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-rw-r--r--kernel/events/uprobes.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index a1b466d..c718fef 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -596,6 +596,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
BUG_ON((uprobe->offset & ~PAGE_MASK) +
UPROBE_SWBP_INSN_SIZE > PAGE_SIZE);
+ smp_wmb(); /* pairs with rmb() in find_active_uprobe() */
uprobe->flags |= UPROBE_COPY_INSN;
}
@@ -1436,6 +1437,14 @@ static void handle_swbp(struct pt_regs *regs)
}
return;
}
+ /*
+ * TODO: move copy_insn/etc into _register and remove this hack.
+ * After we hit the bp, _unregister + _register can install the
+ * new and not-yet-analyzed uprobe at the same address, restart.
+ */
+ smp_rmb(); /* pairs with wmb() in install_breakpoint() */
+ if (unlikely(!(uprobe->flags & UPROBE_COPY_INSN)))
+ goto restart;
utask = current->utask;
if (!utask) {