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Aleksei Nikiforov 13dcd6308c s390/fpu: Fix false-positive kmsan report in fpu_vstl() [ Upstream commit `14e4e4175b` ] A false-positive kmsan report is detected when running ping command. An inline assembly instruction 'vstl' can write varied amount of bytes depending on value of 'index' argument. If 'index' > 0, 'vstl' writes at least 2 bytes. clang generates kmsan write helper call depending on inline assembly constraints. Constraints are evaluated compile-time, but value of 'index' argument is known only at runtime. clang currently generates call to __msan_instrument_asm_store with 1 byte as size. Manually call kmsan function to indicate correct amount of bytes written and fix false-positive report. This change fixes following kmsan reports: [ 36.563119] ===================================================== [ 36.563594] BUG: KMSAN: uninit-value in virtqueue_add+0x35c6/0x7c70 [ 36.563852] virtqueue_add+0x35c6/0x7c70 [ 36.564016] virtqueue_add_outbuf+0xa0/0xb0 [ 36.564266] start_xmit+0x288c/0x4a20 [ 36.564460] dev_hard_start_xmit+0x302/0x900 [ 36.564649] sch_direct_xmit+0x340/0xea0 [ 36.564894] __dev_queue_xmit+0x2e94/0x59b0 [ 36.565058] neigh_resolve_output+0x936/0xb40 [ 36.565278] __neigh_update+0x2f66/0x3a60 [ 36.565499] neigh_update+0x52/0x60 [ 36.565683] arp_process+0x1588/0x2de0 [ 36.565916] NF_HOOK+0x1da/0x240 [ 36.566087] arp_rcv+0x3e4/0x6e0 [ 36.566306] __netif_receive_skb_list_core+0x1374/0x15a0 [ 36.566527] netif_receive_skb_list_internal+0x1116/0x17d0 [ 36.566710] napi_complete_done+0x376/0x740 [ 36.566918] virtnet_poll+0x1bae/0x2910 [ 36.567130] __napi_poll+0xf4/0x830 [ 36.567294] net_rx_action+0x97c/0x1ed0 [ 36.567556] handle_softirqs+0x306/0xe10 [ 36.567731] irq_exit_rcu+0x14c/0x2e0 [ 36.567910] do_io_irq+0xd4/0x120 [ 36.568139] io_int_handler+0xc2/0xe8 [ 36.568299] arch_cpu_idle+0xb0/0xc0 [ 36.568540] arch_cpu_idle+0x76/0xc0 [ 36.568726] default_idle_call+0x40/0x70 [ 36.568953] do_idle+0x1d6/0x390 [ 36.569486] cpu_startup_entry+0x9a/0xb0 [ 36.569745] rest_init+0x1ea/0x290 [ 36.570029] start_kernel+0x95e/0xb90 [ 36.570348] startup_continue+0x2e/0x40 [ 36.570703] [ 36.570798] Uninit was created at: [ 36.571002] kmem_cache_alloc_node_noprof+0x9e8/0x10e0 [ 36.571261] kmalloc_reserve+0x12a/0x470 [ 36.571553] __alloc_skb+0x310/0x860 [ 36.571844] __ip_append_data+0x483e/0x6a30 [ 36.572170] ip_append_data+0x11c/0x1e0 [ 36.572477] raw_sendmsg+0x1c8c/0x2180 [ 36.572818] inet_sendmsg+0xe6/0x190 [ 36.573142] __sys_sendto+0x55e/0x8e0 [ 36.573392] __s390x_sys_socketcall+0x19ae/0x2ba0 [ 36.573571] __do_syscall+0x12e/0x240 [ 36.573823] system_call+0x6e/0x90 [ 36.573976] [ 36.574017] Byte 35 of 98 is uninitialized [ 36.574082] Memory access of size 98 starts at 0000000007aa0012 [ 36.574218] [ 36.574325] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.17.0-dirty #16 NONE [ 36.574541] Tainted: [B]=BAD_PAGE, [N]=TEST [ 36.574617] Hardware name: IBM 3931 A01 703 (KVM/Linux) [ 36.574755] ===================================================== [ 63.532541] ===================================================== [ 63.533639] BUG: KMSAN: uninit-value in virtqueue_add+0x35c6/0x7c70 [ 63.533989] virtqueue_add+0x35c6/0x7c70 [ 63.534940] virtqueue_add_outbuf+0xa0/0xb0 [ 63.535861] start_xmit+0x288c/0x4a20 [ 63.536708] dev_hard_start_xmit+0x302/0x900 [ 63.537020] sch_direct_xmit+0x340/0xea0 [ 63.537997] __dev_queue_xmit+0x2e94/0x59b0 [ 63.538819] neigh_resolve_output+0x936/0xb40 [ 63.539793] ip_finish_output2+0x1ee2/0x2200 [ 63.540784] __ip_finish_output+0x272/0x7a0 [ 63.541765] ip_finish_output+0x4e/0x5e0 [ 63.542791] ip_output+0x166/0x410 [ 63.543771] ip_push_pending_frames+0x1a2/0x470 [ 63.544753] raw_sendmsg+0x1f06/0x2180 [ 63.545033] inet_sendmsg+0xe6/0x190 [ 63.546006] __sys_sendto+0x55e/0x8e0 [ 63.546859] __s390x_sys_socketcall+0x19ae/0x2ba0 [ 63.547730] __do_syscall+0x12e/0x240 [ 63.548019] system_call+0x6e/0x90 [ 63.548989] [ 63.549779] Uninit was created at: [ 63.550691] kmem_cache_alloc_node_noprof+0x9e8/0x10e0 [ 63.550975] kmalloc_reserve+0x12a/0x470 [ 63.551969] __alloc_skb+0x310/0x860 [ 63.552949] __ip_append_data+0x483e/0x6a30 [ 63.553902] ip_append_data+0x11c/0x1e0 [ 63.554912] raw_sendmsg+0x1c8c/0x2180 [ 63.556719] inet_sendmsg+0xe6/0x190 [ 63.557534] __sys_sendto+0x55e/0x8e0 [ 63.557875] __s390x_sys_socketcall+0x19ae/0x2ba0 [ 63.558869] __do_syscall+0x12e/0x240 [ 63.559832] system_call+0x6e/0x90 [ 63.560780] [ 63.560972] Byte 35 of 98 is uninitialized [ 63.561741] Memory access of size 98 starts at 0000000005704312 [ 63.561950] [ 63.562824] CPU: 3 UID: 0 PID: 192 Comm: ping Tainted: G B N 6.17.0-dirty #16 NONE [ 63.563868] Tainted: [B]=BAD_PAGE, [N]=TEST [ 63.564751] Hardware name: IBM 3931 A01 703 (KVM/Linux) [ 63.564986] ===================================================== Fixes: `dcd3e1de9d` ("s390/checksum: provide csum_partial_copy_nocheck()") Signed-off-by: Aleksei Nikiforov <aleksei.nikiforov@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-12-18 14:03:00 +01:00
arch	s390/fpu: Fix false-positive kmsan report in fpu_vstl()	2025-12-18 14:03:00 +01:00
block	block/mq-deadline: Switch back to a single dispatch list	2025-12-18 14:02:33 +01:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id	2025-12-18 14:02:35 +01:00
Documentation	dt-bindings: PCI: amlogic: Fix the register name of the DBI region	2025-12-18 14:02:54 +01:00
drivers	crypto: iaa - Fix incorrect return value in save_iaa_wq()	2025-12-18 14:03:00 +01:00
fs	ocfs2: use correct endian in ocfs2_dinode_has_extents	2025-12-18 14:02:58 +01:00
include	coresight: Change device mode to atomic type	2025-12-18 14:02:56 +01:00
init	printk changes for 6.18	2025-10-04 11:13:11 -07:00
io_uring	io_uring/zcrx: call netdev_queue_get_dma_dev() under instance lock	2025-12-18 14:02:56 +01:00
ipc	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
kernel	bpf: Free special fields when update [lru_,]percpu_hash maps	2025-12-18 14:02:59 +01:00
lib	lib/vsprintf: Check pointer before dereferencing in time_and_date()	2025-12-18 14:02:58 +01:00
LICENSES	LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2	2025-07-24 11:15:39 +02:00
mm	8 hotfixes. 4 are cc:stable, 7 are against mm/.	2025-11-26 12:38:05 -08:00
net	net: export netdev_get_by_index_lock()	2025-12-18 14:02:56 +01:00
rust	rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags	2025-11-10 08:37:06 +08:00
samples	samples: work around glibc redefining some of our defines wrong	2025-11-21 09:29:02 -08:00
scripts	Rust fixes for v6.18 (2nd)	2025-11-14 15:36:15 -08:00
security	ima: Attach CREDS_CHECK IMA hook to bprm_creds_from_file LSM hook	2025-12-18 14:02:27 +01:00
sound	ALSA: hda/realtek: Add quirk for HP ProBook 450 G8	2025-11-26 07:26:56 +01:00
tools	perf tools: Fix missing feature check for inherit + SAMPLE_READ	2025-12-18 14:02:57 +01:00
usr	gen_init_cpio: Ignore fsync() returning EINVAL on pipes	2025-10-07 09:53:05 -07:00
virt	KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying	2025-11-04 09:16:53 -08:00
.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 6.18.1	2025-12-12 18:42:47 +01:00
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.