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032ce1ea94
The GNU coreutils version of truncate, which is the original, accepts a % prefix for the -s size argument which means the file in question should be padded to a multiple of the given size. This is currently used to pad the setup block of bzImage to a multiple of 4k before appending the decompressor. busybox reimplements truncate but does not support this idiom, and therefore fails the build since commit9c54baab44("x86/boot: Drop CRC-32 checksum and the build tool that generates it") Since very little build code within the kernel depends on the 'truncate' utility, work around this incompatibility by avoiding truncate altogether, and relying on dd to perform the padding. Fixes:9c54baab44("x86/boot: Drop CRC-32 checksum and the build tool that generates it") Reported-by: <phasta@kernel.org> Tested-by: Philipp Stanner <phasta@kernel.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20250424101917.1552527-2-ardb+git@google.com