bpf: bpf_probe_read_kernel_str() has to return amount of data read on success
During recent refactorings, bpf_probe_read_kernel_str() started returning 0 on success, instead of amount of data successfully read. This majorly breaks applications relying on bpf_probe_read_kernel_str() and bpf_probe_read_str() and their results. Fix this by returning actual number of bytes read. Fixes: 8d92db5c ("bpf: rework the compat kernel probe handling") Signed-off-by:Andrii Nakryiko <andriin@fb.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Reviewed-by:
Christoph Hellwig <hch@lst.de> Acked-by:
John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20200616050432.1902042-1-andriin@fb.com
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