Comments (4)
It's a generally recognized (in the BPF community) problem. To quote Alexei Starovoitov:
we brought this issue [the brittle nature of optimizations in conjunction with the verifier] to llvm folks many times. Unfortunately to deaf ears. GCC folks are more accommodating. The plan is to have -Overifiable flag that will turn off optimizations that lose information. Once GCC leads the way maybe clang folks will start listening. afaik llvm community lost a bunch of great engineers to AI projects and that shows.
from libbpf-bootstrap.
It's a generally recognized (in the BPF community) problem. To quote Alexei Starovoitov:
we brought this issue [the brittle nature of optimizations in conjunction with the verifier] to llvm folks many times. Unfortunately to deaf ears. GCC folks are more accommodating. The plan is to have -Overifiable flag that will turn off optimizations that lose information. Once GCC leads the way maybe clang folks will start listening. afaik llvm community lost a bunch of great engineers to AI projects and that shows.
Are there any best practices to avoid these problems as much as possible? I tried to look for this information on the Internet, but I couldn't find it.
from libbpf-bootstrap.
Are there any best practices to avoid these problems as much as possible? I tried to look for this information on the Internet, but I couldn't find it.
Not aware of any. Others may know more, though.
from libbpf-bootstrap.
try storing *offset
result in local variable and then check that it is within correct range. And then use that local variable instead of dereferencing *offset
again in bt->buf[*offset]
from libbpf-bootstrap.
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