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Wander Lairson Costa f9543375d9 bpf: Use raw_spinlock_t in ringbuf 
commit 8b62645b09 upstream.

The function __bpf_ringbuf_reserve is invoked from a tracepoint, which
disables preemption. Using spinlock_t in this context can lead to a
"sleep in atomic" warning in the RT variant. This issue is illustrated
in the example below:

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 556208, name: test_progs
preempt_count: 1, expected: 0
RCU nest depth: 1, expected: 1
INFO: lockdep is turned off.
Preemption disabled at:
[<ffffd33a5c88ea44>] migrate_enable+0xc0/0x39c
CPU: 7 PID: 556208 Comm: test_progs Tainted: G
Hardware name: Qualcomm SA8775P Ride (DT)
Call trace:
 dump_backtrace+0xac/0x130
 show_stack+0x1c/0x30
 dump_stack_lvl+0xac/0xe8
 dump_stack+0x18/0x30
 __might_resched+0x3bc/0x4fc
 rt_spin_lock+0x8c/0x1a4
 __bpf_ringbuf_reserve+0xc4/0x254
 bpf_ringbuf_reserve_dynptr+0x5c/0xdc
 bpf_prog_ac3d15160d62622a_test_read_write+0x104/0x238
 trace_call_bpf+0x238/0x774
 perf_call_bpf_enter.isra.0+0x104/0x194
 perf_syscall_enter+0x2f8/0x510
 trace_sys_enter+0x39c/0x564
 syscall_trace_enter+0x220/0x3c0
 do_el0_svc+0x138/0x1dc
 el0_svc+0x54/0x130
 el0t_64_sync_handler+0x134/0x150
 el0t_64_sync+0x17c/0x180

Switch the spinlock to raw_spinlock_t to avoid this error.

Fixes: 457f44363a ("bpf: Implement BPF ring buffer and verifier support for it")
Reported-by: Brian Grech <bgrech@redhat.com>
Signed-off-by: Wander Lairson Costa <wander.lairson@gmail.com>
Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20240920190700.617253-1-wander@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jianqi Ren <jianqi.ren.cn@windriver.com>
Signed-off-by: He Zhe <zhe.he@windriver.com>
History 2025-03-22 12:50:37 -07:00
arch clockevents/drivers/i8253: Fix stop sequence for timer 0 2025-03-22 12:50:37 -07:00
block block: fix conversion of GPT partition name to 7-bit 2025-03-13 12:58:27 +01:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: ecc - Prevent ecc_digits_from_bytes from reading too many bytes 2025-01-09 13:31:52 +01:00
Documentation sched/isolation: Prevent boot crash when the boot CPU is nohz_full 2025-03-22 12:50:37 -07:00
drivers zram: fix NULL pointer in comp_algorithm_show() 2025-03-22 12:50:37 -07:00
fs hrtimer: Use and report correct timerslack values for realtime tasks 2025-03-22 12:50:37 -07:00
include clockevents/drivers/i8253: Fix stop sequence for timer 0 2025-03-22 12:50:37 -07:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-09 10:32:46 +01:00
io_uring io_uring/net: save msg_control for compat 2025-03-07 16:45:43 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-09 10:32:54 +01:00
kernel bpf: Use raw_spinlock_t in ringbuf 2025-03-22 12:50:37 -07:00
lib rcuref: Plug slowpath race in rcuref_put() 2025-03-07 16:45:47 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: hugetlb: Add huge page size param to huge_ptep_get_and_clear() 2025-03-13 12:58:38 +01:00
net pfifo_tail_enqueue: Drop new packet when sch->limit == 0 2025-03-13 12:58:40 +01:00
rust rust: init: use explicit ABI to clean warning in future compilers 2025-02-17 09:40:27 +01:00
samples samples/landlock: Fix possible NULL dereference in parse_path() 2025-02-08 09:51:57 +01:00
scripts scripts/gdb: fix aarch64 userspace detection in get_current_task 2025-02-17 09:40:39 +01:00
security ima: Reset IMA_NONACTION_RULE_FLAGS after post_setattr 2025-03-13 12:58:40 +01:00
sound ALSA: hda: realtek: fix incorrect IS_REACHABLE() usage 2025-03-13 12:58:38 +01:00
tools rtla/timerlat_top: Set OSNOISE_WORKLOAD for kernel threads 2025-03-07 16:45:49 +01:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 12:58:38 +01:00
virt KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock 2024-10-04 16:29:47 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-04 16:29:44 +02:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.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 USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
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 membarrier: riscv: Add full memory barrier in switch_mm() 2024-09-12 11:11:45 +02:00
Makefile Linux 6.6.83 2025-03-13 12:58:41 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 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.