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acf1c3d68e
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Alexei Starovoitov acf1c3d68e bpf: Fix race between btf_put and btf_idr walk. 
Florian and Eduard reported hard dead lock:
[   58.433327]  _raw_spin_lock_irqsave+0x40/0x50
[   58.433334]  btf_put+0x43/0x90
[   58.433338]  bpf_find_btf_id+0x157/0x240
[   58.433353]  btf_parse_fields+0x921/0x11c0

This happens since btf->refcount can be 1 at the time of btf_put() and
btf_put() will call btf_free_id() which will try to grab btf_idr_lock
and will dead lock.
Avoid the issue by doing btf_put() without locking.

Fixes: 3d78417b60 ("bpf: Add bpf_btf_find_by_name_kind() helper.")
Fixes: 1e89106da2 ("bpf: Add bpf_core_add_cands() and wire it into bpf_core_apply_relo_insn().")
Reported-by: Florian Westphal <fw@strlen.de>
Reported-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20230421014901.70908-1-alexei.starovoitov@gmail.com
2023-04-21 16:27:56 +02:00
arch bpf: Support 64-bit pointers to kfuncs 2023-04-13 21:36:41 -07:00
block block: don't set GD_NEED_PART_SCAN if scan partition failed 2023-04-06 20:41:53 -06:00
certs Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
crypto asymmetric_keys: log on fatal failures in PE/pkcs7 2023-03-21 16:23:56 +00:00
Documentation bpf,docs: Remove KF_KPTR_GET from documentation 2023-04-16 08:51:24 -07:00
drivers bpf-next-for-netdev 2023-04-13 16:43:38 -07:00
fs Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-04-13 16:04:28 -07:00
include bpf: Set skb redirect and from_ingress info in __bpf_tx_skb 2023-04-17 13:17:41 -07:00
init bootconfig: Change message if no bootconfig with CONFIG_BOOT_CONFIG_FORCE=y 2023-03-22 22:21:43 +09:00
io_uring Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-04-13 16:04:28 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel bpf: Fix race between btf_put and btf_idr walk. 2023-04-21 16:27:56 +02:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-04-13 16:04:28 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm bpf-next-for-netdev 2023-04-13 16:43:38 -07:00
net bpf: Set skb redirect and from_ingress info in __bpf_tx_skb 2023-04-17 13:17:41 -07:00
rust Rust fixes for 6.3-rc1 2023-03-03 14:51:15 -08:00
samples samples/bpf: sampleip: Replace PAGE_OFFSET with _text address 2023-04-13 21:57:11 -07:00
scripts bpf-next-for-netdev 2023-04-13 16:43:38 -07:00
security Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-03-24 10:10:20 -07:00
sound ALSA: hda/hdmi: Preserve the previous PCM device upon re-enablement 2023-04-01 18:05:48 +02:00
tools selftests/bpf: populate map_array_ro map for verifier_array_access test 2023-04-20 16:49:16 -07:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: PPC: Make KVM_CAP_IRQFD_RESAMPLE platform dependent 2023-03-31 11:19:05 -04:00
.clang-format cpumask: re-introduce constant-sized cpumask optimizations 2023-03-05 14:30:34 -08:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore kbuild: rpm-pkg: move source components to rpmbuild/SOURCES 2023-03-16 22:45:56 +09:00
.mailmap mailmap: add an entry for Leonard Crestez 2023-03-28 15:24:32 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS There is no particular theme here - mainly quick hits all over the tree. 2023-02-23 17:55:40 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-04-13 16:04:28 -07:00
Makefile Linux 6.3-rc6 2023-04-09 11:15:57 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.