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riscv: keep interrupts disabled for BREAKPOINT exception 

Current riscv's kprobe handlers are run with both preemption and
interrupt enabled, this violates kprobe requirements. Fix this issue
by keeping interrupts disabled for BREAKPOINT exception.

Fixes: c22b0bcb1d ("riscv: Add kprobes supported")
Cc: stable@vger.kernel.org
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
[Palmer: add a comment]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Jisheng Zhang 2021-03-30 02:16:24 +08:00 committed by Palmer Dabbelt
parent e31be8d343
commit 7ae11635ec
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1 changed files with 3 additions and 0 deletions
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3
arch/riscv/kernel/entry.S
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@ -130,6 +130,9 @@ skip_context_tracking:
*/
andi t0, s1, SR_PIE
beqz t0, 1f
/* kprobes, entered via ebreak, must have interrupts disabled. */
li t0, EXC_BREAKPOINT
beq s4, t0, 1f
#ifdef CONFIG_TRACE_IRQFLAGS
call trace_hardirqs_on
#endif