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Kees Cook fa203531aa kernfs: Convert kernfs_path_from_node_locked() from strlcpy() to strscpy() [ Upstream commit `ff6d413b0b` ] One of the last remaining users of strlcpy() in the kernel is kernfs_path_from_node_locked(), which passes back the problematic "length we _would_ have copied" return value to indicate truncation. Convert the chain of all callers to use the negative return value (some of which already doing this explicitly). All callers were already also checking for negative return values, so the risk to missed checks looks very low. In this analysis, it was found that cgroup1_release_agent() actually didn't handle the "too large" condition, so this is technically also a bug fix. :) Here's the chain of callers, and resolution identifying each one as now handling the correct return value: kernfs_path_from_node_locked() kernfs_path_from_node() pr_cont_kernfs_path() returns void kernfs_path() sysfs_warn_dup() return value ignored cgroup_path() blkg_path() bfq_bic_update_cgroup() return value ignored TRACE_IOCG_PATH() return value ignored TRACE_CGROUP_PATH() return value ignored perf_event_cgroup() return value ignored task_group_path() return value ignored damon_sysfs_memcg_path_eq() return value ignored get_mm_memcg_path() return value ignored lru_gen_seq_show() return value ignored cgroup_path_from_kernfs_id() return value ignored cgroup_show_path() already converted "too large" error to negative value cgroup_path_ns_locked() cgroup_path_ns() bpf_iter_cgroup_show_fdinfo() return value ignored cgroup1_release_agent() wasn't checking "too large" error proc_cgroup_show() already converted "too large" to negative value Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Tejun Heo <tj@kernel.org> Cc: Zefan Li <lizefan.x@bytedance.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Waiman Long <longman@redhat.com> Cc: <cgroups@vger.kernel.org> Co-developed-by: Azeem Shaikh <azeemshaikh38@gmail.com> Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com> Link: https://lore.kernel.org/r/20231116192127.1558276-3-keescook@chromium.org Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20231212211741.164376-3-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Stable-dep-of: `1be59c97c8` ("cgroup/cpuset: Prevent UAF in proc_cpuset_show()") Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-08-03 08:48:54 +02:00
arch	x86/platform/iosf_mbi: Convert PCIBIOS_* return codes to errnos	2024-08-03 08:48:54 +02:00
block	block: initialize integrity buffer to zero before writing it to media	2024-08-03 08:48:53 +02:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: aead,cipher - zeroize key buffer after use	2024-07-11 12:47:05 +02:00
Documentation	cifs: fix setting SecurityFlags to true	2024-07-18 13:18:37 +02:00
drivers	platform/chrome: cros_ec_debugfs: fix wrong EC message version	2024-08-03 08:48:52 +02:00
fs	kernfs: Convert kernfs_path_from_node_locked() from strlcpy() to strscpy()	2024-08-03 08:48:54 +02:00
include	cachefiles: fix slab-use-after-free in fscache_withdraw_volume()	2024-07-25 09:49:20 +02:00
init	smp: Provide 'setup_max_cpus' definition on UP too	2024-06-16 13:41:42 +02:00
io_uring	io_uring/sqpoll: work around a potential audit memory leak	2024-06-27 13:46:14 +02:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	kernfs: Convert kernfs_path_from_node_locked() from strlcpy() to strscpy()	2024-08-03 08:48:54 +02:00
lib	kunit: Fix timeout message	2024-07-11 12:47:08 +02:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm/damon/core: merge regions aggressively when max_nr_regions is unmet	2024-07-25 09:49:07 +02:00
net	wifi: mac80211: disable softirqs for queued frame handling	2024-07-25 09:49:20 +02:00
rust	rust: macros: fix soundness issue in `module!` macro	2024-05-17 11:56:17 +02:00
samples	work around gcc bugs with 'asm goto' with outputs	2024-02-23 09:12:28 +01:00
scripts	kconfig: remove wrong expr_trans_bool()	2024-07-25 09:49:11 +02:00
security	ima: Avoid blocking in RCU read-side critical section	2024-07-11 12:47:16 +02:00
sound	ALSA: pcm_dmaengine: Don't synchronize DMA channel when DMA is paused	2024-07-27 11:32:19 +02:00
tools	selftests/vDSO: fix clang build errors and warnings	2024-07-25 09:49:19 +02:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()	2024-06-27 13:46:21 +02:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
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: add leah to 6.1 MAINTAINERS file	2024-05-17 11:56:16 +02:00
Makefile	Linux 6.1.102	2024-07-27 11:32:20 +02:00
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.