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bpf: disable preemption for bpf progs attached to uprobe 

trace_call_bpf() no longer disables preemption on its own.
All callers of this function has to do it explicitly.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Alexei Starovoitov 2020-02-24 11:27:15 -08:00
parent 1b7a51a63b
commit 70ed0706a4
1 changed files with 9 additions and 2 deletions
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11
kernel/trace/trace_uprobe.c
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@ -1333,8 +1333,15 @@ static void __uprobe_perf_func(struct trace_uprobe *tu,
int size, esize; int size, esize;
int rctx; int rctx;
if (bpf_prog_array_valid(call) && !trace_call_bpf(call, regs)) if (bpf_prog_array_valid(call)) {
return; u32 ret;
preempt_disable();
ret = trace_call_bpf(call, regs);
preempt_enable();
if (!ret)
return;
}
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));