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
..
842	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2016-03-17 21:38:27 -07:00
fonts	lib/fonts/Kconfig: keep non-Sparc fonts listed together	2017-02-27 18:43:46 -08:00
lz4	lib/lz4: remove back-compat wrappers	2017-02-24 17:46:57 -08:00
lzo
mpi	mpi: Fix NULL ptr dereference in mpi_powm() [ver #3]	2016-11-25 12:57:50 +11:00
raid6	lib/raid6: Add log-of-2 table for RAID6 HW requiring disk position	2017-05-16 10:01:57 +05:30
reed_solomon
xz
zlib_deflate
zlib_inflate	lib/zlib_inflate/inftrees.c: fix potential buffer overflow	2017-05-08 17:15:12 -07:00
.gitignore
argv_split.c
asn1_decoder.c	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2016-05-17 09:33:39 -07:00
assoc_array.c	assoc_array: don't call compare_object() on a node	2016-04-06 14:06:48 +01:00
atomic64.c	locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()	2016-06-16 10:48:32 +02:00
atomic64_test.c	lib: add module support to atomic64 tests	2017-02-24 17:46:57 -08:00
audit.c
bcd.c
bch.c
bitmap.c	bitmap: optimise bitmap_set and bitmap_clear of a single bit	2017-07-10 16:32:34 -07:00
bitrev.c
bsearch.c	lib/bsearch.c: micro-optimize pivot position calculation	2017-07-10 16:32:35 -07:00
btree.c
bug.c	debug: Add _ONCE() logic to report_bug()	2017-03-30 09:37:20 +02:00
build_OID_registry
bust_spinlocks.c
chacha20.c	random: replace non-blocking pool with a Chacha20-based CRNG	2016-07-03 00:57:23 -04:00
check_signature.c
checksum.c	ipv4: Update parameters for csum_tcpudp_magic to their original types	2016-03-13 23:55:13 -04:00
clz_ctz.c
clz_tab.c
cmdline.c	lib/cmdline.c: fix get_options() overflow while parsing ranges	2017-06-23 16:15:55 -07:00
compat_audit.c
cordic.c
cpu_rmap.c
cpumask.c	sched/fair, cpumask: Export for_each_cpu_wrap()	2017-05-15 10:15:23 +02:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
crc4.c	lib: Add crc4 module	2017-06-09 11:52:07 +02:00
crc7.c
crc8.c
crc16.c
crc32.c	lib: add module support to crc32 tests	2017-02-24 17:46:57 -08:00
crc32defs.h
crc32test.c	lib: add module support to crc32 tests	2017-02-24 17:46:57 -08:00
ctype.c
debug_info.c
debug_locks.c
debugobjects.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
dec_and_lock.c
decompress.c
decompress_bunzip2.c
decompress_inflate.c
decompress_unlz4.c	lib/decompress_unlz4: change module to work with new LZ4 module version	2017-02-24 17:46:57 -08:00
decompress_unlzma.c
decompress_unlzo.c
decompress_unxz.c
devres.c	devres: fix devm_ioremap_*() offset parameter kerneldoc description	2017-04-24 13:53:13 -05:00
digsig.c	KEYS: Differentiate uses of rcu_dereference_key() and user_key_payload()	2017-03-02 10:09:00 +11:00
div64.c
dma-debug.c	dmaengine updates for 4.12-rc1	2017-05-09 15:40:28 -07:00
dma-noop.c	dma: Take into account dma_pfn_offset	2017-06-28 06:55:01 -07:00
dma-virt.c	dma-virt: remove dma_supported and mapping_error methods	2017-06-28 06:54:41 -07:00
dump_stack.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>	2017-03-02 08:42:34 +01:00
dynamic_debug.c	dynamic_debug: add jump label support	2016-08-04 08:50:07 -04:00
dynamic_queue_limits.c
earlycpio.c	lib/cpio: Make find_cpio_data()'s offset arg optional	2016-06-08 11:04:19 +02:00
errseq.c	lib: add errseq_t type and infrastructure for handling it	2017-07-06 07:02:24 -04:00
extable.c	lib/extable.c: use bsearch() library function in search_extable()	2017-07-10 16:32:35 -07:00
fault-inject.c	fault-inject: support systematic fault injection	2017-07-12 16:26:01 -07:00
fdt.c
fdt_empty_tree.c
fdt_ro.c
fdt_rw.c
fdt_strerror.c
fdt_sw.c
fdt_wip.c
find_bit.c	lib/find_bit.c: micro-optimise find_next_*_bit	2017-02-24 17:46:57 -08:00
flex_array.c
flex_proportions.c	percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch	2017-06-20 15:42:32 -04:00
gcd.c	lib/GCD.c: use binary GCD algorithm instead of Euclidean	2016-05-20 17:58:30 -07:00
gen_crc32table.c
genalloc.c	lib/genalloc.c: start search from start of chunk	2016-10-27 18:43:43 -07:00
glob.c	lib: add module support to glob tests	2017-02-24 17:46:57 -08:00
globtest.c	lib: add module support to glob tests	2017-02-24 17:46:57 -08:00
hexdump.c
hweight.c	x86/hweight: Get rid of the special calling convention	2016-06-08 15:01:02 +02:00
idr.c	idr: Add missing __rcu annotations	2017-02-13 21:44:10 -05:00
inflate.c
int_sqrt.c
interval_tree.c
interval_tree_test.c	lib/interval_tree_test.c: allow full tree search	2017-07-10 16:32:35 -07:00
iomap.c
iomap_copy.c	lib/iomap_copy.c: add __ioread32_copy()	2016-01-20 17:09:18 -08:00
iommu-common.c
iommu-helper.c	lib/iommu-helper: skip to next segment	2016-08-02 19:35:07 -04:00
ioremap.c	mm: convert generic code to 5-level paging	2017-03-09 11:48:47 -08:00
iov_iter.c	Merge branch 'uaccess-work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-07 20:39:20 -07:00
irq_poll.c	This adds a new gcc plugin named "latent_entropy". It is designed to	2016-10-15 10:03:15 -07:00
irq_regs.c
is_single_threaded.c	sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
jedec_ddr_data.c
kasprintf.c	lib/kasprintf.c: add sanity check to kvasprintf	2016-01-16 11:17:27 -08:00
Kconfig	libnvdimm for 4.13	2017-07-07 09:44:06 -07:00
Kconfig.debug	test_sysctl: add dedicated proc sysctl test driver	2017-07-12 16:26:00 -07:00
Kconfig.kasan	mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB	2016-07-28 16:07:41 -07:00
Kconfig.kgdb	lib: update location of kgdb documentation	2017-05-16 08:44:22 -03:00
Kconfig.kmemcheck
Kconfig.ubsan	Kconfig: lib/Kconfig.ubsan fix reference to ubsan documentation	2016-12-14 16:04:08 -08:00
kfifo.c
klist.c	klist: fix starting point removed bug in klist iterators	2016-02-07 22:18:47 -08:00
kobject.c	kobject: Export kobject_get_unless_zero()	2017-03-22 20:11:35 -06:00
kobject_uevent.c	kobject: support passing in variables for synthetic uevents	2017-05-25 18:30:51 +02:00
kstrtox.c	lib/kstrtox.c: use "unsigned int" more	2017-07-10 16:32:34 -07:00
kstrtox.h
lcm.c
libcrc32c.c	crypto: Work around deallocated stack frame reference gcc bug on sparc.	2017-06-08 17:36:03 +08:00
list_debug.c	bug: switch data corruption check to __must_check	2017-02-24 17:46:56 -08:00
list_sort.c	lib: add module support to linked list sorting tests	2017-05-08 17:15:10 -07:00
llist.c
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-rtmutex.h	locking/selftest: Add RT-mutex support	2017-06-08 10:35:50 +02:00
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c	locking/selftest: Add RT-mutex support	2017-06-08 10:35:50 +02:00
lockref.c	locking/core: Remove cpu_relax_lowlatency() users	2016-11-16 10:15:10 +01:00
lru_cache.c
Makefile	test_sysctl: add dedicated proc sysctl test driver	2017-07-12 16:26:00 -07:00
memory-notifier-error-inject.c
memweight.c
net_utils.c
netdev-notifier-error-inject.c
nlattr.c	net: manual clean code which call skb_put_[data:zero]	2017-06-20 13:30:15 -04:00
nmi_backtrace.c	printk: Use the main logbuf in NMI when logbuf_lock is available	2017-05-19 14:42:19 +02:00
nodemask.c	include/linux/nodemask.h: create next_node_in() helper	2016-05-19 19:12:14 -07:00
notifier-error-inject.c
notifier-error-inject.h
of-reconfig-notifier-error-inject.c
oid_registry.c
once.c
parman.c	lib: Introduce priority array area manager	2017-02-03 16:35:42 -05:00
parser.c	parser: add u64 number parser	2016-12-06 10:17:03 +02:00
pci_iomap.c
percpu-refcount.c	percpu-refcount: support synchronous switch to atomic mode.	2017-03-22 19:18:43 -07:00
percpu_counter.c	percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch	2017-06-20 15:42:32 -04:00
percpu_ida.c	sched/headers: Prepare to remove the <linux/gfp.h> include from <linux/sched.h>	2017-03-02 08:42:34 +01:00
percpu_test.c
plist.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>	2017-03-02 08:42:27 +01:00
pm-notifier-error-inject.c
prime_numbers.c	lib/prime_numbers: Suppress warn on kmalloc failure	2017-01-23 09:17:12 +01:00
radix-tree.c	lockdep: allow to disable reclaim lockup detection	2017-05-03 15:52:09 -07:00
random32.c	This adds a new gcc plugin named "latent_entropy". It is designed to	2016-10-15 10:03:15 -07:00
ratelimit.c	ratelimit: extend to print suppressed messages on release	2016-08-02 19:35:06 -04:00
rational.c
rbtree.c	rbtree: use designated initializers	2017-02-24 17:46:57 -08:00
rbtree_test.c
reciprocal_div.c
refcount.c	locking/refcount: Create unchecked atomic_t implementation	2017-06-28 18:54:46 +02:00
rhashtable.c	lib/rhashtable.c: use kvzalloc() in bucket_table_alloc() when possible	2017-07-10 16:32:35 -07:00
sbitmap.c	sbitmap: add sbitmap_get_shallow() operation	2017-04-14 14:06:52 -06:00
scatterlist.c	scatterlist: add sg_zero_buffer() helper	2017-06-15 14:30:14 +02:00
seq_buf.c
sg_pool.c	lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c	2016-04-15 16:53:14 -04:00
sg_split.c
sha1.c
show_mem.c	lib/show_mem.c: teach show_mem to work with the given nodemask	2017-02-22 16:41:30 -08:00
siphash.c	siphash: implement HalfSipHash1-3 for hash tables	2017-01-09 13:58:57 -05:00
smp_processor_id.c	sched/core: Enable might_sleep() and smp_processor_id() checks early	2017-05-23 10:01:38 +02:00
sort.c	lib: add CONFIG_TEST_SORT to enable self-test of sort()	2017-02-24 17:46:57 -08:00
stackdepot.c	lib/stackdepot: export save/fetch stack for drivers	2016-11-11 08:12:37 -08:00
stmp_device.c
string.c	USB patches for 4.12-rc1	2017-05-04 18:03:51 -07:00
string_helpers.c	string_helpers: add kstrdup_quotable_file	2016-04-21 10:47:26 +10:00
strncpy_from_user.c	lib: harden strncpy_from_user	2016-10-11 15:06:30 -07:00
strnlen_user.c	kill strlen_user()	2017-05-15 23:40:22 -04:00
swiotlb.c	swiotlb: ensure that page-sized mappings are page-aligned	2017-01-15 12:37:24 -05:00
syscall.c	lib/syscall: Clear return values when no stack	2017-03-24 07:43:35 +01:00
test-kstrtox.c
test-string_helpers.c	lib/test-string_helpers.c: fix and improve string_get_size() tests	2016-02-03 08:28:43 -08:00
test_bitmap.c	bitmap: optimise bitmap_set and bitmap_clear of a single bit	2017-07-10 16:32:34 -07:00
test_bpf.c	net: introduce __skb_put_[zero, data, u8]	2017-06-20 13:30:14 -04:00
test_firmware.c	test_firmware: add test custom fallback trigger	2017-01-25 11:52:34 +01:00
test_hash.c	lib/test_hash.c: fix warning in preprocessor symbol evaluation	2016-09-01 17:52:01 -07:00
test_hexdump.c	test_hexdump: print statistics at the end	2016-01-20 17:09:18 -08:00
test_kasan.c	kasan: report only the first error by default	2017-03-31 17:13:30 -07:00
test_list_sort.c	lib: add module support to linked list sorting tests	2017-05-08 17:15:10 -07:00
test_module.c
test_parman.c	lib: fix spelling mistake: "actualy" -> "actually"	2017-02-26 11:03:38 -05:00
test_printf.c	mm, printk: introduce new format string for flags	2016-03-15 16:55:16 -07:00
test_rhashtable.c	rhashtable-test: Fix max_size parameter description	2016-08-08 12:52:42 -07:00
test_siphash.c	siphash: implement HalfSipHash1-3 for hash tables	2017-01-09 13:58:57 -05:00
test_sort.c	Revert "lib/test_sort.c: make it explicitly non-modular"	2017-05-08 17:15:10 -07:00
test_static_key_base.c
test_static_keys.c	locking/static_keys: Avoid nested functions	2016-02-09 10:27:29 +01:00
test_sysctl.c	test_sysctl: test against int proc_dointvec() array support	2017-07-12 16:26:00 -07:00
test_user_copy.c	lib: remove check for AVR32 arch in test_user_copy	2017-05-01 09:36:30 +02:00
test_uuid.c	uuid: hoist helpers uuid_equal() and uuid_copy() from xfs	2017-06-05 16:59:04 +02:00
textsearch.c
timerqueue.c	timerqueue: Use rb_entry_safe() instead of open-coding it	2017-01-20 08:03:42 +01:00
ts_bm.c
ts_fsm.c
ts_kmp.c
ubsan.c	UBSAN: fix typo in format string	2016-08-02 17:31:41 -04:00
ubsan.h	UBSAN: run-time undefined behavior sanity checker	2016-01-20 17:09:18 -08:00
ucs2_string.c	lib/ucs2_string: Speed up ucs2_utf8size()	2016-09-09 16:08:46 +01:00
usercopy.c	copy_{from,to}_user(): move kasan checks and might_fault() out-of-line	2017-06-29 22:21:20 -04:00
uuid.c	uuid: hoist uuid_is_null() helper from libnvdimm	2017-06-05 16:59:05 +02:00
vsprintf.c	DeviceTree for 4.13:	2017-07-07 10:37:54 -07:00
win_minmax.c	lib/win_minmax: windowed min or max estimator	2016-09-21 00:22:59 -04:00