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Yonghong Song 1b1f56cc0e bpf: Fix a possible task gone issue with bpf_send_signal[_thread]() helpers 
[ Upstream commit bdb7fdb0ac ]

In current bpf_send_signal() and bpf_send_signal_thread() helper
implementation, irq_work is used to handle nmi context. Hao Sun
reported in [1] that the current task at the entry of the helper
might be gone during irq_work callback processing. To fix the issue,
a reference is acquired for the current task before enqueuing into
the irq_work so that the queued task is still available during
irq_work callback processing.

  [1] https://lore.kernel.org/bpf/20230109074425.12556-1-sunhao.th@gmail.com/

Fixes: 8b401f9ed2 ("bpf: implement bpf_send_signal() helper")
Tested-by: Hao Sun <sunhao.th@gmail.com>
Reported-by: Hao Sun <sunhao.th@gmail.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20230118204815.3331855-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-15 17:22:10 +01:00
arch powerpc/imc-pmu: Revert nest_init_lock to being a mutex 2023-02-15 17:22:10 +01:00
block blk-cgroup: fix missing pd_online_fn() while activating policy 2023-02-06 07:56:15 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:13:17 +02:00
crypto crypto: tcrypt - Fix multibuffer skcipher speed test mem leak 2023-01-14 10:15:50 +01:00
Documentation docs: Fix path paste-o for /sys/kernel/warn_count 2023-02-01 08:23:21 +01:00
drivers bus: sunxi-rsb: Fix error handling in sunxi_rsb_init() 2023-02-15 17:22:10 +01:00
fs nfsd: Ensure knfsd shuts down when the "nfsd" pseudofs is unmounted 2023-02-01 08:23:26 +01:00
include netfilter: conntrack: unify established states for SCTP paths 2023-02-01 08:23:27 +01:00
init init/Kconfig: fix CC_HAS_ASM_GOTO_TIED_OUTPUT test with dash 2022-12-02 17:40:03 +01:00
io_uring io_uring/rw: remove leftover debug statement 2023-01-24 07:20:02 +01:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:24:00 +01:00
kernel bpf: Fix a possible task gone issue with bpf_send_signal[_thread]() helpers 2023-02-15 17:22:10 +01:00
lib netlink: prevent potential spectre v1 gadgets 2023-02-01 08:23:23 +01:00
LICENSES
mm panic: Consolidate open-coded panic_on_warn checks 2023-02-01 08:23:20 +01:00
net net: fix NULL pointer in skb_segment_list 2023-02-06 07:56:16 +01:00
samples samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe() 2023-01-14 10:16:01 +01:00
scripts ftrace/scripts: Update the instructions for ftrace-bisect.sh 2023-02-01 08:23:22 +01:00
security tomoyo: fix broken dependency on *.conf.default 2023-02-01 08:23:10 +01:00
sound ASoC: fsl-asoc-card: Fix naming of AC'97 CODEC widgets 2023-02-01 08:23:17 +01:00
tools Revert "selftests/ftrace: Update synthetic event syntax errors" 2023-02-01 08:23:26 +01:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:25:48 +01:00
virt kvm: Add support for arch compat vm ioctls 2022-10-30 09:41:15 +01:00
.clang-format
.cocciconfig
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.gitignore kbuild: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
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COPYING
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Kbuild
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MAINTAINERS futex: Move to kernel/futex/ 2023-01-14 10:15:20 +01:00
Makefile Linux 5.10.167 2023-02-06 07:56:16 +01:00
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.