Hou Tao 997849c4b9 bpf: Zeroing allocated object from slab in bpf memory allocator ... Currently the freed element in bpf memory allocator may be immediately reused, for htab map the reuse will reinitialize special fields in map value (e.g., bpf_spin_lock), but lookup procedure may still access these special fields, and it may lead to hard-lockup as shown below: NMI backtrace for cpu 16 CPU: 16 PID: 2574 Comm: htab.bin Tainted: G L 6.1.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), RIP: 0010:queued_spin_lock_slowpath+0x283/0x2c0 ...... Call Trace: <TASK> copy_map_value_locked+0xb7/0x170 bpf_map_copy_value+0x113/0x3c0 __sys_bpf+0x1c67/0x2780 __x64_sys_bpf+0x1c/0x20 do_syscall_64+0x30/0x60 entry_SYSCALL_64_after_hwframe+0x46/0xb0 ...... </TASK> For htab map, just like the preallocated case, these is no need to initialize these special fields in map value again once these fields have been initialized. For preallocated htab map, these fields are initialized through __GFP_ZERO in bpf_map_area_alloc(), so do the similar thing for non-preallocated htab in bpf memory allocator. And there is no need to use __GFP_ZERO for per-cpu bpf memory allocator, because __alloc_percpu_gfp() does it implicitly. Fixes: 0fd7c5d433 ("bpf: Optimize call_rcu in non-preallocated hash map.") Signed-off-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/r/20230215082132.3856544-2-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2023-02-15 15:40:06 -08:00
..
bpf	bpf: Zeroing allocated object from slab in bpf memory allocator	2023-02-15 15:40:06 -08:00
cgroup	bpf-next-for-netdev	2023-02-10 17:51:27 -08:00
configs	mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED	2022-12-01 00:09:20 +01:00
debug	kdb: use srcu console list iterator	2022-12-02 11:25:00 +01:00
dma	dma-mapping: reject GFP_COMP for noncoherent allocations	2022-12-21 08:45:38 +01:00
entry	entry: kmsan: introduce kmsan_unpoison_entry_regs()	2022-10-03 14:03:25 -07:00
events	perf: Fix perf_event_pmu_context serialization	2023-01-31 20:37:18 +01:00
futex	- Prevent the leaking of a debug timer in futex_waitv()	2023-01-01 11:15:05 -08:00
gcov	gcov: add support for checksum field	2022-12-21 14:31:52 -08:00
irq	Char/Misc driver fixes for 6.2-rc7	2023-02-05 11:52:23 -08:00
kcsan	kcsan: test: don't put the expect array on the stack	2023-01-02 08:59:33 -08:00
livepatch	livepatch: Improve the search performance of module_kallsyms_on_each_symbol()	2023-01-19 17:07:15 -08:00
locking	- Prevent the leaking of a debug timer in futex_waitv()	2023-01-01 11:15:05 -08:00
module	bpf-next-for-netdev	2023-01-28 00:00:14 -08:00
power	PM: sleep: Refine error message in try_to_freeze_tasks()	2022-12-06 12:04:34 +01:00
printk	Merge branch 'rework/console-list-lock' into for-linus	2023-01-19 14:56:38 +01:00
rcu	Urgent RCU pull request for v6.2	2022-12-21 07:59:57 -08:00
sched	sched/topology: Introduce sched_numa_hop_mask()	2023-02-07 18:20:00 -08:00
time	time: Fix various kernel-doc problems	2023-01-03 11:07:58 +01:00
trace	bpf-next-for-netdev	2023-02-10 17:51:27 -08:00
.gitignore
acct.c	acct: fix potential integer overflow in encode_comp_t()	2022-11-30 16:13:18 -08:00
async.c
audit.c	audit: use time_after to compare time	2022-08-29 19:47:03 -04:00
audit.h	audit: remove selinux_audit_rule_update() declaration	2022-09-07 11:30:15 -04:00
audit_fsnotify.c	audit: fix potential double free on error path from fsnotify_add_inode_mark	2022-08-22 18:50:06 -04:00
audit_tree.c
audit_watch.c	audit_init_parent(): constify path	2022-09-01 17:39:30 -04:00
auditfilter.c
auditsc.c	audit: unify audit_filter_{uring(), inode_name(), syscall()}	2022-10-17 14:24:42 -04:00
backtracetest.c
bounds.c	mm: multi-gen LRU: minimal implementation	2022-09-26 19:46:09 -07:00
capability.c	caps: use type safe idmapping helpers	2022-10-26 10:02:39 +02:00
cfi.c	cfi: Switch to -fsanitize=kcfi	2022-09-26 10:13:13 -07:00
compat.c
configs.c
context_tracking.c	MAINTAINERS: Add Paul as context tracking maintainer	2022-07-05 13:33:00 -07:00
cpu.c	cpu/hotplug: Do not bail-out in DYING/STARTING sections	2022-12-02 12:43:02 +01:00
cpu_pm.c	context_tracking: Take IRQ eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
crash_core.c	vmcoreinfo: warn if we exceed vmcoreinfo data size	2022-11-30 16:13:17 -08:00
crash_dump.c
cred.c	cred: Do not default to init_cred in prepare_kernel_cred()	2022-11-01 10:04:52 -07:00
delayacct.c	delayacct: support re-entrance detection of thrashing accounting	2022-09-26 19:46:07 -07:00
dma.c
exec_domain.c
exit.c	exit: Use READ_ONCE() for all oops/warn limit reads	2022-12-16 12:26:57 -08:00
extable.c	context_tracking: Take NMI eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
fail_function.c	fail_function: fix wrong use of fei_attr_remove()	2022-09-11 21:55:11 -07:00
fork.c	New Feature:	2022-12-17 14:06:53 -06:00
freezer.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
gen_kheaders.sh	kheaders: explicitly validate existence of cpio command	2023-01-18 16:34:04 +09:00
groups.c	security: Add LSM hook to setgroups() syscall	2022-07-15 18:21:49 +00:00
hung_task.c	sched: Fix more TASK_state comparisons	2022-09-30 16:50:39 +02:00
iomem.c
irq_work.c
jump_label.c	jump_label: Prevent key->enabled int overflow	2022-12-01 15:53:05 -08:00
kallsyms.c	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
kallsyms_internal.h	kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]	2022-11-12 18:47:36 -08:00
kallsyms_selftest.c	kallsyms: Fix scheduling with interrupts disabled in self-test	2023-01-13 15:09:08 -08:00
kallsyms_selftest.h	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: kmsan: unpoison area->list in kcov_remote_area_put()	2022-10-03 14:03:23 -07:00
kexec.c	panic, kexec: make __crash_kexec() NMI safe	2022-09-11 21:55:06 -07:00
kexec_core.c	bpf: Add __bpf_kfunc tag to all kfuncs	2023-02-02 00:25:14 +01:00
kexec_elf.c
kexec_file.c	kexec: replace crash_mem_range with range	2022-11-18 13:55:07 -08:00
kexec_internal.h	panic, kexec: make __crash_kexec() NMI safe	2022-09-11 21:55:06 -07:00
kheaders.c
kmod.c
kprobes.c	kprobes: kretprobe events missing on 2-core KVM guest	2022-12-15 08:48:40 +09:00
ksysfs.c	kernel/ksysfs.c: export kernel cpu byteorder	2022-11-10 19:07:31 +01:00
kthread.c	signal: break out of wait loops on kthread_stop()	2022-10-09 16:01:59 -07:00
latencytop.c	latencytop: use the last element of latency_record of system	2022-09-11 21:55:12 -07:00
Makefile	kernel hardening fixes for v6.2-rc1	2022-12-23 12:00:24 -08:00
module_signature.c
notifier.c	notifier: repair slips in kernel-doc comments	2022-11-30 19:32:30 +01:00
nsproxy.c	fs/exec: switch timens when a task gets a new mm	2022-10-25 15:15:52 -07:00
padata.c	Kbuild updates for v6.2	2022-12-19 12:33:32 -06:00
panic.c	kernel hardening fixes for v6.2-rc1	2022-12-23 12:00:24 -08:00
params.c	Driver Core changes for 6.2-rc1	2022-12-16 03:54:54 -08:00
pid.c	gfs2: Add glockfd debugfs file	2022-06-29 13:07:16 +02:00
pid_namespace.c
profile.c	kernel/profile.c: simplify duplicated code in profile_setup()	2022-09-11 21:55:12 -07:00
ptrace.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
range.c
reboot.c	kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode	2022-10-04 15:59:36 +02:00
regset.c
relay.c	relay: fix type mismatch when allocating memory in relay_create_buf()	2022-12-11 19:30:19 -08:00
resource.c	Driver Core changes for 6.2-rc1	2022-12-16 03:54:54 -08:00
resource_kunit.c
rseq.c	rseq: Use pr_warn_once() when deprecated/unknown ABI flags are encountered	2022-11-14 09:58:32 +01:00
scftorture.c
scs.c	scs: add support for dynamic shadow call stacks	2022-11-09 18:06:35 +00:00
seccomp.c
signal.c	hardening updates for v6.2-rc1	2022-12-14 12:20:00 -08:00
smp.c	bitmap patches for v6.1-rc1	2022-10-10 12:49:34 -07:00
smpboot.c	smpboot: use atomic_try_cmpxchg in cpu_wait_death and cpu_report_death	2022-09-11 21:55:10 -07:00
smpboot.h
softirq.c	context_tracking: Take IRQ eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
stackleak.c
stacktrace.c
static_call.c
static_call_inline.c	static_call: Add call depth tracking support	2022-10-17 16:41:16 +02:00
stop_machine.c
sys.c	prlimit: do_prlimit needs to have a speculation check	2023-01-21 16:14:17 +01:00
sys_ni.c	kernel/sys_ni: add compat entry for fadvise64_64	2022-08-20 15:17:45 -07:00
sysctl-test.c	kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}	2022-09-08 16:56:45 -07:00
sysctl.c	MM patches for 6.2-rc1.	2022-12-13 19:29:45 -08:00
task_work.c	task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run	2022-09-11 21:55:10 -07:00
taskstats.c	genetlink: start to validate reserved header bytes	2022-08-29 12:47:15 +01:00
torture.c
tracepoint.c	tracepoint: Optimize the critical region of mutex_lock in tracepoint_module_coming()	2022-09-26 13:01:18 -04:00
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
up.c
user-return-notifier.c
user.c	kernel/user: Allow user_struct::locked_vm to be usable for iommufd	2022-11-30 20:16:49 -04:00
user_namespace.c	ucounts: Split rlimit and ucount values and max values	2022-10-09 16:24:05 -07:00
usermode_driver.c
utsname.c
utsname_sysctl.c	kernel/utsname_sysctl.c: Fix hostname polling	2022-10-23 12:01:01 -07:00
watch_queue.c	This was a moderately busy cycle for documentation, but nothing all that	2022-08-02 19:24:24 -07:00
watchdog.c	powerpc updates for 6.0	2022-08-06 16:38:17 -07:00
watchdog_hld.c	Revert "printk: add functions to prefer direct printing"	2022-06-23 18:41:40 +02:00
workqueue.c	workqueue: Make queue_rcu_work() use call_rcu_hurry()	2022-11-30 13:17:05 -08:00
workqueue_internal.h