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mpx: Extend siginfo structure to include bound violation information

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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>
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: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Qiaowei Ren 2014-11-14 07:18:19 -08:00 committed by Thomas Gleixner
parent 62e7759b1b
commit ee1b58d36a
2 changed files with 12 additions and 1 deletions
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9
include/uapi/asm-generic/siginfo.h
View file

@ -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

4
kernel/signal.c
View file

@ -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: