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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-35849

btrfs: fix information leak in btrfs_ioctl_logical_to_ino()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

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

  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < 689efe22e9b5b7d9d523119a9a5c3c17107a0772affected
  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < 73db209dcd4ae026021234d40cfcb2fb5b564b86affected
  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < 30189e54ba80e3209d34cfeea87b848f6ae025e6affected
  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < e58047553a4e859dafc8d1d901e1de77c9dd922daffected
  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < 8bdbcfaf3eac42f98e5486b3d7e130fa287811f6affected
  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < 3a63cee1a5e14a3e52c19142c61dd5fcb524f6dcaffected
  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < fddc19631c51d9c17d43e9f822a7bc403af88d54affected
  • a542ad1bafc7df9fc16de8a6894b350a4df75572 to < 2f7ef5bb4a2f3e481ef05fab946edb97c84f67cfaffected

Linux Linux

Default version status: affected

  • 3.2affected
  • 0 to < 3.2unaffected
  • 4.19.313 to ≤ 4.19.*unaffected
  • 5.4.275 to ≤ 5.4.*unaffected
  • 5.10.216 to ≤ 5.10.*unaffected
  • 5.15.158 to ≤ 5.15.*unaffected
  • 6.1.90 to ≤ 6.1.*unaffected
  • 6.6.30 to ≤ 6.6.*unaffected
  • 6.8.9 to ≤ 6.8.*unaffected
  • 6.9 to ≤ *unaffected

References