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Song Liu 3d4e15ef5c livepatch: Match old_sympos 0 and 1 in klp_find_func() 
[ Upstream commit 139560e8b9 ]

When there is only one function of the same name, old_sympos of 0 and 1
are logically identical. Match them in klp_find_func().

This is to avoid a corner case with different toolchain behavior.

In this specific issue, two versions of kpatch-build were used to
build livepatch for the same kernel. One assigns old_sympos == 0 for
unique local functions, the other assigns old_sympos == 1 for unique
local functions. Both versions work fine by themselves. (PS: This
behavior change was introduced in a downstream version of kpatch-build.
This change does not exist in upstream kpatch-build.)

However, during livepatch upgrade (with the replace flag set) from a
patch built with one version of kpatch-build to the same fix built with
the other version of kpatch-build, livepatching fails with errors like:

[   14.218706] sysfs: cannot create duplicate filename 'xxx/somefunc,1'
...
[   14.219466] Call Trace:
[   14.219468]  <TASK>
[   14.219469]  dump_stack_lvl+0x47/0x60
[   14.219474]  sysfs_warn_dup.cold+0x17/0x27
[   14.219476]  sysfs_create_dir_ns+0x95/0xb0
[   14.219479]  kobject_add_internal+0x9e/0x260
[   14.219483]  kobject_add+0x68/0x80
[   14.219485]  ? kstrdup+0x3c/0xa0
[   14.219486]  klp_enable_patch+0x320/0x830
[   14.219488]  patch_init+0x443/0x1000 [ccc_0_6]
[   14.219491]  ? 0xffffffffa05eb000
[   14.219492]  do_one_initcall+0x2e/0x190
[   14.219494]  do_init_module+0x67/0x270
[   14.219496]  init_module_from_file+0x75/0xa0
[   14.219499]  idempotent_init_module+0x15a/0x240
[   14.219501]  __x64_sys_finit_module+0x61/0xc0
[   14.219503]  do_syscall_64+0x5b/0x160
[   14.219505]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[   14.219507] RIP: 0033:0x7f545a4bd96d
...
[   14.219516] kobject: kobject_add_internal failed for somefunc,1 with
    -EEXIST, don't try to register things with the same name ...

This happens because klp_find_func() thinks somefunc with old_sympos==0
is not the same as somefunc with old_sympos==1, and klp_add_object_nops
adds another xxx/func,1 to the list of functions to patch.

Signed-off-by: Song Liu <song@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
[pmladek@suse.com: Fixed some typos.]
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-19 13:09:42 +01:00
arch x86/ptrace: Always inline trivial accessors 2026-01-19 13:09:41 +01:00
block blk-mq: Abort suspend when wakeup events are pending 2026-01-19 13:09:39 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id 2026-01-19 13:09:24 +01:00
Documentation fs_context: drop the unused lsm_flags member 2026-01-19 13:09:38 +01:00
drivers cpufreq: s5pv210: fix refcount leak 2026-01-19 13:09:42 +01:00
fs btrfs: fix memory leak of fs_devices in degraded seed device path 2026-01-19 13:09:41 +01:00
include efi/cper: align ARM CPER type with UEFI 2.9A/2.10 specs 2026-01-19 13:09:40 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:21:45 +02:00
io_uring io_uring: fix possible deadlock in io_register_iowq_max_workers() 2024-11-17 15:06:25 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:05:26 +01:00
kernel livepatch: Match old_sympos 0 and 1 in klp_find_func() 2026-01-19 13:09:42 +01:00
lib lib/vsprintf: Check pointer before dereferencing in time_and_date() 2026-01-19 13:09:29 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/secretmem: fix use-after-free race in fault handler 2025-12-07 06:09:32 +09:00
net netfilter: nf_conncount: garbage collection is not skipped when jiffies wrap around 2026-01-19 13:09:40 +01:00
samples samples: mei: Fix building on musl libc 2025-08-28 16:24:07 +02:00
scripts Makefile.compiler: replace cc-ifversion with compiler-specific macros 2025-12-07 06:09:32 +09:00
security ima: Handle error code returned by ima_filter_rule_match() 2026-01-19 13:09:31 +01:00
sound ASoC: fsl_xcvr: get channel status data when PHY is not exists 2026-01-19 13:09:40 +01:00
tools perf tools: Fix split kallsyms DSO counting 2026-01-19 13:09:36 +01:00
usr kbuild: hdrcheck: fix cross build with clang 2025-06-27 11:05:22 +01:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-10-22 15:40:41 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:11:10 +02:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:09:36 +09:00
Makefile Linux 5.15.197 2025-12-07 06:09:37 +09:00
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.