CVE-2024-26868 (GCVE-0-2024-26868)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2025-05-04 08:58
VLAI?
Title
nfs: fix panic when nfs4_ff_layout_prepare_ds() fails
Summary
In the Linux kernel, the following vulnerability has been resolved: nfs: fix panic when nfs4_ff_layout_prepare_ds() fails We've been seeing the following panic in production BUG: kernel NULL pointer dereference, address: 0000000000000065 PGD 2f485f067 P4D 2f485f067 PUD 2cc5d8067 PMD 0 RIP: 0010:ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles] Call Trace: <TASK> ? __die+0x78/0xc0 ? page_fault_oops+0x286/0x380 ? __rpc_execute+0x2c3/0x470 [sunrpc] ? rpc_new_task+0x42/0x1c0 [sunrpc] ? exc_page_fault+0x5d/0x110 ? asm_exc_page_fault+0x22/0x30 ? ff_layout_free_layoutreturn+0x110/0x110 [nfs_layout_flexfiles] ? ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles] ? ff_layout_cancel_io+0x6f/0x90 [nfs_layout_flexfiles] pnfs_mark_matching_lsegs_return+0x1b0/0x360 [nfsv4] pnfs_error_mark_layout_for_return+0x9e/0x110 [nfsv4] ? ff_layout_send_layouterror+0x50/0x160 [nfs_layout_flexfiles] nfs4_ff_layout_prepare_ds+0x11f/0x290 [nfs_layout_flexfiles] ff_layout_pg_init_write+0xf0/0x1f0 [nfs_layout_flexfiles] __nfs_pageio_add_request+0x154/0x6c0 [nfs] nfs_pageio_add_request+0x26b/0x380 [nfs] nfs_do_writepage+0x111/0x1e0 [nfs] nfs_writepages_callback+0xf/0x30 [nfs] write_cache_pages+0x17f/0x380 ? nfs_pageio_init_write+0x50/0x50 [nfs] ? nfs_writepages+0x6d/0x210 [nfs] ? nfs_writepages+0x6d/0x210 [nfs] nfs_writepages+0x125/0x210 [nfs] do_writepages+0x67/0x220 ? generic_perform_write+0x14b/0x210 filemap_fdatawrite_wbc+0x5b/0x80 file_write_and_wait_range+0x6d/0xc0 nfs_file_fsync+0x81/0x170 [nfs] ? nfs_file_mmap+0x60/0x60 [nfs] __x64_sys_fsync+0x53/0x90 do_syscall_64+0x3d/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Inspecting the core with drgn I was able to pull this >>> prog.crashed_thread().stack_trace()[0] #0 at 0xffffffffa079657a (ff_layout_cancel_io+0x3a/0x84) in ff_layout_cancel_io at fs/nfs/flexfilelayout/flexfilelayout.c:2021:27 >>> prog.crashed_thread().stack_trace()[0]['idx'] (u32)1 >>> prog.crashed_thread().stack_trace()[0]['flseg'].mirror_array[1].mirror_ds (struct nfs4_ff_layout_ds *)0xffffffffffffffed This is clear from the stack trace, we call nfs4_ff_layout_prepare_ds() which could error out initializing the mirror_ds, and then we go to clean it all up and our check is only for if (!mirror->mirror_ds). This is inconsistent with the rest of the users of mirror_ds, which have if (IS_ERR_OR_NULL(mirror_ds)) to keep from tripping over this exact scenario. Fix this up in ff_layout_cancel_io() to make sure we don't panic when we get an error. I also spot checked all the other instances of checking mirror_ds and we appear to be doing the correct checks everywhere, only unconditionally dereferencing mirror_ds when we know it would be valid.
Severity ?
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 31db25e3141b20e2a76a9f219eeca52e3cab126c (git)
Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5 (git)
Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 5ada9016b1217498fad876a3d5b07645cc955608 (git)
Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < dac068f164ad05b35e7c0be13f138c3f6adca58f (git)
Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 719fcafe07c12646691bd62d7f8d94d657fa0766 (git)
Create a notification for this product.
    Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.83 , ≤ 6.1.* (semver)
Unaffected: 6.6.23 , ≤ 6.6.* (semver)
Unaffected: 6.7.11 , ≤ 6.7.* (semver)
Unaffected: 6.8.2 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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Show details on NVD website

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    "vulnrichment": {
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__die+0x78/0xc0\\n ? page_fault_oops+0x286/0x380\\n ? __rpc_execute+0x2c3/0x470 [sunrpc]\\n ? rpc_new_task+0x42/0x1c0 [sunrpc]\\n ? exc_page_fault+0x5d/0x110\\n ? asm_exc_page_fault+0x22/0x30\\n ? ff_layout_free_layoutreturn+0x110/0x110 [nfs_layout_flexfiles]\\n ? ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles]\\n ? ff_layout_cancel_io+0x6f/0x90 [nfs_layout_flexfiles]\\n pnfs_mark_matching_lsegs_return+0x1b0/0x360 [nfsv4]\\n pnfs_error_mark_layout_for_return+0x9e/0x110 [nfsv4]\\n ? ff_layout_send_layouterror+0x50/0x160 [nfs_layout_flexfiles]\\n nfs4_ff_layout_prepare_ds+0x11f/0x290 [nfs_layout_flexfiles]\\n ff_layout_pg_init_write+0xf0/0x1f0 [nfs_layout_flexfiles]\\n __nfs_pageio_add_request+0x154/0x6c0 [nfs]\\n nfs_pageio_add_request+0x26b/0x380 [nfs]\\n nfs_do_writepage+0x111/0x1e0 [nfs]\\n nfs_writepages_callback+0xf/0x30 [nfs]\\n write_cache_pages+0x17f/0x380\\n ? nfs_pageio_init_write+0x50/0x50 [nfs]\\n ? nfs_writepages+0x6d/0x210 [nfs]\\n ? nfs_writepages+0x6d/0x210 [nfs]\\n nfs_writepages+0x125/0x210 [nfs]\\n do_writepages+0x67/0x220\\n ? generic_perform_write+0x14b/0x210\\n filemap_fdatawrite_wbc+0x5b/0x80\\n file_write_and_wait_range+0x6d/0xc0\\n nfs_file_fsync+0x81/0x170 [nfs]\\n ? nfs_file_mmap+0x60/0x60 [nfs]\\n __x64_sys_fsync+0x53/0x90\\n do_syscall_64+0x3d/0x90\\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\\n\\nInspecting the core with drgn I was able to pull this\\n\\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0]\\n  #0 at 0xffffffffa079657a (ff_layout_cancel_io+0x3a/0x84) in ff_layout_cancel_io at fs/nfs/flexfilelayout/flexfilelayout.c:2021:27\\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0][\u0027idx\u0027]\\n  (u32)1\\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0][\u0027flseg\u0027].mirror_array[1].mirror_ds\\n  (struct nfs4_ff_layout_ds *)0xffffffffffffffed\\n\\nThis is clear from the stack trace, we call nfs4_ff_layout_prepare_ds()\\nwhich could error out initializing the mirror_ds, and then we go to\\nclean it all up and our check is only for if (!mirror-\u003emirror_ds).  This\\nis inconsistent with the rest of the users of mirror_ds, which have\\n\\n  if (IS_ERR_OR_NULL(mirror_ds))\\n\\nto keep from tripping over this exact scenario.  Fix this up in\\nff_layout_cancel_io() to make sure we don\u0027t panic when we get an error.\\nI also spot checked all the other instances of checking mirror_ds and we\\nappear to be doing the correct checks everywhere, only unconditionally\\ndereferencing mirror_ds when we know it would be valid.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:49:03.131Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26868\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:49:03.131Z\", \"dateReserved\": \"2024-02-19T14:20:24.184Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:27:29.431Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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