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Thomas Gleixner 1baf236084 bpf: Remove recursion prevention from rcu free callback 
[ Upstream commit 8a37963c7a ]

If an element is freed via RCU then recursion into BPF instrumentation
functions is not a concern. The element is already detached from the map
and the RCU callback does not hold any locks on which a kprobe, perf event
or tracepoint attached BPF program could deadlock.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200224145643.259118710@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-10-01 13:14:34 +02:00
..
arraymap.c bpf: decouple btf from seq bpf fs dump and enable more maps 2018-08-13 00:52:45 +02:00
bpf_lru_list.c
bpf_lru_list.h bpf: Only set node->ref = 1 if it has not been set 2017-09-01 09:57:39 -07:00
btf.c bpf: Explicitly memset some bpf info structures declared on the stack 2020-04-02 15:28:23 +02:00
cgroup.c bpf: introduce update_effective_progs() 2018-08-07 14:29:55 +02:00
core.c bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K 2019-07-10 09:53:47 +02:00
cpumap.c cpumap: Avoid warning when CONFIG_DEBUG_PER_CPU_MAPS is enabled 2020-05-02 17:25:53 +02:00
devmap.c bpf: devmap: fix wrong interface selection in notifier_call 2019-12-01 09:17:01 +01:00
disasm.c bpf: Remove struct bpf_verifier_env argument from print_bpf_insn 2018-03-23 17:38:57 +01:00
disasm.h bpf: Remove struct bpf_verifier_env argument from print_bpf_insn 2018-03-23 17:38:57 +01:00
hashtab.c bpf: Remove recursion prevention from rcu free callback 2020-10-01 13:14:34 +02:00
helpers.c bpf: introduce the bpf_get_local_storage() helper function 2018-08-03 00:47:32 +02:00
inode.c bpf: map_seq_next should always increase position index 2020-02-24 08:34:51 +01:00
local_storage.c bpf: allocate local storage buffers using GFP_ATOMIC 2018-12-17 09:24:33 +01:00
lpm_trie.c bpf: lpm_trie: check left child of last leftmost node for NULL 2019-07-03 13:14:48 +02:00
Makefile bpf: silence warning messages in core 2019-07-26 09:14:06 +02:00
map_in_map.c bpf: fix inner map masking to prevent oob under speculation 2019-01-31 08:14:41 +01:00
map_in_map.h bpf: Add syscall lookup support for fd array and htab 2017-06-29 13:13:25 -04:00
offload.c bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill 2020-02-28 16:38:59 +01:00
percpu_freelist.c bpf: fix lockdep false positive in percpu_freelist 2019-03-13 14:02:36 -07:00
percpu_freelist.h bpf: fix lockdep false positive in percpu_freelist 2019-03-13 14:02:36 -07:00
reuseport_array.c bpf: Introduce BPF_MAP_TYPE_REUSEPORT_SOCKARRAY 2018-08-11 01:58:46 +02:00
sockmap.c bpf: sockmap, fix transition through disconnect without close 2018-09-22 02:46:41 +02:00
stackmap.c bpf/stackmap: Fix deadlock with rq_lock in bpf_get_stack() 2019-12-31 16:35:20 +01:00
syscall.c bpf: Check correct cred for CAP_SYSLOG in bpf_dump_raw_ok() 2020-07-16 08:17:27 +02:00
tnum.c bpf: Fix incorrect verifier simulation of ARSH under ALU32 2020-01-23 08:21:32 +01:00
verifier.c bpf: fix buggy r0 retval refinement for tracing helpers 2020-04-23 10:30:24 +02:00
xskmap.c xsk: do not call synchronize_net() under RCU read lock 2018-10-11 10:19:01 +02:00