From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f52.google.com (mail-pa0-f52.google.com [209.85.220.52]) by kanga.kvack.org (Postfix) with ESMTP id 96D2A6B00F3 for ; Wed, 12 Nov 2014 12:10:46 -0500 (EST) Received: by mail-pa0-f52.google.com with SMTP id fa1so13340256pad.11 for ; Wed, 12 Nov 2014 09:10:45 -0800 (PST) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTP id x8si23324595pdi.155.2014.11.12.09.10.42 for ; Wed, 12 Nov 2014 09:10:43 -0800 (PST) Subject: [PATCH 02/11] mpx: extend siginfo structure to include bound violation information From: Dave Hansen Date: Wed, 12 Nov 2014 09:04:49 -0800 References: <20141112170443.B4BD0899@viggo.jf.intel.com> In-Reply-To: <20141112170443.B4BD0899@viggo.jf.intel.com> Message-Id: <20141112170449.31E37276@viggo.jf.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: hpa@zytor.com Cc: tglx@linutronix.de, mingo@redhat.com, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@linux-mips.org, qiaowei.ren@intel.com, Dave Hansen , dave.hansen@linux.intel.com From: Dave Hansen This patch adds new fields about bound violation into siginfo structure. si_lower and si_upper are respectively lower bound and upper bound when bound violation is caused. Signed-off-by: Qiaowei Ren Signed-off-by: Dave Hansen --- b/include/uapi/asm-generic/siginfo.h | 9 ++++++++- b/kernel/signal.c | 4 ++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff -puN include/uapi/asm-generic/siginfo.h~2014-10-14-06_12-mpx-extend-siginfo-structure-to-include-bound-violation-information include/uapi/asm-generic/siginfo.h --- a/include/uapi/asm-generic/siginfo.h~2014-10-14-06_12-mpx-extend-siginfo-structure-to-include-bound-violation-information 2014-11-12 08:49:23.866797944 -0800 +++ b/include/uapi/asm-generic/siginfo.h 2014-11-12 08:49:23.871798169 -0800 @@ -91,6 +91,10 @@ typedef struct siginfo { int _trapno; /* TRAP # which caused the signal */ #endif short _addr_lsb; /* LSB of the reported address */ + struct { + void __user *_lower; + void __user *_upper; + } _addr_bnd; } _sigfault; /* SIGPOLL */ @@ -131,6 +135,8 @@ typedef struct siginfo { #define si_trapno _sifields._sigfault._trapno #endif #define si_addr_lsb _sifields._sigfault._addr_lsb +#define si_lower _sifields._sigfault._addr_bnd._lower +#define si_upper _sifields._sigfault._addr_bnd._upper #define si_band _sifields._sigpoll._band #define si_fd _sifields._sigpoll._fd #ifdef __ARCH_SIGSYS @@ -199,7 +205,8 @@ typedef struct siginfo { */ #define SEGV_MAPERR (__SI_FAULT|1) /* address not mapped to object */ #define SEGV_ACCERR (__SI_FAULT|2) /* invalid permissions for mapped object */ -#define NSIGSEGV 2 +#define SEGV_BNDERR (__SI_FAULT|3) /* failed address bound checks */ +#define NSIGSEGV 3 /* * SIGBUS si_codes diff -puN kernel/signal.c~2014-10-14-06_12-mpx-extend-siginfo-structure-to-include-bound-violation-information kernel/signal.c --- a/kernel/signal.c~2014-10-14-06_12-mpx-extend-siginfo-structure-to-include-bound-violation-information 2014-11-12 08:49:23.868798034 -0800 +++ b/kernel/signal.c 2014-11-12 08:49:23.872798214 -0800 @@ -2751,6 +2751,10 @@ int copy_siginfo_to_user(siginfo_t __use if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO) err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb); #endif +#ifdef SEGV_BNDERR + err |= __put_user(from->si_lower, &to->si_lower); + err |= __put_user(from->si_upper, &to->si_upper); +#endif break; case __SI_CHLD: err |= __put_user(from->si_pid, &to->si_pid); _ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org