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MIPS: Provide correct siginfo_t.si_stime

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Provide correct siginfo_t.si_stime on MIPS64

Bug description:
MIPS version of copy_siginfo() is not aware of alignment on platforms with
64-bit long integers, which leads to an incorrect si_stime passed to signal
handlers, because the last element (si_stime) of _sifields._sigchld is not
copied. If _MIPS_SZLONG is 64, then the _sifields starts at the offset of
4 * sizeof(int).

Patch description:
Use the generic copy_siginfo, which doesn't have this problem.

Signed-off-by: Petr Malat <oss@malat.biz>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8671/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Petr Malat 2014-12-12 15:28:01 +01:00 committed by Ralf Baechle
parent 32098ec7bc
commit 8cb48fe169
2 changed files with 3 additions and 37 deletions
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29
arch/mips/include/asm/siginfo.h
View File

@ -1,29 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1998, 1999, 2001, 2003 Ralf Baechle
* Copyright (C) 2000, 2001 Silicon Graphics, Inc.
*/
#ifndef _ASM_SIGINFO_H
#define _ASM_SIGINFO_H
#include <uapi/asm/siginfo.h>
/*
* Duplicated here because of <asm-generic/siginfo.h> braindamage ...
*/
#include <linux/string.h>
static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
{
if (from->si_code < 0)
memcpy(to, from, sizeof(*to));
else
/* _sigchld is currently the largest know union member */
memcpy(to, from, 3*sizeof(int) + sizeof(from->_sifields._sigchld));
}
#endif /* _ASM_SIGINFO_H */

11
arch/mips/include/uapi/asm/siginfo.h
View File

@ -15,13 +15,6 @@
#define HAVE_ARCH_SIGINFO_T
/*
* We duplicate the generic versions - <asm-generic/siginfo.h> is just borked
* by design ...
*/
#define HAVE_ARCH_COPY_SIGINFO
struct siginfo;
/*
* Careful to keep union _sifields from shifting ...
*/
@ -35,8 +28,9 @@ struct siginfo;
#define __ARCH_SIGSYS
#include <asm-generic/siginfo.h>
#include <uapi/asm-generic/siginfo.h>
/* We can't use generic siginfo_t, because our si_code and si_errno are swapped */
typedef struct siginfo {
int si_signo;
int si_code;
@ -124,5 +118,6 @@ typedef struct siginfo {
#define SI_TIMER __SI_CODE(__SI_TIMER, -3) /* sent by timer expiration */
#define SI_MESGQ __SI_CODE(__SI_MESGQ, -4) /* sent by real time mesq state change */
#include <asm-generic/siginfo.h>
#endif /* _UAPI_ASM_SIGINFO_H */