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CVE PROGRAM SOURCE RECORDUnscored

CVE-2021-47117

ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed We got follow bug_on when run fsstress with injecting IO fault: [130747.323114] kernel BUG at fs/ext4/extents_status.c:762! [130747.323117] Internal error: Oops - BUG: 0 [#1] SMP ...... [130747.334329] Call trace: [130747.334553] ext4_es_cache_extent+0x150/0x168 [ext4] [130747.334975] ext4_cache_extents+0x64/0xe8 [ext4] [130747.335368] ext4_find_extent+0x300/0x330 [ext4] [130747.335759] ext4_ext_map_blocks+0x74/0x1178 [ext4] [130747.336179] ext4_map_blocks+0x2f4/0x5f0 [ext4] [130747.336567] ext4_mpage_readpages+0x4a8/0x7a8 [ext4] [130747.336995] ext4_readpage+0x54/0x100 [ext4] [130747.337359] generic_file_buffered_read+0x410/0xae8 [130747.337767] generic_file_read_iter+0x114/0x190 [130747.338152] ext4_file_read_iter+0x5c/0x140 [ext4] [130747.338556] __vfs_read+0x11c/0x188 [130747.338851] vfs_read+0x94/0x150 [130747.339110] ksys_read+0x74/0xf0 This patch's modification is according to Jan Kara's suggestion in: https://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/ "I see. Now I understand your patch. Honestly, seeing how fragile is trying to fix extent tree after split has failed in the middle, I would probably go even further and make sure we fix the tree properly in case of ENOSPC and EDQUOT (those are easily user triggerable). Anything else indicates a HW problem or fs corruption so I'd rather leave the extent tree as is and don't try to fix it (which also means we will not create overlapping extents)."

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • adb2355104b2109e06ba5276485d187d023b2fd2 to < e33bafad30d34cfa5e9787cb099cab05e2677fcbaffected
  • adb2355104b2109e06ba5276485d187d023b2fd2 to < 5b3a9a2be59478b013a430ac57b0f3d65471b071affected
  • adb2355104b2109e06ba5276485d187d023b2fd2 to < d8116743ef5432336289256b2f7c117299213eb9affected
  • adb2355104b2109e06ba5276485d187d023b2fd2 to < 569496aa3776eea1ff0d49d0174ac1b7e861e107affected
  • adb2355104b2109e06ba5276485d187d023b2fd2 to < 920697b004e49cb026e2e15fe91be065bf0741b7affected
  • adb2355104b2109e06ba5276485d187d023b2fd2 to < d3b668b96ad3192c0581a248ae2f596cd054792aaffected
  • adb2355104b2109e06ba5276485d187d023b2fd2 to < 48105dc98c9ca35af418746277b087cb2bc6df7caffected
  • adb2355104b2109e06ba5276485d187d023b2fd2 to < 082cd4ec240b8734a82a89ffb890216ac98fec68affected

Linux Linux

Default version status: affected

  • 3.9affected
  • 0 to < 3.9unaffected
  • 4.4.272 to ≤ 4.4.*unaffected
  • 4.9.272 to ≤ 4.9.*unaffected
  • 4.14.236 to ≤ 4.14.*unaffected
  • 4.19.194 to ≤ 4.19.*unaffected
  • 5.4.125 to ≤ 5.4.*unaffected
  • 5.10.43 to ≤ 5.10.*unaffected
  • 5.12.10 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References