uprobes: deny mremap(xol_vma)

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kernel/events/uprobes.c assumes that xol_area->vaddr is always correct but
a malicious application can remap its "[uprobes]" vma to another adress to
confuse the kernel. Introduce xol_mremap() to make this impossible.

With this change utask->xol_vaddr in xol_free_insn_slot() can't be invalid,
we can turn the offset check into WARN_ON_ONCE(offset >= PAGE_SIZE).

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240929144258.GA9492@redhat.com

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Oleg Nesterov 2024-09-29 16:42:58 +02:00 • committed by Peter Zijlstra

parent c5356ab1db

commit c16e2fdd74

1 changed files with 17 additions and 13 deletions

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kernel/events/uprobes.c

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