Andrii Nakryiko 47a71c1f9a bpf: Add log_true_size output field to return necessary log buffer size ... Add output-only log_true_size and btf_log_true_size field to BPF_PROG_LOAD and BPF_BTF_LOAD commands, respectively. It will return the size of log buffer necessary to fit in all the log contents at specified log_level. This is very useful for BPF loader libraries like libbpf to be able to size log buffer correctly, but could be used by users directly, if necessary, as well. This patch plumbs all this through the code, taking into account actual bpf_attr size provided by user to determine if these new fields are expected by users. And if they are, set them from kernel on return. We refactory btf_parse() function to accommodate this, moving attr and uattr handling inside it. The rest is very straightforward code, which is split from the logging accounting changes in the previous patch to make it simpler to review logic vs UAPI changes. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Lorenz Bauer <lmb@isovalent.com> Link: https://lore.kernel.org/bpf/20230406234205.323208-13-andrii@kernel.org		2023-04-11 18:05:43 +02:00
..
preload	bpf: iterators: Split iterators.lskel.h into little- and big- endian versions	2023-01-28 12:45:15 -08:00
arraymap.c	bpf: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
bloom_filter.c	bpf: compute hashes in bloom filter similar to hashmap	2023-04-02 08:44:49 -07:00
bpf_cgrp_storage.c	bpf: Teach verifier that certain helpers accept NULL pointer.	2023-04-04 16:57:16 -07:00
bpf_inode_storage.c	bpf: Teach verifier that certain helpers accept NULL pointer.	2023-04-04 16:57:16 -07:00
bpf_iter.c	bpf: implement numbers iterator	2023-03-08 16:19:51 -08:00
bpf_local_storage.c	bpf: Use bpf_mem_cache_alloc/free for bpf_local_storage	2023-03-25 19:52:52 -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 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: Check IS_ERR for the bpf_map_get() return value	2023-03-24 12:40:47 -07:00
bpf_task_storage.c	bpf: Teach verifier that certain helpers accept NULL pointer.	2023-04-04 16:57:16 -07:00
btf.c	bpf: Add log_true_size output field to return necessary log buffer size	2023-04-11 18:05:43 +02:00
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: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
cpumask.c	bpf: Treat KF_RELEASE kfuncs as KF_TRUSTED_ARGS	2023-03-25 16:56:22 -07:00
devmap.c	bpf: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
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: optimize hashmap lookups when key_size is divisible by 4	2023-04-01 15:08:19 -07:00
helpers.c	bpf: ensure all memory is initialized in bpf_get_current_comm	2023-04-06 18:48:24 -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: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
log.c	bpf: Keep track of total log content size in both fixed and rolling modes	2023-04-11 18:05:43 +02:00
lpm_trie.c	bpf: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
Makefile	bpf: Split off basic BPF verifier log into separate file	2023-04-11 18:05:42 +02:00
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
map_iter.c	bpf: Introduce MEM_RDONLY flag	2021-12-18 13:27:41 -08:00
memalloc.c	bpf: Add a few bpf mem allocator functions	2023-03-25 19:52:51 -07:00
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
prog_iter.c
queue_stack_maps.c	bpf: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
reuseport_array.c	bpf: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
ringbuf.c	bpf: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
stackmap.c	bpf: return long from bpf_map_ops funcs	2023-03-22 15:11:30 -07:00
syscall.c	bpf: Add log_true_size output field to return necessary log buffer size	2023-04-11 18:05:43 +02:00
sysfs_btf.c
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: Add log_true_size output field to return necessary log buffer size	2023-04-11 18:05:43 +02:00