Commits to address this are upstream in Linus' tree; they are:
1511df6f5e9e ("s390/bpf: Fix branch shortening during codegen pass")
6e61dc9da0b7 ("s390/bpf: Fix 64-bit subtraction of the -0x80000000 constant")
db7bee653859 ("s390/bpf: Fix optimizing out zero-extensions")
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https://bugs.launchpad.net/bugs/1943960
Title:
s390x BPF JIT vulnerabilities
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