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[v2,2/3] arm64: kprobes: Let arch do_page_fault() fix up page fault in user handler

Message ID 166994752269.439920.4801339965959400456.stgit@devnote3 (mailing list archive)
State New, archived
Headers show
Series arm64: kprobes: Fix bugs in kprobes for arm64 | expand

Commit Message

Masami Hiramatsu (Google) Dec. 2, 2022, 2:18 a.m. UTC 
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Since arm64's do_page_fault() can handle the page fault correctly
than kprobe_fault_handler() according to the context, let it handle
the page fault instead of simply call fixup_exception() in the
kprobe_fault_handler().

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
---
 arch/arm64/kernel/probes/kprobes.c |    8 --------
 1 file changed, 8 deletions(-)
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Patch

diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index c9e4d0720285..d2ae37f89774 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -294,14 +294,6 @@  int __kprobes kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr)
 		}
 
 		break;
-	case KPROBE_HIT_ACTIVE:
-	case KPROBE_HIT_SSDONE:
-		/*
-		 * In case the user-specified fault handler returned
-		 * zero, try to fix up.
-		 */
-		if (fixup_exception(regs))
-			return 1;
 	}
 	return 0;
 }