Thomas Gleixner 500ffa58e7 debugobject: Prevent init race with static objects ... [ Upstream commit 63a759694e ] Statically initialized objects are usually not initialized via the init() function of the subsystem. They are special cased and the subsystem provides a function to validate whether an object which is not yet tracked by debugobjects is statically initialized. This means the object is started to be tracked on first use, e.g. activation. This works perfectly fine, unless there are two concurrent operations on that object. Schspa decoded the problem: T0 T1 debug_object_assert_init(addr) lock_hash_bucket() obj = lookup_object(addr); if (!obj) { unlock_hash_bucket(); - > preemption lock_subsytem_object(addr); activate_object(addr) lock_hash_bucket(); obj = lookup_object(addr); if (!obj) { unlock_hash_bucket(); if (is_static_object(addr)) init_and_track(addr); lock_hash_bucket(); obj = lookup_object(addr); obj->state = ACTIVATED; unlock_hash_bucket(); subsys function modifies content of addr, so static object detection does not longer work. unlock_subsytem_object(addr); if (is_static_object(addr)) <- Fails debugobject emits a warning and invokes the fixup function which reinitializes the already active object in the worst case. This race exists forever, but was never observed until mod_timer() got a debug_object_assert_init() added which is outside of the timer base lock held section right at the beginning of the function to cover the lockless early exit points too. Rework the code so that the lookup, the static object check and the tracking object association happens atomically under the hash bucket lock. This prevents the issue completely as all callers are serialized on the hash bucket lock and therefore cannot observe inconsistent state. Fixes: 3ac7fe5a4a ("infrastructure to debug (dynamic) objects") Reported-by: syzbot+5093ba19745994288b53@syzkaller.appspotmail.com Debugged-by: Schspa Shi <schspa@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Link: https://syzkaller.appspot.com/bug?id=22c8a5938eab640d1c6bcc0e3dc7be519d878462 Link: https://lore.kernel.org/lkml/20230303161906.831686-1-schspa@gmail.com Link: https://lore.kernel.org/r/87zg7dzgao.ffs@tglx Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-05-11 23:00:25 +09:00
..
842	kbuild: trace functions in subdirectories of lib/	2020-08-10 01:32:59 +09:00
crypto	crypto: lib - remove unneeded selection of XOR_BLOCKS	2022-09-05 10:30:03 +02:00
dim	dim: initialize all struct fields	2022-05-18 10:26:49 +02:00
fonts	lib/fonts: fix undefined behavior in bit shift for get_default_font	2022-12-31 13:14:02 +01:00
kunit	kunit: fix debugfs code to use enum kunit_status, not bool	2022-06-09 10:22:53 +02:00
livepatch	selftests/livepatch: better synchronize test_klp_callbacks_busy	2022-08-17 14:24:03 +02:00
lz4	lz4: fix LZ4_decompress_safe_partial read out of bound	2022-04-13 20:59:21 +02:00
lzo	lib/lzo/lzo1x_compress.c: make lzogeneric1x_1_compress() static	2020-12-15 22:46:19 -08:00
math	math: make RATIONAL tristate	2021-09-08 11:50:26 -07:00
mpi	lib/mpi: Fix buffer overrun when SG is too long	2023-03-10 09:39:09 +01:00
pldmfw	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
raid6	lib/raid6/test/Makefile: Use $(pound) instead of \# for Make 4.3	2022-04-08 14:23:56 +02:00
reed_solomon	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
vdso	lib/vdso: use "grep -E" instead of "egrep"	2022-12-02 17:41:08 +01:00
xz	lib/xz: Validate the value before assigning it to an enum variable	2021-11-18 19:16:17 +01:00
zlib_deflate	kbuild: trace functions in subdirectories of lib/	2020-08-10 01:32:59 +09:00
zlib_dfltcc	zlib: move EXPORT_SYMBOL() and MODULE_LICENSE() out of dfltcc_syms.c	2020-12-29 15:36:49 -08:00
zlib_inflate	lib/zlib_inflate/inffast: check config in C to avoid unused function warning	2021-09-24 16:13:35 -07:00
zstd	lib/decompressors: fix spelling mistakes	2021-07-01 11:06:05 -07:00
.gitignore	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
Kconfig	crypto: memneq - move into lib/	2022-06-22 14:22:03 +02:00
Kconfig.debug	lib/Kconfig.debug: Allow BTF + DWARF5 with pahole 1.21+	2023-02-25 12:06:46 +01:00
Kconfig.kasan	kasan: fix Kconfig check of CC_HAS_WORKING_NOSANITIZE_ADDRESS	2021-09-24 16:13:34 -07:00
Kconfig.kcsan	kcsan: Make strict mode imply interruptible watchers	2021-07-20 13:49:44 -07:00
Kconfig.kfence	kfence: default to dynamic branch instead of static keys mode	2021-11-12 15:05:49 +01:00
Kconfig.kgdb	kgdb: Honour the kprobe blocklist when setting breakpoints	2020-09-28 12:14:08 +01:00
Kconfig.ubsan	ubsan: remove CONFIG_UBSAN_OBJECT_SIZE	2022-04-13 20:59:27 +02:00
Makefile	crypto: memneq - move into lib/	2022-06-22 14:22:03 +02:00
argv_split.c	…
ashldi3.c	…
ashrdi3.c	…
asn1_decoder.c	Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"	2020-11-18 14:15:17 -06:00
asn1_encoder.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
assoc_array.c	assoc_array: Fix BUG_ON during garbage collect	2022-06-06 08:43:37 +02:00
atomic64.c	locking/atomic: atomic64: support ARCH_ATOMIC	2021-05-26 13:20:50 +02:00
atomic64_test.c	…
audit.c	…
bcd.c	…
bch.c	lib/bch.c: fix a typo in the file bch.c	2021-05-06 19:24:12 -07:00
bitfield_kunit.c	lib: kunit: Fix compilation test when using TEST_BIT_FIELD_COMPILE	2020-10-16 13:25:14 -06:00
bitmap.c	bitmap: extend comment to bitmap_print_bitmask/list_to_buf	2021-08-13 10:27:50 +02:00
bitrev.c	…
bootconfig.c	memblock: introduce saner 'memblock_free_ptr()' interface	2021-09-14 13:23:22 -07:00
bsearch.c	…
btree.c	…
bucket_locks.c	…
bug.c	bug: Assign values once in bug_get_file_line()	2021-04-01 09:54:37 +01:00
build_OID_registry	…
buildid.c	kdump: use vmlinux_build_id to simplify	2021-07-08 11:48:22 -07:00
bust_spinlocks.c	…
check_signature.c	…
checksum.c	unify generic instances of csum_partial_copy_nocheck()	2020-08-20 15:45:14 -04:00
clz_ctz.c	…
clz_tab.c	…
cmdline.c	lib/cmdline: Export next_arg() for being used in modules	2021-05-05 16:07:40 +02:00
cmdline_kunit.c	lib/cmdline_kunit: Remove a cast which are no-longer required	2021-06-23 16:41:41 -06:00
cmpdi2.c	…
compat_audit.c	…
cpu_rmap.c	…
cpumask.c	Revert "lib: Restrict cpumask_local_spread to houskeeping CPUs"	2021-02-05 23:28:29 +01:00
crc-ccitt.c	…
crc-itu-t.c	…
crc-t10dif.c	…
crc4.c	…
crc7.c	lib/crc7: fix a kernel-doc markup	2021-01-21 14:06:00 -07:00
crc8.c	lib: crc8: pointer to data block should be const	2021-05-06 19:24:12 -07:00
crc16.c	…
crc32.c	lib/crc32.c: fix trivial typo in preprocessor condition	2020-10-16 11:11:20 -07:00
crc32defs.h	…
crc32test.c	lib/crc32test: remove extra local_irq_disable/enable	2020-11-02 12:14:19 -08:00
crc64.c	lib: crc64: fix kernel-doc warning	2021-06-05 08:58:12 -07:00
ctype.c	…
debug_info.c	isystem: ship and use stdarg.h	2021-08-19 09:02:55 +09:00
debug_locks.c	locking/lockdep: Improve noinstr vs errors	2021-06-22 13:56:43 +02:00
debugobjects.c	debugobject: Prevent init race with static objects	2023-05-11 23:00:25 +09:00
dec_and_lock.c	…
decompress.c	…
decompress_bunzip2.c	lib/decompressors: fix spelling mistakes	2021-07-01 11:06:05 -07:00
decompress_inflate.c	…
decompress_unlz4.c	lib/decompress_unlz4.c: correctly handle zero-padding around initrds.	2021-07-01 11:06:06 -07:00
decompress_unlzma.c	lib: fix inconsistent indenting in process_bit1()	2021-05-06 19:24:12 -07:00
decompress_unlzo.c	lib/decompressors: remove set but not used variabled 'level'	2021-07-01 11:06:06 -07:00
decompress_unxz.c	lib/xz: Avoid overlapping memcpy() with invalid input with in-place decompression	2021-11-18 19:16:17 +01:00
decompress_unzstd.c	lib/decompressors: fix spelling mistakes	2021-07-01 11:06:05 -07:00
devmem_is_allowed.c	lib: use PFN_PHYS() in devmem_is_allowed()	2021-08-13 14:09:32 -10:00
devres.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
digsig.c	crypto: sha - split sha.h into sha1.h and sha2.h	2020-11-20 14:45:33 +11:00
dump_stack.c	lib/dump_stack: correct kernel-doc notation	2021-09-08 11:50:26 -07:00
dynamic_debug.c	dyndbg: drop EXPORTed dynamic_debug_exec_queries	2022-10-26 12:35:08 +02:00
dynamic_queue_limits.c	lib: dynamic_queue_limits: delete duplicated words + fix typo	2020-10-16 11:11:20 -07:00
earlycpio.c	lib: remove "expecting prototype" kernel-doc warnings	2021-04-16 16:10:37 -07:00
errname.c	printf: fix errname.c list	2023-03-10 09:39:33 +01:00
error-inject.c	fault-injection: handle EI_ETYPE_TRUE	2020-12-15 22:46:19 -08:00
errseq.c	kernel.h: split out mathematical helpers	2020-12-15 22:46:15 -08:00
extable.c	sparc32: switch to generic extables	2021-01-03 20:05:18 -05:00
fault-inject-usercopy.c	lib, include/linux: add usercopy failure capability	2020-10-16 11:11:22 -07:00
fault-inject.c	…
fdt.c	…
fdt_addresses.c	…
fdt_empty_tree.c	…
fdt_ro.c	…
fdt_rw.c	…
fdt_strerror.c	…
fdt_sw.c	…
fdt_wip.c	…
find_bit.c	lib: add fast path for find_first_*_bit() and find_last_bit()	2021-05-06 19:24:12 -07:00
find_bit_benchmark.c	…
flex_proportions.c	…
gen_crc32table.c	…
gen_crc64table.c	…
genalloc.c	lib/genalloc: add parameter description to fix doc compile warning	2021-05-06 19:24:12 -07:00
generic-radix-tree.c	…
glob.c	Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"	2020-11-18 14:15:17 -06:00
globtest.c	…
hexdump.c	hex2bin: fix access beyond string end	2022-05-09 09:14:30 +02:00
hweight.c	…
idr.c	ida: don't use BUG_ON() for debugging	2022-07-12 16:35:18 +02:00
inflate.c	…
interval_tree.c	…
interval_tree_test.c	…
iomap.c	iomap: constify ioreadX() iomem argument (as in generic implementation)	2020-08-14 19:56:57 -07:00
iomap_copy.c	…
iommu-helper.c	…
iov_iter.c	fix short copy handling in copy_mc_pipe_to_iter()	2022-08-17 14:22:51 +02:00
irq_poll.c	…
irq_regs.c	…
is_single_threaded.c	…
kasprintf.c	isystem: ship and use stdarg.h	2021-08-19 09:02:55 +09:00
kfifo.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
klist.c	…
kobject.c	kobject: Fix slab-out-of-bounds in fill_kobj_path()	2023-03-10 09:39:35 +01:00
kobject_uevent.c	kobject_uevent: remove warning in init_uevent_argv()	2021-04-10 11:09:41 +02:00
kstrtox.c	Merge branch 'akpm' (patches from Andrew)	2021-07-02 12:08:10 -07:00
kstrtox.h	lib: vsprintf: Fix handling of number field widths in vsscanf	2021-05-19 15:05:11 +02:00
libcrc32c.c	lib: libcrc32c: delete duplicated words	2020-10-16 11:11:19 -07:00
linear_ranges.c	lib: add linear range get selector within	2021-08-13 18:37:38 +02:00
list-test.c	list: test: Add a test for list_is_head()	2022-06-09 10:23:31 +02:00
list_debug.c	lib/list_debug.c: Detect uninitialized lists	2022-08-25 11:40:40 +02:00
list_sort.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -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-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	lockdep/selftest: Remove wait-type RCU_CALLBACK tests	2021-06-22 16:42:08 +02:00
lockref.c	lockref: stop doing cpu_relax in the cmpxchg loop	2023-02-01 08:27:19 +01:00
logic_iomem.c	lib/logic_iomem: correct fallback config references	2022-04-13 20:58:59 +02:00
logic_pio.c	PCI: Fix pci_register_io_range() memory leak	2021-02-17 17:31:06 -06:00
lru_cache.c	lib: remove "expecting prototype" kernel-doc warnings	2021-04-16 16:10:37 -07:00
lshrdi3.c	…
memcat_p.c	…
memneq.c	crypto: memneq - move into lib/	2022-06-22 14:22:03 +02:00
memory-notifier-error-inject.c	…
memregion.c	lib/memregion.c: include memregion.h	2020-09-26 10:33:57 -07:00
memweight.c	…
muldi3.c	…
net_utils.c	…
netdev-notifier-error-inject.c	…
nlattr.c	netlink: prevent potential spectre v1 gadgets	2023-02-01 08:27:26 +01:00
nmi_backtrace.c	printk: restore flushing of NMI buffers on remote CPUs after NMI backtraces	2021-11-25 09:48:45 +01:00
nodemask.c	nodemask: Fix return values to be unsigned	2022-06-14 18:36:24 +02:00
notifier-error-inject.c	lib/notifier-error-inject: fix error when writing -errno to debugfs file	2022-12-31 13:14:03 +01:00
notifier-error-inject.h	…
objagg.c	…
of-reconfig-notifier-error-inject.c	…
oid_registry.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
once.c	once: add DO_ONCE_SLOW() for sleepable contexts	2022-10-26 12:34:49 +02:00
packing.c	net: update NXP copyright text	2021-09-17 13:52:17 +01:00
parman.c	lib: remove "expecting prototype" kernel-doc warnings	2021-04-16 16:10:37 -07:00
parser.c	kernel.h: split out kstrtox() and simple_strtox() to a separate header	2021-07-01 11:06:05 -07:00
pci_iomap.c	pci_iounmap'2: Electric Boogaloo: try to make sense of it all	2021-09-19 17:13:35 -07:00
percpu-refcount.c	percpu_ref_init(): clean ->percpu_count_ref on failure	2022-06-06 08:43:36 +02:00
percpu_counter.c	lib/percpu_counter: tame kernel-doc compile warning	2021-05-06 19:24:12 -07:00
percpu_test.c	…
plist.c	…
pm-notifier-error-inject.c	…
radix-tree.c	lib: remove "expecting prototype" kernel-doc warnings	2021-04-16 16:10:37 -07:00
random32.c	random: replace custom notifier chain with standard one	2022-05-30 09:29:10 +02:00
ratelimit.c	ratelimit: Fix data-races in ___ratelimit().	2022-08-31 17:16:43 +02:00
rbtree.c	lib/: replace HTTP links with HTTPS ones	2020-08-12 10:58:00 -07:00
rbtree_test.c	…
refcount.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
rhashtable.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
sbitmap.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
scatterlist.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
seq_buf.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
sg_pool.c	lib/scatterlist: Fix wrong update of orig_nents	2021-08-24 19:52:40 -03:00
sg_split.c	…
sha1.c	lib/crypto: sha1: re-roll loops to reduce code size	2022-05-30 09:28:59 +02:00
show_mem.c	…
siphash.c	siphash: use one source of truth for siphash permutations	2022-05-30 09:29:15 +02:00
slub_kunit.c	mm/slub, kunit: add a KUnit test for SLUB debugging functionality	2021-06-29 10:53:46 -07:00
smp_processor_id.c	lib/smp_processor_id: fix imbalanced instrumentation_end() call	2022-08-17 14:24:08 +02:00
sort.c	lib: fix spelling mistakes	2021-07-08 11:48:20 -07:00
stackdepot.c	stacktrace: move filter_irq_stacks() to kernel/stacktrace.c	2022-04-13 20:59:28 +02:00
stmp_device.c	…
string.c	string: improve default out-of-line memcmp() implementation	2021-08-30 07:50:56 -07:00
string_helpers.c	string: uninline memcpy_and_pad	2021-11-21 13:44:12 +01:00
strncpy_from_user.c	lib/strncpy_from_user.c: Mask out bytes after NUL terminator.	2020-11-19 11:56:16 -08:00
strnlen_user.c	…
syscall.c	sched: Change task_struct::state	2021-06-18 11:43:09 +02:00
test-kstrtox.c	…
test-string_helpers.c	string_helpers: Escape double quotes in escape_special	2021-07-19 11:39:28 +02:00
test_bitmap.c	lib: test_bitmap: add bitmap_print_bitmask/list_to_buf test cases	2021-08-13 10:27:49 +02:00
test_bitops.c	lib/test: fix spelling mistakes	2021-07-08 11:48:20 -07:00
test_bits.c	lib/test_bits.c: add tests of GENMASK	2020-08-12 10:58:00 -07:00
test_blackhole_dev.c	…
test_bpf.c	test_bpf: fix incorrect netdev features	2022-08-17 14:23:23 +02:00
test_debug_virtual.c	…
test_firmware.c	test_firmware: fix memory leak in test_firmware_init()	2022-12-31 13:14:29 +01:00
test_fpu.c	selftests/fpu: Fix debugfs_simple_attr.cocci warning	2021-01-18 11:03:26 +01:00
test_free_pages.c	lib/test_free_pages.c: add basic progress indicators	2020-12-15 22:46:16 -08:00
test_hash.c	…
test_hexdump.c	…
test_hmm.c	lib/test_hmm: avoid accessing uninitialized pages	2022-08-17 14:23:43 +02:00
test_hmm_uapi.h	mm: selftests for exclusive device memory	2021-07-01 11:06:03 -07:00
test_ida.c	…
test_kasan.c	kasan: test: Silence GCC 12 warnings	2022-08-17 14:23:05 +02:00
test_kasan_module.c	kasan: test: avoid corrupting memory in kasan_rcu_uaf	2021-09-03 09:58:15 -07:00
test_kmod.c	lib/test: use after free in register_test_dev_kmod()	2022-04-08 14:23:54 +02:00
test_linear_ranges.c	…
test_list_sort.c	lib/test: convert lib/test_list_sort.c to use KUnit	2021-06-25 11:31:03 -06:00
test_lockup.c	lib/test_lockup: fix kernel pointer check for separate address spaces	2022-04-08 14:24:01 +02:00
test_memcat_p.c	…
test_meminit.c	lib/test_meminit: destroy cache in kmem_cache_alloc_bulk() test	2022-01-27 11:05:44 +01:00
test_min_heap.c	…
test_module.c	…
test_objagg.c	…
test_overflow.c	overflow: Implement size_t saturating arithmetic helpers	2022-12-31 13:14:33 +01:00
test_parman.c	…
test_printf.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
test_rhashtable.c	rhashtable: avoid -Wrestrict warning on overlapping sprintf output	2021-03-24 15:16:09 -07:00
test_scanf.c	lib/test_scanf: split up number parsing test routines	2021-09-06 11:04:03 -07:00
test_siphash.c	…
test_sort.c	lib/test: convert test_sort.c to use KUnit	2021-09-08 11:50:26 -07:00
test_stackinit.c	lib/test_stackinit: Add assigned initializers	2021-08-22 00:21:36 -07:00
test_static_key_base.c	…
test_static_keys.c	…
test_string.c	lib/test_string.c: allow module removal	2021-07-01 11:06:05 -07:00
test_strscpy.c	…
test_sysctl.c	lib: test_sysctl: delete duplicated words	2020-10-16 11:11:20 -07:00
test_ubsan.c	ubsan: remove CONFIG_UBSAN_OBJECT_SIZE	2022-04-13 20:59:27 +02:00
test_user_copy.c	…
test_uuid.c	…
test_vmalloc.c	lib/test_vmalloc.c: add a new 'nr_pages' parameter	2021-09-03 09:58:14 -07:00
test_xarray.c	XArray: Fix xas_create_range() when multi-order entry present	2022-04-08 14:24:09 +02:00
textsearch.c	…
timerqueue.c	rbtree, timerqueue: Use rb_add_cached()	2021-02-17 14:08:01 +01:00
ts_bm.c	lib/: replace HTTP links with HTTPS ones	2020-08-12 10:58:00 -07:00
ts_fsm.c	Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"	2020-11-18 14:15:17 -06:00
ts_kmp.c	…
ubsan.c	panic: Consolidate open-coded panic_on_warn checks	2023-02-01 08:27:22 +01:00
ubsan.h	ubsan: implement __ubsan_handle_alignment_assumption	2021-02-05 11:03:47 -08:00
ucmpdi2.c	…
ucs2_string.c	…
usercopy.c	uaccess: Add speculation barrier to copy_from_user()	2023-02-25 12:06:44 +01:00
uuid.c	…
vsprintf.c	random: replace custom notifier chain with standard one	2022-05-30 09:29:10 +02:00
win_minmax.c	…
xarray.c	XArray: Update the LRU list in xas_split()	2022-04-08 14:24:09 +02:00
xxhash.c	lib/: replace HTTP links with HTTPS ones	2020-08-12 10:58:00 -07:00