CVE-2023-53270: 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…

PriorityP419medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.14%

4.2th percentile

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 i_disksize, newsize) // update i_disksize | generic_write_end | copied = block_write_end(copied, len) // copied = 0 | if (unlikely(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) 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) 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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.37-1 (bookworm)	linux 6.1.37-1 (bookworm)
linux	linux	—	—
linux	linux	>= 64769240bd07f446f83660bb143bb609d8ab4910 < 18eb23891aeae3229baf8c7c23b76be3364e1967	18eb23891aeae3229baf8c7c23b76be3364e1967
linux	linux	>= 64769240bd07f446f83660bb143bb609d8ab4910 < d30090eb546d993ea3f3023452540c476ea614a5	d30090eb546d993ea3f3023452540c476ea614a5
linux	linux	>= 64769240bd07f446f83660bb143bb609d8ab4910 < 3ecea2fee14227712694c8b54ad99d471e61de92	3ecea2fee14227712694c8b54ad99d471e61de92
linux	linux	>= 64769240bd07f446f83660bb143bb609d8ab4910 < 53877ed201baa6b58f7ce9df92664a839113c30e	53877ed201baa6b58f7ce9df92664a839113c30e
linux	linux	>= 64769240bd07f446f83660bb143bb609d8ab4910 < 1dedde690303c05ef732b7c5c8356fdf60a4ade3	1dedde690303c05ef732b7c5c8356fdf60a4ade3
linux	linux_kernel	>= 0 < 6.1.37-1	6.1.37-1
linux	linux_kernel	>= 0 < 6.3.7-1	6.3.7-1
linux	linux_kernel	>= 0 < 6.3.7-1	6.3.7-1
linux	linux_kernel	>= 2.6.27 < 5.15.111	5.15.111
linux	linux_kernel	>= 5.16 < 6.1.28	6.1.28
linux	linux_kernel	>= 6.2 < 6.2.15	6.2.15
linux	linux_kernel	>= 6.3 < 6.3.2	6.3.2

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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