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linux/kernel/bpf
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Alexei Starovoitov 58aa2afbb1 bpf: Allow ld_imm64 instruction to point to kfunc. 
Allow ld_imm64 insn with BPF_PSEUDO_BTF_ID to hold the address of kfunc. The
ld_imm64 pointing to a valid kfunc will be seen as non-null PTR_TO_MEM by
is_branch_taken() logic of the verifier, while libbpf will resolve address to
unknown kfunc as ld_imm64 reg, 0 which will also be recognized by
is_branch_taken() and the verifier will proceed dead code elimination. BPF
programs can use this logic to detect at load time whether kfunc is present in
the kernel with bpf_ksym_exists() macro that is introduced in the next patches.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20230317201920.62030-2-alexei.starovoitov@gmail.com
2023-03-17 15:44:26 -07:00
..
preload
bpf: iterators: Split iterators.lskel.h into little- and big- endian versions
2023-01-28 12:45:15 -08:00
arraymap.c
bpf: arraymap memory usage
2023-03-07 09:33:42 -08:00
bloom_filter.c
bpf: bloom_filter memory usage
2023-03-07 09:33:42 -08:00
bpf_cgrp_storage.c
bpf: Repurpose use_trace_rcu to reuse_now in bpf_local_storage
2023-03-10 11:05:28 -08:00
bpf_inode_storage.c
bpf: Repurpose use_trace_rcu to reuse_now in bpf_local_storage
2023-03-10 11:05:28 -08:00
bpf_iter.c
bpf: implement numbers iterator
2023-03-08 16:19:51 -08:00
bpf_local_storage.c
bpf: Add bpf_local_storage_free()
2023-03-10 11:05:29 -08:00
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 the kernel crash caused by bpf_setsockopt().
2023-01-26 23:26:40 -08:00
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: bpf_struct_ops memory usage
2023-03-07 09:33:43 -08:00
bpf_task_storage.c
bpf: Repurpose use_trace_rcu to reuse_now in bpf_local_storage
2023-03-10 11:05:28 -08:00
btf.c
bpf: Disable migration when freeing stashed local kptr using obj drop
2023-03-13 16:55:04 -07:00
cgroup_iter.c
bpf: Pin the start cgroup in cgroup_iter_seq_init()
2022-11-21 17:40:42 +01:00
cgroup.c
bpf: allow ctx writes using BPF_ST_MEM instruction
2023-03-03 21:41:46 -08:00
core.c
bpf: add missing header file include
2023-02-22 09:52:32 -08:00
cpumap.c
bpf: cpumap memory usage
2023-03-07 09:33:42 -08:00
cpumask.c
bpf: Remove bpf_cpumask_kptr_get() kfunc
2023-03-16 12:28:30 -07:00
devmap.c
bpf: devmap memory usage
2023-03-07 09:33:42 -08:00
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: Synchronize dispatcher update with bpf_dispatcher_xdp_func
2022-12-14 12:02:14 -08:00
hashtab.c
bpf: hashtab memory usage
2023-03-07 09:33:42 -08:00
helpers.c
bpf: Fix bpf_strncmp proto.
2023-03-13 23:08:21 -07:00
inode.c
fs: port inode_init_owner() to mnt_idmap
2023-01-19 09:24:28 +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: local_storage memory usage
2023-03-07 09:33:43 -08:00
lpm_trie.c
bpf: lpm_trie memory usage
2023-03-07 09:33:42 -08:00
Makefile
bpf: Enable cpumasks to be queried and used as kptrs
2023-01-25 07:57:49 -08:00
map_in_map.c
bpf: Add comments for map BTF matching requirement for bpf_list_head
2022-11-17 19:22:14 -08:00
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
memalloc.c
bpf: Zeroing allocated object from slab in bpf memory allocator
2023-02-15 15:40:06 -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 map memory usage
2023-03-07 09:33:43 -08:00
percpu_freelist.c
bpf: Initialize same number of free nodes for each pcpu_freelist
2022-11-11 12:05:14 -08:00
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: queue_stack_maps memory usage
2023-03-07 09:33:42 -08:00
reuseport_array.c
bpf: reuseport_array memory usage
2023-03-07 09:33:42 -08:00
ringbuf.c
bpf: ringbuf memory usage
2023-03-07 09:33:42 -08:00
stackmap.c
bpf: stackmap memory usage
2023-03-07 09:33:42 -08:00
syscall.c
bpf: Fix attaching fentry/fexit/fmod_ret/lsm to modules
2023-03-15 18:38:21 -07:00
sysfs_btf.c
bpf: Load and verify kernel module BTFs
2020-11-10 15:25:53 -08:00
task_iter.c
bpf: keep a reference to the mm, in case the task is dead.
2022-12-28 14:11:48 -08:00
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: Fix attaching fentry/fexit/fmod_ret/lsm to modules
2023-03-15 18:38:21 -07:00
verifier.c
bpf: Allow ld_imm64 instruction to point to kfunc.
2023-03-17 15:44:26 -07:00