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Jiri Olsa d099f594ad kallsyms: Disable preemption for find_kallsyms_symbol_value 
Artem reported suspicious RCU usage [1]. The reason is that verifier
calls find_kallsyms_symbol_value with preemption enabled which will
trigger suspicious RCU usage warning in rcu_dereference_sched call.

Disabling preemption in find_kallsyms_symbol_value and adding
__find_kallsyms_symbol_value function.

Fixes: 31bf1dbccf ("bpf: Fix attaching fentry/fexit/fmod_ret/lsm to modules")
Reported-by: Artem Savkov <asavkov@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Artem Savkov <asavkov@redhat.com>
Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/bpf/20230403220254.2191240-1-jolsa@kernel.org

[1] https://lore.kernel.org/bpf/ZBrPMkv8YVRiWwCR@samus.usersys.redhat.com/
2023-04-04 17:11:59 -07:00
arch bpf-next-for-netdev 2023-03-06 20:36:39 -08:00
block Driver core changes for 6.3-rc1 2023-02-24 12:58:55 -08:00
certs Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
crypto Networking changes for 6.3. 2023-02-21 18:24:12 -08:00
Documentation bpf, docs: Add docs on extended 64-bit immediate instructions 2023-04-02 17:02:54 -07:00
drivers bpf: Remove now-unnecessary NULL checks for KF_RELEASE kfuncs 2023-03-25 16:56:22 -07:00
fs ARM: SoC drivers for 6.3 2023-02-27 10:04:49 -08:00
include bpf: Refactor btf_nested_type_is_trusted(). 2023-04-04 16:57:14 -07:00
init Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
io_uring net: reclaim skb->scm_io_uring bit 2023-03-08 13:21:47 +00:00
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 kallsyms: Disable preemption for find_kallsyms_symbol_value 2023-04-04 17:11:59 -07:00
lib Kernel concurrency sanitizer (KCSAN) updates for v6.3 2023-02-25 13:02:20 -08:00
LICENSES
mm memblock: small optimizations 2023-02-27 09:34:53 -08:00
net bpf: Teach verifier that certain helpers accept NULL pointer. 2023-04-04 16:57:16 -07:00
rust Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
samples bpf: use canonical ftrace path 2023-03-13 21:51:30 -07:00
scripts Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
security powerpc updates for 6.3 2023-02-25 11:00:06 -08:00
sound ARM: SoC drivers for 6.3 2023-02-27 10:04:49 -08:00
tools selftests/bpf: Add tracing tests for walking skb and req. 2023-04-04 16:57:27 -07:00
usr
virt KVM/riscv changes for 6.3 2023-02-15 12:33:28 -05:00
.clang-format media: subdev: Add for_each_active_route() macro 2023-01-22 09:35:57 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: use 'dts' diff driver for *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore .gitignore: ignore *.cover and *.mbx 2023-02-05 18:51:22 +09:00
.mailmap 12 hotfixes, mostly against mm/. Five of these fixes are cc:stable. 2023-02-13 14:09:20 -08:00
.rustfmt.toml
COPYING
CREDITS There is no particular theme here - mainly quick hits all over the tree. 2023-02-23 17:55:40 -08:00
Kbuild
Kconfig
MAINTAINERS ARM: SoC fixes for 6.3, part 1 2023-02-27 10:09:40 -08:00
Makefile Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
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.