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CVE-2024-35849

btrfs: fix information leak in btrfs_ioctl_logical_to_ino()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.313, 5.4.275, 5.10.216, 5.15.158, 6.1.90, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in 689efe22e9b5b7d9d523119a9a5c3c17107a0772; From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in 73db209dcd4ae026021234d40cfcb2fb5b564b86; From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in 30189e54ba80e3209d34cfeea87b848f6ae025e6; From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in e58047553a4e859dafc8d1d901e1de77c9dd922d; From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in 8bdbcfaf3eac42f98e5486b3d7e130fa287811f6; From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in 3a63cee1a5e14a3e52c19142c61dd5fcb524f6dc; From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in fddc19631c51d9c17d43e9f822a7bc403af88d54; From a542ad1bafc7df9fc16de8a6894b350a4df75572 · fixed in 2f7ef5bb4a2f3e481ef05fab946edb97c84f67cf

  • Linux Linux

    3.2

  • KernelLinux

    From 3.2.0 · fixed in 4.19.313; From 4.20.0 · fixed in 5.4.275; From 5.5.0 · fixed in 5.10.216; From 5.11.0 · fixed in 5.15.158; From 5.16.0 · fixed in 6.1.90; From 6.2.0 · fixed in 6.6.30; From 6.7.0 · fixed in 6.8.9

References 8

git.kernel.org