linux-kernel - [PATCH 2/4] x86: use the correct function type for sys32_(rt

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Date:   Fri, 13 Sep 2019 14:00:16 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Kees Cook <keescook@...omium.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH 2/4] x86: use the correct function type for sys32_(rt_)sigreturn

Use the correct function type to avoid tripping Control-Flow
Integrity (CFI) checking.

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 arch/x86/ia32/ia32_signal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 1cee10091b9f..878d8998ce6d 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -118,7 +118,7 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
 	return err;
 }
 
-asmlinkage long sys32_sigreturn(void)
+asmlinkage long sys32_sigreturn(const struct pt_regs *__unused)
 {
 	struct pt_regs *regs = current_pt_regs();
 	struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8);
@@ -144,7 +144,7 @@ asmlinkage long sys32_sigreturn(void)
 	return 0;
 }
 
-asmlinkage long sys32_rt_sigreturn(void)
+asmlinkage long sys32_rt_sigreturn(const struct pt_regs *__unused)
 {
 	struct pt_regs *regs = current_pt_regs();
 	struct rt_sigframe_ia32 __user *frame;
-- 
2.23.0.237.gc6a4ce50a0-goog