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authorOleg Nesterov2013-10-16 19:39:37 +0200
committerOleg Nesterov2013-10-29 18:02:55 +0100
commit3ab679661721b1ec2aaad99a801870ed59ab1110 (patch)
treef651a01eb98dd5454d433da9ae35579242a2cb36 /net/netlabel
parentaa59c53fd4599c91ccf9629af0c2777b89929076 (diff)
uprobes: Teach uprobe_copy_process() to handle CLONE_VFORK
uprobe_copy_process() does nothing if the child shares ->mm with the forking process, but there is a special case: CLONE_VFORK. In this case it would be more correct to do dup_utask() but avoid dup_xol(). This is not that important, the child should not unwind its stack too much, this can corrupt the parent's stack, but at least we need this to allow to ret-probe __vfork() itself. Note: in theory, it would be better to check task_pt_regs(p)->sp instead of CLONE_VFORK, we need to dup_utask() if and only if the child can return from the function called by the parent. But this needs the arch-dependant helper, and I think that nobody actually does clone(same_stack, CLONE_VM). Reported-by: Martin Cermak <mcermak@redhat.com> Reported-by: David Smith <dsmith@redhat.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
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