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Change History

In the Linux kernel, the following vulnerability has been resolved:

libbpf: Prevent null-pointer dereference when prog to load has no BTF

In bpf_objec_load_prog(), there's no guarantee that obj->btf is non-NULL
when passing it to btf__fd(), and this function does not perform any
check before dereferencing its argument (as bpf_object__btf_fd() used to
do). As a consequence, we get segmentation fault errors in bpftool (for
example) when trying to load programs that come without BTF information.

kernel.org https://git.kernel.org/stable/c/1fd91360a75833b7110af9834ae26c977e1273e0 [No types assigned]

kernel.org https://git.kernel.org/stable/c/9bf48fa19a4b1d186e08b20bf7e5de26a15644fb [No types assigned]

kernel.org https://git.kernel.org/stable/c/ef80b59acfa4dee4b5eaccb15572b69248831104 [No types assigned]