CVE-2022-49796
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
01/05/2025
Last modified:
02/05/2025
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
tracing: kprobe: Fix potential null-ptr-deref on trace_array in kprobe_event_gen_test_exit()<br />
<br />
When test_gen_kprobe_cmd() failed after kprobe_event_gen_cmd_end(), it<br />
will goto delete, which will call kprobe_event_delete() and release the<br />
corresponding resource. However, the trace_array in gen_kretprobe_test<br />
will point to the invalid resource. Set gen_kretprobe_test to NULL<br />
after called kprobe_event_delete() to prevent null-ptr-deref.<br />
<br />
BUG: kernel NULL pointer dereference, address: 0000000000000070<br />
PGD 0 P4D 0<br />
Oops: 0000 [#1] SMP PTI<br />
CPU: 0 PID: 246 Comm: modprobe Tainted: G W<br />
6.1.0-rc1-00174-g9522dc5c87da-dirty #248<br />
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS<br />
rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014<br />
RIP: 0010:__ftrace_set_clr_event_nolock+0x53/0x1b0<br />
Code: e8 82 26 fc ff 49 8b 1e c7 44 24 0c ea ff ff ff 49 39 de 0f 84 3c<br />
01 00 00 c7 44 24 18 00 00 00 00 e8 61 26 fc ff 48 8b 6b 10 8b 65<br />
70 4c 8b 6d 18 41 f7 c4 00 02 00 00 75 2f<br />
RSP: 0018:ffffc9000159fe00 EFLAGS: 00010293<br />
RAX: 0000000000000000 RBX: ffff88810971d268 RCX: 0000000000000000<br />
RDX: ffff8881080be600 RSI: ffffffff811b48ff RDI: ffff88810971d058<br />
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001<br />
R10: ffffc9000159fe58 R11: 0000000000000001 R12: ffffffffa0001064<br />
R13: ffffffffa000106c R14: ffff88810971d238 R15: 0000000000000000<br />
FS: 00007f89eeff6540(0000) GS:ffff88813b600000(0000)<br />
knlGS:0000000000000000<br />
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br />
CR2: 0000000000000070 CR3: 000000010599e004 CR4: 0000000000330ef0<br />
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br />
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br />
Call Trace:<br />
<br />
__ftrace_set_clr_event+0x3e/0x60<br />
trace_array_set_clr_event+0x35/0x50<br />
? 0xffffffffa0000000<br />
kprobe_event_gen_test_exit+0xcd/0x10b [kprobe_event_gen_test]<br />
__x64_sys_delete_module+0x206/0x380<br />
? lockdep_hardirqs_on_prepare+0xd8/0x190<br />
? syscall_enter_from_user_mode+0x1c/0x50<br />
do_syscall_64+0x3f/0x90<br />
entry_SYSCALL_64_after_hwframe+0x63/0xcd<br />
RIP: 0033:0x7f89eeb061b7