elf: Apply same kern_version.SUBLEVEL clamping as done by kernel #309
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When SUBLEVEL of the kernel version approaches 255, it is clamped to 255 to avoid impacting the PATCHLEVEL. This is introduced in different versions depending on the branch. For example, for 4.19 kernel see the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a256aac5b7000 In order to avoid failing the kernel version check in the BPF syscall, the library must apply the same clamping. Signed-off-by: David Verbeiren <[email protected]>
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ELF BPF module loading is failing on kernel 4.19.222 (and probably similar fails on 4.14.252) because of the clamping done on the kern_version SUBLEVEL value (clamped to 255 starting at 222). The library must do the same in order to avoid failing the kernel version check in the BPF syscall.