diff options
| author | Jisheng Zhang <jszhang@kernel.org> | 2021-03-29 21:16:24 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2021-04-16 07:32:40 +0300 |
| commit | 7ae11635ec90072083503c6b6485cdffe46203b3 (patch) | |
| tree | f7914021e422b50549e819decdb5992901ebe276 /arch/riscv | |
| parent | e31be8d343e64e7ab17aef55c1d1b36dc504da67 (diff) | |
| download | linux-7ae11635ec90072083503c6b6485cdffe46203b3.tar.xz | |
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: c22b0bcb1dd0 ("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>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/kernel/entry.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 76274a4a1d8e..83095faa680e 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -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 |