// For flags

CVE-2022-49352

ext4: fix warning in ext4_handle_inode_extension

Time Line
Published
2024-03-19
Updated
2024-03-19
Firt exploit
2024-03-19
Overview
Descriptions (1)
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SSVC
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EPSS
Affected Products (-)
Vendors (1)
linux
Products (1)
linux_kernel
Versions (6)
< 5.4.198, < 5.10.121, < 5.15.46, < 5.17.14, < 5.18.3, < 5.19
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References (6)
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Patches (6)
kernel
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Summary
Descriptions

In the Linux kernel, the following vulnerability has been resolved: ext4: fix warning in ext4_handle_inode_extension We got issue as follows:
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5741: Out of memory
EXT4-fs error (device loop0): ext4_setattr:5462: inode #13: comm syz-executor.0: mark_inode_dirty error
EXT4-fs error (device loop0) in ext4_setattr:5519: Out of memory
EXT4-fs error (device loop0): ext4_ind_map_blocks:595: inode #13: comm syz-executor.0: Can't allocate blocks for non-extent mapped inodes with bigalloc
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4361 at fs/ext4/file.c:301 ext4_file_write_iter+0x11c9/0x1220
Modules linked in:
CPU: 1 PID: 4361 Comm: syz-executor.0 Not tainted 5.10.0+ #1
RIP: 0010:ext4_file_write_iter+0x11c9/0x1220
RSP: 0018:ffff924d80b27c00 EFLAGS: 00010282
RAX: ffffffff815a3379 RBX: 0000000000000000 RCX: 000000003b000000
RDX: ffff924d81601000 RSI: 00000000000009cc RDI: 00000000000009cd
RBP: 000000000000000d R08: ffffffffbc5a2c6b R09: 0000902e0e52a96f
R10: ffff902e2b7c1b40 R11: ffff902e2b7c1b40 R12: 000000000000000a
R13: 0000000000000001 R14: ffff902e0e52aa10 R15: ffffffffffffff8b
FS: 00007f81a7f65700(0000) GS:ffff902e3bc80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000012db88001 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace: do_iter_readv_writev+0x2e5/0x360 do_iter_write+0x112/0x4c0 do_pwritev+0x1e5/0x390 __x64_sys_pwritev2+0x7e/0xa0 do_syscall_64+0x37/0x50 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Above issue may happen as follows:
Assume
inode.i_size=4096
EXT4_I(inode)->i_disksize=4096 step 1: set inode->i_isize = 8192
ext4_setattr if (attr->ia_size != inode->i_size) EXT4_I(inode)->i_disksize = attr->ia_size; rc = ext4_mark_inode_dirty ext4_reserve_inode_write ext4_get_inode_loc __ext4_get_inode_loc sb_getblk --> return -ENOMEM ... if (!error) ->will not update i_size i_size_write(inode, attr->ia_size);
Now:
inode.i_size=4096
EXT4_I(inode)->i_disksize=8192 step 2: Direct write 4096 bytes
ext4_file_write_iter ext4_dio_write_iter iomap_dio_rw ->return error if (extend) ext4_handle_inode_extension WARN_ON_ONCE(i_size_read(inode) < EXT4_I(inode)->i_disksize);
->Then trigger warning. To solve above issue, if mark inode dirty failed in ext4_setattr just
set 'EXT4_I(inode)->i_disksize' with old value.

*Credits: N/A
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Timeline
  • 2025-02-26 CVE Reserved
  • 2025-02-26 CVE Published
  • 2025-02-26 CVE Updated
  • ---------- EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
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Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
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 Linux Kernel
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 < 5.4.198
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en
Affected
Linux
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 Linux Kernel
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 < 5.10.121
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en
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Linux
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 Linux Kernel
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 < 5.15.46
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Linux
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 Linux Kernel
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 < 5.17.14
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en
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Linux
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 Linux Kernel
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 < 5.18.3
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Linux
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 Linux Kernel
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 < 5.19
Search vendor "Linux" for product "Linux Kernel" and version " < 5.19"
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