36f5d07745
Otherwise there exists a narrow window during which a syscall probe can be disabled and cause a concurrently-running thread to call dtrace_probe() with an invalid probe ID. Reported by: ngie MFC after: 1 week Sponsored by: Dell EMC Isilon
410 lines
11 KiB
C
410 lines
11 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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* Portions Copyright 2006-2008 John Birrell jb@freebsd.org
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*/
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/*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/cpuvar.h>
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#include <sys/dtrace.h>
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#include <sys/fcntl.h>
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#include <sys/filio.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/kmem.h>
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#include <sys/kthread.h>
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#include <sys/limits.h>
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#include <sys/linker.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/poll.h>
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#include <sys/proc.h>
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#include <sys/selinfo.h>
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#include <sys/smp.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/uio.h>
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#include <sys/unistd.h>
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#include <cddl/dev/dtrace/dtrace_cddl.h>
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#include <machine/stdarg.h>
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#ifdef LINUX_SYSTRACE
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#if defined(__amd64__)
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#include <amd64/linux/linux.h>
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#include <amd64/linux/linux_proto.h>
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#include <amd64/linux/linux_syscalls.c>
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#include <amd64/linux/linux_systrace_args.c>
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#elif defined(__i386__)
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#include <i386/linux/linux.h>
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#include <i386/linux/linux_proto.h>
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#include <i386/linux/linux_syscalls.c>
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#include <i386/linux/linux_systrace_args.c>
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#else
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#error Only i386 and amd64 are supported.
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#endif
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#define MODNAME "linux"
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extern struct sysent linux_sysent[];
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#define MAXSYSCALL LINUX_SYS_MAXSYSCALL
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#define SYSCALLNAMES linux_syscallnames
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#define SYSENT linux_sysent
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#elif defined(LINUX32_SYSTRACE)
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#if defined(__amd64__)
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#include <amd64/linux32/linux.h>
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#include <amd64/linux32/linux32_proto.h>
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#include <amd64/linux32/linux32_syscalls.c>
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#include <amd64/linux32/linux32_systrace_args.c>
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#else
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#error Only amd64 is supported.
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#endif
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#define MODNAME "linux32"
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extern struct sysent linux32_sysent[];
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#define MAXSYSCALL LINUX32_SYS_MAXSYSCALL
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#define SYSCALLNAMES linux32_syscallnames
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#define SYSENT linux32_sysent
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#elif defined(FREEBSD32_SYSTRACE)
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/*
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* The syscall arguments are processed into a DTrace argument array
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* using a generated function. See sys/kern/makesyscalls.sh.
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*/
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <compat/freebsd32/freebsd32_util.h>
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#include <compat/freebsd32/freebsd32_syscall.h>
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#include <compat/freebsd32/freebsd32_systrace_args.c>
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extern const char *freebsd32_syscallnames[];
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#define MODNAME "freebsd32"
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#define MAXSYSCALL FREEBSD32_SYS_MAXSYSCALL
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#define SYSCALLNAMES freebsd32_syscallnames
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#define SYSENT freebsd32_sysent
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#else
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/*
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* The syscall arguments are processed into a DTrace argument array
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* using a generated function. See sys/kern/makesyscalls.sh.
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*/
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#include <sys/syscall.h>
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#include <kern/systrace_args.c>
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#define MODNAME "freebsd"
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#define MAXSYSCALL SYS_MAXSYSCALL
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#define SYSCALLNAMES syscallnames
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#define SYSENT sysent
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#define NATIVE_ABI
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#endif
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#define PROVNAME "syscall"
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#define DEVNAME "dtrace/systrace/" MODNAME
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#define SYSTRACE_ARTIFICIAL_FRAMES 1
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#define SYSTRACE_SHIFT 16
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#define SYSTRACE_ISENTRY(x) ((int)(x) >> SYSTRACE_SHIFT)
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#define SYSTRACE_SYSNUM(x) ((int)(x) & ((1 << SYSTRACE_SHIFT) - 1))
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#define SYSTRACE_ENTRY(id) ((1 << SYSTRACE_SHIFT) | (id))
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#define SYSTRACE_RETURN(id) (id)
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#if ((1 << SYSTRACE_SHIFT) <= MAXSYSCALL)
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#error 1 << SYSTRACE_SHIFT must exceed number of system calls
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#endif
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static void systrace_load(void *);
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static void systrace_unload(void *);
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static void systrace_getargdesc(void *, dtrace_id_t, void *,
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dtrace_argdesc_t *);
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static uint64_t systrace_getargval(void *, dtrace_id_t, void *, int, int);
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static void systrace_provide(void *, dtrace_probedesc_t *);
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static void systrace_destroy(void *, dtrace_id_t, void *);
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static void systrace_enable(void *, dtrace_id_t, void *);
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static void systrace_disable(void *, dtrace_id_t, void *);
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static union {
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const char **p_constnames;
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char **pp_syscallnames;
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} uglyhack = { SYSCALLNAMES };
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static dtrace_pattr_t systrace_attr = {
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{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
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{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
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{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
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{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
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{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
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};
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static dtrace_pops_t systrace_pops = {
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systrace_provide,
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NULL,
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systrace_enable,
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systrace_disable,
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NULL,
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NULL,
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systrace_getargdesc,
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systrace_getargval,
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NULL,
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systrace_destroy
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};
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static dtrace_provider_id_t systrace_id;
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#ifdef NATIVE_ABI
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/*
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* Probe callback function.
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*
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* Note: This function is called for _all_ syscalls, regardless of which sysent
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* array the syscall comes from. It could be a standard syscall or a
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* compat syscall from something like Linux.
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*/
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static void
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systrace_probe(struct syscall_args *sa, enum systrace_probe_t type, int retval)
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{
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uint64_t uargs[nitems(sa->args)];
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dtrace_id_t id;
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int n_args, sysnum;
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sysnum = sa->code;
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memset(uargs, 0, sizeof(uargs));
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if (type == SYSTRACE_ENTRY) {
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if ((id = sa->callp->sy_entry) == DTRACE_IDNONE)
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return;
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if (sa->callp->sy_systrace_args_func != NULL)
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/*
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* Convert the syscall parameters using the registered
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* function.
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*/
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(*sa->callp->sy_systrace_args_func)(sysnum, sa->args,
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uargs, &n_args);
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else
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/*
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* Use the built-in system call argument conversion
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* function to translate the syscall structure fields
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* into the array of 64-bit values that DTrace expects.
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*/
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systrace_args(sysnum, sa->args, uargs, &n_args);
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/*
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* Save probe arguments now so that we can retrieve them if
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* the getargval method is called from further down the stack.
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*/
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curthread->t_dtrace_systrace_args = uargs;
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} else {
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if ((id = sa->callp->sy_return) == DTRACE_IDNONE)
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return;
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curthread->t_dtrace_systrace_args = NULL;
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/* Set arg0 and arg1 as the return value of this syscall. */
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uargs[0] = uargs[1] = retval;
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}
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/* Process the probe using the converted argments. */
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dtrace_probe(id, uargs[0], uargs[1], uargs[2], uargs[3], uargs[4]);
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}
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#endif
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static void
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systrace_getargdesc(void *arg, dtrace_id_t id, void *parg,
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dtrace_argdesc_t *desc)
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{
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int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
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if (SYSTRACE_ISENTRY((uintptr_t)parg))
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systrace_entry_setargdesc(sysnum, desc->dtargd_ndx,
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desc->dtargd_native, sizeof(desc->dtargd_native));
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else
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systrace_return_setargdesc(sysnum, desc->dtargd_ndx,
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desc->dtargd_native, sizeof(desc->dtargd_native));
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if (desc->dtargd_native[0] == '\0')
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desc->dtargd_ndx = DTRACE_ARGNONE;
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}
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static uint64_t
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systrace_getargval(void *arg __unused, dtrace_id_t id __unused,
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void *parg __unused, int argno, int aframes __unused)
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{
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uint64_t *uargs;
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uargs = curthread->t_dtrace_systrace_args;
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if (uargs == NULL)
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/* This is a return probe. */
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return (0);
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if (argno >= nitems(((struct syscall_args *)NULL)->args))
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return (0);
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return (uargs[argno]);
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}
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static void
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systrace_provide(void *arg, dtrace_probedesc_t *desc)
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{
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int i;
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if (desc != NULL)
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return;
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for (i = 0; i < MAXSYSCALL; i++) {
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if (dtrace_probe_lookup(systrace_id, MODNAME,
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uglyhack.pp_syscallnames[i], "entry") != 0)
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continue;
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(void)dtrace_probe_create(systrace_id, MODNAME,
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uglyhack.pp_syscallnames[i], "entry",
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SYSTRACE_ARTIFICIAL_FRAMES,
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(void *)((uintptr_t)SYSTRACE_ENTRY(i)));
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(void)dtrace_probe_create(systrace_id, MODNAME,
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uglyhack.pp_syscallnames[i], "return",
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SYSTRACE_ARTIFICIAL_FRAMES,
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(void *)((uintptr_t)SYSTRACE_RETURN(i)));
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}
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}
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static void
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systrace_destroy(void *arg, dtrace_id_t id, void *parg)
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{
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#ifdef DEBUG
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int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
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/*
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* There's nothing to do here but assert that we have actually been
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* disabled.
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*/
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if (SYSTRACE_ISENTRY((uintptr_t)parg)) {
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ASSERT(sysent[sysnum].sy_entry == 0);
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} else {
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ASSERT(sysent[sysnum].sy_return == 0);
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}
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#endif
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}
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static void
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systrace_enable(void *arg, dtrace_id_t id, void *parg)
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{
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int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
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if (SYSENT[sysnum].sy_systrace_args_func == NULL)
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SYSENT[sysnum].sy_systrace_args_func = systrace_args;
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if (SYSTRACE_ISENTRY((uintptr_t)parg))
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SYSENT[sysnum].sy_entry = id;
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else
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SYSENT[sysnum].sy_return = id;
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}
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static void
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systrace_disable(void *arg, dtrace_id_t id, void *parg)
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{
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int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
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SYSENT[sysnum].sy_entry = 0;
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SYSENT[sysnum].sy_return = 0;
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}
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static void
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systrace_load(void *dummy __unused)
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{
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if (dtrace_register(PROVNAME, &systrace_attr, DTRACE_PRIV_USER, NULL,
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&systrace_pops, NULL, &systrace_id) != 0)
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return;
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#ifdef NATIVE_ABI
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systrace_probe_func = systrace_probe;
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#endif
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}
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static void
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systrace_unload(void *dummy __unused)
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{
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#ifdef NATIVE_ABI
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systrace_probe_func = NULL;
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#endif
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if (dtrace_unregister(systrace_id) != 0)
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return;
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}
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static int
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systrace_modevent(module_t mod __unused, int type, void *data __unused)
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{
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int error;
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error = 0;
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switch (type) {
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case MOD_LOAD:
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break;
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case MOD_UNLOAD:
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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SYSINIT(systrace_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY,
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systrace_load, NULL);
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SYSUNINIT(systrace_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY,
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systrace_unload, NULL);
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#ifdef LINUX_SYSTRACE
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DEV_MODULE(systrace_linux, systrace_modevent, NULL);
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MODULE_VERSION(systrace_linux, 1);
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#ifdef __amd64__
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MODULE_DEPEND(systrace_linux, linux64, 1, 1, 1);
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#else
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MODULE_DEPEND(systrace_linux, linux, 1, 1, 1);
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#endif
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MODULE_DEPEND(systrace_linux, dtrace, 1, 1, 1);
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MODULE_DEPEND(systrace_linux, opensolaris, 1, 1, 1);
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#elif defined(LINUX32_SYSTRACE)
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DEV_MODULE(systrace_linux32, systrace_modevent, NULL);
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MODULE_VERSION(systrace_linux32, 1);
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MODULE_DEPEND(systrace_linux32, linux, 1, 1, 1);
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MODULE_DEPEND(systrace_linux32, dtrace, 1, 1, 1);
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MODULE_DEPEND(systrace_linux32, opensolaris, 1, 1, 1);
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#elif defined(FREEBSD32_SYSTRACE)
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DEV_MODULE(systrace_freebsd32, systrace_modevent, NULL);
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MODULE_VERSION(systrace_freebsd32, 1);
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MODULE_DEPEND(systrace_freebsd32, dtrace, 1, 1, 1);
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MODULE_DEPEND(systrace_freebsd32, opensolaris, 1, 1, 1);
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#else
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DEV_MODULE(systrace, systrace_modevent, NULL);
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MODULE_VERSION(systrace, 1);
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MODULE_DEPEND(systrace, dtrace, 1, 1, 1);
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MODULE_DEPEND(systrace, opensolaris, 1, 1, 1);
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#endif
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