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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-50478

nilfs2: fix shift-out-of-bounds/overflow in nilfs_sb2_bad_offset()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix shift-out-of-bounds/overflow in nilfs_sb2_bad_offset() Patch series "nilfs2: fix UBSAN shift-out-of-bounds warnings on mount time". The first patch fixes a bug reported by syzbot, and the second one fixes the remaining bug of the same kind. Although they are triggered by the same super block data anomaly, I divided it into the above two because the details of the issues and how to fix it are different. Both are required to eliminate the shift-out-of-bounds issues at mount time. This patch (of 2): If the block size exponent information written in an on-disk superblock is corrupted, nilfs_sb2_bad_offset helper function can trigger shift-out-of-bounds warning followed by a kernel panic (if panic_on_warn is set): shift exponent 38983 is too large for 64-bit type 'unsigned long long' Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322 nilfs_sb2_bad_offset fs/nilfs2/the_nilfs.c:449 [inline] nilfs_load_super_block+0xdf5/0xe00 fs/nilfs2/the_nilfs.c:523 init_nilfs+0xb7/0x7d0 fs/nilfs2/the_nilfs.c:577 nilfs_fill_super+0xb1/0x5d0 fs/nilfs2/super.c:1047 nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317 ... In addition, since nilfs_sb2_bad_offset() performs multiplication without considering the upper bound, the computation may overflow if the disk layout parameters are not normal. This fixes these issues by inserting preliminary sanity checks for those parameters and by converting the comparison from one involving multiplication and left bit-shifting to one using division and right bit-shifting.

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

  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < 6b0ea3df56cccd53398d0289f399f19d43136b2eaffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < a6f89b10042baca218c8598d6db5a44c7e32625faffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < 9b3ba54025357440d6c4414c670984f628c6f6bfaffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < d706485dffbbbf848e681edda29c7a46ac55698caffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < d464b035c0613856d012cf1704879d3ff3f057fbaffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < b47f5c579c8186f7f5ab5e4254e0734ea5b7bf7aaffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < 1012ff77284e3bec0ec0a35a820b03ec43dec2ccaffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < 62d11ec205ef14d8acf172cfc9904fdbf200025aaffected
  • e339ad31f59925b48a92ee3947692fdf9758b8c7 to < 610a2a3d7d8be3537458a378ec69396a76c385b6affected

Linux Linux

Default version status: affected

  • 2.6.30affected
  • 0 to < 2.6.30unaffected
  • 4.9.337 to ≤ 4.9.*unaffected
  • 4.14.303 to ≤ 4.14.*unaffected
  • 4.19.270 to ≤ 4.19.*unaffected
  • 5.4.229 to ≤ 5.4.*unaffected
  • 5.10.163 to ≤ 5.10.*unaffected
  • 5.15.86 to ≤ 5.15.*unaffected
  • 6.0.16 to ≤ 6.0.*unaffected
  • 6.1.2 to ≤ 6.1.*unaffected
  • 6.2 to ≤ *unaffected

References