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CVE-2021-47460— ocfs2: fix data corruption after conversion from inline format

EPSS 0.03% · P7

Affected Version Matrix 17

VendorProductVersion RangeStatus
LinuxLinuxacef5107e2eacb08a16ad5db60320d65bd26a6c0< 560edd14de2bf9dbc0129681eeb4d5ef87cc105faffected
7ed80e77c908cbaa686529a49f8ae0060c5caee7< 8e6bfb4f70168ddfd32fb6dc028ad52faaf1f32eaffected
7ce2b16bad2cbfa3fa7bbc42c4448914f639ca47< a3a089c241cd49b33a8cdd7fcb37cc87a086912aaffected
f8a6a2ed4b7d1c3c8631eeb6d00572bc853094a8< b05caf023b14cbed9223bb5b48ecc7bffe38f632affected
6dbf7bb555981fb5faf7b691e8f6169fc2b2e63b< f1b98569e81c37d7e0deada7172f8f60860c1360affected
6dbf7bb555981fb5faf7b691e8f6169fc2b2e63b< fa9b6b6c953e3f6441ed6cf83b4c771dac2dae08affected
6dbf7bb555981fb5faf7b691e8f6169fc2b2e63b< 5314454ea3ff6fc746eaf71b9a7ceebed52888faaffected
36ed9e604215f58cec0381ca5fcc6da05f2d87caaffected
… +9 more rows
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I. Basic Information for CVE-2021-47460

Vulnerability Information
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Vulnerability Title
ocfs2: fix data corruption after conversion from inline format
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix data corruption after conversion from inline format Commit 6dbf7bb55598 ("fs: Don't invalidate page buffers in block_write_full_page()") uncovered a latent bug in ocfs2 conversion from inline inode format to a normal inode format. The code in ocfs2_convert_inline_data_to_extents() attempts to zero out the whole cluster allocated for file data by grabbing, zeroing, and dirtying all pages covering this cluster. However these pages are beyond i_size, thus writeback code generally ignores these dirty pages and no blocks were ever actually zeroed on the disk. This oversight was fixed by commit 693c241a5f6a ("ocfs2: No need to zero pages past i_size.") for standard ocfs2 write path, inline conversion path was apparently forgotten; the commit log also has a reasoning why the zeroing actually is not needed. After commit 6dbf7bb55598, things became worse as writeback code stopped invalidating buffers on pages beyond i_size and thus these pages end up with clean PageDirty bit but with buffers attached to these pages being still dirty. So when a file is converted from inline format, then writeback triggers, and then the file is grown so that these pages become valid, the invalid dirtiness state is preserved, mark_buffer_dirty() does nothing on these pages (buffers are already dirty) but page is never written back because it is clean. So data written to these pages is lost once pages are reclaimed. Simple reproducer for the problem is: xfs_io -f -c "pwrite 0 2000" -c "pwrite 2000 2000" -c "fsync" \ -c "pwrite 4000 2000" ocfs2_file After unmounting and mounting the fs again, you can observe that end of 'ocfs2_file' has lost its contents. Fix the problem by not doing the pointless zeroing during conversion from inline format similarly as in the standard write path. [akpm@linux-foundation.org: fix whitespace, per Joseph]
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于从内联格式转换后会导致数据损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux acef5107e2eacb08a16ad5db60320d65bd26a6c0 ~ 560edd14de2bf9dbc0129681eeb4d5ef87cc105f -
LinuxLinux 5.10 -

II. Public POCs for CVE-2021-47460

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III. Intelligence Information for CVE-2021-47460

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Same Patch Batch · Linux · 2024-05-22 · 63 CVEs total

CVE-2021-47477comedi: dt9812: fix DMA buffers on stack
CVE-2021-47493ocfs2: fix race between searching chunks and release journal_head from buffer_head
CVE-2021-47495usbnet: sanity check for maxpacket
CVE-2021-47496net/tls: Fix flipped sign in tls_err_abort() calls
CVE-2021-47494cfg80211: fix management registrations locking
CVE-2021-47481RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR
CVE-2021-47482net: batman-adv: fix error handling
CVE-2021-47480scsi: core: Put LLD module refcnt after SCSI device is released
CVE-2021-47478isofs: Fix out of bound access for corrupted isofs image
CVE-2021-47479staging: rtl8712: fix use-after-free in rtl8712_dl_fw
CVE-2021-47483regmap: Fix possible double-free in regcache_rbtree_exit()
CVE-2021-47476comedi: ni_usb6501: fix NULL-deref in command paths
CVE-2021-47475comedi: vmk80xx: fix transfer-buffer overflows
CVE-2021-47474comedi: vmk80xx: fix bulk-buffer overflow
CVE-2021-47473scsi: qla2xxx: Fix a memory leak in an error path of qla2x00_process_els()
CVE-2021-47471drm: mxsfb: Fix NULL pointer dereference crash on unload
CVE-2021-47470mm, slub: fix potential use-after-free in slab_debugfs_fops
CVE-2021-47468isdn: mISDN: Fix sleeping function called from invalid context
CVE-2021-47467kunit: fix reference count leak in kfree_at_end
CVE-2021-47466mm, slub: fix potential memoryleak in kmem_cache_open()

Showing top 20 of 63 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47460

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