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coredump: Only sort VMAs when core_sort_vma sysctl is set

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The sorting of VMAs by size in commit 7d442a33bf ("binfmt_elf: Dump
smaller VMAs first in ELF cores") breaks elfutils[1]. Instead, sort
based on the setting of the new sysctl, core_sort_vma, which defaults
to 0, no sorting.

Reported-by: Michael Stapelberg <michael@stapelberg.ch>
Closes: https://lore.kernel.org/all/20250218085407.61126-1-michael@stapelberg.de/ [1]
Fixes: 7d442a33bf ("binfmt_elf: Dump smaller VMAs first in ELF cores")
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook
2025-02-19 11:53:16 -08:00
parent a64dcfb451
commit 39ec9eaaa1
2 changed files with 24 additions and 2 deletions
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11
Documentation/admin-guide/sysctl/kernel.rst
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@@ -212,6 +212,17 @@ pid>/``).
This value defaults to 0.
core_sort_vma
=============
The default coredump writes VMAs in address order. By setting
``core_sort_vma`` to 1, VMAs will be written from smallest size
to largest size. This is known to break at least elfutils, but
can be handy when dealing with very large (and truncated)
coredumps where the more useful debugging details are included
in the smaller VMAs.
core_uses_pid
=============