Toke Høiland-Jørgensen a34a9f1a19 bpf: Avoid deadlock when using queue and stack maps from NMI ... Sysbot discovered that the queue and stack maps can deadlock if they are being used from a BPF program that can be called from NMI context (such as one that is attached to a perf HW counter event). To fix this, add an in_nmi() check and use raw_spin_trylock() in NMI context, erroring out if grabbing the lock fails. Fixes: f1a2e44a3a ("bpf: add queue and stack maps") Reported-by: Hsin-Wei Hung <hsinweih@uci.edu> Tested-by: Hsin-Wei Hung <hsinweih@uci.edu> Co-developed-by: Hsin-Wei Hung <hsinweih@uci.edu> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Link: https://lore.kernel.org/r/20230911132815.717240-1-toke@redhat.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2023-09-11 19:04:49 -07:00
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preload	bpf: make preloaded map iterators to display map elements count	2023-07-06 12:42:25 -07:00
arraymap.c
bloom_filter.c
bpf_cgrp_storage.c
bpf_inode_storage.c
bpf_iter.c
bpf_local_storage.c	bpf: bpf_sk_storage: Fix the missing uncharge in sk_omem_alloc	2023-09-06 11:08:14 +02:00
bpf_lru_list.c
bpf_lru_list.h	bpf: lru: Remove unused declaration bpf_lru_promote()	2023-08-08 17:21:42 -07:00
bpf_lsm.c
bpf_struct_ops_types.h
bpf_struct_ops.c	bpf: Support default .validate() and .update() behavior for struct_ops links	2023-08-14 22:23:39 -07:00
bpf_task_storage.c
btf.c	Probes updates for v6.6:	2023-09-02 11:10:50 -07:00
cgroup_iter.c
cgroup.c
core.c	bpf: fix bpf_probe_read_kernel prototype mismatch	2023-08-02 14:14:17 -07:00
cpumap.c	bpf, cpumask: Clean up bpf_cpu_map_entry directly in cpu_map_free	2023-08-21 15:21:16 -07:00
cpumask.c	bpf: Convert bpf_cpumask to bpf_mem_cache_free_rcu.	2023-07-12 23:45:23 +02:00
devmap.c	bpf, devmap: Remove unused dtab field from bpf_dtab_netdev	2023-07-31 18:26:08 -07:00
disasm.c	bpf: change bpf_alu_sign_string and bpf_movsx_string to static	2023-08-04 16:15:50 -07:00
disasm.h
dispatcher.c
hashtab.c	bpf: populate the per-cpu insertions/deletions counters for hashmaps	2023-07-06 12:42:25 -07:00
helpers.c	bpf: Allow bpf_spin_{lock,unlock} in sleepable progs	2023-08-25 09:23:17 -07:00
inode.c	bpf: convert to ctime accessor functions	2023-07-24 10:30:07 +02:00
Kconfig	bpf: Add fd-based tcx multi-prog infra with link support	2023-07-19 10:07:27 -07:00
link_iter.c
local_storage.c
log.c
lpm_trie.c
Makefile	bpf: Add fd-based tcx multi-prog infra with link support	2023-07-19 10:07:27 -07:00
map_in_map.c
map_in_map.h
map_iter.c	bpf: allow any program to use the bpf_map_sum_elem_count kfunc	2023-07-19 09:48:53 -07:00
memalloc.c	bpf: Ensure unit_size is matched with slab cache object size	2023-09-11 12:41:37 -07:00
mmap_unlock_work.h
mprog.c	bpf: Fix mprog detachment for empty mprog entry	2023-08-04 09:35:39 -07:00
net_namespace.c
offload.c	net: invert the netdevice.h vs xdp.h dependency	2023-08-03 08:38:07 -07:00
percpu_freelist.c
percpu_freelist.h
prog_iter.c
queue_stack_maps.c	bpf: Avoid deadlock when using queue and stack maps from NMI	2023-09-11 19:04:49 -07:00
reuseport_array.c
ringbuf.c	bpf: Remove unnecessary ring buffer size check	2023-07-05 14:09:45 +02:00
stackmap.c
syscall.c	bpf: Assign bpf_tramp_run_ctx::saved_run_ctx before recursion check.	2023-09-06 10:44:28 +02:00
sysfs_btf.c
task_iter.c
tcx.c	tcx: Fix splat during dev unregister	2023-07-31 14:44:02 -07:00
tnum.c
trampoline.c	bpf: Assign bpf_tramp_run_ctx::saved_run_ctx before recursion check.	2023-09-06 10:44:28 +02:00
verifier.c	bpf: Allow bpf_spin_{lock,unlock} in sleepable progs	2023-08-25 09:23:17 -07:00