linux-hardening - [PATCH] ARM: fault: Add "cut here" line for prefetch aborts

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Message-Id: <20240123011211.work.227-kees@kernel.org>
Date: Mon, 22 Jan 2024 17:12:15 -0800
From: Kees Cook <keescook@...omium.org>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: Kees Cook <keescook@...omium.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Wang Kefeng <wangkefeng.wang@...wei.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@...linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] ARM: fault: Add "cut here" line for prefetch aborts

The common pattern in arm is to emit a "8<--- cut here ---" line for
faults, but it was missing for do_PrefetchAbort(). Add it.

Cc: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Wang Kefeng <wangkefeng.wang@...wei.com>
Cc: Ben Hutchings <ben@...adent.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/arm/mm/fault.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index e96fb40b9cc3..e804432e905e 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -586,6 +586,7 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
 	if (!inf->fn(addr, ifsr | FSR_LNX_PF, regs))
 		return;
 
+	pr_alert("8<--- cut here ---\n");
 	pr_alert("Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n",
 		inf->name, ifsr, addr);
 
-- 
2.34.1