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Eric Biggers ce922b7b4a lib/mpi: call cond_resched() from mpi_powm() loop 
commit 1d9ddde12e 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
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xz
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zlib_deflate
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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
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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
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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
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bitmap.c
lib/bitmap.c: make bitmap_parselist() thread-safe and much faster
2017-09-08 18:26:49 -07:00
bitrev.c
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bsearch.c
lib/bsearch.c: micro-optimize pivot position calculation
2017-07-10 16:32:35 -07:00
btree.c
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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
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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
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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
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clz_ctz.c
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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
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cpu_rmap.c
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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
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crc8.c
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crc16.c
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crc32.c
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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
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crc-ccitt.c
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crc-itu-t.c
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crc-t10dif.c
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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
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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
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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
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decompress_unlzma.c
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decompress_unlzo.c
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decompress_unxz.c
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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
Merge tag 'dmaengine-4.12-rc1' of git://git.infradead.org/users/vkoul/slave-dma
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
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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
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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
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fdt_ro.c
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fdt_rw.c
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fdt_strerror.c
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fdt_sw.c
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fdt_wip.c
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fdt.c
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find_bit.c
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flex_array.c
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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
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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
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glob.c
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globtest.c
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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
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iomap_copy.c
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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
Merge tag 'spdx_identifiers-4.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
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
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is_single_threaded.c
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jedec_ddr_data.c
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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
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Kconfig.kgdb
lib: update location of kgdb documentation
2017-05-16 08:44:22 -03:00
Kconfig.kmemcheck
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Kconfig.ubsan
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kfifo.c
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klist.c
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kobject_uevent.c
driver core: suppress sending MODALIAS in UNBIND uevents
2017-09-18 16:48:33 +02:00
kobject.c
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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
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libcrc32c.c
crypto: Work around deallocated stack frame reference gcc bug on sparc.
2017-06-08 17:36:03 +08:00
list_debug.c
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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
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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
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locking-selftest-rlock-softirq.h
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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
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locking-selftest-spin-softirq.h
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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
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locking-selftest-wlock-softirq.h
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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
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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
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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
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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
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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
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parser.c
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pci_iomap.c
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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
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percpu_test.c
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percpu-refcount.c
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plist.c
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pm-notifier-error-inject.c
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prime_numbers.c
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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
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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
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sg_split.c
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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
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siphash.c
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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
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stmp_device.c
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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
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test_hexdump.c
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test_kasan.c
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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
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test_parman.c
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test_printf.c
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test_rhashtable.c
lib: test_rhashtable: Fix KASAN warning
2017-07-25 12:35:23 -07:00
test_siphash.c
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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
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test_static_keys.c
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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
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test-string_helpers.c
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textsearch.c
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timerqueue.c
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ts_bm.c
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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
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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
Merge tag 'devicetree-for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
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