libbpf: Set MFD_NOEXEC_SEAL when creating memfd #8298
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Since 105ff53 ("mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC"), the kernel has started printing a warning if neither MFD_NOEXEC_SEAL nor MFD_EXEC is set in memfd_create(). To avoid this warning (and also be more secure), set MFD_NOEXEC_SEAL by default. But since libbpf can be running on potentially very old kernels, leave a fallback for kernels without MFD_NOEXEC_SEAL support.
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Since 105ff53 ("mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC"), the kernel has started printing a warning if neither MFD_NOEXEC_SEAL nor MFD_EXEC is set in memfd_create().
To avoid this warning (and also be more secure), set MFD_NOEXEC_SEAL by default. But since libbpf can be running on potentially very old kernels, leave a fallback for kernels without MFD_NOEXEC_SEAL support.