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Zhang Yi a4d60ba277 ext4: fix out of bounds punch offset 
[ Upstream commit b5e58bcd79 ]

Punching a hole with a start offset that exceeds max_end is not
permitted and will result in a negative length in the
truncate_inode_partial_folio() function while truncating the page cache,
potentially leading to undesirable consequences.

A simple reproducer:

  truncate -s 9895604649994 /mnt/foo
  xfs_io -c "pwrite 8796093022208 4096" /mnt/foo
  xfs_io -c "fpunch 8796093022213 25769803777" /mnt/foo

  kernel BUG at include/linux/highmem.h:275!
  Oops: invalid opcode: 0000 [#1] SMP PTI
  CPU: 3 UID: 0 PID: 710 Comm: xfs_io Not tainted 6.15.0-rc3
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014
  RIP: 0010:zero_user_segments.constprop.0+0xd7/0x110
  RSP: 0018:ffffc90001cf3b38 EFLAGS: 00010287
  RAX: 0000000000000005 RBX: ffffea0001485e40 RCX: 0000000000001000
  RDX: 000000000040b000 RSI: 0000000000000005 RDI: 000000000040b000
  RBP: 000000000040affb R08: ffff888000000000 R09: ffffea0000000000
  R10: 0000000000000003 R11: 00000000fffc7fc5 R12: 0000000000000005
  R13: 000000000040affb R14: ffffea0001485e40 R15: ffff888031cd3000
  FS:  00007f4f63d0b780(0000) GS:ffff8880d337d000(0000)
  knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 000000001ae0b038 CR3: 00000000536aa000 CR4: 00000000000006f0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   <TASK>
   truncate_inode_partial_folio+0x3dd/0x620
   truncate_inode_pages_range+0x226/0x720
   ? bdev_getblk+0x52/0x3e0
   ? ext4_get_group_desc+0x78/0x150
   ? crc32c_arch+0xfd/0x180
   ? __ext4_get_inode_loc+0x18c/0x840
   ? ext4_inode_csum+0x117/0x160
   ? jbd2_journal_dirty_metadata+0x61/0x390
   ? __ext4_handle_dirty_metadata+0xa0/0x2b0
   ? kmem_cache_free+0x90/0x5a0
   ? jbd2_journal_stop+0x1d5/0x550
   ? __ext4_journal_stop+0x49/0x100
   truncate_pagecache_range+0x50/0x80
   ext4_truncate_page_cache_block_range+0x57/0x3a0
   ext4_punch_hole+0x1fe/0x670
   ext4_fallocate+0x792/0x17d0
   ? __count_memcg_events+0x175/0x2a0
   vfs_fallocate+0x121/0x560
   ksys_fallocate+0x51/0xc0
   __x64_sys_fallocate+0x24/0x40
   x64_sys_call+0x18d2/0x4170
   do_syscall_64+0xa7/0x220
   entry_SYSCALL_64_after_hwframe+0x76/0x7e

Fix this by filtering out cases where the punching start offset exceeds
max_end.

Fixes: 982bf37da0 ("ext4: refactor ext4_punch_hole()")
Reported-by: Liebes Wang <wanghaichi0403@gmail.com>
Closes: https://lore.kernel.org/linux-ext4/ac3a58f6-e686-488b-a9ee-fc041024e43d@huawei.com/
Tested-by: Liebes Wang <wanghaichi0403@gmail.com>
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Baokun Li <libaokun1@huawei.com>
Link: https://patch.msgid.link/20250506012009.3896990-1-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-08-01 09:48:46 +01:00
arch arm64: dts: qcom: x1e78100-t14s: mark l12b and l15b always-on 2025-08-01 09:48:45 +01:00
block block: fix kobject leak in blk_unregister_queue 2025-07-24 08:56:30 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP() 2025-07-17 18:37:24 +02:00
Documentation bpf: Adjust free target to avoid global starvation of LRU map 2025-07-17 18:37:22 +02:00
drivers mtd: rawnand: qcom: Fix last codeword read in qcom_param_page_type_exec() 2025-08-01 09:48:45 +01:00
fs ext4: fix out of bounds punch offset 2025-08-01 09:48:46 +01:00
include sprintf.h requires stdarg.h 2025-08-01 09:48:43 +01:00
init rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
io_uring io_uring/poll: fix POLLERR handling 2025-07-24 08:56:23 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel selftests/bpf: Add tests with stack ptr register in conditional jmp 2025-08-01 09:48:44 +01:00
lib lib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users() 2025-07-17 18:37:14 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/zsmalloc: do not pass __GFP_MOVABLE if CONFIG_COMPACTION=n 2025-08-01 09:48:44 +01:00
net net/sched: sch_qfq: Avoid triggering might_sleep in atomic context in qfq_delete_class 2025-08-01 09:48:41 +01:00
rust rust: use #[used(compiler)] to fix build and modpost with Rust >= 1.89.0 2025-07-24 08:56:37 +02:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-05-29 11:02:01 +02:00
scripts rust: use #[used(compiler)] to fix build and modpost with Rust >= 1.89.0 2025-07-24 08:56:37 +02:00
security selinux: change security_compute_sid to return the ssid or tsid on match 2025-07-10 16:05:04 +02:00
sound ALSA: hda/realtek - Add mute LED support for HP Victus 15-fa0xxx 2025-08-01 09:48:43 +01:00
tools selftests/bpf: Add tests with stack ptr register in conditional jmp 2025-08-01 09:48:44 +01:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-07-17 18:37:08 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.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 Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.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: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
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: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.40 2025-07-24 08:56:38 +02:00
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.