Hou Tao 197827a05e bpf: Use this_cpu_{inc|dec|inc_return} for bpf_task_storage_busy ... Now migrate_disable() does not disable preemption and under some architectures (e.g. arm64) __this_cpu_{inc|dec|inc_return} are neither preemption-safe nor IRQ-safe, so for fully preemptible kernel concurrent lookups or updates on the same task local storage and on the same CPU may make bpf_task_storage_busy be imbalanced, and bpf_task_storage_trylock() on the specific cpu will always fail. Fixing it by using this_cpu_{inc|dec|inc_return} when manipulating bpf_task_storage_busy. Fixes: bc235cdb42 ("bpf: Prevent deadlock from recursive bpf_task_storage_[get|delete]") Signed-off-by: Hou Tao <houtao1@huawei.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/r/20220901061938.3789460-2-houtao@huaweicloud.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>		2022-09-01 12:16:12 -07:00
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preload	bpf: iterators: Build and use lightweight bootstrap version of bpftool	2022-07-15 12:01:30 -07:00
arraymap.c	bpf: Acquire map uref in .init_seq_private for array map iterator	2022-08-10 10:12:47 -07:00
bloom_filter.c	bpf: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
bpf_inode_storage.c	bpf: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
bpf_iter.c	bpf: Initialize the bpf_run_ctx in bpf_iter_run_prog()	2022-08-18 17:06:13 -07:00
bpf_local_storage.c	bpf: Use this_cpu_{inc|dec|inc_return} for bpf_task_storage_busy	2022-09-01 12:16:12 -07:00
bpf_lru_list.c	bpf_lru_list: Read double-checked variable once without lock	2021-02-10 15:54:26 -08:00
bpf_lru_list.h	printk: stop including cache.h from printk.h	2022-05-13 07:20:07 -07:00
bpf_lsm.c	bpf: Use cgroup_{common,current}_func_proto in more hooks	2022-08-23 16:08:21 -07:00
bpf_struct_ops_types.h	bpf: Add dummy BPF STRUCT_OPS for test purpose	2021-11-01 14:10:00 -07:00
bpf_struct_ops.c	bpf: Remove is_valid_bpf_tramp_flags()	2022-07-11 21:04:58 +02:00
bpf_task_storage.c	bpf: Use this_cpu_{inc|dec|inc_return} for bpf_task_storage_busy	2022-09-01 12:16:12 -07:00
btf.c	bpf: Always return corresponding btf_type in __get_type_size()	2022-08-09 10:30:45 -07:00
cgroup_iter.c	bpf: Add CGROUP prefix to cgroup_iter_order	2022-08-25 16:26:37 -07:00
cgroup.c	bpf: expose bpf_strtol and bpf_strtoul to all program types	2022-08-23 16:08:21 -07:00
core.c	bpf: Add BPF-helper for accessing CLOCK_TAI	2022-08-09 09:47:13 -07:00
cpumap.c	bpf: Use bpf_map_area_alloc consistently on bpf map creation	2022-08-10 11:50:43 -07:00
devmap.c	bpf: Use bpf_map_area_alloc consistently on bpf map creation	2022-08-10 11:50:43 -07:00
disasm.c	bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause	2021-09-02 14:49:23 +02:00
disasm.h	bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause	2021-09-02 14:49:23 +02:00
dispatcher.c	bpf: Remove bpf_image tree	2020-03-13 12:49:52 -07:00
hashtab.c	bpf: Propagate error from htab_lock_bucket() to userspace	2022-08-31 14:10:01 -07:00
helpers.c	bpf: Move bpf_loop and bpf_for_each_map_elem under CAP_BPF	2022-08-23 16:21:59 -07:00
inode.c	bpf: Convert bpf_preload.ko to use light skeleton.	2022-02-10 23:31:51 +01:00
Kconfig	rcu: Make the TASKS_RCU Kconfig option be selected	2022-04-20 16:52:58 -07:00
link_iter.c	bpf: Add bpf_link iterator	2022-05-10 11:20:45 -07:00
local_storage.c	bpf: Use bpf_map_area_alloc consistently on bpf map creation	2022-08-10 11:50:43 -07:00
lpm_trie.c	bpf: Use bpf_map_area_alloc consistently on bpf map creation	2022-08-10 11:50:43 -07:00
Makefile	bpf: Introduce cgroup iter	2022-08-25 11:35:37 -07:00
map_in_map.c	bpf: Allow storing unreferenced kptr in map	2022-04-25 17:31:35 -07:00
map_in_map.h	bpf: Add map_meta_equal map ops	2020-08-28 15:41:30 +02:00
map_iter.c	bpf: Introduce MEM_RDONLY flag	2021-12-18 13:27:41 -08:00
mmap_unlock_work.h	bpf: Introduce helper bpf_find_vma	2021-11-07 11:54:51 -08:00
net_namespace.c	net: Add includes masked by netdevice.h including uapi/bpf.h	2021-12-29 20:03:05 -08:00
offload.c	bpf: Use bpf_map_area_alloc consistently on bpf map creation	2022-08-10 11:50:43 -07:00
percpu_freelist.c	bpf: avoid grabbing spin_locks of all cpus when no free elems	2022-06-11 14:25:35 -07:00
percpu_freelist.h	bpf: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI	2020-10-06 00:04:11 +02:00
prog_iter.c	bpf: Refactor bpf_iter_reg to have separate seq_info member	2020-07-25 20:16:32 -07:00
queue_stack_maps.c	bpf: Remove unneeded memset in queue_stack_map creation	2022-08-10 11:48:22 -07:00
reuseport_array.c	net: refactor bpf_sk_reuseport_detach()	2022-08-10 21:48:04 -07:00
ringbuf.c	bpf: Use bpf_map_area_alloc consistently on bpf map creation	2022-08-10 11:50:43 -07:00
stackmap.c	bpf: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
syscall.c	bpf: prepare for more bpf syscall to be used from kernel and user space.	2022-08-25 18:52:05 -07:00
sysfs_btf.c	bpf: Load and verify kernel module BTFs	2020-11-10 15:25:53 -08:00
task_iter.c	bpf: Remove redundant assignment to meta.seq in __task_seq_show()	2022-04-11 21:14:34 +02:00
tnum.c	bpf, tnums: Provably sound, faster, and more precise algorithm for tnum_mul	2021-06-01 13:34:15 +02:00
trampoline.c	bpf: Cleanup ftrace hash in bpf_trampoline_put	2022-08-05 09:43:58 -07:00
verifier.c	bpf: Fix reference state management for synchronous callbacks	2022-08-24 17:54:08 -07:00