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Osama Muhammad 6e2902ecc7 UBSAN: array-index-out-of-bounds in dtSplitRoot [ Upstream commit `27e56f59ba` ] Syzkaller reported the following issue: oop0: detected capacity change from 0 to 32768 UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:1971:9 index -2 is out of range for type 'struct dtslot [128]' CPU: 0 PID: 3613 Comm: syz-executor270 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_out_of_bounds+0xdb/0x130 lib/ubsan.c:283 dtSplitRoot+0x8d8/0x1900 fs/jfs/jfs_dtree.c:1971 dtSplitUp fs/jfs/jfs_dtree.c:985 [inline] dtInsert+0x1189/0x6b80 fs/jfs/jfs_dtree.c:863 jfs_mkdir+0x757/0xb00 fs/jfs/namei.c:270 vfs_mkdir+0x3b3/0x590 fs/namei.c:4013 do_mkdirat+0x279/0x550 fs/namei.c:4038 __do_sys_mkdirat fs/namei.c:4053 [inline] __se_sys_mkdirat fs/namei.c:4051 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4051 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcdc0113fd9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb8bc67d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcdc0113fd9 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 RBP: 00007fcdc00d37a0 R08: 0000000000000000 R09: 00007fcdc00d37a0 R10: 00005555559a72c0 R11: 0000000000000246 R12: 00000000f8008000 R13: 0000000000000000 R14: 00083878000000f8 R15: 0000000000000000 </TASK> The issue is caused when the value of fsi becomes less than -1. The check to break the loop when fsi value becomes -1 is present but syzbot was able to produce value less than -1 which cause the error. This patch simply add the change for the values less than 0. The patch is tested via syzbot. Reported-and-tested-by: syzbot+d4b1df2e9d4ded6488ec@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=d4b1df2e9d4ded6488ec Signed-off-by: Osama Muhammad <osmtendev@gmail.com> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-02-05 20:16:46 +00:00
arch	x86/mce: Mark fatal MCE's page as poison to avoid panic in the kdump kernel	2024-02-05 20:16:45 +00:00
block	block: Move checking GENHD_FL_NO_PART to bdev_add_partition()	2024-01-31 16:21:20 -08:00
certs	This update includes the following changes:	2023-11-02 16:15:30 -10:00
crypto	crypto: api - Disallow identical driver names	2024-01-31 16:20:54 -08:00
Documentation	drm: Allow drivers to indicate the damage helpers to ignore damage clips	2024-01-31 16:21:13 -08:00
drivers	thermal: core: Fix thermal zone suspend-resume synchronization	2024-02-05 20:16:46 +00:00
fs	UBSAN: array-index-out-of-bounds in dtSplitRoot	2024-02-05 20:16:46 +00:00
include	thermal: core: Fix thermal zone suspend-resume synchronization	2024-02-05 20:16:46 +00:00
init	rootfs: Fix support for rootfstype= when root= is given	2024-01-25 15:45:15 -08:00
io_uring	io_uring: adjust defer tw counting	2024-01-25 15:45:30 -08:00
ipc	Many singleton patches against the MM code. The patch series which are	2023-11-02 19:38:47 -10:00
kernel	audit: Send netlink ACK before setting connection in auditd_set	2024-02-05 20:16:45 +00:00
lib	kunit: Reset test->priv after each param iteration	2024-02-05 20:16:46 +00:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	memblock: fix crash when reserved memory is not added to memory	2024-01-31 16:21:18 -08:00
net	netfilter: nf_tables: reject QUEUE/DROP verdict parameters	2024-01-31 16:21:12 -08:00
rust	rust: Ignore preserve-most functions	2024-01-25 15:45:09 -08:00
samples	Landlock updates for v6.7-rc1	2023-11-03 09:28:53 -10:00
scripts	scripts/get_abi: fix source path leak	2024-01-31 16:21:00 -08:00
security	lsm: new security_file_ioctl_compat() hook	2024-01-31 16:21:00 -08:00
sound	soundwire: fix initializing sysfs for same devices on different buses	2024-01-31 16:20:53 -08:00
tools	kunit: tool: fix parsing of test attributes	2024-02-05 20:16:46 +00:00
usr	arch: Remove Itanium (IA-64) architecture	2023-09-11 08:13:17 +00:00
virt	KVM/arm64 fixes for 6.7, part #2	2023-12-22 18:03:54 -05:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	kbuild: rpm-pkg: generate kernel.spec in rpmbuild/SPECS/	2023-10-03 20:49:09 +09:00
.mailmap	12 hotfixes. 2 are cc:stable and the remainder either address post-6.7	2024-01-05 13:46:18 -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	12 hotfixes. 2 are cc:stable and the remainder either address post-6.7	2024-01-05 13:46:18 -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	12 hotfixes. 2 are cc:stable and the remainder either address post-6.7	2024-01-05 13:46:18 -08:00
Makefile	Linux 6.7.3	2024-01-31 16:21:21 -08:00
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.