Message-ID: <2025070426-CVE-2025-38222-3cfe@gregkh>
Date: Fri,  4 Jul 2025 15:37:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38222: ext4: inline: fix len overflow in ext4_prepare_inline_data

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

ext4: inline: fix len overflow in ext4_prepare_inline_data

When running the following code on an ext4 filesystem with inline_data
feature enabled, it will lead to the bug below.

        fd = open("file1", O_RDWR | O_CREAT | O_TRUNC, 0666);
        ftruncate(fd, 30);
        pwrite(fd, "a", 1, (1UL << 40) + 5UL);

That happens because write_begin will succeed as when
ext4_generic_write_inline_data calls ext4_prepare_inline_data, pos + len
will be truncated, leading to ext4_prepare_inline_data parameter to be 6
instead of 0x10000000006.

Then, later when write_end is called, we hit:

        BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);

at ext4_write_inline_data.

Fix it by using a loff_t type for the len parameter in
ext4_prepare_inline_data instead of an unsigned int.

[   44.545164] ------------[ cut here ]------------
[   44.545530] kernel BUG at fs/ext4/inline.c:240!
[   44.545834] Oops: invalid opcode: 0000 [#1] SMP NOPTI
[   44.546172] CPU: 3 UID: 0 PID: 343 Comm: test Not tainted 6.15.0-rc2-00003-g9080916f4863 #45 PREEMPT(full)  112853fcebfdb93254270a7959841d2c6aa2c8bb
[   44.546523] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   44.546523] RIP: 0010:ext4_write_inline_data+0xfe/0x100
[   44.546523] Code: 3c 0e 48 83 c7 48 48 89 de 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e4 fa 43 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 0f 0b <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 49
[   44.546523] RSP: 0018:ffffb342008b79a8 EFLAGS: 00010216
[   44.546523] RAX: 0000000000000001 RBX: ffff9329c579c000 RCX: 0000010000000006
[   44.546523] RDX: 000000000000003c RSI: ffffb342008b79f0 RDI: ffff9329c158e738
[   44.546523] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
[   44.546523] R10: 00007ffffffff000 R11: ffffffff9bd0d910 R12: 0000006210000000
[   44.546523] R13: fffffc7e4015e700 R14: 0000010000000005 R15: ffff9329c158e738
[   44.546523] FS:  00007f4299934740(0000) GS:ffff932a60179000(0000) knlGS:0000000000000000
[   44.546523] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   44.546523] CR2: 00007f4299a1ec90 CR3: 0000000002886002 CR4: 0000000000770eb0
[   44.546523] PKRU: 55555554
[   44.546523] Call Trace:
[   44.546523]  <TASK>
[   44.546523]  ext4_write_inline_data_end+0x126/0x2d0
[   44.546523]  generic_perform_write+0x17e/0x270
[   44.546523]  ext4_buffered_write_iter+0xc8/0x170
[   44.546523]  vfs_write+0x2be/0x3e0
[   44.546523]  __x64_sys_pwrite64+0x6d/0xc0
[   44.546523]  do_syscall_64+0x6a/0xf0
[   44.546523]  ? __wake_up+0x89/0xb0
[   44.546523]  ? xas_find+0x72/0x1c0
[   44.546523]  ? next_uptodate_folio+0x317/0x330
[   44.546523]  ? set_pte_range+0x1a6/0x270
[   44.546523]  ? filemap_map_pages+0x6ee/0x840
[   44.546523]  ? ext4_setattr+0x2fa/0x750
[   44.546523]  ? do_pte_missing+0x128/0xf70
[   44.546523]  ? security_inode_post_setattr+0x3e/0xd0
[   44.546523]  ? ___pte_offset_map+0x19/0x100
[   44.546523]  ? handle_mm_fault+0x721/0xa10
[   44.546523]  ? do_user_addr_fault+0x197/0x730
[   44.546523]  ? do_syscall_64+0x76/0xf0
[   44.546523]  ? arch_exit_to_user_mode_prepare+0x1e/0x60
[   44.546523]  ? irqentry_exit_to_user_mode+0x79/0x90
[   44.546523]  entry_SYSCALL_64_after_hwframe+0x55/0x5d
[   44.546523] RIP: 0033:0x7f42999c6687
[   44.546523] Code: 48 89 fa 4c 89 df e8 58 b3 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[   44.546523] RSP: 002b:00007ffeae4a7930 EFLAGS: 00000202 ORIG_RAX: 0000000000000012
[   44.546523] RAX: ffffffffffffffda RBX: 00007f4299934740 RCX: 00007f42999c6687
[   44.546523] RDX: 0000000000000001 RSI: 000055ea6149200f RDI: 0000000000000003
[   44.546523] RBP: 00007ffeae4a79a0 R08: 0000000000000000 R09: 0000000000000000
[   44.546523] R10: 0000010000000005 R11: 0000000000000202 R12: 0000000000000000
[   44.546523] R13: 00007ffeae4a7ac8 R14: 00007f4299b86000 R15: 000055ea61493dd8
[   44.546523]  </TASK>
[   44.546523] Modules linked in:
[   44.568501] ---[ end trace 0000000000000000 ]---
[   44.568889] RIP: 0010:ext4_write_inline_data+0xfe/0x100
[   44.569328] Code: 3c 0e 48 83 c7 48 48 89 de 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e4 fa 43 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 0f 0b <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 49
[   44.570931] RSP: 0018:ffffb342008b79a8 EFLAGS: 00010216
[   44.571356] RAX: 0000000000000001 RBX: ffff9329c579c000 RCX: 0000010000000006
[   44.571959] RDX: 000000000000003c RSI: ffffb342008b79f0 RDI: ffff9329c158e738
[   44.572571] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
[   44.573148] R10: 00007ffffffff000 R11: ffffffff9bd0d910 R12: 0000006210000000
[   44.573748] R13: fffffc7e4015e700 R14: 0000010000000005 R15: ffff9329c158e738
[   44.574335] FS:  00007f4299934740(0000) GS:ffff932a60179000(0000) knlGS:0000000000000000
[   44.575027] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   44.575520] CR2: 00007f4299a1ec90 CR3: 0000000002886002 CR4: 0000000000770eb0
[   44.576112] PKRU: 55555554
[   44.576338] Kernel panic - not syncing: Fatal exception
[   44.576517] Kernel Offset: 0x1a600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

The Linux kernel CVE team has assigned CVE-2025-38222 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 5.4.295 with commit d3dfc60efd145df5324b99a244b0b05505cde29b
	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 5.10.239 with commit 717414a8c083c376d4a8940a1230fe0c6ed4ee00
	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 5.15.186 with commit 9d1d1c5bf4fc1af76be154d3afb2acdbd89ec7d8
	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 6.1.142 with commit cf5f319a2d8ab8238f8cf3a19463b9bff6420934
	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 6.6.95 with commit 26e09d18599da0adc543eabd300080daaeda6869
	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 6.12.35 with commit 5766da2237e539f259aa0e5f3639ae37b44ca458
	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 6.15.4 with commit e80ee0263d88d77f2fd1927f915003a7066cbb50
	Issue introduced in 3.8 with commit f19d5870cbf72d4cb2a8e1f749dff97af99b071e and fixed in 6.16-rc1 with commit 227cb4ca5a6502164f850d22aec3104d7888b270

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-38222
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/ext4/inline.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/d3dfc60efd145df5324b99a244b0b05505cde29b
	https://git.kernel.org/stable/c/717414a8c083c376d4a8940a1230fe0c6ed4ee00
	https://git.kernel.org/stable/c/9d1d1c5bf4fc1af76be154d3afb2acdbd89ec7d8
	https://git.kernel.org/stable/c/cf5f319a2d8ab8238f8cf3a19463b9bff6420934
	https://git.kernel.org/stable/c/26e09d18599da0adc543eabd300080daaeda6869
	https://git.kernel.org/stable/c/5766da2237e539f259aa0e5f3639ae37b44ca458
	https://git.kernel.org/stable/c/e80ee0263d88d77f2fd1927f915003a7066cbb50
	https://git.kernel.org/stable/c/227cb4ca5a6502164f850d22aec3104d7888b270

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