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msm-4.14/lib
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Eric Biggers ce922b7b4a lib/mpi: call cond_resched() from mpi_powm() loop 
commit 1d9ddde12e3c9bab7f3d3484eb9446315e3571ca upstream.

On a non-preemptible kernel, if KEYCTL_DH_COMPUTE is called with the
largest permitted inputs (16384 bits), the kernel spends 10+ seconds
doing modular exponentiation in mpi_powm() without rescheduling.  If all
threads do it, it locks up the system.  Moreover, it can cause
rcu_sched-stall warnings.

Notwithstanding the insanity of doing this calculation in kernel mode
rather than in userspace, fix it by calling cond_resched() as each bit
from the exponent is processed.  It's still noninterruptible, but at
least it's preemptible now.

Do the cond_resched() once per bit rather than once per MPI limb because
each limb might still easily take 100+ milliseconds on slow CPUs.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-30 08:40:39 +00:00
..
842
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fonts
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lz4
lib/lz4: make arrays static const, reduces object code size
2017-10-03 17:54:25 -07:00
lzo
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mpi
lib/mpi: call cond_resched() from mpi_powm() loop
2017-11-30 08:40:39 +00:00
raid6
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reed_solomon
…
xz
…
zlib_deflate
…
zlib_inflate
lib/zlib_inflate/inftrees.c: fix potential buffer overflow
2017-05-08 17:15:12 -07:00
zstd
lib: Add zstd modules
2017-08-15 09:02:08 -07:00
.gitignore
…
argv_split.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
asn1_decoder.c
KEYS: fix NULL pointer dereference during ASN.1 parsing [ver #2]
2017-11-09 00:38:21 +11:00
assoc_array.c
assoc_array: Fix a buggy node-splitting case
2017-10-28 10:31:07 -07:00
atomic64_test.c
lib/atomic64_test.c: add a test that atomic64_inc_not_zero() returns an int
2017-07-14 15:05:13 -07:00
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
audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bcd.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bch.c
…
bitmap.c
lib/bitmap.c: make bitmap_parselist() thread-safe and much faster
2017-09-08 18:26:49 -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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
build_OID_registry
…
bust_spinlocks.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
chacha20.c
random: replace non-blocking pool with a Chacha20-based CRNG
2016-07-03 00:57:23 -04:00
check_signature.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmdline.c
lib/cmdline.c: remove meaningless comment
2017-09-08 18:26:49 -07:00
compat_audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cordic.c
…
cpu_rmap.c
…
cpumask.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crc32test.c
lib: add module support to crc32 tests
2017-02-24 17:46:57 -08:00
crc-ccitt.c
…
crc-itu-t.c
…
crc-t10dif.c
…
ctype.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug_info.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug_locks.c
…
debugobjects.c
debugobjects: Make kmemleak ignore debug objects
2017-08-14 16:51:01 +02:00
dec_and_lock.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
decompress_bunzip2.c
…
decompress_inflate.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
…
decompress.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
devres.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
digsig.c
lib/digsig: fix dereference of NULL user_key_payload
2017-10-12 17:16:40 +01:00
div64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dma-debug.c
dmaengine updates for 4.12-rc1
2017-05-09 15:40:28 -07:00
dma-noop.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dma-virt.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dump_stack.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dynamic_debug.c
dynamic_debug: add jump label support
2016-08-04 08:50:07 -04:00
dynamic_queue_limits.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
earlycpio.c
lib/cpio: Make find_cpio_data()'s offset arg optional
2016-06-08 11:04:19 +02:00
errseq.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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: fix wrong should_fail() decision in task context
2017-08-10 15:54:06 -07:00
fdt_empty_tree.c
…
fdt_ro.c
…
fdt_rw.c
…
fdt_strerror.c
…
fdt_sw.c
…
fdt_wip.c
…
fdt.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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gcd.c
lib/GCD.c: use binary GCD algorithm instead of Euclidean
2016-05-20 17:58:30 -07:00
gen_crc32table.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
lib/hexdump.c: return -EINVAL in case of error in hex2bin()
2017-09-08 18:26:49 -07:00
hweight.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
idr.c
lib/idr.c: fix comment for idr_replace()
2017-10-03 17:54:25 -07:00
inflate.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
int_sqrt.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
interval_tree_test.c
lib/interval_tree: fast overlap detection
2017-09-08 18:26:49 -07:00
interval_tree.c
…
iomap_copy.c
lib/iomap_copy.c: add __ioread32_copy()
2016-01-20 17:09:18 -08:00
iomap.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iommu-common.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iommu-helper.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ioremap.c
License cleanup: add SPDX license identifiers to some files
2017-11-02 10:04:46 -07:00
iov_iter.c
iov_iter: fix page_copy_sane for compound pages
2017-09-20 23:27:48 -04:00
irq_poll.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kconfig
Merge branch 'zstd-minimal' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
2017-09-14 17:30:49 -07:00
Kconfig.debug
Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-10-14 15:14:20 -04:00
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_uevent.c
driver core: suppress sending MODALIAS in UNBIND uevents
2017-09-18 16:48:33 +02:00
kobject.c
kobject: Export kobject_get_unless_zero()
2017-03-22 20:11:35 -06:00
kstrtox.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kstrtox.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
llist.c
…
locking-selftest-hardirq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-mutex.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-rlock-hardirq.h
…
locking-selftest-rlock-softirq.h
…
locking-selftest-rlock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-rsem.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-rtmutex.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-softirq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-spin-hardirq.h
…
locking-selftest-spin-softirq.h
…
locking-selftest-spin.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-wlock-hardirq.h
…
locking-selftest-wlock-softirq.h
…
locking-selftest-wlock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-wsem.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lockref.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lru_cache.c
…
Makefile
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
memory-notifier-error-inject.c
…
memweight.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
net_utils.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netdev-notifier-error-inject.c
…
nlattr.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nmi_backtrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nodemask.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
notifier-error-inject.c
…
notifier-error-inject.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
of-reconfig-notifier-error-inject.c
…
oid_registry.c
lib/oid_registry.c: X.509: fix the buffer overflow in the utility function for OID string
2017-09-08 18:26:49 -07:00
once.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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_counter.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
…
percpu-refcount.c
percpu-refcount: support synchronous switch to atomic mode.
2017-03-22 19:18:43 -07:00
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
radix-tree: must check __radix_tree_preload() return value
2017-09-08 18:26:49 -07:00
random32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ratelimit.c
lib/ratelimit.c: use deferred printk() version
2017-10-03 17:54:26 -07:00
rational.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rbtree_test.c
lib/rbtree_test.c: support rb_root_cached
2017-09-08 18:26:48 -07:00
rbtree.c
rbtree: add some additional comments for rebalancing cases
2017-09-08 18:26:48 -07:00
reciprocal_div.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
refcount.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rhashtable.c
rhashtable: Documentation tweak
2017-09-19 15:18:33 -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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sort.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stackdepot.c
lib/stackdepot: export save/fetch stack for drivers
2016-11-11 08:12:37 -08:00
stmp_device.c
…
string_helpers.c
mm: treewide: remove GFP_TEMPORARY allocation flag
2017-09-13 18:53:16 -07:00
string.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
strncpy_from_user.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
strnlen_user.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swiotlb.c
swiotlb: Add warnings for use of bounce buffers with SME
2017-07-18 11:38:03 +02:00
syscall.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
test_bitmap.c
lib/test_bitmap.c: use ULL suffix for 64-bit constants
2017-09-13 18:53:15 -07:00
test_bpf.c
bpf: add BPF_J{LT,LE,SLT,SLE} instructions
2017-08-09 16:53:56 -07:00
test_debug_virtual.c
lib: add test module for CONFIG_DEBUG_VIRTUAL
2017-09-08 18:26:49 -07:00
test_firmware.c
test_firmware: add batched firmware tests
2017-08-10 13:58:41 -07:00
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_kmod.c
test_kmod: flip INT checks to be consistent
2017-09-08 18:26:50 -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
lib: test_rhashtable: Fix KASAN warning
2017-07-25 12:35:23 -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: fix incorrect uuid_equal conversion in test_uuid_test
2017-07-21 09:38:30 +02:00
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
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
textsearch: fix typos in library helpers
2017-10-22 03:14:07 +01:00
ts_kmp.c
textsearch: fix typos in library helpers
2017-10-22 03:14:07 +01:00
ubsan.c
UBSAN: fix typo in format string
2016-08-02 17:31:41 -04:00
ubsan.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ucs2_string.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
usercopy.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
xxhash.c
lib: Add xxhash module
2017-08-15 09:02:07 -07:00