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Commit 65b6ecc0 authored by Rabin Vincent's avatar Rabin Vincent Committed by Oleg Nesterov
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uprobes: Flush cache after xol write 



Flush the cache so that the instructions written to the XOL area are
visible.

Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
Acked-by: default avatarAnanth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
parent 19f5ee27

kernel/events/uprobes.c

+5 −0
Original line number Diff line number Diff line
@@ -1199,6 +1199,11 @@ static unsigned long xol_get_insn_slot(struct uprobe *uprobe, unsigned long slot 
	vaddr = kmap_atomic(area->page);

	memcpy(vaddr + offset, uprobe->arch.insn, MAX_UINSN_BYTES);

	kunmap_atomic(vaddr);

	/*

	 * We probably need flush_icache_user_range() but it needs vma.

	 * This should work on supported architectures too.

	 */

	flush_dcache_page(area->page);



	return current->utask->xol_vaddr;

}