Hou Tao d247049f4f bpf: Only allow sleepable program for resched-able iterator ... When a sleepable program is attached to a hash map iterator, might_fault() will report "BUG: sleeping function called from invalid context..." if CONFIG_DEBUG_ATOMIC_SLEEP is enabled. The reason is that rcu_read_lock() is held in bpf_hash_map_seq_next() and won't be released until all elements are traversed or bpf_hash_map_seq_stop() is called. Fixing it by reusing BPF_ITER_RESCHED to indicate that only non-sleepable program is allowed for iterator without BPF_ITER_RESCHED. We can revise bpf_iter_link_attach() later if there are other conditions which may cause rcu_read_lock() or spin_lock() issues. Signed-off-by: Hou Tao <houtao1@huawei.com> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/r/20220810080538.1845898-7-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2022-08-10 10:12:48 -07:00
..
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: Only allow sleepable program for resched-able iterator	2022-08-10 10:12:48 -07:00
bpf_local_storage.c	bpf: Fix usage of trace RCU in local storage.	2022-04-19 17:55:45 -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: fix lsm_cgroup build errors on esoteric configs	2022-07-19 09:40:41 -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: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
btf.c	bpf: btf: Fix vsnprintf return value check	2022-07-29 09:57:14 -07:00
cgroup.c	bpf: implement BPF_PROG_QUERY for BPF_LSM_CGROUP	2022-06-29 13:21:52 -07:00
core.c	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2022-07-22 16:55:44 -07:00
cpumap.c	bpf: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
devmap.c	bpf, devmap: Compute proper xdp_frame len redirecting frames	2022-07-26 16:26:19 +02:00
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: Acquire map uref in .init_seq_private for hash map iterator	2022-08-10 10:12:47 -07:00
helpers.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2022-07-14 15:27:35 -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: Make non-preallocated allocation low priority	2022-07-12 17:44:27 -07:00
lpm_trie.c	bpf: Make non-preallocated allocation low priority	2022-07-12 17:44:27 -07:00
Makefile	bpf: Add bpf_link iterator	2022-05-10 11:20:45 -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, 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: 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: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
reuseport_array.c	bpf: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
ringbuf.c	bpf: Dynptr support for ring buffers	2022-05-23 14:31:28 -07:00
stackmap.c	bpf: Compute map_btf_id during build time	2022-04-26 11:35:21 -07:00
syscall.c	bpf: Disallow bpf programs call prog_run command.	2022-08-10 09:43:07 -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: Switch to new kfunc flags infrastructure	2022-07-21 20:59:42 -07:00