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uprobes: Flush cache after xol write

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

Signed-off-by: Rabin Vincent <rabin@rab.in>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
Rabin Vincent 2012-11-14 18:27:07 +01:00 committed by Oleg Nesterov
parent 19f5ee2716
commit 65b6ecc038
1 changed files with 5 additions and 0 deletions
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5
kernel/events/uprobes.c
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@ -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;
}