Mikhail Zaslonko 44821d0586 zdump/dfo_elf: Include vmcoreinfo note size in ELF header allocation ...

dfo_elf_init() allocates the output ELF header buffer based on
HDR_BASE_SIZE, per-CPU note sizes, and per-memory-chunk overhead,
but does not account for the vmcoreinfo note. notes_init() then
writes the full vmcoreinfo string into the buffer via nt_vmcoreinfo(),
overflowing the heap allocation for any dump with a vmcoreinfo blob
larger than what fits in HDR_BASE_SIZE. The following ABORT check
fires after the heap was already corrupted.

Fix by extracting the allocation size calculation into a new
hdr_alloc_size() function that explicitly accounts for all items
written into the header buffer.
Remove the opaque HDR_BASE_SIZE and HDR_PER_MEMC_SIZE macros.

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2026-07-20 15:25:59 +02:00

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