2024-03-02 21:59:40
Linux
PUBLISHED
In the Linux kernel, the following vulnerability has been resolved:
vfio/mdev: Fix a null-ptr-deref bug for mdev_unregister_parent()
Inject fault while probing mdpy.ko, if kstrdup() of create_dir() fails in
kobject_add_internal() in kobject_init_and_add() in mdev_type_add()
in parent_create_sysfs_files(), it will return 0 and probe successfully.
And when rmmod mdpy.ko, the mdpy_dev_exit() will call
mdev_unregister_parent(), the mdev_type_remove() may traverse uninitialized
parent->types[i] in parent_remove_sysfs_files(), and it will cause
below null-ptr-deref.
If mdev_type_add() fails, return the error code and kset_unregister()
to fix the issue.
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 2 PID: 10215 Comm: rmmod Tainted: G W N 6.6.0-rc2+ #20
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:__kobject_del+0x62/0x1c0
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 51 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 28 48 8d 7d 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 24 01 00 00 48 8b 75 10 48 89 df 48 8d 6b 3c e8
RSP: 0018:ffff88810695fd30 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffffffa0270268 RCX: 0000000000000000
RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000010
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10233a4ef1
R10: ffff888119d2778b R11: 0000000063666572 R12: 0000000000000000
R13: fffffbfff404e2d4 R14: dffffc0000000000 R15: ffffffffa0271660
FS: 00007fbc81981540(0000) GS:ffff888119d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc14a142dc0 CR3: 0000000110a62003 CR4: 0000000000770ee0
DR0: ffffffff8fb0bce8 DR1: ffffffff8fb0bce9 DR2: ffffffff8fb0bcea
DR3: ffffffff8fb0bceb DR6: 00000000fffe0ff0 DR7: 0000000000000600
PKRU: 55555554
Call Trace: