Hao Luo 34d3a78c68 bpf: Make per_cpu_ptr return rdonly PTR_TO_MEM. ... Tag the return type of {per, this}_cpu_ptr with RDONLY_MEM. The returned value of this pair of helpers is kernel object, which can not be updated by bpf programs. Previously these two helpers return PTR_OT_MEM for kernel objects of scalar type, which allows one to directly modify the memory. Now with RDONLY_MEM tagging, the verifier will reject programs that write into RDONLY_MEM. Fixes: 63d9b80dcf ("bpf: Introducte bpf_this_cpu_ptr()") Fixes: eaa6bcb71e ("bpf: Introduce bpf_per_cpu_ptr()") Fixes: 4976b718c3 ("bpf: Introduce pseudo_btf_id") Signed-off-by: Hao Luo <haoluo@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211217003152.48334-8-haoluo@google.com		2021-12-18 13:27:41 -08:00
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bpf	bpf: Make per_cpu_ptr return rdonly PTR_TO_MEM.	2021-12-18 13:27:41 -08:00
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