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Alan Maguire fd2bb30e18 bpftool: JIT limited misreported as negative value on aarch64 
[ Upstream commit 04cb8453a9 ]

On aarch64, "bpftool feature" reports an incorrect BPF JIT limit:

$ sudo /sbin/bpftool feature
Scanning system configuration...
bpf() syscall restricted to privileged users
JIT compiler is enabled
JIT compiler hardening is disabled
JIT compiler kallsyms exports are enabled for root
skipping kernel config, can't open file: No such file or directory
Global memory limit for JIT compiler for unprivileged users is -201326592 bytes

This is because /proc/sys/net/core/bpf_jit_limit reports

$ sudo cat /proc/sys/net/core/bpf_jit_limit
68169519595520

...and an int is assumed in read_procfs().  Change read_procfs()
to return a long to avoid negative value reporting.

Fixes: 7a4522bbef ("tools: bpftool: add probes for /proc/ eBPF parameters")
Reported-by: Nicky Veitch <nicky.veitch@oracle.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20230512113134.58996-1-alan.maguire@oracle.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-07-19 16:35:23 +02:00
arch locking/atomic: arm: fix sync ops 2023-07-19 16:35:19 +02:00
block blk-mq: don't insert passthrough request into sw queue 2023-07-19 16:35:14 +02:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto KEYS: asymmetric: Copy sig and digest in public_key_verify_signature() 2023-06-02 15:36:23 +02:00
Documentation dt-bindings: iio: ad7192: Add mandatory reference voltage source 2023-07-19 16:35:05 +02:00
drivers spi: dw: Round of n_bytes to power of 2 2023-07-19 16:35:23 +02:00
fs pstore/ram: Add check for kstrdup 2023-07-19 16:35:20 +02:00
include bpf: improve precision backtrack logging 2023-07-19 16:35:21 +02:00
init start_kernel: Add __no_stack_protector function attribute 2023-07-19 16:35:05 +02:00
io_uring io_uring/net: use the correct msghdr union member in io_sendmsg_copy_hdr 2023-06-21 07:34:17 -06:00
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: Don't EFAULT for {g,s}setsockopt with wrong optlen 2023-07-19 16:35:23 +02:00
lib maple_tree: fix potential out-of-bounds access in mas_wr_end_piv() 2023-07-01 13:12:38 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm splice: Fix filemap_splice_read() to use the correct inode 2023-07-19 16:35:07 +02:00
net nfc: llcp: fix possible use of uninitialized variable in nfc_llcp_send_connect() 2023-07-19 16:35:23 +02:00
rust Rust changes for v6.4 2023-04-30 11:20:22 -07:00
samples samples/bpf: Fix buffer overflow in tcp_basertt 2023-07-19 16:35:22 +02:00
scripts scripts/tags.sh: Resolve gtags empty index generation 2023-07-05 18:30:30 +01:00
security ima: Fix build warnings 2023-07-19 16:35:20 +02:00
sound ASoC: Fix for v6.4 2023-06-21 15:23:23 +02:00
tools bpftool: JIT limited misreported as negative value on aarch64 2023-07-19 16:35:23 +02:00
usr initramfs: Check negative timestamp to prevent broken cpio archive 2023-04-16 17:37:01 +09:00
virt KVM: Avoid illegal stage2 mapping on invalid memory slot 2023-06-22 15:14:57 -04:00
.clang-format cxl for v6.4 2023-04-30 11:51:51 -07:00
.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: use 'dts' diff driver for *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore linux-kselftest-kunit-6.4-rc1 2023-04-24 12:31:32 -07:00
.mailmap mailmap: add entries for Ben Dooks 2023-06-19 13:19:35 -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 MAINTAINERS: sctp: move Neil to CREDITS 2023-05-12 08:51:32 +01:00
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 Networking fixes for 6.4-rc8, including fixes from ipsec, bpf, 2023-06-22 17:59:51 -07:00
Makefile Linux 6.4.3 2023-07-11 06:31:05 +02:00
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.