nati_x86_64_defconfig: Enable CORE_DUMP_DEFAULT_ELF_HEADERS

[chaitu236]

Enable CORE_DUMP_DEFAULT_ELF_HEADERS so core files contain build-id which is useful during debugging.

It is possible to configure this dynamically this seems like a useful setting so thought it'd be better to bake into kernel.

Testing

• Built kernel
• Booted on an VM and verified that core files generated with gcore <pid> contain build-ids.

# eu-unstrip -n --core core.2131
0x400000+0xc000 ee19d71a236f5eef544d31932c4b493a9c6a9bd9@0x400378 . - /bin/sleep.coreutils
0x7f5665b7f000+0x2000 f44a0666d2349d5fbd935f441399e7654b858dd2@0x7f5665b7f570 . - linux-vdso.so.1
0x7f5665b81000+0x365d8 0d169f0bcd80370ed631ac306e3f791f944b9e9d@0x7f5665b812f8 /lib/ld-linux-x86-64.so.2 - ld-linux-x86-64.so.2
0x7f566598e000+0x1e5db0 4e6ba54d4a1fa41a8c20234938fff8fe8cf549cb@0x7f566598e3a0 /lib/libc.so.6 - libc.so.6

Without this change, this is what it looked like

# eu-unstrip -n --core core.32613
0x7f85fd796000+0x2000 5fbfd551ef8c8e65f543acbd558a8b372a31a485@0x7f85fd796588 . - linux-vdso.so

Note

I noticed about 2MB increase in core file size.
core file for /bin/sleep increased from 420KB to 2.5MB and for niauth_daemon, it went from 388MB to 390MB.

bzImage size increased from 7087104 bytes to 7095296 bytes (about 8KB).

I'll create PRs for 6.18 and 4.14 if this change is acceptable.

[Copilot]

Pull request overview

This PR updates the nati_x86_64_defconfig to enable CORE_DUMP_DEFAULT_ELF_HEADERS so generated ELF core dumps include partial ELF headers (including build-id information), improving post-mortem/debug symbol resolution.

Changes:

• Removes the explicit # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set line from the defconfig, allowing the Kconfig default (default y when BINFMT_ELF && ELF_CORE) to take effect.

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