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b6e5dae15a
linux-next/kernel/bpf
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Thomas Gleixner b6e5dae15a bpf: Replace open coded recursion prevention in sys_bpf() 
The required protection is that the caller cannot be migrated to a
different CPU as these functions end up in places which take either a hash
bucket lock or might trigger a kprobe inside the memory allocator. Both
scenarios can lead to deadlocks. The deadlock prevention is per CPU by
incrementing a per CPU variable which temporarily blocks the invocation of
BPF programs from perf and kprobes.

Replace the open coded preempt_[dis|en]able and __this_cpu_[inc|dec] pairs
with the new helper functions. These functions are already prepared to make
BPF work on PREEMPT_RT enabled kernels. No functional change for !RT
kernels.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200224145644.317843926@linutronix.de
2020-02-24 16:20:10 -08:00
..
arraymap.c bpf: Add lookup and update batch ops to arraymap 2020-01-15 14:00:35 -08:00
bpf_lru_list.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
bpf_lru_list.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
bpf_struct_ops_types.h bpf: tcp: Support tcp_congestion_ops in bpf 2020-01-09 08:46:18 -08:00
bpf_struct_ops.c bpf: Reuse log from btf_prase_vmlinux() in btf_struct_ops_init() 2020-01-29 16:40:54 +01:00
btf.c bpf: Make btf_check_func_type_match() static 2020-02-11 00:22:47 +01:00
cgroup.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-01-09 12:13:43 -08:00
core.c bpf: Add BPF_FUNC_jiffies64 2020-01-22 16:30:10 -08:00
cpumap.c xdp: Make cpumap flush_list common for all map instances 2019-12-19 21:09:43 -08:00
devmap.c bpf, xdp: Remove no longer required rcu_read_{un}lock() 2020-01-27 11:16:25 +01:00
disasm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
disasm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
dispatcher.c bpf: Allow to resolve bpf trampoline and dispatcher in unwind 2020-01-25 07:12:40 -08:00
hashtab.c bpf: Use recursion prevention helpers in hashtab code 2020-02-24 16:20:10 -08:00
helpers.c bpf: Add BPF_FUNC_jiffies64 2020-01-22 16:30:10 -08:00
inode.c Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-02-08 13:26:41 -08:00
local_storage.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-22 09:54:33 -08:00
lpm_trie.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-22 08:59:24 -04:00
Makefile bpf: Introduce BPF_PROG_TYPE_STRUCT_OPS 2020-01-09 08:46:18 -08:00
map_in_map.c bpf: Introduce BPF_MAP_TYPE_STRUCT_OPS 2020-01-09 08:46:18 -08:00
map_in_map.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
offload.c bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill 2020-02-17 16:53:49 +01:00
percpu_freelist.c bpf: Dont iterate over possible CPUs with interrupts disabled 2020-02-24 16:18:20 -08:00
percpu_freelist.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
queue_stack_maps.c bpf: move memory size checks to bpf_map_charge_init() 2019-05-31 16:52:56 -07:00
reuseport_array.c net: Generate reuseport group ID on group creation 2020-02-21 22:29:45 +01:00
stackmap.c Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-12-03 09:29:50 -08:00
syscall.c bpf: Replace open coded recursion prevention in sys_bpf() 2020-02-24 16:20:10 -08:00
sysfs_btf.c btf: fix return value check in btf_vmlinux_init() 2019-08-15 22:18:17 -07:00
tnum.c bpf: Fix incorrect verifier simulation of ARSH under ALU32 2020-01-15 13:39:59 -08:00
trampoline.c bpf: Use migrate_disable/enabe() in trampoline code. 2020-02-24 16:20:09 -08:00
verifier.c bpf: Enforce preallocation for instrumentation programs on RT 2020-02-24 16:12:19 -08:00
xskmap.c xsk: Make xskmap flush_list common for all map instances 2019-12-19 21:09:43 -08:00