Fix panic in ktrcapfail() when no capability rights are passed.

While here, correct all consumers to pass NULL instead of 0 as we pass
capability rights as pointers now, not uint64_t.

Reported by:	Daniel Peyrolon
Tested by:	Daniel Peyrolon
Approved by:	re (marius)

6 files changed, 16 insertions, 9 deletions

diff --git a/sys/amd64/amd64/sys_machdep.c b/sys/amd64/amd64/sys_machdep.c
index 5be8af5..81ac0e3 100644
--- a/sys/amd64/amd64/sys_machdep.c
+++ b/sys/amd64/amd64/sys_machdep.c
@@ -209,7 +209,7 @@ sysarch(td, uap)
 		default:
 #ifdef KTRACE
 			if (KTRPOINT(td, KTR_CAPFAIL))
-				ktrcapfail(CAPFAIL_SYSCALL, 0, 0);
+				ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL);
 #endif
 			return (ECAPMODE);
 		}
diff --git a/sys/arm/arm/sys_machdep.c b/sys/arm/arm/sys_machdep.c
index 7676a96..7d7f0f5 100644
--- a/sys/arm/arm/sys_machdep.c
+++ b/sys/arm/arm/sys_machdep.c
@@ -138,7 +138,7 @@ sysarch(td, uap)
 		default:
 #ifdef KTRACE
 			if (KTRPOINT(td, KTR_CAPFAIL))
-				ktrcapfail(CAPFAIL_SYSCALL, 0, 0);
+				ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL);
 #endif
 			return (ECAPMODE);
 		}
diff --git a/sys/i386/i386/sys_machdep.c b/sys/i386/i386/sys_machdep.c
index adf6ac4..746f846 100644
--- a/sys/i386/i386/sys_machdep.c
+++ b/sys/i386/i386/sys_machdep.c
@@ -132,7 +132,7 @@ sysarch(td, uap)
 		default:
 #ifdef KTRACE
 			if (KTRPOINT(td, KTR_CAPFAIL))
-				ktrcapfail(CAPFAIL_SYSCALL, 0, 0);
+				ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL);
 #endif
 			return (ECAPMODE);
 		}
diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index 3b34fb0..d4b722a 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
 #include "opt_ktrace.h"
 
 #include <sys/param.h>
+#include <sys/capability.h>
 #include <sys/systm.h>
 #include <sys/fcntl.h>
 #include <sys/kernel.h>
@@ -791,8 +792,14 @@ ktrcapfail(type, needed, held)
 		return;
 	kcf = &req->ktr_data.ktr_cap_fail;
 	kcf->cap_type = type;
-	kcf->cap_needed = *needed;
-	kcf->cap_held = *held;
+	if (needed != NULL)
+		kcf->cap_needed = *needed;
+	else
+		cap_rights_init(&kcf->cap_needed);
+	if (held != NULL)
+		kcf->cap_held = *held;
+	else
+		cap_rights_init(&kcf->cap_held);
 	ktr_enqueuerequest(td, req);
 	ktrace_exit(td);
 }
diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c
index d4d0166..0be0463 100644
--- a/sys/kern/vfs_lookup.c
+++ b/sys/kern/vfs_lookup.c
@@ -178,7 +178,7 @@ namei(struct nameidata *ndp)
 		if (ndp->ni_dirfd == AT_FDCWD) {
 #ifdef KTRACE
 			if (KTRPOINT(td, KTR_CAPFAIL))
-				ktrcapfail(CAPFAIL_LOOKUP, 0, 0);
+				ktrcapfail(CAPFAIL_LOOKUP, NULL, NULL);
 #endif
 			error = ECAPMODE;
 		}
@@ -284,7 +284,7 @@ namei(struct nameidata *ndp)
 			if (ndp->ni_strictrelative != 0) {
 #ifdef KTRACE
 				if (KTRPOINT(curthread, KTR_CAPFAIL))
-					ktrcapfail(CAPFAIL_LOOKUP, 0, 0);
+					ktrcapfail(CAPFAIL_LOOKUP, NULL, NULL);
 #endif
 				return (ENOTCAPABLE);
 			}
@@ -640,7 +640,7 @@ dirloop:
 		if (ndp->ni_strictrelative != 0) {
 #ifdef KTRACE
 			if (KTRPOINT(curthread, KTR_CAPFAIL))
-				ktrcapfail(CAPFAIL_LOOKUP, 0, 0);
+				ktrcapfail(CAPFAIL_LOOKUP, NULL, NULL);
 #endif
 			error = ENOTCAPABLE;
 			goto bad;
diff --git a/sys/sparc64/sparc64/sys_machdep.c b/sys/sparc64/sparc64/sys_machdep.c
index c8e8694..9c9163f 100644
--- a/sys/sparc64/sparc64/sys_machdep.c
+++ b/sys/sparc64/sparc64/sys_machdep.c
@@ -71,7 +71,7 @@ sysarch(struct thread *td, struct sysarch_args *uap)
 		default:
 #ifdef KTRACE
 			if (KTRPOINT(td, KTR_CAPFAIL))
-				ktrcapfail(CAPFAIL_SYSCALL, 0, 0);
+				ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL);
 #endif
 			return (ECAPMODE);
 		}