From: Dave Hansen <dave@sr71.net>
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@sr71.net>,
dave.hansen@linux.intel.com
Subject: [PATCH 02/11] mpx: extend siginfo structure to include bound violation information
Date: Wed, 12 Nov 2014 09:04:49 -0800 [thread overview]
Message-ID: <20141112170449.31E37276@viggo.jf.intel.com> (raw)
In-Reply-To: <20141112170443.B4BD0899@viggo.jf.intel.com>
From: Dave Hansen <dave.hansen@linux.intel.com>
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 <qiaowei.ren@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
---
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);
_
--
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next prev parent reply other threads:[~2014-11-12 17:10 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-12 17:04 [PATCH 00/11] [v10] Intel MPX support Dave Hansen
2014-11-12 17:04 ` [PATCH 01/11] x86, mpx: rename cfg_reg_u and status_reg Dave Hansen
2014-11-12 17:04 ` Dave Hansen [this message]
2014-11-12 17:04 ` [PATCH 03/11] mips: sync struct siginfo with general version Dave Hansen
2014-11-12 17:04 ` [PATCH 04/11] ia64: " Dave Hansen
2014-11-12 17:04 ` [PATCH 05/11] x86, mpx: add MPX to disaabled features Dave Hansen
2014-11-12 17:05 ` [PATCH 06/11] x86, mpx: introduce VM_MPX to indicate that a VMA is MPX specific Dave Hansen
2014-11-12 17:05 ` [PATCH 07/11] x86, mpx: add MPX-specific mmap interface Dave Hansen
2014-11-12 17:05 ` [PATCH 08/11] x86, mpx: [new code] decode MPX instruction to get bound violation information Dave Hansen
2014-11-13 13:51 ` Thomas Gleixner
2014-11-12 17:05 ` [PATCH 09/11] x86, mpx: on-demand kernel allocation of bounds tables Dave Hansen
2014-11-13 14:29 ` Thomas Gleixner
2014-11-12 17:05 ` [PATCH 10/11] x86, mpx: cleanup unused bound tables Dave Hansen
2014-11-13 14:55 ` Thomas Gleixner
2014-11-13 15:29 ` Dave Hansen
2014-11-12 17:05 ` [PATCH 11/11] x86, mpx: add documentation on Intel MPX Dave Hansen
2014-11-14 15:18 [PATCH 00/11] [v11] Intel MPX support Dave Hansen
2014-11-14 15:18 ` [PATCH 02/11] mpx: extend siginfo structure to include bound violation information Dave Hansen
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