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Mark Rutland 7af6188c36 BACKPORT: lib: harden strncpy_from_user 
The strncpy_from_user() accessor is effectively a copy_from_user()
specialised to copy strings, terminating early at a NUL byte if possible.
In other respects it is identical, and can be used to copy an arbitrarily
large buffer from userspace into the kernel.  Conceptually, it exposes a
similar attack surface.

As with copy_from_user(), we check the destination range when the kernel
is built with KASAN, but unlike copy_from_user() we do not check the
destination buffer when using HARDENED_USERCOPY.  As strncpy_from_user()
calls get_user() in a loop, we must call check_object_size() explicitly.

This patch adds this instrumentation to strncpy_from_user(), per the same
rationale as with the regular copy_from_user().  In the absence of
hardened usercopy this will have no impact as the instrumentation expands
to an empty static inline function.

Link: http://lkml.kernel.org/r/1472221903-31181-1-git-send-email-mark.rutland@arm.com
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Bug: 31374226
Change-Id: I898e4e9f19307e37a9be497cb1a0d7f1e3911661
(cherry picked from commit bf90e56e46)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
2016-10-18 11:08:46 -07:00
..
842
crypto: 842 - Add CRC and validation support
2015-10-14 22:23:17 +08:00
fonts
fonts: Add 6x10 font
2014-10-09 11:35:48 +03:00
lz4
lz4: fix system halt at boot kernel on x86_64
2015-05-24 11:56:29 -07:00
lzo
lzo: check for length overrun in variable length encoding.
2014-09-28 11:08:01 +02:00
mpi
Merge tag 'asm-generic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
2015-11-06 14:22:15 -08:00
raid6
md/raid6: delta syndrome for ARM NEON
2015-08-31 19:29:05 +02:00
reed_solomon
lib: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:17:17 -04:00
xz
lib/xz: enable all filters by default in Kconfig
2014-06-04 16:54:18 -07:00
zlib_deflate
zlib_deflate/deftree: remove bi_reverse()
2015-09-10 13:29:01 -07:00
zlib_inflate
zlib: clean up some dead code
2014-08-06 18:01:24 -07:00
.gitignore
X.509: Implement simple static OID registry
2012-10-08 13:50:18 +10:30
argv_split.c
argv_split(): teach it to handle mutable strings
2013-04-29 18:28:19 -07:00
asn1_decoder.c
UPSTREAM: KEYS: Fix ASN.1 indefinite length object parsing
2016-07-12 17:19:40 -07:00
assoc_array.c
UPSTREAM: assoc_array: don't call compare_object() on a node
2016-09-01 12:57:32 -07:00
atomic64_test.c
atomic: Add simple atomic_t tests
2015-07-27 14:06:24 +02:00
atomic64.c
atomic: Provide atomic_{or,xor,and}
2015-07-27 14:06:24 +02:00
audit.c
syscalls: implement execveat() system call
2014-12-13 12:42:51 -08:00
bcd.c
usb/core: use bin2bcd() for bcdDevice in RH
2012-09-10 11:13:16 -07:00
bch.c
lib: add shared BCH ECC library
2011-03-11 14:25:50 +00:00
bitmap.c
lib/bitmap.c: bitmap_parselist can accept string with whitespaces on head or tail
2015-09-10 13:29:01 -07:00
bitrev.c
ARM: 8187/1: add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction
2014-12-22 16:43:06 +00:00
bsearch.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
btree.c
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
bug.c
module: Sanitize RCU usage and locking
2015-05-28 11:31:52 +09:30
build_OID_registry
X.509: do not emit any informational output
2013-06-19 17:54:06 +02:00
bust_spinlocks.c
printk: Provide a wake_up_klogd() off-case
2013-03-22 16:41:20 -07:00
check_signature.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
checksum.c
lib/checksum.c: fix build for generic csum_tcpudp_nofold
2015-01-29 11:57:38 -08:00
clz_ctz.c
lib/clz_ctz.c: add prototype declarations in lib/clz_ctz.c
2014-04-03 16:21:12 -07:00
clz_tab.c
lib: Fix multiple definitions of clz_tab
2012-02-02 10:34:23 +11:00
cmdline.c
lib: Add a generic cmdline parse function parse_option_str
2014-10-03 18:40:58 +01:00
compat_audit.c
audit: Add generic compat syscall support
2014-03-20 10:11:35 -04:00
cordic.c
Docs: wording: functions -> algorithm
2011-10-29 21:20:22 +02:00
cpu_rmap.c
sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask()
2015-05-27 15:22:15 +02:00
cpu-notifier-error-inject.c
cpu: rewrite cpu-notifier-error-inject module
2012-07-30 17:25:22 -07:00
cpumask.c
revert "cpumask: don't perform while loop in cpumask_next_and()"
2015-06-18 17:00:23 -10:00
crc7.c
lib/crc7: Shift crc7() output left 1 bit
2014-05-16 14:26:52 -04:00
crc8.c
lib: crc8: add new library module providing crc8 algorithm
2011-06-03 15:01:06 -04:00
crc16.c
[PATCH] kernel-doc for lib/crc*.c
2006-06-25 10:01:20 -07:00
crc32.c
lib: crc32: Add some additional __pure annotations
2014-06-25 16:04:00 -07:00
crc32defs.h
crc32: select an algorithm via Kconfig
2012-03-23 16:58:38 -07:00
crc-ccitt.c
[PATCH] kernel-doc for lib/crc*.c
2006-06-25 10:01:20 -07:00
crc-itu-t.c
lib: crc-itu-t.[ch] fix 0x0x prefix in integer constants
2015-05-26 15:26:43 +02:00
crc-t10dif.c
lib: introduce crc_t10dif_update()
2015-05-30 22:42:24 -07:00
ctype.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
debug_info.c
kbuild: include core debug info when DEBUG_INFO_REDUCED
2015-06-11 15:08:32 +02:00
debug_locks.c
mutex: Add support for wound/wait style locks
2013-06-26 12:10:56 +02:00
debugobjects.c
lib/debugobjects.c: convert printk(KERN_DEBUG to pr_debug
2014-06-04 16:53:53 -07:00
dec_and_lock.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
decompress_bunzip2.c
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
decompress_inflate.c
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
decompress_unlz4.c
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
decompress_unlzma.c
lib/decompress_unlzma: Do a NULL check for pointer
2015-09-10 13:29:01 -07:00
decompress_unlzo.c
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
decompress_unxz.c
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
decompress.c
lib/decompress: set the compressor name to NULL on error
2015-07-17 16:39:54 -07:00
devres.c
devres: fix a for loop bounds check
2015-10-05 04:49:54 +01:00
digsig.c
KEYS: Merge the type-specific data with the payload data
2015-10-21 15:18:36 +01:00
div64.c
remove abs64()
2015-11-09 15:11:24 -08:00
dma-debug.c
dma-debug: Fix dma_debug_entry offset calculation
2015-12-16 11:24:26 -08:00
dump_stack.c
asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*
2014-05-05 16:07:46 -07:00
dynamic_debug.c
lib/dynamic_debug.c: use kstrdup_const
2015-11-06 17:50:42 -08:00
dynamic_queue_limits.c
lib/dynamic_queue_limits.c: simplify includes
2015-02-12 18:54:15 -08:00
earlycpio.c
earlycpio.c: Fix the confusing comment of find_cpio_data().
2013-08-14 23:24:01 +02:00
extable.c
UPSTREAM: extable: add support for relative extables to search and sort routines
2016-09-22 13:38:22 -07:00
fault-inject.c
fault-inject: fix inverted interval/probability values in printk
2015-10-23 17:55:10 +09:00
fdt_empty_tree.c
lib: add fdt_empty_tree.c
2014-04-30 19:49:37 +01:00
fdt_ro.c
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
fdt_rw.c
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
fdt_strerror.c
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
fdt_sw.c
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
fdt_wip.c
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
fdt.c
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
find_bit.c
lib: rename lib/find_next_bit.c to lib/find_bit.c
2015-04-17 09:03:54 -04:00
flex_array.c
reciprocal_divide: update/correction of the algorithm
2014-01-21 23:17:20 -08:00
flex_proportions.c
proportions: add @gfp to init functions
2014-09-08 09:51:30 +09:00
gcd.c
lib/gcd.c: prevent possible div by 0
2012-10-06 03:04:57 +09:00
gen_crc32table.c
lib: crc32: constify crc32 lookup table
2015-02-13 21:21:35 -08:00
genalloc.c
genalloc: add support of multiple gen_pools per device
2015-09-04 16:54:41 -07:00
glob.c
lib/glob.c: add CONFIG_GLOB_SELFTEST
2014-08-06 18:01:25 -07:00
halfmd4.c
lib/halfmd4.c: use rol32 inline function in the ROUND macro
2015-11-06 17:50:42 -08:00
hexdump.c
lib/hexdump.c: truncate output in case of overflow
2015-11-06 17:50:42 -08:00
hweight.c
Make ARCH_HAS_FAST_MULTIPLIER a real config variable
2014-09-13 11:14:53 -07:00
idr.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
inflate.c
MN10300: Don't try and #include <linux/slab.h> in lib/inflate.c from bootloader
2010-08-12 09:51:35 -07:00
int_sqrt.c
lib/int_sqrt.c: optimize square root algorithm
2013-04-29 18:28:19 -07:00
interval_tree_test.c
lib: Export interval_tree
2014-05-05 09:09:14 +02:00
interval_tree.c
lib/interval_tree.c: simplify includes
2015-02-12 18:54:15 -08:00
iomap_copy.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
iomap.c
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
iommu-common.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
2015-11-05 16:34:48 -08:00
iommu-helper.c
Merge tag 'module-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2012-03-24 10:24:31 -07:00
ioremap.c
x86, mm: support huge KVA mappings on x86
2015-04-14 16:49:04 -07:00
iov_iter.c
Merge branch 'iov_iter' into for-next
2015-04-11 22:26:51 -04:00
irq_regs.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
is_single_threaded.c
lib/is_single_threaded.c: change current_is_single_threaded() to use for_each_thread()
2015-11-06 17:50:42 -08:00
jedec_ddr_data.c
ddr: add LPDDR2 data from JESD209-2
2012-05-02 00:04:06 -07:00
kasprintf.c
lib/kasprintf.c: introduce kvasprintf_const
2015-11-06 17:50:42 -08:00
Kconfig
lib/Kconfig: ZLIB_DEFLATE must select BITREVERSE
2015-10-16 11:42:28 -07:00
Kconfig.debug
Merge remote-tracking branch 'linaro-ext/EAS/v4.4-easv5.2+aosp-changes' into android-4.4
2016-09-08 17:07:42 -07:00
Kconfig.kasan
mm, slub, kasan: enable user tracking by default with KASAN=y
2015-11-05 19:34:48 -08:00
Kconfig.kgdb
kdb: Allow access to sensitive commands to be restricted by default
2014-11-11 09:31:52 -06:00
Kconfig.kmemcheck
kmemcheck: depend on HAVE_ARCH_KMEMCHECK
2009-07-01 22:28:44 +02:00
kfifo.c
kfifo: use BUG_ON
2014-08-08 15:57:25 -07:00
klist.c
klist: implement klist_prev()
2015-07-28 08:50:42 +01:00
kobject_uevent.c
lib/kobject_uevent.c: remove redundant include
2015-02-12 18:54:15 -08:00
kobject.c
lib/kobject.c: use kvasprintf_const for formatting ->name
2015-11-06 17:50:42 -08:00
kstrtox.c
kstrto*: accept "-0" for signed conversion
2015-09-10 13:29:01 -07:00
kstrtox.h
lib/kstrtox: common code between kstrto*() and simple_strto*() functions
2011-10-31 17:30:56 -07:00
lcm.c
block: fix blk_stack_limits() regression due to lcm() change
2015-03-31 09:45:50 -06:00
libcrc32c.c
crypto: LLVMLinux: Remove VLAIS usage from libcrc32c.c
2014-10-14 10:51:23 +02:00
list_debug.c
rcu: Fix broken strings in RCU's source code.
2012-07-06 06:01:49 -07:00
list_sort.c
lib/list_sort: use late_initcall to hook in self tests
2015-06-16 14:12:35 -04:00
llist.c
lib/llist.c: fix data race in llist_del_first
2015-11-06 17:50:42 -08:00
locking-selftest-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-mutex.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rlock-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rlock-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rlock.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-rsem.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-spin-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-spin-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-spin.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wlock-hardirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wlock-softirq.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wlock.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest-wsem.h
[PATCH] lockdep: locking API self tests
2006-07-03 15:27:03 -07:00
locking-selftest.c
locking/lockdep: Revert qrwlock recusive stuff
2014-10-03 06:09:30 +02:00
lockref.c
locking/lockref: Remove homebrew cmpxchg64_relaxed() macro definition
2015-08-12 11:59:04 +02:00
lru_cache.c
lru_cache: remove use of seq_printf return value
2015-04-15 16:35:25 -07:00
Makefile
test_printf: test printf family at runtime
2015-11-06 17:50:42 -08:00
md5.c
lib/md5.c: simplify include
2015-02-12 18:54:15 -08:00
memory-notifier-error-inject.c
memory: memory notifier error injection module
2012-07-30 17:25:22 -07:00
memweight.c
string: introduce memweight()
2012-07-30 17:25:16 -07:00
net_utils.c
mac_pton: Use bool not int return
2014-06-25 17:45:43 -07:00
nlattr.c
netlink: pad nla_memcpy dest buffer with zeroes
2015-03-31 14:07:24 -04:00
nmi_backtrace.c
ARM: 8439/1: Fix backtrace generation when IPI is masked
2015-10-03 16:40:51 +01:00
notifier-error-inject.c
mode_t, whack-a-mole at 11...
2013-04-09 14:13:05 -04:00
notifier-error-inject.h
fault-injection: notifier error injection
2012-07-30 17:25:22 -07:00
of-reconfig-notifier-error-inject.c
powerpc+of: Rename and fix OF reconfig notifier error inject module
2012-12-14 10:32:52 +11:00
oid_registry.c
Give the OID registry file module info to avoid kernel tainting
2013-05-05 14:38:00 -07:00
once.c
once: make helper generic for calling functions once
2015-10-08 05:26:36 -07:00
parser.c
lib/parser.c: put EXPORT_SYMBOLs in the conventional place
2014-01-23 16:36:55 -08:00
pci_iomap.c
Merge tag 'libnvdimm-for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2015-09-08 14:35:59 -07:00
percpu_counter.c
percpu_counter: batch size aware __percpu_counter_compare()
2015-05-29 07:39:34 +10:00
percpu_ida.c
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
percpu_test.c
percpu: add test module for various percpu operations
2013-11-13 12:09:11 +09:00
percpu-refcount.c
percpu_ref: make INIT_ATOMIC and switch_to_atomic() sticky
2014-09-24 13:31:50 -04:00
plist.c
lib/plist.c: remove redundant include
2015-02-12 18:54:16 -08:00
pm-notifier-error-inject.c
PM: PM notifier error injection module
2012-07-30 17:25:22 -07:00
proportions.c
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
radix-tree.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
random32.c
random32: add prandom_init_once helper for own rngs
2015-10-08 05:26:38 -07:00
ratelimit.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
rational.c
lib: Change mail address of Oskar Schirmer
2012-05-17 15:18:37 +02:00
rbtree_test.c
rbtree/test: test rbtree_postorder_for_each_entry_safe()
2014-01-23 16:37:03 -08:00
rbtree.c
rbtree: Make lockless searches non-fatal
2015-05-28 11:32:04 +09:30
reciprocal_div.c
reciprocal_divide: update/correction of the algorithm
2014-01-21 23:17:20 -08:00
rhashtable.c
rhashtable: Kill harmless RCU warning in rhashtable_walk_init
2015-12-18 23:44:18 -05:00
scatterlist.c
scatterlist: allow limited chaining without ARCH_HAS_SG_CHAIN
2015-08-17 08:12:51 -06:00
seq_buf.c
seq_buf: Fix seq_buf_bprintf() truncation
2015-03-04 23:40:19 -05:00
sg_split.c
lib: scatterlist: add sg splitting function
2015-08-24 14:28:01 -06:00
sha1.c
lib: EXPORT_SYMBOL sha_init
2015-03-23 22:12:08 -04:00
show_mem.c
lib/show_mem.c: correct reserved memory calculation
2015-09-08 15:35:28 -07:00
smp_processor_id.c
percpu: add preemption checks to __this_cpu ops
2014-04-07 16:36:14 -07:00
sort.c
lib/sort: Add 64 bit swap function
2015-06-25 17:00:40 -07:00
stmp_device.c
lib/stmp_device.c: replace module.h include
2015-02-12 18:54:16 -08:00
string_helpers.c
lib/string_helpers.c: fix infinite loop in string_get_size()
2015-09-17 21:16:07 -07:00
string.c
lib/string.c: add ULL suffix to the constant definition
2015-11-10 16:32:11 -08:00
strncpy_from_user.c
BACKPORT: lib: harden strncpy_from_user
2016-10-18 11:08:46 -07:00
strnlen_user.c
UPSTREAM: unsafe_[get|put]_user: change interface to use a error target label
2016-09-06 15:52:54 +00:00
swiotlb.c
Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block
2015-06-25 15:22:36 -07:00
syscall.c
lib/syscall.c: unexport task_current_syscall()
2014-04-03 16:21:06 -07:00
test_bpf.c
bpf: add mod default A and X test cases
2015-11-05 00:05:50 -05:00
test_firmware.c
test: add firmware_class loader test
2014-07-17 18:44:19 -07:00
test_kasan.c
lib: test_kasan: add some testcases
2015-11-05 19:34:48 -08:00
test_module.c
test: add minimal module for verification testing
2014-01-23 16:36:57 -08:00
test_printf.c
test_printf: test printf family at runtime
2015-11-06 17:50:42 -08:00
test_rhashtable.c
rhashtable-test: extend to test concurrency
2015-08-17 14:33:47 -07:00
test_static_key_base.c
locking/static_keys: Provide a selftest
2015-08-03 11:51:12 +02:00
test_static_keys.c
locking/static_keys: Make verify_keys() static
2015-08-05 09:53:40 +02:00
test_user_copy.c
test: check copy_to/from_user boundary validation
2014-01-23 16:36:57 -08:00
test-hexdump.c
hexdump: Make test data really const
2015-06-25 17:00:40 -07:00
test-kstrtox.c
kstrto*: accept "-0" for signed conversion
2015-09-10 13:29:01 -07:00
test-string_helpers.c
lib/test-string_helpers.c: add string_get_size() tests
2015-11-06 17:50:42 -08:00
textsearch.c
lib/textsearch.c: remove textsearch_put reference from comments
2014-10-14 02:18:14 +02:00
timerqueue.c
timerqueue: Let timerqueue_add/del return information
2015-04-22 17:06:49 +02:00
ts_bm.c
textsearch: ts_bm: support case insensitive searching in Boyer-Moore algorithm
2008-07-08 02:37:54 -07:00
ts_fsm.c
textsearch: ts_fsm: return error on request for case insensitive search
2008-07-08 02:38:27 -07:00
ts_kmp.c
textsearch: ts_kmp: support case insensitive searching in Knuth-Morris-Pratt algorithm
2008-07-08 02:38:09 -07:00
ucs2_string.c
Move utf16 functions to kernel core and rename
2013-04-15 21:23:03 +01:00
usercopy.c
Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
2013-04-30 17:04:09 -07:00
uuid.c
uuid: use prandom_bytes()
2013-04-29 18:28:42 -07:00
vsprintf.c
lib/vsprintf.c: update documentation
2015-11-06 17:50:42 -08:00