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Vasily Gorbik fdf605f64f crash_dump: fix dm_crypt keys locking and ref leak 
[ Upstream commit 96a54b8ffc ]

crash_load_dm_crypt_keys() reads dm-crypt volume keys from the user
keyring.  It uses user_key_payload_locked() without holding key->sem,
which makes lockdep complain when kexec_file_load() assembles the crash
image:

  =============================
  WARNING: suspicious RCU usage
  -----------------------------
  ./include/keys/user-type.h:53 suspicious rcu_dereference_protected() usage!

  other info that might help us debug this:

  rcu_scheduler_active = 2, debug_locks = 1
  no locks held by kexec/4875.

  stack backtrace:
  Call Trace:
   <TASK>
   dump_stack_lvl+0x5d/0x80
   lockdep_rcu_suspicious.cold+0x4e/0x96
   crash_load_dm_crypt_keys+0x314/0x390
   bzImage64_load+0x116/0x9a0
   ? __lock_acquire+0x464/0x1ba0
   __do_sys_kexec_file_load+0x26a/0x4f0
   do_syscall_64+0xbd/0x430
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

In addition, the key returned by request_key() is never key_put()'d,
leaking a key reference on each load attempt.

Take key->sem while copying the payload and drop the key reference
afterwards.

Link: https://lkml.kernel.org/r/patch.git-2d4d76083a5c.your-ad-here.call-01769426386-ext-2560@work.hours
Fixes: 479e58549b ("crash_dump: store dm crypt keys in kdump reserved memory")
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Coiby Xu <coxu@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:21:20 -05:00
arch powerpc/smp: Add check for kcalloc() failure in parse_thread_groups() 2026-03-04 07:21:19 -05:00
block block: decouple secure erase size limit from discard size limit 2026-03-04 07:19:38 -05:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:32:12 +01:00
Documentation ipv6: Move ipv6_fl_list from ipv6_pinfo to inet_sock. 2026-03-04 07:20:44 -05:00
drivers rapidio: replace rio_free_net() with kfree() in rio_scan_alloc_net() 2026-03-04 07:21:20 -05:00
fs ocfs2: fix reflink preserve cleanup issue 2026-03-04 07:21:20 -05:00
include compiler-clang.h: require LLVM 19.1.0 or higher for __typeof_unqual__ 2026-03-04 07:21:20 -05:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/net: don't continue send bundle if poll was required for retry 2026-03-04 07:21:18 -05:00
ipc ipc: don't audit capability check in ipc_permissions() 2026-02-26 14:59:19 -08:00
kernel crash_dump: fix dm_crypt keys locking and ref leak 2026-03-04 07:21:20 -05:00
lib Remove WARN_ALL_UNSEEDED_RANDOM kernel config option 2026-03-04 07:20:46 -05:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/highmem: fix __kmap_to_page() build error 2026-03-04 07:21:19 -05:00
net netfilter: nf_conntrack_h323: fix OOB read in decode_choice() 2026-03-04 07:20:52 -05:00
rust rust/drm: Fix Registration::{new,new_foreign_owned}() docs 2026-03-04 07:21:15 -05:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts docs: kdoc: avoid error_count overflows 2026-03-04 07:21:10 -05:00
security ima: verify the previous kernel's IMA buffer lies in addressable RAM 2026-03-04 07:21:17 -05:00
sound ASoC: SOF: ipc4-control: Keep the payload size up to date 2026-03-04 07:20:54 -05:00
tools tools: Fix bitfield dependency failure 2026-03-04 07:21:19 -05:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:41:44 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.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: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.15 2026-02-27 16:05:10 -05:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.