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riscv: keep interrupts disabled for BREAKPOINT exception

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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