CVE-2024-35849 (GCVE-0-2024-35849)

Vulnerability from cvelistv5 – Published: 2024-05-17 14:47 – Updated: 2026-01-05 10:35
VLAI?
Title
btrfs: fix information leak in btrfs_ioctl_logical_to_ino()
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix information leak in btrfs_ioctl_logical_to_ino() Syzbot reported the following information leak for in btrfs_ioctl_logical_to_ino(): BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x110 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _copy_to_user+0xbc/0x110 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [inline] btrfs_ioctl_logical_to_ino+0x440/0x750 fs/btrfs/ioctl.c:3499 btrfs_ioctl+0x714/0x1260 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __kmalloc_large_node+0x231/0x370 mm/slub.c:3921 __do_kmalloc_node mm/slub.c:3954 [inline] __kmalloc_node+0xb07/0x1060 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0xc0/0x2d0 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] init_data_container+0x49/0x1e0 fs/btrfs/backref.c:2779 btrfs_ioctl_logical_to_ino+0x17c/0x750 fs/btrfs/ioctl.c:3480 btrfs_ioctl+0x714/0x1260 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Bytes 40-65535 of 65536 are uninitialized Memory access of size 65536 starts at ffff888045a40000 This happens, because we're copying a 'struct btrfs_data_container' back to user-space. This btrfs_data_container is allocated in 'init_data_container()' via kvmalloc(), which does not zero-fill the memory. Fix this by using kvzalloc() which zeroes out the memory on allocation.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < 689efe22e9b5b7d9d523119a9a5c3c17107a0772 (git)
Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < 73db209dcd4ae026021234d40cfcb2fb5b564b86 (git)
Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < 30189e54ba80e3209d34cfeea87b848f6ae025e6 (git)
Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < e58047553a4e859dafc8d1d901e1de77c9dd922d (git)
Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < 8bdbcfaf3eac42f98e5486b3d7e130fa287811f6 (git)
Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < 3a63cee1a5e14a3e52c19142c61dd5fcb524f6dc (git)
Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < fddc19631c51d9c17d43e9f822a7bc403af88d54 (git)
Affected: a542ad1bafc7df9fc16de8a6894b350a4df75572 , < 2f7ef5bb4a2f3e481ef05fab946edb97c84f67cf (git)
Create a notification for this product.
    Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 4.19.313 , ≤ 4.19.* (semver)
Unaffected: 5.4.275 , ≤ 5.4.* (semver)
Unaffected: 5.10.216 , ≤ 5.10.* (semver)
Unaffected: 5.15.158 , ≤ 5.15.* (semver)
Unaffected: 6.1.90 , ≤ 6.1.* (semver)
Unaffected: 6.6.30 , ≤ 6.6.* (semver)
Unaffected: 6.8.9 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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btrfs_ioctl_logical_to_ino()\\n\\nSyzbot reported the following information leak for in\\nbtrfs_ioctl_logical_to_ino():\\n\\n  BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]\\n  BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x110 lib/usercopy.c:40\\n   instrument_copy_to_user include/linux/instrumented.h:114 [inline]\\n   _copy_to_user+0xbc/0x110 lib/usercopy.c:40\\n   copy_to_user include/linux/uaccess.h:191 [inline]\\n   btrfs_ioctl_logical_to_ino+0x440/0x750 fs/btrfs/ioctl.c:3499\\n   btrfs_ioctl+0x714/0x1260\\n   vfs_ioctl fs/ioctl.c:51 [inline]\\n   __do_sys_ioctl fs/ioctl.c:904 [inline]\\n   __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890\\n   __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890\\n   x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17\\n   do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n   do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\n  Uninit was created at:\\n   __kmalloc_large_node+0x231/0x370 mm/slub.c:3921\\n   __do_kmalloc_node mm/slub.c:3954 [inline]\\n   __kmalloc_node+0xb07/0x1060 mm/slub.c:3973\\n   kmalloc_node include/linux/slab.h:648 [inline]\\n   kvmalloc_node+0xc0/0x2d0 mm/util.c:634\\n   kvmalloc include/linux/slab.h:766 [inline]\\n   init_data_container+0x49/0x1e0 fs/btrfs/backref.c:2779\\n   btrfs_ioctl_logical_to_ino+0x17c/0x750 fs/btrfs/ioctl.c:3480\\n   btrfs_ioctl+0x714/0x1260\\n   vfs_ioctl fs/ioctl.c:51 [inline]\\n   __do_sys_ioctl fs/ioctl.c:904 [inline]\\n   __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890\\n   __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890\\n   x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17\\n   do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n   do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\n  Bytes 40-65535 of 65536 are uninitialized\\n  Memory access of size 65536 starts at ffff888045a40000\\n\\nThis happens, because we\u0027re copying a \u0027struct btrfs_data_container\u0027 back\\nto user-space. This btrfs_data_container is allocated in\\n\u0027init_data_container()\u0027 via kvmalloc(), which does not zero-fill the\\nmemory.\\n\\nFix this by using kvzalloc() which zeroes out the memory on allocation.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.313\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.275\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.216\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.158\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.90\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.30\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.9\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"3.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:35:25.159Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35849\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:35:25.159Z\", \"dateReserved\": \"2024-05-17T13:50:33.105Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T14:47:27.486Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.