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Commit ee1b58d3 authored by Qiaowei Ren's avatar Qiaowei Ren Committed by Thomas Gleixner
Browse files

mpx: Extend siginfo structure to include bound violation information 



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: default avatarQiaowei Ren <qiaowei.ren@intel.com>
Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
Cc: linux-mm@kvack.org
Cc: linux-mips@linux-mips.org
Cc: Dave Hansen <dave@sr71.net>
Link: http://lkml.kernel.org/r/20141114151819.1908C900@viggo.jf.intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 62e7759b

include/uapi/asm-generic/siginfo.h

+8 −1
Original line number Diff line number Diff line
@@ -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

kernel/signal.c

+4 −0
Original line number Diff line number Diff line
@@ -2747,6 +2747,10 @@ int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from) 
		 */

		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: