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Qasim Ijaz 82d0586c35 isofs: fix KMSAN uninit-value bug in do_isofs_readdir() [ Upstream commit `81a82e8f33` ] In do_isofs_readdir() when assigning the variable "struct iso_directory_record de" the b_data field of the buffer_head is accessed and an offset is added to it, the size of b_data is 2048 and the offset size is 2047, meaning "de = (struct iso_directory_record ) (bh->b_data + offset);" yields the final byte of the 2048 sized b_data block. The first byte of the directory record (de_len) is then read and found to be 31, meaning the directory record size is 31 bytes long. The directory record is defined by the structure: struct iso_directory_record { __u8 length; // 1 byte __u8 ext_attr_length; // 1 byte __u8 extent[8]; // 8 bytes __u8 size[8]; // 8 bytes __u8 date[7]; // 7 bytes __u8 flags; // 1 byte __u8 file_unit_size; // 1 byte __u8 interleave; // 1 byte __u8 volume_sequence_number[4]; // 4 bytes __u8 name_len; // 1 byte char name[]; // variable size } __attribute__((packed)); The fixed portion of this structure occupies 33 bytes. Therefore, a valid directory record must be at least 33 bytes long (even without considering the variable-length name field). Since de_len is only 31, it is insufficient to contain the complete fixed header. The code later hits the following sanity check that compares de_len against the sum of de->name_len and sizeof(struct iso_directory_record): if (de_len < de->name_len[0] + sizeof(struct iso_directory_record)) { ... } Since the fixed portion of the structure is 33 bytes (up to and including name_len member), a valid record should have de_len of at least 33 bytes; here, however, de_len is too short, and the field de->name_len (located at offset 32) is accessed even though it lies beyond the available 31 bytes. This access on the corrupted isofs data triggers a KASAN uninitialized memory warning. The fix would be to first verify that de_len is at least sizeof(struct iso_directory_record) before accessing any fields like de->name_len. Reported-by: syzbot <syzbot+812641c6c3d7586a1613@syzkaller.appspotmail.com> Tested-by: syzbot <syzbot+812641c6c3d7586a1613@syzkaller.appspotmail.com> Closes: https://syzkaller.appspot.com/bug?extid=812641c6c3d7586a1613 Fixes: `2deb1acc65` ("isofs: fix access to unallocated memory when reading corrupted filesystem") Signed-off-by: Qasim Ijaz <qasdev00@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://patch.msgid.link/20250211195900.42406-1-qasdev00@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-04-10 14:39:22 +02:00
arch	x86/dumpstack: Fix inaccurate unwinding from exception stacks due to misplaced assignment	2025-04-10 14:39:21 +02:00
block	block: fix 'kmem_cache of name 'bio-108' already exists'	2025-03-22 12:54:21 -07:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: api - Fix larval relookup type and mask	2025-04-10 14:39:20 +02:00
Documentation	dt-bindings: vendor-prefixes: add GOcontroll	2025-04-10 14:39:13 +02:00
drivers	phy: phy-rockchip-samsung-hdptx: Don't use dt aliases to determine phy-id	2025-04-10 14:39:22 +02:00
fs	isofs: fix KMSAN uninit-value bug in do_isofs_readdir()	2025-04-10 14:39:22 +02:00
include	RDMA/core: Don't expose hw_counters outside of init net namespace	2025-04-10 14:39:19 +02:00
init	rust: Disallow BTF generation with Rust + LTO	2025-03-22 12:54:23 -07:00
io_uring	io_uring/net: fix sendzc double notif flush	2025-03-28 22:03:32 +01:00
ipc	ipc: fix memleak if msg_init_ns failed in create_ipc_ns	2024-12-05 14:03:02 +01:00
kernel	bpf: Fix array bounds error with may_goto	2025-04-10 14:39:21 +02:00
lib	rust: fix signature of rust_fmt_argument	2025-04-10 14:39:20 +02:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range()	2025-04-10 14:39:18 +02:00
net	netfilter: socket: Lookup orig tuple for IPv6 SNAT	2025-04-07 10:08:35 +02:00
rust	rust: fix signature of rust_fmt_argument	2025-04-10 14:39:20 +02:00
samples	rust: treewide: switch to the kernel `Vec` type	2025-03-13 13:01:46 +01:00
scripts	selinux: Chain up tool resolving errors in install_policy.sh	2025-04-10 14:39:11 +02:00
security	smack: ipv4/ipv6: tcp/dccp/sctp: fix incorrect child socket label	2025-04-10 14:39:10 +02:00
sound	ALSA: timer: Don't take register_mutex with copy_from/to_user()	2025-04-10 14:39:13 +02:00
tools	perf: Always feature test reallocarray	2025-04-10 14:39:22 +02:00
usr	kbuild: hdrcheck: fix cross build with clang	2025-03-13 13:02:18 +01:00
virt	KVM: x86: switch hugepage recovery thread to vhost_task	2024-12-05 14:02:43 +01:00
.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: enable Clippy's `check-private-items`	2025-03-13 13:01:42 +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: add entry for the Rust `alloc` module	2025-03-13 13:01:47 +01:00
Makefile	Linux 6.12.22	2025-04-07 10:08:37 +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.