v10: - first version based on suggestion

Suggested-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Will Drewry <wad@chromium.org>
---
 arch/x86/ia32/ia32_signal.c   |    4 ++++
 arch/x86/include/asm/ia32.h   |    6 ++++++
 include/asm-generic/siginfo.h |   18 ++++++++++++++++++
 kernel/signal.c               |    2 +-
 4 files changed, 29 insertions(+), 1 deletions(-)

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 6557769..c81d2c7 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c

@@ -73,6 +73,10 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t

*from)
 			switch (from->si_code >> 16) {
 			case __SI_FAULT >> 16:
 				break;
+			case __SI_SYS >> 16:
+				put_user_ex(from->si_syscall, &to->si_syscall);
+				put_user_ex(from->si_arch, &to->si_arch);
+				break;
 			case __SI_CHLD >> 16:
 				put_user_ex(from->si_utime, &to->si_utime);
 				put_user_ex(from->si_stime, &to->si_stime);

diff --git a/arch/x86/include/asm/ia32.h b/arch/x86/include/asm/ia32.h
index 1f7e625..541485f 100644
--- a/arch/x86/include/asm/ia32.h
+++ b/arch/x86/include/asm/ia32.h

@@ -126,6 +126,12 @@ typedef struct compat_siginfo {
 			int _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
 			int _fd;
 		} _sigpoll;
+
+		struct {
+			unsigned int _call_addr; /* calling insn */

+			int _syscall;	/* triggering system call number */
+			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
+		} _sigsys;
 	} _sifields;
 } compat_siginfo_t;

diff --git a/include/asm-generic/siginfo.h b/include/asm-generic/siginfo.h
index 0dd4e87..a83b478 100644
--- a/include/asm-generic/siginfo.h
+++ b/include/asm-generic/siginfo.h

@@ -90,6 +90,13 @@ typedef struct siginfo {
 			__ARCH_SI_BAND_T _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
 			int _fd;
 		} _sigpoll;
+
+		/* SIGSYS */
+		struct {
+			void __user *_call_addr; /* calling insn */

+			int _syscall;	/* triggering system call number */
+			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
+		} _sigsys;
 	} _sifields;
 } siginfo_t;

@@ -116,6 +123,9 @@ typedef struct siginfo {
 #define si_addr_lsb	_sifields._sigfault._addr_lsb
 #define si_band		_sifields._sigpoll._band
 #define si_fd		_sifields._sigpoll._fd
+#define si_call_addr	_sifields._sigsys._call_addr
+#define si_syscall	_sifields._sigsys._syscall
+#define si_arch		_sifields._sigsys._arch

 #ifdef __KERNEL__
 #define __SI_MASK	0xffff0000u

@@ -126,6 +136,7 @@ typedef struct siginfo {
 #define __SI_CHLD	(4 << 16)
 #define __SI_RT		(5 << 16)
 #define __SI_MESGQ	(6 << 16)
+#define __SI_SYS	(7 << 16)
 #define __SI_CODE(T,N)	((T) | ((N) & 0xffff))
 #else
 #define __SI_KILL	0

@@ -135,6 +146,7 @@ typedef struct siginfo {
 #define __SI_CHLD	0
 #define __SI_RT		0
 #define __SI_MESGQ	0
+#define __SI_SYS	0
 #define __SI_CODE(T,N)	(N)
 #endif

@@ -232,6 +244,12 @@ typedef struct siginfo {
 #define NSIGPOLL	6

 /*
+ * SIGSYS si_codes
+ */
+#define SYS_SECCOMP		(__SI_SYS|1)	/* seccomp triggered */
+#define NSIGSYS	1
+
+/*
  * sigevent definitions
  *
  * It seems likely that SIGEV_THREAD will have to be handled from

diff --git a/kernel/signal.c b/kernel/signal.c
index c73c428..7573819 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c

@@ -160,7 +160,7 @@ void recalc_sigpending(void)

 #define SYNCHRONOUS_MASK \
 	(sigmask(SIGSEGV) | sigmask(SIGBUS) | sigmask(SIGILL) | \
-	 sigmask(SIGTRAP) | sigmask(SIGFPE))
+	 sigmask(SIGTRAP) | sigmask(SIGFPE) | sigmask(SIGSYS))

 int next_signal(struct sigpending *pending, sigset_t *mask)
 {
--