iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/kernel/bpf
History
Cong Wang 91cff53136 bpf: Fix a potential use-after-free in bpf_link_free() 
[ Upstream commit 2884dc7d08d98a89d8d65121524bb7533183a63a ]

After commit 1a80dbcb2dba, bpf_link can be freed by
link->ops->dealloc_deferred, but the code still tests and uses
link->ops->dealloc afterward, which leads to a use-after-free as
reported by syzbot. Actually, one of them should be sufficient, so
just call one of them instead of both. Also add a WARN_ON() in case
of any problematic implementation.

Fixes: 1a80dbcb2dba ("bpf: support deferring bpf_link dealloc to after RCU grace period")
Reported-by: syzbot+1989ee16d94720836244@syzkaller.appspotmail.com
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20240602182703.207276-1-xiyou.wangcong@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-06-21 14:38:15 +02:00
..
preload
bpf: make preloaded map iterators to display map elements count
2023-07-06 12:42:25 -07:00
arraymap.c
bpf: Set need_defer as false when clearing fd array during map free
2024-02-05 20:14:20 +00:00
bloom_filter.c
bpf: Check bloom filter map value size
2024-05-17 12:02:11 +02:00
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
Networking changes for 6.4.
2023-04-26 16:07:23 -07:00
bpf_iter.c
bpf: implement numbers iterator
2023-03-08 16:19:51 -08:00
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: Address KCSAN report on bpf_lru_list
2023-05-12 12:01:03 -07:00
bpf_lru_list.h
bpf: lru: Remove unused declaration bpf_lru_promote()
2023-08-08 17:21:42 -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: Support default .validate() and .update() behavior for struct_ops links
2023-08-14 22:23:39 -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 bpf_sock_addr_set_sun_path() to allow writing unix sockaddr from bpf
2024-01-31 16:19:04 -08:00
cgroup_iter.c
cgroup: bpf: use cgroup_lock()/cgroup_unlock() wrappers
2023-03-17 12:07:13 -10:00
cgroup.c
bpf: Propagate modified uaddrlen from cgroup sockaddr programs
2024-01-31 16:19:04 -08:00
core.c
bpf: Optimize the free of inner map
2024-06-21 14:38:15 +02:00
cpumap.c
bpf: report RCU QS in cpumap kthread
2024-03-26 18:20:12 -04:00
cpumask.c
bpf: Convert bpf_cpumask to bpf_mem_cache_free_rcu.
2023-07-12 23:45:23 +02:00
devmap.c
bpf: Fix DEVMAP_HASH overflow check on 32-bit arches
2024-03-26 18:19:39 -04:00
disasm.c
bpf: change bpf_alu_sign_string and bpf_movsx_string to static
2023-08-04 16:15:50 -07:00
disasm.h
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: Fix hashtab overflow check on 32-bit arches
2024-03-26 18:19:39 -04:00
helpers.c
bpf: Mark bpf_spin_{lock,unlock}() helpers with notrace correctly
2024-03-26 18:19:29 -04:00
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
bpf: Add bpf_link iterator
2022-05-10 11:20:45 -07:00
local_storage.c
cgroup changes for v6.4-rc1
2023-04-29 10:05:22 -07:00
log.c
bpf: drop unnecessary user-triggerable WARN_ONCE in verifierl log
2023-05-16 22:34:50 -07:00
lpm_trie.c
bpf, lpm: Fix check prefixlen before walking trie
2024-01-25 15:35:19 -08:00
Makefile
bpf: Add fd-based tcx multi-prog infra with link support
2023-07-19 10:07:27 -07:00
map_in_map.c
bpf: Optimize the free of inner map
2024-06-21 14:38:15 +02:00
map_in_map.h
bpf: Add map and need_defer parameters to .map_fd_put_ptr()
2024-01-25 15:35:22 -08:00
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: Use c->unit_size to select target cache during free
2024-01-25 15:35:28 -08:00
mmap_unlock_work.h
bpf: Introduce helper bpf_find_vma
2021-11-07 11:54:51 -08:00
mprog.c
bpf: Handle bpf_mprog_query with NULL entry
2023-10-06 17:11:20 -07:00
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: Avoid dummy bpf_offload_netdev in __bpf_prog_dev_bound_init
2023-09-11 22:06:06 -07:00
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: Avoid deadlock when using queue and stack maps from NMI
2023-09-11 19:04:49 -07:00
reuseport_array.c
bpf: Centralize permissions checks for all BPF map types
2023-06-19 14:04:04 +02:00
ringbuf.c
bpf: Remove unnecessary ring buffer size check
2023-07-05 14:09:45 +02:00
stackmap.c
bpf: Fix stackmap overflow check on 32-bit arches
2024-03-26 18:19:39 -04:00
syscall.c
bpf: Fix a potential use-after-free in bpf_link_free()
2024-06-21 14:38:15 +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
tcx.c
bpf: Handle bpf_mprog_query with NULL entry
2023-10-06 17:11:20 -07:00
tnum.c
…
trampoline.c
bpf, x64: Fix tailcall infinite loop
2023-11-20 11:58:55 +01:00
verifier.c
bpf: Optimize the free of inner map
2024-06-21 14:38:15 +02:00