linux

mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00

No description

C 96.8%
Assembly 0.9%
Rust 0.7%
Shell 0.6%
Python 0.5%
Other 0.3%

Find a file

Jiayuan Chen 3d25fa2d7f bpf, sockmap: Fix panic when calling skb_linearize [ Upstream commit `5ca2e29f68` ] The panic can be reproduced by executing the command: ./bench sockmap -c 2 -p 1 -a --rx-verdict-ingress --rx-strp 100000 Then a kernel panic was captured: ''' [ 657.460555] kernel BUG at net/core/skbuff.c:2178! [ 657.462680] Tainted: [W]=WARN [ 657.463287] Workqueue: events sk_psock_backlog ... [ 657.469610] <TASK> [ 657.469738] ? die+0x36/0x90 [ 657.469916] ? do_trap+0x1d0/0x270 [ 657.470118] ? pskb_expand_head+0x612/0xf40 [ 657.470376] ? pskb_expand_head+0x612/0xf40 [ 657.470620] ? do_error_trap+0xa3/0x170 [ 657.470846] ? pskb_expand_head+0x612/0xf40 [ 657.471092] ? handle_invalid_op+0x2c/0x40 [ 657.471335] ? pskb_expand_head+0x612/0xf40 [ 657.471579] ? exc_invalid_op+0x2d/0x40 [ 657.471805] ? asm_exc_invalid_op+0x1a/0x20 [ 657.472052] ? pskb_expand_head+0xd1/0xf40 [ 657.472292] ? pskb_expand_head+0x612/0xf40 [ 657.472540] ? lock_acquire+0x18f/0x4e0 [ 657.472766] ? find_held_lock+0x2d/0x110 [ 657.472999] ? __pfx_pskb_expand_head+0x10/0x10 [ 657.473263] ? __kmalloc_cache_noprof+0x5b/0x470 [ 657.473537] ? __pfx___lock_release.isra.0+0x10/0x10 [ 657.473826] __pskb_pull_tail+0xfd/0x1d20 [ 657.474062] ? __kasan_slab_alloc+0x4e/0x90 [ 657.474707] sk_psock_skb_ingress_enqueue+0x3bf/0x510 [ 657.475392] ? __kasan_kmalloc+0xaa/0xb0 [ 657.476010] sk_psock_backlog+0x5cf/0xd70 [ 657.476637] process_one_work+0x858/0x1a20 ''' The panic originates from the assertion BUG_ON(skb_shared(skb)) in skb_linearize(). A previous commit(see Fixes tag) introduced skb_get() to avoid race conditions between skb operations in the backlog and skb release in the recvmsg path. However, this caused the panic to always occur when skb_linearize is executed. The "--rx-strp 100000" parameter forces the RX path to use the strparser module which aggregates data until it reaches 100KB before calling sockmap logic. The 100KB payload exceeds MAX_MSG_FRAGS, triggering skb_linearize. To fix this issue, just move skb_get into sk_psock_skb_ingress_enqueue. ''' sk_psock_backlog: sk_psock_handle_skb skb_get(skb) <== we move it into 'sk_psock_skb_ingress_enqueue' sk_psock_skb_ingress____________ ↓ \| \| → sk_psock_skb_ingress_self \| sk_psock_skb_ingress_enqueue sk_psock_verdict_apply_________________↑ skb_linearize ''' Note that for verdict_apply path, the skb_get operation is unnecessary so we add 'take_ref' param to control it's behavior. Fixes: `a454d84ee2` ("bpf, sockmap: Fix skb refcnt race after locking changes") Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev> Link: https://lore.kernel.org/r/20250407142234.47591-4-jiayuan.chen@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-06-19 15:31:41 +02:00
arch	arm64/fpsimd: Do not discard modified SVE state	2025-06-19 15:31:38 +02:00
block	block: fix adding folio to bio	2025-06-10 07:12:59 -04:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: api - Redo lookup on EEXIST	2025-06-19 15:31:30 +02:00
Documentation	dt-bindings: phy: imx8mq-usb: fix fsl,phy-tx-vboost-level-microvolt property	2025-06-10 07:13:00 -04:00
drivers	IB/cm: use rwlock for MAD agent lock	2025-06-19 15:31:40 +02:00
fs	fs/ntfs3: Add missing direct_IO in ntfs_aops_cmpr	2025-06-19 15:31:36 +02:00
include	overflow: Fix direct struct member initialization in _DEFINE_FLEX()	2025-06-19 15:31:38 +02:00
init	rust: clean Rust 1.88.0's `unnecessary_transmutes` lint	2025-05-18 08:24:51 +02:00
io_uring	io_uring: fix overflow resched cqe reordering	2025-05-29 11:03:17 +02:00
ipc	ipc: fix memleak if msg_init_ns failed in create_ipc_ns	2024-12-05 14:03:02 +01:00
kernel	bpf: Check link_create.flags parameter for multi_kprobe	2025-06-19 15:31:40 +02:00
lib	kunit/usercopy: Disable u64 test on 32-bit SPARC	2025-06-19 15:31:36 +02:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	mm: vmalloc: only zero-init on vrealloc shrink	2025-05-29 11:03:23 +02:00
net	bpf, sockmap: Fix panic when calling skb_linearize	2025-06-19 15:31:41 +02:00
rust	rust: clean Rust 1.88.0's `clippy::uninlined_format_args` lint	2025-05-18 08:24:57 +02:00
samples	samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora	2025-05-29 11:02:01 +02:00
scripts	kbuild: Properly disable -Wunterminated-string-initialization for clang	2025-05-29 11:03:25 +02:00
security	smack: Revert "smackfs: Added check catlen"	2025-05-29 11:02:48 +02:00
sound	ALSA: core: fix up bus match const issues.	2025-06-19 15:31:33 +02:00
tools	selftests/bpf: Fix bpf_nf selftest failure	2025-06-19 15:31:40 +02:00
usr	kbuild: hdrcheck: fix cross build with clang	2025-03-13 13:02:18 +01:00
virt	KVM: Add member to struct kvm_gfn_range to indicate private/shared	2025-05-22 14:29:36 +02:00
.clang-format	clang-format: Update with v6.11-rc1's `for_each` macro list	2024-08-02 13:20:31 +02:00
.clippy.toml	rust: clean Rust 1.88.0's warning about `clippy::disallowed_macros` configuration	2025-05-18 08:24:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	Add Jeff Kirsher to .get_maintainer.ignore	2024-03-08 11:36:54 +00:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	rust: introduce `.clippy.toml`	2025-03-13 13:01:42 +01:00
.mailmap	mailmap: add entry for Thorsten Blum	2024-11-07 14:14:59 -08:00
.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	MAINTAINERS: Remove self from DSA entry	2024-11-03 12:52:38 -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	MAINTAINERS: Update Alexey Makhalov's email address	2025-05-22 14:29:46 +02:00
Makefile	Linux 6.12.33	2025-06-10 07:13:00 -04:00
README	README: Fix spelling	2024-03-18 03:36:32 -06:00

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 reStructuredText 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.