linux-hardening - [PATCH 2/4] ubsan: Remove regs from report_ubsan

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Message-ID: <20250416180440.231949-3-smostafa@google.com>
Date: Wed, 16 Apr 2025 18:04:32 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: kvmarm@...ts.linux.dev, kasan-dev@...glegroups.com, 
	linux-hardening@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: will@...nel.org, maz@...nel.org, oliver.upton@...ux.dev, 
	broonie@...nel.org, catalin.marinas@....com, tglx@...utronix.de, 
	mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, 
	hpa@...or.com, kees@...nel.org, elver@...gle.com, andreyknvl@...il.com, 
	ryabinin.a.a@...il.com, akpm@...ux-foundation.org, yuzenghui@...wei.com, 
	suzuki.poulose@....com, joey.gouly@....com, masahiroy@...nel.org, 
	nathan@...nel.org, nicolas.schier@...ux.dev, 
	Mostafa Saleh <smostafa@...gle.com>
Subject: [PATCH 2/4] ubsan: Remove regs from report_ubsan_failure()

report_ubsan_failure() doesn't use argument regs, and soon it will
be called from the hypervisor context were regs are not available.
So, remove the unused argument.

Signed-off-by: Mostafa Saleh <smostafa@...gle.com>
---
 arch/arm64/kernel/traps.c | 2 +-
 arch/x86/kernel/traps.c   | 2 +-
 include/linux/ubsan.h     | 4 ++--
 lib/ubsan.c               | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 224f927ac8af..9bfa5c944379 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -1118,7 +1118,7 @@ static struct break_hook kasan_break_hook = {
 #ifdef CONFIG_UBSAN_TRAP
 static int ubsan_handler(struct pt_regs *regs, unsigned long esr)
 {
-	die(report_ubsan_failure(regs, esr & UBSAN_BRK_MASK), regs, esr);
+	die(report_ubsan_failure(esr & UBSAN_BRK_MASK), regs, esr);
 	return DBG_HOOK_HANDLED;
 }
 
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 9f88b8a78e50..4b5a7a1a8dde 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -351,7 +351,7 @@ static noinstr bool handle_bug(struct pt_regs *regs)
 	case BUG_UD1_UBSAN:
 		if (IS_ENABLED(CONFIG_UBSAN_TRAP)) {
 			pr_crit("%s at %pS\n",
-				report_ubsan_failure(regs, ud_imm),
+				report_ubsan_failure(ud_imm),
 				(void *)regs->ip);
 		}
 		break;
diff --git a/include/linux/ubsan.h b/include/linux/ubsan.h
index d8219cbe09ff..c843816f5f68 100644
--- a/include/linux/ubsan.h
+++ b/include/linux/ubsan.h
@@ -3,9 +3,9 @@
 #define _LINUX_UBSAN_H
 
 #ifdef CONFIG_UBSAN_TRAP
-const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type);
+const char *report_ubsan_failure(u32 check_type);
 #else
-static inline const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
+static inline const char *report_ubsan_failure(u32 check_type)
 {
 	return NULL;
 }
diff --git a/lib/ubsan.c b/lib/ubsan.c
index cdc1d31c3821..17993727fc96 100644
--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -25,7 +25,7 @@
  * The mappings of struct SanitizerKind (the -fsanitize=xxx args) to
  * enum SanitizerHandler (the traps) in Clang is in clang/lib/CodeGen/.
  */
-const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
+const char *report_ubsan_failure(u32 check_type)
 {
 	switch (check_type) {
 #ifdef CONFIG_UBSAN_BOUNDS
-- 
2.49.0.604.gff1f9ca942-goog