linux-kernel - [PATCH v2 06/20] mips: Use generic copy_siginfo_{to,from}

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Message-Id: <1446684640-4112-7-git-send-email-amanieu@gmail.com>
Date:	Thu,  5 Nov 2015 00:50:25 +0000
From:	Amanieu d'Antras <amanieu@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Amanieu d'Antras <amanieu@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org
Subject: [PATCH v2 06/20] mips: Use generic copy_siginfo_{to,from}_user32

Signed-off-by: Amanieu d'Antras <amanieu@...il.com>
---
 arch/mips/include/asm/compat.h |  3 --
 arch/mips/kernel/signal32.c    | 62 ------------------------------------------
 2 files changed, 65 deletions(-)

diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h
index 29ca129..abc4fe4 100644
--- a/arch/mips/include/asm/compat.h
+++ b/arch/mips/include/asm/compat.h
@@ -132,9 +132,6 @@ typedef union compat_sigval {
 
 /* Can't use the generic version because si_code and si_errno are swapped */
 #define HAVE_ARCH_COMPAT_SIGINFO_T
-#define HAVE_ARCH_COPY_SIGINFO_TO_USER32
-#define HAVE_ARCH_COPY_SIGINFO_FROM_USER32
-#define SI_PAD_SIZE32	(128/sizeof(int) - 3)
 
 typedef struct compat_siginfo {
 	int si_signo;
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index f7e89524..b719aa3 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -181,68 +181,6 @@ SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *,
 	return ret;
 }
 
-int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
-{
-	int err;
-
-	if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
-		return -EFAULT;
-
-	/* If you change siginfo_t structure, please be sure
-	   this code is fixed accordingly.
-	   It should never copy any pad contained in the structure
-	   to avoid security leaks, but must copy the generic
-	   3 ints plus the relevant union member.
-	   This routine must convert siginfo from 64bit to 32bit as well
-	   at the same time.  */
-	err = __put_user(from->si_signo, &to->si_signo);
-	err |= __put_user(from->si_errno, &to->si_errno);
-	err |= __put_user((short)from->si_code, &to->si_code);
-	if (from->si_code < 0)
-		err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
-	else {
-		switch (from->si_code >> 16) {
-		case __SI_TIMER >> 16:
-			err |= __put_user(from->si_tid, &to->si_tid);
-			err |= __put_user(from->si_overrun, &to->si_overrun);
-			err |= __put_user(from->si_int, &to->si_int);
-			break;
-		case __SI_CHLD >> 16:
-			err |= __put_user(from->si_utime, &to->si_utime);
-			err |= __put_user(from->si_stime, &to->si_stime);
-			err |= __put_user(from->si_status, &to->si_status);
-		default:
-			err |= __put_user(from->si_pid, &to->si_pid);
-			err |= __put_user(from->si_uid, &to->si_uid);
-			break;
-		case __SI_FAULT >> 16:
-			err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
-			break;
-		case __SI_POLL >> 16:
-			err |= __put_user(from->si_band, &to->si_band);
-			err |= __put_user(from->si_fd, &to->si_fd);
-			break;
-		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
-		case __SI_MESGQ >> 16:
-			err |= __put_user(from->si_pid, &to->si_pid);
-			err |= __put_user(from->si_uid, &to->si_uid);
-			err |= __put_user(from->si_int, &to->si_int);
-			break;
-		}
-	}
-	return err;
-}
-
-int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
-{
-	if (copy_from_user(to, from, 3*sizeof(int)) ||
-	    copy_from_user(to->_sifields._pad,
-			   from->_sifields._pad, SI_PAD_SIZE32))
-		return -EFAULT;
-
-	return 0;
-}
-
 asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
 {
 	struct sigframe32 __user *frame;
-- 
2.6.2

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