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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-49879

ext4: fix BUG_ON() when directory entry has invalid rec_len

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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() when directory entry has invalid rec_len The rec_len field in the directory entry has to be a multiple of 4. A corrupted filesystem image can be used to hit a BUG() in ext4_rec_len_to_disk(), called from make_indexed_dir(). ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Call Trace: <TASK> ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The fix simply adds a call to ext4_check_dir_entry() to validate the directory entry, returning -EFSCORRUPTED if the entry is invalid.

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

  • 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 to < 2fa24d0274fbf913b56ee31f15bc01168669d909affected
  • 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 to < 156451a67b93986fb07c274ef6995ff40766c5adaffected
  • 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 to < 999cff2b6ce3b45c08abf793bf55534777421327affected
  • 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 to < ce1ee2c8827fb6493e91acbd50f664cf2a972c3daffected
  • 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 to < 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340affected

Linux Linux

Default version status: affected

  • 2.6.30affected
  • 0 to < 2.6.30unaffected
  • 5.4.224 to ≤ 5.4.*unaffected
  • 5.10.154 to ≤ 5.10.*unaffected
  • 5.15.78 to ≤ 5.15.*unaffected
  • 6.0.8 to ≤ 6.0.*unaffected
  • 6.1 to ≤ *unaffected

References