linux-kernel - [REVIEW][PATCH 13/20] signal/x86: Remove the pkey parameter from do

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Date:   Tue, 18 Sep 2018 02:05:39 +0200
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [REVIEW][PATCH 13/20] signal/x86: Remove the pkey parameter from do_sigbus

The function do_sigbus never sets si_code to PKUERR so it can never
return a pkey to userspace.  Therefore remove the unusable pkey
parameter from do_sigbus.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 arch/x86/mm/fault.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index cfc88920716f..6886866c072d 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -962,7 +962,7 @@ bad_area_access_error(struct pt_regs *regs, unsigned long error_code,
 
 static void
 do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
-	  u32 *pkey, unsigned int fault)
+	  unsigned int fault)
 {
 	struct task_struct *tsk = current;
 
@@ -994,7 +994,7 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
 		return;
 	}
 #endif
-	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk, pkey);
+	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk, NULL);
 }
 
 static noinline void
@@ -1023,7 +1023,7 @@ mm_fault_error(struct pt_regs *regs, unsigned long error_code,
 	} else {
 		if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|
 			     VM_FAULT_HWPOISON_LARGE))
-			do_sigbus(regs, error_code, address, pkey, fault);
+			do_sigbus(regs, error_code, address, fault);
 		else if (fault & VM_FAULT_SIGSEGV)
 			bad_area_nosemaphore(regs, error_code, address);
 		else
-- 
2.17.1