CVE-2022-48631 (GCVE-0-2022-48631)
Vulnerability from cvelistv5
Published
2024-04-28 12:59
Modified
2025-12-23 13:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0 When walking through an inode extents, the ext4_ext_binsearch_idx() function assumes that the extent header has been previously validated. However, there are no checks that verify that the number of entries (eh->eh_entries) is non-zero when depth is > 0. And this will lead to problems because the EXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this: [ 135.245946] ------------[ cut here ]------------ [ 135.247579] kernel BUG at fs/ext4/extents.c:2258! [ 135.249045] invalid opcode: 0000 [#1] PREEMPT SMP [ 135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4 [ 135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014 [ 135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0 [ 135.256475] Code: [ 135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246 [ 135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023 [ 135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c [ 135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c [ 135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024 [ 135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000 [ 135.272394] FS: 00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 [ 135.274510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0 [ 135.277952] Call Trace: [ 135.278635] <TASK> [ 135.279247] ? preempt_count_add+0x6d/0xa0 [ 135.280358] ? percpu_counter_add_batch+0x55/0xb0 [ 135.281612] ? _raw_read_unlock+0x18/0x30 [ 135.282704] ext4_map_blocks+0x294/0x5a0 [ 135.283745] ? xa_load+0x6f/0xa0 [ 135.284562] ext4_mpage_readpages+0x3d6/0x770 [ 135.285646] read_pages+0x67/0x1d0 [ 135.286492] ? folio_add_lru+0x51/0x80 [ 135.287441] page_cache_ra_unbounded+0x124/0x170 [ 135.288510] filemap_get_pages+0x23d/0x5a0 [ 135.289457] ? path_openat+0xa72/0xdd0 [ 135.290332] filemap_read+0xbf/0x300 [ 135.291158] ? _raw_spin_lock_irqsave+0x17/0x40 [ 135.292192] new_sync_read+0x103/0x170 [ 135.293014] vfs_read+0x15d/0x180 [ 135.293745] ksys_read+0xa1/0xe0 [ 135.294461] do_syscall_64+0x3c/0x80 [ 135.295284] entry_SYSCALL_64_after_hwframe+0x46/0xb0 This patch simply adds an extra check in __ext4_ext_check(), verifying that eh_entries is not 0 when eh_depth is > 0.
References
Impacted products
Vendor Product Version
Linux Linux Version: c29c0ae7f282828da3695167ed870131798348d9
Version: c29c0ae7f282828da3695167ed870131798348d9
Version: c29c0ae7f282828da3695167ed870131798348d9
Version: c29c0ae7f282828da3695167ed870131798348d9
Version: c29c0ae7f282828da3695167ed870131798348d9
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However, there\\nare no checks that verify that the number of entries (eh-\u003eeh_entries) is\\nnon-zero when depth is \u003e 0.  And this will lead to problems because the\\nEXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:\\n\\n[  135.245946] ------------[ cut here ]------------\\n[  135.247579] kernel BUG at fs/ext4/extents.c:2258!\\n[  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP\\n[  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4\\n[  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\\n[  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0\\n[  135.256475] Code:\\n[  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246\\n[  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023\\n[  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c\\n[  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c\\n[  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024\\n[  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000\\n[  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\\n[  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0\\n[  135.277952] Call Trace:\\n[  135.278635]  \u003cTASK\u003e\\n[  135.279247]  ? preempt_count_add+0x6d/0xa0\\n[  135.280358]  ? percpu_counter_add_batch+0x55/0xb0\\n[  135.281612]  ? _raw_read_unlock+0x18/0x30\\n[  135.282704]  ext4_map_blocks+0x294/0x5a0\\n[  135.283745]  ? xa_load+0x6f/0xa0\\n[  135.284562]  ext4_mpage_readpages+0x3d6/0x770\\n[  135.285646]  read_pages+0x67/0x1d0\\n[  135.286492]  ? folio_add_lru+0x51/0x80\\n[  135.287441]  page_cache_ra_unbounded+0x124/0x170\\n[  135.288510]  filemap_get_pages+0x23d/0x5a0\\n[  135.289457]  ? path_openat+0xa72/0xdd0\\n[  135.290332]  filemap_read+0xbf/0x300\\n[  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40\\n[  135.292192]  new_sync_read+0x103/0x170\\n[  135.293014]  vfs_read+0x15d/0x180\\n[  135.293745]  ksys_read+0xa1/0xe0\\n[  135.294461]  do_syscall_64+0x3c/0x80\\n[  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0\\n\\nThis patch simply adds an extra check in __ext4_ext_check(), verifying that\\neh_entries is not 0 when eh_depth is \u003e 0.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.215\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.146\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.71\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19.12\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0\", \"versionStartIncluding\": \"2.6.23\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-23T13:19:49.121Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48631\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-23T13:19:49.121Z\", \"dateReserved\": \"2024-02-25T13:44:28.315Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-28T12:59:06.569Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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