hid: fix path to input bus definitions	2017-03-13 17:15:19 -06:00
hwmon	hwmon: (pmbus) move header file out of I2C realm	2017-06-11 17:08:19 -07:00
i2c	i2c: i801: Add support for Intel Cannon Lake	2017-06-19 16:17:41 +02:00
ia64
ide
iio
infiniband	IB/opa-vnic: Virtual Network Interface Controller (VNIC) documentation	2017-04-20 12:01:06 -04:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2017-05-26 16:45:13 -07:00
ioctl	scsi: cxlflash: Introduce host ioctl support	2017-06-26 15:01:11 -04:00
isdn
kbuild	Kbuild thin archives updates for v4.13	2017-07-07 15:11:12 -07:00
kdump	kexec/kdump: minor Documentation updates for arm64 and Image	2017-07-12 16:26:00 -07:00
kernel-hacking	There has been a fair amount of activity in the docs tree this time	2017-07-03 21:13:25 -07:00
laptops
leds	Documentaion: leds: leds-lp55xx.txt: Fix typos	2017-03-17 13:06:14 -06:00
lightnvm	lightnvm: physical block device (pblk) target	2017-04-16 10:06:33 -06:00
livepatch	livepatch: allow removal of a disabled patch	2017-03-08 09:38:43 +01:00
locking
m68k
md	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md	2017-05-03 10:05:38 -07:00
media	media updates for v4.13-rc1	2017-07-06 11:15:19 -07:00
memory-devices
metag
mic
mips
misc-devices	Documentation: misc-devices: Add Documentation for pci-endpoint-test driver	2017-04-28 10:23:19 -05:00
mmc	MMC core:	2017-05-02 17:34:32 -07:00
mn10300
mtd
namespaces
netlabel
networking	doc: SKB_GSO_[IPIP|SIT] have been replaced	2017-07-08 11:25:56 +01:00
nfc
nios2
nvdimm
nvmem
parisc
PCI	docs: update old references for DocBook from the documentation	2017-05-16 08:44:19 -03:00
pcmcia
perf	perf: qcom: Add L3 cache PMU driver	2017-04-03 18:53:50 +01:00
phy
platform
power	power supply and reset changes for the v4.13 series	2017-07-04 14:25:14 -07:00
powerpc	powerpc updates for 4.13	2017-07-07 13:55:45 -07:00
pps
process	Kbuild thin archives updates for v4.13	2017-07-07 15:11:12 -07:00
pti
ptp
rapidio
RCU	rcu: Remove debugfs tracing	2017-06-08 18:52:43 -07:00
s390	docs: add documentation for vfio-ccw	2017-03-31 12:55:11 +02:00
scheduler	sched/deadline: Add documentation about GRUB reclaiming	2017-06-08 10:31:56 +02:00
scsi	scsi: make asynchronous aborts mandatory	2017-04-06 13:07:33 -04:00
security	docs: Fix some formatting issues in request-key.rst	2017-05-18 10:46:25 -06:00
serial	tty: n_gsm: do not send/receive in ldisc close path	2017-06-03 18:48:52 +09:00
sh	docs-rst: convert sh book to ReST	2017-05-16 08:44:18 -03:00
sound	sound updates for 4.13-rc1	2017-07-06 10:56:51 -07:00
sparc	Documentation/sparc: Steps for sending break on sunhv console	2017-02-23 08:27:25 -08:00
sphinx	Docs: clean up some DocBook loose ends	2017-06-23 14:17:38 -06:00
sphinx-static
spi	spi: Document SPI slave controller support	2017-05-26 13:11:00 +01:00
sysctl	mm: document highmem_is_dirtyable sysctl	2017-07-10 16:32:32 -07:00
target	Documentation/target: add an example script to configure an iSCSI target	2017-05-01 22:21:35 -07:00
thermal	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2017-05-12 11:58:45 -07:00
timers	rcu: Eliminate NOCBs CPU-state Kconfig options	2017-06-08 18:52:43 -07:00
trace	Char/Misc patches for 4.13-rc1	2017-07-03 20:55:59 -07:00
translations	doc/kokr/howto: Only send regression fixes after -rc1	2017-06-22 10:25:22 -06:00
usb	usb: gadget: add f_uac1 variant based on a new u_audio api	2017-06-19 09:22:47 +03:00
userspace-api	doc: ReSTify no_new_privs.txt	2017-05-18 10:30:09 -06:00
virtual	kvm: x86: mmu: allow A/D bits to be disabled in an mmu	2017-07-03 11:19:54 +02:00
vm	ksm: introduce ksm_max_page_sharing per page deduplication limit	2017-07-06 16:24:31 -07:00
w1	w1: add documentation for w1_ds2438	2017-03-17 15:10:49 +09:00
watchdog	watchdog: uniphier: add UniPhier watchdog driver	2017-07-03 13:58:55 +02:00
wimax
x86	x86/mce: Update bootlog description to reflect behavior on AMD	2017-06-14 07:32:10 +02:00
xtensa	of: update ePAPR references to point to Devicetree Specification	2017-06-22 11:22:06 -05:00
.gitignore
00-INDEX	linux-kselftest-4.13-rc1-update	2017-07-07 14:04:47 -07:00
bcache.txt
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt	mm/oom_kill: count global and memory cgroup oom kills	2017-07-06 16:24:35 -07:00
Changes
circular-buffers.txt
clk.txt
CodingStyle
conf.py	Docs: Fix breakage with Sphinx 1.5 and upper	2017-06-23 13:45:37 -06:00
cpu-load.txt
cputopology.txt	docs: Fix a couple typos	2017-04-27 15:54:39 -06:00
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt	docs: Fix a couple typos	2017-04-27 15:54:39 -06:00
dell_rbu.txt
digsig.txt
DMA-API-HOWTO.txt	dma-mapping: remove DMA_ERROR_CODE	2017-06-28 06:54:37 -07:00
DMA-API.txt	Documentation: DMA API: fix a typo in a function name	2017-06-05 15:57:02 -06:00
DMA-attributes.txt
DMA-ISA-LPC.txt	Documentation: DMA-ISA-LPC.txt	2017-02-12 15:20:07 -07:00
docutils.conf
dontdiff	GCC plugin updates:	2017-07-05 11:46:59 -07:00
efi-stub.txt
eisa.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt	gcc-plugins: update architecture list in documentation	2017-03-21 22:20:05 +11:00
highuid.txt
hw_random.txt
hwspinlock.txt
index.rst	Make the main documentation title less Geocities	2017-06-23 14:02:27 -06:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt	Documentation: Update IRQ-domain.txt to document irq_domain_mapping	2017-05-22 22:29:45 +02:00
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
kernel-doc-nano-HOWTO.txt	docs: update old references for DocBook from the documentation	2017-05-16 08:44:19 -03:00
kernel-per-CPU-kthreads.txt	rcu: Eliminate NOCBs CPU-state Kconfig options	2017-06-08 18:52:43 -07:00
kobject.txt
kprobes.txt
kref.txt	Revert "kref: double kref_put() in my_data_handler()"	2017-04-08 18:38:10 +02:00
ldm.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lsm.txt	docs-rst: convert lsm from DocBook to ReST	2017-05-16 08:44:19 -03:00
lzo.txt
mailbox.txt
Makefile	docs: remove DocBook from the building system	2017-05-16 08:44:19 -03:00
memory-barriers.txt	There has been a fair amount of activity in the docs tree this time	2017-07-03 21:13:25 -07:00
memory-hotplug.txt	mm, memory_hotplug: support movable_node for hotpluggable nodes	2017-07-10 16:32:31 -07:00
men-chameleon-bus.txt
nommu-mmap.txt
ntb.txt
numastat.txt
padata.txt
parport-lowlevel.txt
percpu-rw-semaphore.txt
phy.txt	Documentation: phy: Fix repetition of word 'the'	2017-03-09 00:33:15 -07:00
pi-futex.txt
pnp.txt
preempt-locking.txt
printk-formats.txt	vsprintf: Add %p extension "%pOF" for device tree	2017-06-27 12:36:40 -05:00
pwm.txt
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
sgi-ioc4.txt
siphash.txt
SM501.txt
smsc_ece1099.txt
static-keys.txt	docs: Fix a couple typos	2017-04-27 15:54:39 -06:00
SubmittingPatches
svga.txt
switchtec.txt	switchtec: Add IOCTLs to the Switchtec driver	2017-04-12 12:23:37 -05:00
sync_file.txt	sync_file.txt: standardize document format	2017-05-24 13:01:27 -03:00
tee.txt	Documentation: tee subsystem and op-tee driver	2017-03-10 14:51:57 +01:00
this_cpu_ops.txt
unaligned-memory-access.txt
vfio-mediated-device.txt	docs: Fix a spelling error in vfio-mediated-device.txt	2017-04-27 15:54:39 -06:00
vfio.txt
video-output.txt
xillybus.txt
xz.txt
zorro.txt	docs: Fix a couple typos	2017-04-27 15:54:39 -06:00