RE: [PATCH v7 05/10] x86, mpx: extend siginfo structure to include bound violation information

[Zhang, Tianfei]

> -----Original Message-----
> From: owner-linux-mm@xxxxxxxxx [mailto:owner-linux-mm@xxxxxxxxx] On
> Behalf Of Qiaowei Ren
> Sent: Monday, July 21, 2014 1:39 PM
> To: H. Peter Anvin; Thomas Gleixner; Ingo Molnar; Hansen, Dave
> Cc: x86@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; Ren,
> Qiaowei
> Subject: [PATCH v7 05/10] x86, 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: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
> ---
>  include/uapi/asm-generic/siginfo.h |    9 ++++++++-
>  kernel/signal.c                    |    4 ++++
>  2 files changed, 12 insertions(+), 1 deletions(-)
> 
> diff --git a/include/uapi/asm-generic/siginfo.h
> b/include/uapi/asm-generic/siginfo.h
> index ba5be7f..1e35520 100644
> --- a/include/uapi/asm-generic/siginfo.h
> +++ b/include/uapi/asm-generic/siginfo.h
> @@ -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 --git a/kernel/signal.c b/kernel/signal.c index a4077e9..2131636 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -2748,6 +2748,10 @@ 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

"#endif" should be in a new line.

>  		break;
>  	case __SI_CHLD:
>  		err |= __put_user(from->si_pid, &to->si_pid);
> --
> 1.7.1
> 
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