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bpf: bpf_probe_read_kernel_str() has to return amount of data read on success

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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: 8d92db5c04 ("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
This commit is contained in:
Andrii Nakryiko 2020-06-15 22:04:30 -07:00 committed by Daniel Borkmann
parent 6903cdae9f
commit 02553b91da
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/bpf_trace.c
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@ -241,7 +241,7 @@ bpf_probe_read_kernel_str_common(void *dst, u32 size, const void *unsafe_ptr)
if (unlikely(ret < 0))
goto fail;
return 0;
return ret;
fail:
memset(dst, 0, size);
return ret;