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More netbsd32 emulation ktrace overrides
As mentioned in the other thread here, I am trying to make ktrace output
working for netbsd32 emulated ktrace/kdump.
The patch below allows emulations to override the "msghdr" ktrace data
output by various variants of sendmsg/recvmsg. This is simmply done by
passing two new args to do_sys_sendmsg()/do_sys_recvmsg() and friends
which provide alternative data to record in the ktrace record.
Since a full msgheader is not always conveniently available, it is also
possible to pass a NULL pointer and ~0U as size to skip this ktrace
record completely.
If passing NULL/0 as the new args, the native msghdr is output, which means
most callers simply needed adding "NULL, 0," in the argument list.
A few compat versions are missing here, but will be added before commit.
Any objections?
Martin
Index: compat/common/uipc_syscalls_43.c
===================================================================
RCS file: /cvsroot/src/sys/compat/common/uipc_syscalls_43.c,v
retrieving revision 1.46
diff -u -p -r1.46 uipc_syscalls_43.c
--- compat/common/uipc_syscalls_43.c 9 Nov 2014 17:48:07 -0000 1.46
+++ compat/common/uipc_syscalls_43.c 9 Sep 2016 07:54:37 -0000
@@ -216,7 +216,7 @@ compat_43_sys_recvmsg(struct lwp *l, con
msg.msg_iov = omsg.msg_iov;
msg.msg_flags = (SCARG(uap, flags) & MSG_USERFLAGS) | MSG_IOVUSRSPACE;
- error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from,
+ error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, 0, &from,
omsg.msg_accrights != NULL ? &control : NULL, retval);
if (error != 0)
return error;
@@ -361,7 +361,8 @@ compat_43_sys_sendmsg(struct lwp *l, con
if (error != 0)
goto bad;
- return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
+ return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags),
+ NULL, 0, retval);
bad:
if (nam != NULL)
Index: compat/linux/common/linux_socket.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/common/linux_socket.c,v
retrieving revision 1.132
diff -u -p -r1.132 linux_socket.c
--- compat/linux/common/linux_socket.c 1 Aug 2016 03:15:30 -0000 1.132
+++ compat/linux/common/linux_socket.c 9 Sep 2016 07:54:37 -0000
@@ -428,7 +428,8 @@ linux_sys_sendto(struct lwp *l, const st
aiov.iov_base = __UNCONST(SCARG(uap, msg));
aiov.iov_len = SCARG(uap, len);
- return do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, retval);
+ return do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags,
+ NULL, 0, retval);
}
static void
@@ -617,7 +618,8 @@ linux_sys_sendmsg(struct lwp *l, const s
}
skipcmsg:
- error = do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, retval);
+ error = do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags,
+ NULL, 0, retval);
/* Freed internally */
ctl_mbuf = NULL;
@@ -779,7 +781,7 @@ linux_sys_recvmsg(struct lwp *l, const s
}
msg.msg_flags |= MSG_IOVUSRSPACE;
- error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from,
+ error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, 0, &from,
msg.msg_control != NULL ? &control : NULL, retval);
if (error != 0)
return error;
Index: compat/netbsd32/netbsd32_compat_43.c
===================================================================
RCS file: /cvsroot/src/sys/compat/netbsd32/netbsd32_compat_43.c,v
retrieving revision 1.53
diff -u -p -r1.53 netbsd32_compat_43.c
--- compat/netbsd32/netbsd32_compat_43.c 23 Apr 2010 23:05:40 -0000 1.53
+++ compat/netbsd32/netbsd32_compat_43.c 9 Sep 2016 07:54:37 -0000
@@ -451,7 +451,7 @@ compat_43_netbsd32_orecvmsg(struct lwp *
msg.msg_iov = iov;
msg.msg_flags = SCARG(uap, flags) & MSG_USERFLAGS;
- error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from,
+ error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, 0, &from,
NETBSD32PTR64(omsg.msg_accrights) != NULL ? &control : NULL,
retval);
if (error != 0)
@@ -547,7 +547,8 @@ compat_43_netbsd32_osendmsg(struct lwp *
goto out;
}
- error = do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
+ error = do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags),
+ &omsg, sizeof(omsg), retval);
out:
if (iov != aiov)
Index: compat/netbsd32/netbsd32_socket.c
===================================================================
RCS file: /cvsroot/src/sys/compat/netbsd32/netbsd32_socket.c,v
retrieving revision 1.43
diff -u -p -r1.43 netbsd32_socket.c
--- compat/netbsd32/netbsd32_socket.c 8 Sep 2016 18:54:03 -0000 1.43
+++ compat/netbsd32/netbsd32_socket.c 9 Sep 2016 07:54:37 -0000
@@ -193,8 +193,8 @@ netbsd32_recvmsg(struct lwp *l, const st
msg.msg_iov = iov;
msg.msg_iovlen = msg32.msg_iovlen;
- error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from,
- msg.msg_control != NULL ? &control : NULL, retval);
+ error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &msg32, sizeof(msg32),
+ &from, msg.msg_control != NULL ? &control : NULL, retval);
if (error != 0)
goto done;
@@ -367,7 +367,8 @@ netbsd32_sendmsg(struct lwp *l, const st
goto out;
msg.msg_iov = iov;
- error = do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
+ error = do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags),
+ &msg32, sizeof(msg32), retval);
/* msg.msg_control freed by do_sys_sendmsg() */
if (iov != aiov)
@@ -406,7 +407,8 @@ netbsd32_recvfrom(struct lwp *l, const s
msg.msg_control = NULL;
msg.msg_flags = SCARG(uap, flags) & MSG_USERFLAGS;
- error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, NULL, retval);
+ error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, ~0U,
+ &from, NULL, retval);
if (error != 0)
return error;
@@ -439,5 +441,6 @@ netbsd32_sendto(struct lwp *l, const str
aiov.iov_base = SCARG_P32(uap, buf); /* XXX kills const */
aiov.iov_len = SCARG(uap, len);
msg.msg_flags = 0;
- return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
+ return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags),
+ NULL, ~0U, retval);
}
Index: kern/kern_ktrace.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_ktrace.c,v
retrieving revision 1.167
diff -u -p -r1.167 kern_ktrace.c
--- kern/kern_ktrace.c 7 Jul 2016 06:55:43 -0000 1.167
+++ kern/kern_ktrace.c 9 Sep 2016 07:54:37 -0000
@@ -938,7 +938,7 @@ ktruser(const char *id, void *addr, size
}
void
-ktr_kuser(const char *id, void *addr, size_t len)
+ktr_kuser(const char *id, const void *addr, size_t len)
{
struct ktrace_entry *kte;
struct ktr_user *ktp;
Index: kern/uipc_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/kern/uipc_syscalls.c,v
retrieving revision 1.182
diff -u -p -r1.182 uipc_syscalls.c
--- kern/uipc_syscalls.c 7 Jul 2016 06:55:43 -0000 1.182
+++ kern/uipc_syscalls.c 9 Sep 2016 07:54:37 -0000
@@ -505,7 +505,8 @@ sys_sendto(struct lwp *l, const struct s
msg.msg_flags = 0;
aiov.iov_base = __UNCONST(SCARG(uap, buf)); /* XXXUNCONST kills const */
aiov.iov_len = SCARG(uap, len);
- return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
+ return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags),
+ NULL, 0, retval);
}
int
@@ -525,12 +526,14 @@ sys_sendmsg(struct lwp *l, const struct
return (error);
msg.msg_flags = MSG_IOVUSRSPACE;
- return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
+ return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags),
+ NULL, 0, retval);
}
static int
do_sys_sendmsg_so(struct lwp *l, int s, struct socket *so, file_t *fp,
- struct msghdr *mp, int flags, register_t *retsize)
+ struct msghdr *mp, int flags, const void *kthdr, size_t ktsize,
+ register_t *retsize)
{
struct iovec aiov[UIO_SMALLIOV], *iov = aiov, *tiov, *ktriov = NULL;
@@ -540,7 +543,12 @@ do_sys_sendmsg_so(struct lwp *l, int s,
size_t len, iovsz;
int i, error;
- ktrkuser("msghdr", mp, sizeof *mp);
+ if (__predict_false(kthdr == NULL && ktsize == 0)) {
+ kthdr = mp;
+ ktsize = sizeof(*mp);
+ }
+ if (__predict_true(kthdr != NULL))
+ ktrkuser("msghdr", kthdr, ktsize);
/* If the caller passed us stuff in mbufs, we must free them. */
to = (mp->msg_flags & MSG_NAMEMBUF) ? mp->msg_name : NULL;
@@ -656,7 +664,7 @@ bad:
int
do_sys_sendmsg(struct lwp *l, int s, struct msghdr *mp, int flags,
- register_t *retsize)
+ const void *kthdr, size_t ktsize, register_t *retsize)
{
int error;
struct socket *so;
@@ -670,7 +678,8 @@ do_sys_sendmsg(struct lwp *l, int s, str
m_freem(mp->msg_control);
return error;
}
- error = do_sys_sendmsg_so(l, s, so, fp, mp, flags, retsize);
+ error = do_sys_sendmsg_so(l, s, so, fp, mp, flags, kthdr, ktsize,
+ retsize);
/* msg_name and msg_control freed */
fd_putfile(s);
return error;
@@ -701,7 +710,8 @@ sys_recvfrom(struct lwp *l, const struct
msg.msg_control = NULL;
msg.msg_flags = SCARG(uap, flags) & MSG_USERFLAGS;
- error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, NULL, retval);
+ error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, 0, &from,
+ NULL, retval);
if (error != 0)
return error;
@@ -731,7 +741,7 @@ sys_recvmsg(struct lwp *l, const struct
msg.msg_flags = (SCARG(uap, flags) & MSG_USERFLAGS) | MSG_IOVUSRSPACE;
- error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from,
+ error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, 0, &from,
msg.msg_control != NULL ? &control : NULL, retval);
if (error != 0)
return error;
@@ -786,7 +796,8 @@ sys_sendmmsg(struct lwp *l, const struct
msg->msg_flags = flags;
- error = do_sys_sendmsg_so(l, s, so, fp, msg, flags, retval);
+ error = do_sys_sendmsg_so(l, s, so, fp, msg, flags,
+ &msg, sizeof(msg), retval);
if (error)
break;
@@ -913,14 +924,20 @@ copyout_msg_control(struct lwp *l, struc
static int
do_sys_recvmsg_so(struct lwp *l, int s, struct socket *so, struct msghdr *mp,
- struct mbuf **from, struct mbuf **control, register_t *retsize)
+ const void *ktrhdr, size_t ktsize, struct mbuf **from,
+ struct mbuf **control, register_t *retsize)
{
struct iovec aiov[UIO_SMALLIOV], *iov = aiov, *tiov, *ktriov = NULL;
struct uio auio;
size_t len, iovsz;
int i, error;
- ktrkuser("msghdr", mp, sizeof *mp);
+ if (__predict_false(ktrhdr == NULL && ktsize == 0)) {
+ ktrhdr = mp;
+ ktsize = sizeof *mp;
+ }
+ if (__predict_true(ktrhdr != NULL))
+ ktrkuser("msghdr", ktrhdr, ktsize);
*from = NULL;
if (control != NULL)
@@ -1002,15 +1019,17 @@ do_sys_recvmsg_so(struct lwp *l, int s,
int
-do_sys_recvmsg(struct lwp *l, int s, struct msghdr *mp, struct mbuf **from,
- struct mbuf **control, register_t *retsize)
+do_sys_recvmsg(struct lwp *l, int s, struct msghdr *mp,
+ const void *ktrhdr, size_t ktrsize,
+ struct mbuf **from, struct mbuf **control, register_t *retsize)
{
int error;
struct socket *so;
if ((error = fd_getsock(s, &so)) != 0)
return error;
- error = do_sys_recvmsg_so(l, s, so, mp, from, control, retsize);
+ error = do_sys_recvmsg_so(l, s, so, mp, ktrhdr, ktrsize, from,
+ control, retsize);
fd_putfile(s);
return error;
}
@@ -1064,7 +1083,7 @@ sys_recvmmsg(struct lwp *l, const struct
from = NULL;
}
- error = do_sys_recvmsg_so(l, s, so, msg, &from,
+ error = do_sys_recvmsg_so(l, s, so, msg, NULL, 0, &from,
msg->msg_control != NULL ? &control : NULL, retval);
if (error) {
if (error == EAGAIN && dg > 0)
Index: sys/ktrace.h
===================================================================
RCS file: /cvsroot/src/sys/sys/ktrace.h,v
retrieving revision 1.63
diff -u -p -r1.63 ktrace.h
--- sys/ktrace.h 19 Mar 2016 17:04:12 -0000 1.63
+++ sys/ktrace.h 9 Sep 2016 07:54:37 -0000
@@ -296,7 +296,7 @@ void ktr_namei2(const char *, size_t, co
void ktr_psig(int, sig_t, const sigset_t *, const ksiginfo_t *);
void ktr_syscall(register_t, const register_t [], int);
void ktr_sysret(register_t, int, register_t *);
-void ktr_kuser(const char *, void *, size_t);
+void ktr_kuser(const char *, const void *, size_t);
void ktr_mib(const int *a , u_int b);
void ktr_execarg(const void *, size_t);
void ktr_execenv(const void *, size_t);
@@ -398,7 +398,7 @@ ktrsysret(register_t a, int b, register_
}
static inline void
-ktrkuser(const char *a, void *b, size_t c)
+ktrkuser(const char *a, const void *b, size_t c)
{
if (__predict_false(ktrace_on))
ktr_kuser(a, b, c);
Index: sys/socketvar.h
===================================================================
RCS file: /cvsroot/src/sys/sys/socketvar.h,v
retrieving revision 1.140
diff -u -p -r1.140 socketvar.h
--- sys/socketvar.h 1 Jun 2016 04:15:54 -0000 1.140
+++ sys/socketvar.h 9 Sep 2016 07:54:37 -0000
@@ -351,9 +351,11 @@ void free_control_mbuf(struct lwp *, str
int do_sys_getpeername(int, struct sockaddr *);
int do_sys_getsockname(int, struct sockaddr *);
-int do_sys_sendmsg(struct lwp *, int, struct msghdr *, int, register_t *);
-int do_sys_recvmsg(struct lwp *, int, struct msghdr *, struct mbuf **,
- struct mbuf **, register_t *);
+int do_sys_sendmsg(struct lwp *, int, struct msghdr *, int,
+ const void *, size_t, register_t *);
+int do_sys_recvmsg(struct lwp *, int, struct msghdr *,
+ const void *, size_t,
+ struct mbuf **, struct mbuf **, register_t *);
int do_sys_bind(struct lwp *, int, struct sockaddr *);
int do_sys_connect(struct lwp *, int, struct sockaddr *);
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