CVE ID : CVE-2024-56665
Published : Dec. 27, 2024, 3:15 p.m. | 1 hour ago
Description : In the Linux kernel, the following vulnerability has been resolved:
bpf,perf: Fix invalid prog_array access in perf_event_detach_bpf_prog
Syzbot reported [1] crash that happens for following tracing scenario:
– create tracepoint perf event with attr.inherit=1, attach it to the
process and set bpf program to it
– attached process forks -> chid creates inherited event
the new child event shares the parent’s bpf program and tp_event
(hence prog_array) which is global for tracepoint
– exit both process and its child -> release both events
– first perf_event_detach_bpf_prog call will release tp_event->prog_array
and second perf_event_detach_bpf_prog will crash, because
tp_event->prog_array is NULL
The fix makes sure the perf_event_detach_bpf_prog checks prog_array
is valid before it tries to remove the bpf program from it.
[1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad
Severity: 0.0 | NA
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