In the Linux kernel, the following vulnerability has been resolved:
ext4: fix i_disksize exceeding i_size problem in paritally written case
It is possible for i_disksize can exceed i_size, triggering a warning.
generic_perform_write
copied = iov_iter_copy_from_user_atomic(len) // copied < len
ext4_da_write_end
| ext4_update_i_disksize
| new_i_size = pos + copied;
| WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize) // update i_disksize
| generic_write_end
| copied = block_write_end(copied, len) // copied = 0
| if (unlikely(copied < len))
| if (!PageUptodate(page))
| copied = 0;
| if (pos + copied > inode->i_size) // return false
if (unlikely(copied == 0))
goto again;
if (unlikely(iov_iter_fault_in_readable(i, bytes))) {
status = -EFAULT;
break;
}
We get i_disksize greater than i_size here, which could trigger WARNING
check 'i_size_read(inode) < EXT4_I(inode)->i_disksize' while doing dio:
ext4_dio_write_iter
iomap_dio_rw
__iomap_dio_rw // return err, length is not aligned to 512
ext4_handle_inode_extension
WARN_ON_ONCE(i_size_read(inode) < EXT4_I(inode)->i_disksize) // Oops
WARNING: CPU: 2 PID: 2609 at fs/ext4/file.c:319
CPU: 2 PID: 2609 Comm: aa Not tainted 6.3.0-rc2
RIP: 0010:ext4_file_write_iter+0xbc7
Call Trace:
vfs_write+0x3b1
ksys_write+0x77
do_syscall_64+0x39
Fix it by updating 'copied' value before updating i_disksize just like
ext4_write_inline_data_end() does.
A reproducer can be found in the buganizer link below.
References
Configurations
Configuration 1 (hide)
|
History
03 Dec 2025, 16:56
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | NVD-CWE-noinfo | |
| First Time |
Linux
Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| References | () https://git.kernel.org/stable/c/18eb23891aeae3229baf8c7c23b76be3364e1967 - Patch | |
| References | () https://git.kernel.org/stable/c/1dedde690303c05ef732b7c5c8356fdf60a4ade3 - Patch | |
| References | () https://git.kernel.org/stable/c/3ecea2fee14227712694c8b54ad99d471e61de92 - Patch | |
| References | () https://git.kernel.org/stable/c/53877ed201baa6b58f7ce9df92664a839113c30e - Patch | |
| References | () https://git.kernel.org/stable/c/d30090eb546d993ea3f3023452540c476ea614a5 - Patch |
Information
Published : 2025-09-16 08:15
Updated : 2025-12-03 16:56
NVD link : CVE-2023-53270
Mitre link : CVE-2023-53270
CVE.ORG link : CVE-2023-53270
JSON object : View
Products Affected
linux
- linux_kernel
CWE