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linux-next/kernel/bpf
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Kumar Kartikeya Dwivedi d1a374a1ae bpf: Limit maximum modifier chain length in btf_check_type_tags 
On processing a module BTF of module built for an older kernel, we might
sometimes find that some type points to itself forming a loop. If such a
type is a modifier, btf_check_type_tags's while loop following modifier
chain will be caught in an infinite loop.

Fix this by defining a maximum chain length and bailing out if we spin
any longer than that.

Fixes: eb596b090558 ("bpf: Ensure type tags precede modifiers in BTF")
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220615042151.2266537-1-memxor@gmail.com
2022-06-15 19:32:12 +02:00
..
preload
bpf: Remove redundant slash
2022-03-07 22:19:32 -08:00
arraymap.c
bpf: add bpf_map_lookup_percpu_elem for percpu map
2022-05-11 18:16:54 -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: Remove redundant assignment to meta.seq in __task_seq_show()
2022-04-11 21:14:34 +02:00
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, x86: Attach a cookie to fentry/fexit/fmod_ret/lsm.
2022-05-10 21:58:31 -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, x86: Generate trampolines from bpf_tramp_links
2022-05-10 17:50:40 -07:00
bpf_task_storage.c
bpf: Compute map_btf_id during build time
2022-04-26 11:35:21 -07:00
btf.c
bpf: Limit maximum modifier chain length in btf_check_type_tags
2022-06-15 19:32:12 +02:00
cgroup.c
bpf: Use bpf_prog_run_array_cg_flags everywhere
2022-04-25 17:03:57 -07:00
core.c
bpf: Fix probe read error in ___bpf_prog_run()
2022-05-28 01:09:18 +02:00
cpumap.c
bpf: Compute map_btf_id during build time
2022-04-26 11:35:21 -07:00
devmap.c
bpf: Compute map_btf_id during build time
2022-04-26 11:35:21 -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: Remove bpf_image tree
2020-03-13 12:49:52 -07:00
hashtab.c
bpf: add bpf_map_lookup_percpu_elem for percpu map
2022-05-11 18:16:54 -07:00
helpers.c
bpf: Add dynptr data slices
2022-05-23 14:31:28 -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: Compute map_btf_id during build time
2022-04-26 11:35:21 -07:00
lpm_trie.c
bpf: Compute map_btf_id during build time
2022-04-26 11:35:21 -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: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI
2020-10-06 00:04:11 +02:00
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: refine kernel.unprivileged_bpf_disabled behaviour
2022-05-20 19:48:29 -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: Fix potential array overflow in bpf_trampoline_get_progs()
2022-05-11 21:24:20 -07:00
verifier.c
bpf: Add dynptr data slices
2022-05-23 14:31:28 -07:00