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authorJisheng Zhang <jszhang@kernel.org>2021-03-29 21:16:24 +0300
committerPalmer Dabbelt <palmerdabbelt@google.com>2021-04-16 07:32:40 +0300
commit7ae11635ec90072083503c6b6485cdffe46203b3 (patch)
treef7914021e422b50549e819decdb5992901ebe276 /arch/riscv
parente31be8d343e64e7ab17aef55c1d1b36dc504da67 (diff)
downloadlinux-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.S3
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